Config(3) Perl Programmers Reference Guide Config(3)
NAME
Config - access Perl configuration information
SYNOPSIS
use Config;
if ($Config{usethreads}) {
print "has thread support\n"
}
use Config qw(myconfig config_sh config_vars config_re);
print myconfig();
print config_sh();
print config_re();
config_vars(qw(osname archname));
DESCRIPTION
The Config module contains all the information that was available to the "Configure" pro-
gram at Perl build time (over 900 values).
Shell variables from the config.sh file (written by Configure) are stored in the readonly-
variable %Config, indexed by their names.
Values stored in config.sh as 'undef' are returned as undefined values. The perl "exists"
function can be used to check if a named variable exists.
myconfig()
Returns a textual summary of the major perl configuration values. See also "-V" in
"Switches" in perlrun.
config_sh()
Returns the entire perl configuration information in the form of the original con-
fig.sh shell variable assignment script.
config_re($regex)
Like config_sh() but returns, as a list, only the config entries who's names match the
$regex.
config_vars(@names)
Prints to STDOUT the values of the named configuration variable. Each is printed on a
separate line in the form:
name='value';
Names which are unknown are output as "name='UNKNOWN';". See also "-V:name" in
"Switches" in perlrun.
EXAMPLE
Here's a more sophisticated example of using %Config:
use Config;
use strict;
my %sig_num;
my @sig_name;
unless($Config{sig_name} && $Config{sig_num}) {
die "No sigs?";
} else {
my @names = split ' ', $Config{sig_name};
@sig_num{@names} = split ' ', $Config{sig_num};
foreach (@names) {
$sig_name[$sig_num{$_}] ||= $_;
}
}
print "signal #17 = $sig_name[17]\n";
if ($sig_num{ALRM}) {
print "SIGALRM is $sig_num{ALRM}\n";
}
WARNING
Because this information is not stored within the perl executable itself it is possible
(but unlikely) that the information does not relate to the actual perl binary which is
being used to access it.
The Config module is installed into the architecture and version specific library direc-
tory ($Config{installarchlib}) and it checks the perl version number when loaded.
The values stored in config.sh may be either single-quoted or double-quoted. Double-quoted
strings are handy for those cases where you need to include escape sequences in the
strings. To avoid runtime variable interpolation, any "$" and "@" characters are replaced
by "\$" and "\@", respectively. This isn't foolproof, of course, so don't embed "\$" or
"\@" in double-quoted strings unless you're willing to deal with the consequences. (The
slashes will end up escaped and the "$" or "@" will trigger variable interpolation)
GLOSSARY
Most "Config" variables are determined by the "Configure" script on platforms supported by
it (which is most UNIX platforms). Some platforms have custom-made "Config" variables,
and may thus not have some of the variables described below, or may have extraneous vari-
ables specific to that particular port. See the port specific documentation in such
cases.
_
"_a"
From Unix.U:
This variable defines the extension used for ordinary library files. For unix, it is
.a. The . is included. Other possible values include .lib.
"_exe"
From Unix.U:
This variable defines the extension used for executable files. "DJGPP", Cygwin and
OS/2 use .exe. Stratus "VOS" uses .pm. On operating systems which do not require a
specific extension for executable files, this variable is empty.
"_o"
From Unix.U:
This variable defines the extension used for object files. For unix, it is .o. The .
is included. Other possible values include .obj.
a
"afs"
From afs.U:
This variable is set to "true" if "AFS" (Andrew File System) is used on the system,
"false" otherwise. It is possible to override this with a hint value or command line
option, but you'd better know what you are doing.
"afsroot"
From afs.U:
This variable is by default set to /afs. In the unlikely case this is not the correct
root, it is possible to override this with a hint value or command line option. This
will be used in subsequent tests for AFSness in the Perl configure and test process.
"alignbytes"
From alignbytes.U:
This variable holds the number of bytes required to align a double-- or a long double
when applicable. Usual values are 2, 4 and 8. The default is eight, for safety.
"ansi2knr"
From ansi2knr.U:
This variable is set if the user needs to run ansi2knr. Currently, this is not sup-
ported, so we just abort.
"aphostname"
From d_gethname.U:
This variable contains the command which can be used to compute the host name. The
command is fully qualified by its absolute path, to make it safe when used by a pro-
cess with super-user privileges.
"api_revision"
From patchlevel.U:
The three variables, api_revision, api_version, and api_subversion, specify the ver-
sion of the oldest perl binary compatible with the present perl. In a full version
string such as 5.6.1, api_revision is the 5. Prior to 5.5.640, the format was a
floating point number, like 5.00563.
perl.c:incpush() and lib/lib.pm will automatically search in $sitelib/.. for older
directories back to the limit specified by these api_ variables. This is only useful
if you have a perl library directory tree structured like the default one. See
"INSTALL" for how this works. The versioned site_perl directory was introduced in
5.005, so that is the lowest possible value. The version list appropriate for the
current system is determined in inc_version_list.U.
"XXX" To do: Since compatibility can depend on compile time options (such as bincom-
pat, longlong, etc.) it should (perhaps) be set by Configure, but currently it isn't.
Currently, we read a hard-wired value from patchlevel.h. Perhaps what we ought to do
is take the hard-wired value from patchlevel.h but then modify it if the current Con-
figure options warrant. patchlevel.h then would use an #ifdef guard.
"api_subversion"
From patchlevel.U:
The three variables, api_revision, api_version, and api_subversion, specify the ver-
sion of the oldest perl binary compatible with the present perl. In a full version
string such as 5.6.1, api_subversion is the 1. See api_revision for full details.
"api_version"
From patchlevel.U:
The three variables, api_revision, api_version, and api_subversion, specify the ver-
sion of the oldest perl binary compatible with the present perl. In a full version
string such as 5.6.1, api_version is the 6. See api_revision for full details. As a
special case, 5.5.0 is rendered in the old-style as 5.005. (In the 5.005_0x mainte-
nance series, this was the only versioned directory in $sitelib.)
"api_versionstring"
From patchlevel.U:
This variable combines api_revision, api_version, and api_subversion in a format such
as 5.6.1 (or 5_6_1) suitable for use as a directory name. This is filesystem depen-
dent.
"ar"
From Loc.U:
This variable is used internally by Configure to determine the full pathname (if any)
of the ar program. After Configure runs, the value is reset to a plain "ar" and is
not useful.
"archlib"
From archlib.U:
This variable holds the name of the directory in which the user wants to put architec-
ture-dependent public library files for $package. It is most often a local directory
such as /usr/local/lib. Programs using this variable must be prepared to deal with
filename expansion.
"archlibexp"
From archlib.U:
This variable is the same as the archlib variable, but is filename expanded at config-
uration time, for convenient use.
"archname64"
From use64bits.U:
This variable is used for the 64-bitness part of $archname.
"archname"
From archname.U:
This variable is a short name to characterize the current architecture. It is used
mainly to construct the default archlib.
"archobjs"
From Unix.U:
This variable defines any additional objects that must be linked in with the program
on this architecture. On unix, it is usually empty. It is typically used to include
emulations of unix calls or other facilities. For perl on OS/2, for example, this
would include os2/os2.obj.
"asctime_r_proto"
From d_asctime_r.U:
This variable encodes the prototype of asctime_r. It is zero if d_asctime_r is undef,
and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_asctime_r is defined.
"awk"
From Loc.U:
This variable is used internally by Configure to determine the full pathname (if any)
of the awk program. After Configure runs, the value is reset to a plain "awk" and is
not useful.
b
"baserev"
From baserev.U:
The base revision level of this package, from the .package file.
"bash"
From Loc.U:
This variable is defined but not used by Configure. The value is a plain '' and is
not useful.
"bin"
From bin.U:
This variable holds the name of the directory in which the user wants to put publicly
executable images for the package in question. It is most often a local directory
such as /usr/local/bin. Programs using this variable must be prepared to deal with
~name substitution.
"binexp"
From bin.U:
This is the same as the bin variable, but is filename expanded at configuration time,
for use in your makefiles.
"bison"
From Loc.U:
This variable is used internally by Configure to determine the full pathname (if any)
of the bison program. After Configure runs, the value is reset to a plain "bison" and
is not useful.
"byacc"
From Loc.U:
This variable is used internally by Configure to determine the full pathname (if any)
of the byacc program. After Configure runs, the value is reset to a plain "byacc" and
is not useful.
"byteorder"
From byteorder.U:
This variable holds the byte order in a "UV". In the following, larger digits indicate
more significance. The variable byteorder is either 4321 on a big-endian machine, or
1234 on a little-endian, or 87654321 on a Cray ... or 3412 with weird order !
c
"c" From n.U:
This variable contains the \c string if that is what causes the echo command to sup-
press newline. Otherwise it is null. Correct usage is $echo $n "prompt for a ques-
tion: $c".
"castflags"
From d_castneg.U:
This variable contains a flag that precise difficulties the compiler has casting odd
floating values to unsigned long: 0 = ok 1 = couldn't cast < 0 2 = couldn't cast >=
0x80000000 4 = couldn't cast in argument expression list
"cat"
From Loc.U:
This variable is used internally by Configure to determine the full pathname (if any)
of the cat program. After Configure runs, the value is reset to a plain "cat" and is
not useful.
"cc"
From cc.U:
This variable holds the name of a command to execute a C compiler which can resolve
multiple global references that happen to have the same name. Usual values are "cc"
and "gcc". Fervent "ANSI" compilers may be called "c89". "AIX" has xlc.
"cccdlflags"
From dlsrc.U:
This variable contains any special flags that might need to be passed with "cc -c" to
compile modules to be used to create a shared library that will be used for dynamic
loading. For hpux, this should be +z. It is up to the makefile to use it.
"ccdlflags"
From dlsrc.U:
This variable contains any special flags that might need to be passed to cc to link
with a shared library for dynamic loading. It is up to the makefile to use it. For
sunos 4.1, it should be empty.
"ccflags"
From ccflags.U:
This variable contains any additional C compiler flags desired by the user. It is up
to the Makefile to use this.
"ccflags_uselargefiles"
From uselfs.U:
This variable contains the compiler flags needed by large file builds and added to
ccflags by hints files.
"ccname"
From Checkcc.U:
This can set either by hints files or by Configure. If using gcc, this is gcc, and if
not, usually equal to cc, unimpressive, no? Some platforms, however, make good use of
this by storing the flavor of the C compiler being used here. For example if using
the Sun WorkShop suite, ccname will be "workshop".
"ccsymbols"
From Cppsym.U:
The variable contains the symbols defined by the C compiler alone. The symbols
defined by cpp or by cc when it calls cpp are not in this list, see cppsymbols and
cppccsymbols. The list is a space-separated list of symbol=value tokens.
"ccversion"
From Checkcc.U:
This can set either by hints files or by Configure. If using a (non-gcc) vendor cc,
this variable may contain a version for the compiler.
"cf_by"
From cf_who.U:
Login name of the person who ran the Configure script and answered the questions. This
is used to tag both config.sh and config_h.SH.
"cf_email"
From cf_email.U:
Electronic mail address of the person who ran Configure. This can be used by units
that require the user's e-mail, like MailList.U.
"cf_time"
From cf_who.U:
Holds the output of the "date" command when the configuration file was produced. This
is used to tag both config.sh and config_h.SH.
"charsize"
From charsize.U:
This variable contains the value of the "CHARSIZE" symbol, which indicates to the C
program how many bytes there are in a character.
"chgrp"
From Loc.U:
This variable is defined but not used by Configure. The value is a plain '' and is
not useful.
"chmod"
From Loc.U:
This variable is used internally by Configure to determine the full pathname (if any)
of the chmod program. After Configure runs, the value is reset to a plain "chmod" and
is not useful.
"chown"
From Loc.U:
This variable is defined but not used by Configure. The value is a plain '' and is
not useful.
"clocktype"
From d_times.U:
This variable holds the type returned by times(). It can be long, or clock_t on "BSD"
sites (in which case should be included).
"comm"
From Loc.U:
This variable is used internally by Configure to determine the full pathname (if any)
of the comm program. After Configure runs, the value is reset to a plain "comm" and
is not useful.
"compress"
From Loc.U:
This variable is defined but not used by Configure. The value is a plain '' and is
not useful.
"contains"
From contains.U:
This variable holds the command to do a grep with a proper return status. On most
sane systems it is simply "grep". On insane systems it is a grep followed by a cat
followed by a test. This variable is primarily for the use of other Configure units.
"cp"
From Loc.U:
This variable is used internally by Configure to determine the full pathname (if any)
of the cp program. After Configure runs, the value is reset to a plain "cp" and is
not useful.
"cpio"
From Loc.U:
This variable is defined but not used by Configure. The value is a plain '' and is
not useful.
"cpp"
From Loc.U:
This variable is used internally by Configure to determine the full pathname (if any)
of the cpp program. After Configure runs, the value is reset to a plain "cpp" and is
not useful.
"cpp_stuff"
From cpp_stuff.U:
This variable contains an identification of the concatenation mechanism used by the C
preprocessor.
"cppccsymbols"
From Cppsym.U:
The variable contains the symbols defined by the C compiler when it calls cpp. The
symbols defined by the cc alone or cpp alone are not in this list, see ccsymbols and
cppsymbols. The list is a space-separated list of symbol=value tokens.
"cppflags"
From ccflags.U:
This variable holds the flags that will be passed to the C pre- processor. It is up to
the Makefile to use it.
"cpplast"
From cppstdin.U:
This variable has the same functionality as cppminus, only it applies to cpprun and
not cppstdin.
"cppminus"
From cppstdin.U:
This variable contains the second part of the string which will invoke the C prepro-
cessor on the standard input and produce to standard output. This variable will have
the value "-" if cppstdin needs a minus to specify standard input, otherwise the value
is "".
"cpprun"
From cppstdin.U:
This variable contains the command which will invoke a C preprocessor on standard
input and put the output to stdout. It is guaranteed not to be a wrapper and may be a
null string if no preprocessor can be made directly available. This preprocessor might
be different from the one used by the C compiler. Don't forget to append cpplast after
the preprocessor options.
"cppstdin"
From cppstdin.U:
This variable contains the command which will invoke the C preprocessor on standard
input and put the output to stdout. It is primarily used by other Configure units
that ask about preprocessor symbols.
"cppsymbols"
From Cppsym.U:
The variable contains the symbols defined by the C preprocessor alone. The symbols
defined by cc or by cc when it calls cpp are not in this list, see ccsymbols and
cppccsymbols. The list is a space-separated list of symbol=value tokens.
"crypt_r_proto"
From d_crypt_r.U:
This variable encodes the prototype of crypt_r. It is zero if d_crypt_r is undef, and
one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_crypt_r is defined.
"cryptlib"
From d_crypt.U:
This variable holds -lcrypt or the path to a libcrypt.a archive if the crypt() func-
tion is not defined in the standard C library. It is up to the Makefile to use this.
"csh"
From Loc.U:
This variable is used internally by Configure to determine the full pathname (if any)
of the csh program. After Configure runs, the value is reset to a plain "csh" and is
not useful.
"ctermid_r_proto"
From d_ctermid_r.U:
This variable encodes the prototype of ctermid_r. It is zero if d_ctermid_r is undef,
and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_ctermid_r is defined.
"ctime_r_proto"
From d_ctime_r.U:
This variable encodes the prototype of ctime_r. It is zero if d_ctime_r is undef, and
one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_ctime_r is defined.
d
"d__fwalk"
From d__fwalk.U:
This variable conditionally defines "HAS__FWALK" if _fwalk() is available to apply a
function to all the file handles.
"d_access"
From d_access.U:
This variable conditionally defines "HAS_ACCESS" if the access() system call is avail-
able to check for access permissions using real IDs.
"d_accessx"
From d_accessx.U:
This variable conditionally defines the "HAS_ACCESSX" symbol, which indicates to the C
program that the accessx() routine is available.
"d_aintl"
From d_aintl.U:
This variable conditionally defines the "HAS_AINTL" symbol, which indicates to the C
program that the aintl() routine is available. If copysignl is also present we can
emulate modfl.
"d_alarm"
From d_alarm.U:
This variable conditionally defines the "HAS_ALARM" symbol, which indicates to the C
program that the alarm() routine is available.
"d_archlib"
From archlib.U:
This variable conditionally defines "ARCHLIB" to hold the pathname of architecture-
dependent library files for $package. If $archlib is the same as $privlib, then this
is set to undef.
"d_asctime_r"
From d_asctime_r.U:
This variable conditionally defines the "HAS_ASCTIME_R" symbol, which indicates to the
C program that the asctime_r() routine is available.
"d_atolf"
From atolf.U:
This variable conditionally defines the "HAS_ATOLF" symbol, which indicates to the C
program that the atolf() routine is available.
"d_atoll"
From atoll.U:
This variable conditionally defines the "HAS_ATOLL" symbol, which indicates to the C
program that the atoll() routine is available.
"d_attribute_format"
From d_attribut_format.U:
This variable conditionally defines "HASATTRIBUTE_FORMAT", which indicates the C com-
piler can check for printf-like formats.
"d_attribute_malloc"
From d_attribute_malloc.U:
This variable conditionally defines "HASATTRIBUTE_MALLOC", which indicates the C com-
piler can understand functions as having malloc-like semantics.
"d_attribute_nonnull"
From d_attribute_nonnull.U:
This variable conditionally defines "HASATTRIBUTE_NONNULL", which indicates that the C
compiler can know that certain arguments must not be "NULL", and will check accord-
ingly at compile time.
"d_attribute_noreturn"
From d_attribute_noreturn.U:
This variable conditionally defines "HASATTRIBUTE_NORETURN", which indicates that the
C compiler can know that certain functions are guaranteed never to return.
"d_attribute_pure"
From d_attribute_pure.U:
This variable conditionally defines "HASATTRIBUTE_PURE", which indicates that the C
compiler can know that certain functions are "pure" functions, meaning that they have
no side effects, and only rely on function input and/or global data for their results.
"d_attribute_unused"
From d_attribute_unused.U:
This variable conditionally defines "HASATTRIBUTE_UNUSED", which indicates that the C
compiler can know that certain variables and arguments may not always be used, and to
not throw warnings if they don't get used.
"d_attribute_warn_unused_result"
From d_attribute_warn_unused_result.U:
This variable conditionally defines "HASATTRIBUTE_WARN_UNUSED_RESULT", which indicates
that the C compiler can know that certain functions have a return values that must not
be ignored, such as malloc() or open().
"d_bcmp"
From d_bcmp.U:
This variable conditionally defines the "HAS_BCMP" symbol if the bcmp() routine is
available to compare strings.
"d_bcopy"
From d_bcopy.U:
This variable conditionally defines the "HAS_BCOPY" symbol if the bcopy() routine is
available to copy strings.
"d_bsd"
From Guess.U:
This symbol conditionally defines the symbol "BSD" when running on a "BSD" system.
"d_bsdgetpgrp"
From d_getpgrp.U:
This variable conditionally defines "USE_BSD_GETPGRP" if getpgrp needs one arguments
whereas "USG" one needs none.
"d_bsdsetpgrp"
From d_setpgrp.U:
This variable conditionally defines "USE_BSD_SETPGRP" if setpgrp needs two arguments
whereas "USG" one needs none. See also d_setpgid for a "POSIX" interface.
"d_bzero"
From d_bzero.U:
This variable conditionally defines the "HAS_BZERO" symbol if the bzero() routine is
available to set memory to 0.
"d_casti32"
From d_casti32.U:
This variable conditionally defines CASTI32, which indicates whether the C compiler
can cast large floats to 32-bit ints.
"d_castneg"
From d_castneg.U:
This variable conditionally defines "CASTNEG", which indicates wether the C compiler
can cast negative float to unsigned.
"d_charvspr"
From d_vprintf.U:
This variable conditionally defines "CHARVSPRINTF" if this system has vsprintf return-
ing type (char*). The trend seems to be to declare it as "int vsprintf()".
"d_chown"
From d_chown.U:
This variable conditionally defines the "HAS_CHOWN" symbol, which indicates to the C
program that the chown() routine is available.
"d_chroot"
From d_chroot.U:
This variable conditionally defines the "HAS_CHROOT" symbol, which indicates to the C
program that the chroot() routine is available.
"d_chsize"
From d_chsize.U:
This variable conditionally defines the "CHSIZE" symbol, which indicates to the C pro-
gram that the chsize() routine is available to truncate files. You might need a -lx
to get this routine.
"d_class"
From d_class.U:
This variable conditionally defines the "HAS_CLASS" symbol, which indicates to the C
program that the class() routine is available.
"d_clearenv"
From d_clearenv.U:
This variable conditionally defines the "HAS_CLEARENV" symbol, which indicates to the
C program that the clearenv () routine is available.
"d_closedir"
From d_closedir.U:
This variable conditionally defines "HAS_CLOSEDIR" if closedir() is available.
"d_cmsghdr_s"
From d_cmsghdr_s.U:
This variable conditionally defines the "HAS_STRUCT_CMSGHDR" symbol, which indicates
that the struct cmsghdr is supported.
"d_const"
From d_const.U:
This variable conditionally defines the "HASCONST" symbol, which indicates to the C
program that this C compiler knows about the const type.
"d_copysignl"
From d_copysignl.U:
This variable conditionally defines the "HAS_COPYSIGNL" symbol, which indicates to the
C program that the copysignl() routine is available. If aintl is also present we can
emulate modfl.
"d_crypt"
From d_crypt.U:
This variable conditionally defines the "CRYPT" symbol, which indicates to the C pro-
gram that the crypt() routine is available to encrypt passwords and the like.
"d_crypt_r"
From d_crypt_r.U:
This variable conditionally defines the "HAS_CRYPT_R" symbol, which indicates to the C
program that the crypt_r() routine is available.
"d_csh"
From d_csh.U:
This variable conditionally defines the "CSH" symbol, which indicates to the C program
that the C-shell exists.
"d_ctermid_r"
From d_ctermid_r.U:
This variable conditionally defines the "HAS_CTERMID_R" symbol, which indicates to the
C program that the ctermid_r() routine is available.
"d_ctime_r"
From d_ctime_r.U:
This variable conditionally defines the "HAS_CTIME_R" symbol, which indicates to the C
program that the ctime_r() routine is available.
"d_cuserid"
From d_cuserid.U:
This variable conditionally defines the "HAS_CUSERID" symbol, which indicates to the C
program that the cuserid() routine is available to get character login names.
"d_dbl_dig"
From d_dbl_dig.U:
This variable conditionally defines d_dbl_dig if this system's header files provide
"DBL_DIG", which is the number of significant digits in a double precision number.
"d_dbminitproto"
From d_dbminitproto.U:
This variable conditionally defines the "HAS_DBMINIT_PROTO" symbol, which indicates to
the C program that the system provides a prototype for the dbminit() function. Other-
wise, it is up to the program to supply one.
"d_difftime"
From d_difftime.U:
This variable conditionally defines the "HAS_DIFFTIME" symbol, which indicates to the
C program that the difftime() routine is available.
"d_dirfd"
From d_dirfd.U:
This variable conditionally defines the "HAS_DIRFD" constant, which indicates to the C
program that dirfd() is available to return the file descriptor of a directory stream.
"d_dirnamlen"
From i_dirent.U:
This variable conditionally defines "DIRNAMLEN", which indicates to the C program that
the length of directory entry names is provided by a d_namelen field.
"d_dlerror"
From d_dlerror.U:
This variable conditionally defines the "HAS_DLERROR" symbol, which indicates to the C
program that the dlerror() routine is available.
"d_dlopen"
From d_dlopen.U:
This variable conditionally defines the "HAS_DLOPEN" symbol, which indicates to the C
program that the dlopen() routine is available.
"d_dlsymun"
From d_dlsymun.U:
This variable conditionally defines "DLSYM_NEEDS_UNDERSCORE", which indicates that we
need to prepend an underscore to the symbol name before calling dlsym().
"d_dosuid"
From d_dosuid.U:
This variable conditionally defines the symbol "DOSUID", which tells the C program
that it should insert setuid emulation code on hosts which have setuid #! scripts dis-
abled.
"d_drand48_r"
From d_drand48_r.U:
This variable conditionally defines the HAS_DRAND48_R symbol, which indicates to the C
program that the drand48_r() routine is available.
"d_drand48proto"
From d_drand48proto.U:
This variable conditionally defines the HAS_DRAND48_PROTO symbol, which indicates to
the C program that the system provides a prototype for the drand48() function. Other-
wise, it is up to the program to supply one.
"d_dup2"
From d_dup2.U:
This variable conditionally defines HAS_DUP2 if dup2() is available to duplicate file
descriptors.
"d_eaccess"
From d_eaccess.U:
This variable conditionally defines the "HAS_EACCESS" symbol, which indicates to the C
program that the eaccess() routine is available.
"d_endgrent"
From d_endgrent.U:
This variable conditionally defines the "HAS_ENDGRENT" symbol, which indicates to the
C program that the endgrent() routine is available for sequential access of the group
database.
"d_endgrent_r"
From d_endgrent_r.U:
This variable conditionally defines the "HAS_ENDGRENT_R" symbol, which indicates to
the C program that the endgrent_r() routine is available.
"d_endhent"
From d_endhent.U:
This variable conditionally defines "HAS_ENDHOSTENT" if endhostent() is available to
close whatever was being used for host queries.
"d_endhostent_r"
From d_endhostent_r.U:
This variable conditionally defines the "HAS_ENDHOSTENT_R" symbol, which indicates to
the C program that the endhostent_r() routine is available.
"d_endnent"
From d_endnent.U:
This variable conditionally defines "HAS_ENDNETENT" if endnetent() is available to
close whatever was being used for network queries.
"d_endnetent_r"
From d_endnetent_r.U:
This variable conditionally defines the "HAS_ENDNETENT_R" symbol, which indicates to
the C program that the endnetent_r() routine is available.
"d_endpent"
From d_endpent.U:
This variable conditionally defines "HAS_ENDPROTOENT" if endprotoent() is available to
close whatever was being used for protocol queries.
"d_endprotoent_r"
From d_endprotoent_r.U:
This variable conditionally defines the "HAS_ENDPROTOENT_R" symbol, which indicates to
the C program that the endprotoent_r() routine is available.
"d_endpwent"
From d_endpwent.U:
This variable conditionally defines the "HAS_ENDPWENT" symbol, which indicates to the
C program that the endpwent() routine is available for sequential access of the passwd
database.
"d_endpwent_r"
From d_endpwent_r.U:
This variable conditionally defines the "HAS_ENDPWENT_R" symbol, which indicates to
the C program that the endpwent_r() routine is available.
"d_endsent"
From d_endsent.U:
This variable conditionally defines "HAS_ENDSERVENT" if endservent() is available to
close whatever was being used for service queries.
"d_endservent_r"
From d_endservent_r.U:
This variable conditionally defines the "HAS_ENDSERVENT_R" symbol, which indicates to
the C program that the endservent_r() routine is available.
"d_eofnblk"
From nblock_io.U:
This variable conditionally defines "EOF_NONBLOCK" if "EOF" can be seen when reading
from a non-blocking I/O source.
"d_eunice"
From Guess.U:
This variable conditionally defines the symbols "EUNICE" and "VAX", which alerts the C
program that it must deal with ideosyncracies of "VMS".
"d_faststdio"
From d_faststdio.U:
This variable conditionally defines the "HAS_FAST_STDIO" symbol, which indicates to
the C program that the "fast stdio" is available to manipulate the stdio buffers
directly.
"d_fchdir"
From d_fchdir.U:
This variable conditionally defines the "HAS_FCHDIR" symbol, which indicates to the C
program that the fchdir() routine is available.
"d_fchmod"
From d_fchmod.U:
This variable conditionally defines the "HAS_FCHMOD" symbol, which indicates to the C
program that the fchmod() routine is available to change mode of opened files.
"d_fchown"
From d_fchown.U:
This variable conditionally defines the "HAS_FCHOWN" symbol, which indicates to the C
program that the fchown() routine is available to change ownership of opened files.
"d_fcntl"
From d_fcntl.U:
This variable conditionally defines the "HAS_FCNTL" symbol, and indicates whether the
fcntl() function exists
"d_fcntl_can_lock"
From d_fcntl_can_lock.U:
This variable conditionally defines the "FCNTL_CAN_LOCK" symbol and indicates whether
file locking with fcntl() works.
"d_fd_macros"
From d_fd_set.U:
This variable contains the eventual value of the "HAS_FD_MACROS" symbol, which indi-
cates if your C compiler knows about the macros which manipulate an fd_set.
"d_fd_set"
From d_fd_set.U:
This variable contains the eventual value of the "HAS_FD_SET" symbol, which indicates
if your C compiler knows about the fd_set typedef.
"d_fds_bits"
From d_fd_set.U:
This variable contains the eventual value of the "HAS_FDS_BITS" symbol, which indi-
cates if your fd_set typedef contains the fds_bits member. If you have an fd_set
typedef, but the dweebs who installed it did a half-fast job and neglected to provide
the macros to manipulate an fd_set, "HAS_FDS_BITS" will let us know how to fix the
gaffe.
"d_fgetpos"
From d_fgetpos.U:
This variable conditionally defines "HAS_FGETPOS" if fgetpos() is available to get the
file position indicator.
"d_finite"
From d_finite.U:
This variable conditionally defines the "HAS_FINITE" symbol, which indicates to the C
program that the finite() routine is available.
"d_finitel"
From d_finitel.U:
This variable conditionally defines the "HAS_FINITEL" symbol, which indicates to the C
program that the finitel() routine is available.
"d_flexfnam"
From d_flexfnam.U:
This variable conditionally defines the "FLEXFILENAMES" symbol, which indicates that
the system supports filenames longer than 14 characters.
"d_flock"
From d_flock.U:
This variable conditionally defines "HAS_FLOCK" if flock() is available to do file
locking.
"d_flockproto"
From d_flockproto.U:
This variable conditionally defines the "HAS_FLOCK_PROTO" symbol, which indicates to
the C program that the system provides a prototype for the flock() function. Other-
wise, it is up to the program to supply one.
"d_fork"
From d_fork.U:
This variable conditionally defines the "HAS_FORK" symbol, which indicates to the C
program that the fork() routine is available.
"d_fp_class"
From d_fp_class.U:
This variable conditionally defines the "HAS_FP_CLASS" symbol, which indicates to the
C program that the fp_class() routine is available.
"d_fpathconf"
From d_pathconf.U:
This variable conditionally defines the "HAS_FPATHCONF" symbol, which indicates to the
C program that the pathconf() routine is available to determine file-system related
limits and options associated with a given open file descriptor.
"d_fpclass"
From d_fpclass.U:
This variable conditionally defines the "HAS_FPCLASS" symbol, which indicates to the C
program that the fpclass() routine is available.
"d_fpclassify"
From d_fpclassify.U:
This variable conditionally defines the "HAS_FPCLASSIFY" symbol, which indicates to
the C program that the fpclassify() routine is available.
"d_fpclassl"
From d_fpclassl.U:
This variable conditionally defines the "HAS_FPCLASSL" symbol, which indicates to the
C program that the fpclassl() routine is available.
"d_fpos64_t"
From d_fpos64_t.U:
This symbol will be defined if the C compiler supports fpos64_t.
"d_frexpl"
From d_frexpl.U:
This variable conditionally defines the "HAS_FREXPL" symbol, which indicates to the C
program that the frexpl() routine is available.
"d_fs_data_s"
From d_fs_data_s.U:
This variable conditionally defines the "HAS_STRUCT_FS_DATA" symbol, which indicates
that the struct fs_data is supported.
"d_fseeko"
From d_fseeko.U:
This variable conditionally defines the "HAS_FSEEKO" symbol, which indicates to the C
program that the fseeko() routine is available.
"d_fsetpos"
From d_fsetpos.U:
This variable conditionally defines "HAS_FSETPOS" if fsetpos() is available to set the
file position indicator.
"d_fstatfs"
From d_fstatfs.U:
This variable conditionally defines the "HAS_FSTATFS" symbol, which indicates to the C
program that the fstatfs() routine is available.
"d_fstatvfs"
From d_statvfs.U:
This variable conditionally defines the "HAS_FSTATVFS" symbol, which indicates to the
C program that the fstatvfs() routine is available.
"d_fsync"
From d_fsync.U:
This variable conditionally defines the "HAS_FSYNC" symbol, which indicates to the C
program that the fsync() routine is available.
"d_ftello"
From d_ftello.U:
This variable conditionally defines the "HAS_FTELLO" symbol, which indicates to the C
program that the ftello() routine is available.
"d_ftime"
From d_ftime.U:
This variable conditionally defines the "HAS_FTIME" symbol, which indicates that the
ftime() routine exists. The ftime() routine is basically a sub-second accuracy clock.
"d_futimes"
From f_futimes.U:
This variable conditionally defines the "HAS_FUTIMES" symbol, which indicates to the C
program that the futimes() routine is available.
"d_Gconvert"
From d_gconvert.U:
This variable holds what Gconvert is defined as to convert floating point numbers into
strings. By default, Configure sets "this" macro to use the first of gconvert, gcvt,
or sprintf that pass sprintf-%g-like behaviour tests. If perl is using long doubles,
the macro uses the first of the following functions that pass Configure's tests:
qgcvt, sprintf (if Configure knows how to make sprintf format long doubles--see
sPRIgldbl), gconvert, gcvt, and sprintf (casting to double). The gconvert_preference
and gconvert_ld_preference variables can be used to alter Configure's preferences, for
doubles and long doubles, respectively. If present, they contain a space-separated
list of one or more of the above function names in the order they should be tried.
d_Gconvert may be set to override Configure with a platform- specific function. If
this function expects a double, a different value may need to be set by the uselong-
double.cbu call-back unit so that long doubles can be formatted without loss of preci-
sion.
"d_getcwd"
From d_getcwd.U:
This variable conditionally defines the "HAS_GETCWD" symbol, which indicates to the C
program that the getcwd() routine is available to get the current working directory.
"d_getespwnam"
From d_getespwnam.U:
This variable conditionally defines "HAS_GETESPWNAM" if getespwnam() is available to
retrieve enchanced (shadow) password entries by name.
"d_getfsstat"
From d_getfsstat.U:
This variable conditionally defines the "HAS_GETFSSTAT" symbol, which indicates to the
C program that the getfsstat() routine is available.
"d_getgrent"
From d_getgrent.U:
This variable conditionally defines the "HAS_GETGRENT" symbol, which indicates to the
C program that the getgrent() routine is available for sequential access of the group
database.
"d_getgrent_r"
From d_getgrent_r.U:
This variable conditionally defines the "HAS_GETGRENT_R" symbol, which indicates to
the C program that the getgrent_r() routine is available.
"d_getgrgid_r"
From d_getgrgid_r.U:
This variable conditionally defines the "HAS_GETGRGID_R" symbol, which indicates to
the C program that the getgrgid_r() routine is available.
"d_getgrnam_r"
From d_getgrnam_r.U:
This variable conditionally defines the "HAS_GETGRNAM_R" symbol, which indicates to
the C program that the getgrnam_r() routine is available.
"d_getgrps"
From d_getgrps.U:
This variable conditionally defines the "HAS_GETGROUPS" symbol, which indicates to the
C program that the getgroups() routine is available to get the list of process groups.
"d_gethbyaddr"
From d_gethbyad.U:
This variable conditionally defines the "HAS_GETHOSTBYADDR" symbol, which indicates to
the C program that the gethostbyaddr() routine is available to look up hosts by their
"IP" addresses.
"d_gethbyname"
From d_gethbynm.U:
This variable conditionally defines the "HAS_GETHOSTBYNAME" symbol, which indicates to
the C program that the gethostbyname() routine is available to look up host names in
some data base or other.
"d_gethent"
From d_gethent.U:
This variable conditionally defines "HAS_GETHOSTENT" if gethostent() is available to
look up host names in some data base or another.
"d_gethname"
From d_gethname.U:
This variable conditionally defines the "HAS_GETHOSTNAME" symbol, which indicates to
the C program that the gethostname() routine may be used to derive the host name.
"d_gethostbyaddr_r"
From d_gethostbyaddr_r.U:
This variable conditionally defines the "HAS_GETHOSTBYADDR_R" symbol, which indicates
to the C program that the gethostbyaddr_r() routine is available.
"d_gethostbyname_r"
From d_gethostbyname_r.U:
This variable conditionally defines the "HAS_GETHOSTBYNAME_R" symbol, which indicates
to the C program that the gethostbyname_r() routine is available.
"d_gethostent_r"
From d_gethostent_r.U:
This variable conditionally defines the "HAS_GETHOSTENT_R" symbol, which indicates to
the C program that the gethostent_r() routine is available.
"d_gethostprotos"
From d_gethostprotos.U:
This variable conditionally defines the "HAS_GETHOST_PROTOS" symbol, which indicates
to the C program that supplies prototypes for the various gethost*() func-
tions. See also netdbtype.U for probing for various netdb types.
"d_getitimer"
From d_getitimer.U:
This variable conditionally defines the "HAS_GETITIMER" symbol, which indicates to the
C program that the getitimer() routine is available.
"d_getlogin"
From d_getlogin.U:
This variable conditionally defines the "HAS_GETLOGIN" symbol, which indicates to the
C program that the getlogin() routine is available to get the login name.
"d_getlogin_r"
From d_getlogin_r.U:
This variable conditionally defines the "HAS_GETLOGIN_R" symbol, which indicates to
the C program that the getlogin_r() routine is available.
"d_getmnt"
From d_getmnt.U:
This variable conditionally defines the "HAS_GETMNT" symbol, which indicates to the C
program that the getmnt() routine is available to retrieve one or more mount info
blocks by filename.
"d_getmntent"
From d_getmntent.U:
This variable conditionally defines the "HAS_GETMNTENT" symbol, which indicates to the
C program that the getmntent() routine is available to iterate through mounted files
to get their mount info.
"d_getnbyaddr"
From d_getnbyad.U:
This variable conditionally defines the "HAS_GETNETBYADDR" symbol, which indicates to
the C program that the getnetbyaddr() routine is available to look up networks by
their "IP" addresses.
"d_getnbyname"
From d_getnbynm.U:
This variable conditionally defines the "HAS_GETNETBYNAME" symbol, which indicates to
the C program that the getnetbyname() routine is available to look up networks by
their names.
"d_getnent"
From d_getnent.U:
This variable conditionally defines "HAS_GETNETENT" if getnetent() is available to
look up network names in some data base or another.
"d_getnetbyaddr_r"
From d_getnetbyaddr_r.U:
This variable conditionally defines the "HAS_GETNETBYADDR_R" symbol, which indicates
to the C program that the getnetbyaddr_r() routine is available.
"d_getnetbyname_r"
From d_getnetbyname_r.U:
This variable conditionally defines the "HAS_GETNETBYNAME_R" symbol, which indicates
to the C program that the getnetbyname_r() routine is available.
"d_getnetent_r"
From d_getnetent_r.U:
This variable conditionally defines the "HAS_GETNETENT_R" symbol, which indicates to
the C program that the getnetent_r() routine is available.
"d_getnetprotos"
From d_getnetprotos.U:
This variable conditionally defines the "HAS_GETNET_PROTOS" symbol, which indicates to
the C program that supplies prototypes for the various getnet*() functions.
See also netdbtype.U for probing for various netdb types.
"d_getpagsz"
From d_getpagsz.U:
This variable conditionally defines "HAS_GETPAGESIZE" if getpagesize() is available to
get the system page size.
"d_getpbyname"
From d_getprotby.U:
This variable conditionally defines the "HAS_GETPROTOBYNAME" symbol, which indicates
to the C program that the getprotobyname() routine is available to look up protocols
by their name.
"d_getpbynumber"
From d_getprotby.U:
This variable conditionally defines the "HAS_GETPROTOBYNUMBER" symbol, which indicates
to the C program that the getprotobynumber() routine is available to look up protocols
by their number.
"d_getpent"
From d_getpent.U:
This variable conditionally defines "HAS_GETPROTOENT" if getprotoent() is available to
look up protocols in some data base or another.
"d_getpgid"
From d_getpgid.U:
This variable conditionally defines the "HAS_GETPGID" symbol, which indicates to the C
program that the getpgid(pid) function is available to get the process group id.
"d_getpgrp2"
From d_getpgrp2.U:
This variable conditionally defines the HAS_GETPGRP2 symbol, which indicates to the C
program that the getpgrp2() (as in DG/"UX") routine is available to get the current
process group.
"d_getpgrp"
From d_getpgrp.U:
This variable conditionally defines "HAS_GETPGRP" if getpgrp() is available to get the
current process group.
"d_getppid"
From d_getppid.U:
This variable conditionally defines the "HAS_GETPPID" symbol, which indicates to the C
program that the getppid() routine is available to get the parent process "ID".
"d_getprior"
From d_getprior.U:
This variable conditionally defines "HAS_GETPRIORITY" if getpriority() is available to
get a process's priority.
"d_getprotobyname_r"
From d_getprotobyname_r.U:
This variable conditionally defines the "HAS_GETPROTOBYNAME_R" symbol, which indicates
to the C program that the getprotobyname_r() routine is available.
"d_getprotobynumber_r"
From d_getprotobynumber_r.U:
This variable conditionally defines the "HAS_GETPROTOBYNUMBER_R" symbol, which indi-
cates to the C program that the getprotobynumber_r() routine is available.
"d_getprotoent_r"
From d_getprotoent_r.U:
This variable conditionally defines the "HAS_GETPROTOENT_R" symbol, which indicates to
the C program that the getprotoent_r() routine is available.
"d_getprotoprotos"
From d_getprotoprotos.U:
This variable conditionally defines the "HAS_GETPROTO_PROTOS" symbol, which indicates
to the C program that supplies prototypes for the various getproto*() func-
tions. See also netdbtype.U for probing for various netdb types.
"d_getprpwnam"
From d_getprpwnam.U:
This variable conditionally defines "HAS_GETPRPWNAM" if getprpwnam() is available to
retrieve protected (shadow) password entries by name.
"d_getpwent"
From d_getpwent.U:
This variable conditionally defines the "HAS_GETPWENT" symbol, which indicates to the
C program that the getpwent() routine is available for sequential access of the passwd
database.
"d_getpwent_r"
From d_getpwent_r.U:
This variable conditionally defines the "HAS_GETPWENT_R" symbol, which indicates to
the C program that the getpwent_r() routine is available.
"d_getpwnam_r"
From d_getpwnam_r.U:
This variable conditionally defines the "HAS_GETPWNAM_R" symbol, which indicates to
the C program that the getpwnam_r() routine is available.
"d_getpwuid_r"
From d_getpwuid_r.U:
This variable conditionally defines the "HAS_GETPWUID_R" symbol, which indicates to
the C program that the getpwuid_r() routine is available.
"d_getsbyname"
From d_getsrvby.U:
This variable conditionally defines the "HAS_GETSERVBYNAME" symbol, which indicates to
the C program that the getservbyname() routine is available to look up services by
their name.
"d_getsbyport"
From d_getsrvby.U:
This variable conditionally defines the "HAS_GETSERVBYPORT" symbol, which indicates to
the C program that the getservbyport() routine is available to look up services by
their port.
"d_getsent"
From d_getsent.U:
This variable conditionally defines "HAS_GETSERVENT" if getservent() is available to
look up network services in some data base or another.
"d_getservbyname_r"
From d_getservbyname_r.U:
This variable conditionally defines the "HAS_GETSERVBYNAME_R" symbol, which indicates
to the C program that the getservbyname_r() routine is available.
"d_getservbyport_r"
From d_getservbyport_r.U:
This variable conditionally defines the "HAS_GETSERVBYPORT_R" symbol, which indicates
to the C program that the getservbyport_r() routine is available.
"d_getservent_r"
From d_getservent_r.U:
This variable conditionally defines the "HAS_GETSERVENT_R" symbol, which indicates to
the C program that the getservent_r() routine is available.
"d_getservprotos"
From d_getservprotos.U:
This variable conditionally defines the "HAS_GETSERV_PROTOS" symbol, which indicates
to the C program that supplies prototypes for the various getserv*() func-
tions. See also netdbtype.U for probing for various netdb types.
"d_getspnam"
From d_getspnam.U:
This variable conditionally defines "HAS_GETSPNAM" if getspnam() is available to
retrieve SysV shadow password entries by name.
"d_getspnam_r"
From d_getspnam_r.U:
This variable conditionally defines the "HAS_GETSPNAM_R" symbol, which indicates to
the C program that the getspnam_r() routine is available.
"d_gettimeod"
From d_ftime.U:
This variable conditionally defines the "HAS_GETTIMEOFDAY" symbol, which indicates
that the gettimeofday() system call exists (to obtain a sub-second accuracy clock).
You should probably include .
"d_gmtime_r"
From d_gmtime_r.U:
This variable conditionally defines the "HAS_GMTIME_R" symbol, which indicates to the
C program that the gmtime_r() routine is available.
"d_gnulibc"
From d_gnulibc.U:
Defined if we're dealing with the "GNU" C Library.
"d_grpasswd"
From i_grp.U:
This variable conditionally defines "GRPASSWD", which indicates that struct group in
contains gr_passwd.
"d_hasmntopt"
From d_hasmntopt.U:
This variable conditionally defines the "HAS_HASMNTOPT" symbol, which indicates to the
C program that the hasmntopt() routine is available to query the mount options of file
systems.
"d_htonl"
From d_htonl.U:
This variable conditionally defines "HAS_HTONL" if htonl() and its friends are avail-
able to do network order byte swapping.
"d_ilogbl"
From d_ilogbl.U:
This variable conditionally defines the "HAS_ILOGBL" symbol, which indicates to the C
program that the ilogbl() routine is available. If scalbnl is also present we can
emulate frexpl.
"d_index"
From d_strchr.U:
This variable conditionally defines "HAS_INDEX" if index() and rindex() are available
for string searching.
"d_inetaton"
From d_inetaton.U:
This variable conditionally defines the "HAS_INET_ATON" symbol, which indicates to the
C program that the inet_aton() function is available to parse "IP" address "dot-
ted-quad" strings.
"d_int64_t"
From d_int64_t.U:
This symbol will be defined if the C compiler supports int64_t.
"d_isascii"
From d_isascii.U:
This variable conditionally defines the "HAS_ISASCII" constant, which indicates to the
C program that isascii() is available.
"d_isfinite"
From d_isfinite.U:
This variable conditionally defines the "HAS_ISFINITE" symbol, which indicates to the
C program that the isfinite() routine is available.
"d_isinf"
From d_isinf.U:
This variable conditionally defines the "HAS_ISINF" symbol, which indicates to the C
program that the isinf() routine is available.
"d_isnan"
From d_isnan.U:
This variable conditionally defines the "HAS_ISNAN" symbol, which indicates to the C
program that the isnan() routine is available.
"d_isnanl"
From d_isnanl.U:
This variable conditionally defines the "HAS_ISNANL" symbol, which indicates to the C
program that the isnanl() routine is available.
"d_killpg"
From d_killpg.U:
This variable conditionally defines the "HAS_KILLPG" symbol, which indicates to the C
program that the killpg() routine is available to kill process groups.
"d_lchown"
From d_lchown.U:
This variable conditionally defines the "HAS_LCHOWN" symbol, which indicates to the C
program that the lchown() routine is available to operate on a symbolic link (instead
of following the link).
"d_ldbl_dig"
From d_ldbl_dig.U:
This variable conditionally defines d_ldbl_dig if this system's header files provide
"LDBL_DIG", which is the number of significant digits in a long double precision num-
ber.
"d_link"
From d_link.U:
This variable conditionally defines "HAS_LINK" if link() is available to create hard
links.
"d_localtime_r"
From d_localtime_r.U:
This variable conditionally defines the "HAS_LOCALTIME_R" symbol, which indicates to
the C program that the localtime_r() routine is available.
"d_locconv"
From d_locconv.U:
This variable conditionally defines "HAS_LOCALECONV" if localeconv() is available for
numeric and monetary formatting conventions.
"d_lockf"
From d_lockf.U:
This variable conditionally defines "HAS_LOCKF" if lockf() is available to do file
locking.
"d_longdbl"
From d_longdbl.U:
This variable conditionally defines "HAS_LONG_DOUBLE" if the long double type is sup-
ported.
"d_longlong"
From d_longlong.U:
This variable conditionally defines "HAS_LONG_LONG" if the long long type is sup-
ported.
"d_lseekproto"
From d_lseekproto.U:
This variable conditionally defines the "HAS_LSEEK_PROTO" symbol, which indicates to
the C program that the system provides a prototype for the lseek() function. Other-
wise, it is up to the program to supply one.
"d_lstat"
From d_lstat.U:
This variable conditionally defines "HAS_LSTAT" if lstat() is available to do file
stats on symbolic links.
"d_madvise"
From d_madvise.U:
This variable conditionally defines "HAS_MADVISE" if madvise() is available to map a
file into memory.
"d_malloc_size"
From d_malloc_size.U:
This symbol, if defined, indicates that the malloc_size routine is available for use.
"d_malloc_good_size"
From d_malloc_good_size.U:
This symbol, if defined, indicates that the malloc_good_size routine is available for
use.
"d_mblen"
From d_mblen.U:
This variable conditionally defines the "HAS_MBLEN" symbol, which indicates to the C
program that the mblen() routine is available to find the number of bytes in a multi-
bye character.
"d_mbstowcs"
From d_mbstowcs.U:
This variable conditionally defines the "HAS_MBSTOWCS" symbol, which indicates to the
C program that the mbstowcs() routine is available to convert a multibyte string into
a wide character string.
"d_mbtowc"
From d_mbtowc.U:
This variable conditionally defines the "HAS_MBTOWC" symbol, which indicates to the C
program that the mbtowc() routine is available to convert multibyte to a wide charac-
ter.
"d_memchr"
From d_memchr.U:
This variable conditionally defines the "HAS_MEMCHR" symbol, which indicates to the C
program that the memchr() routine is available to locate characters within a C string.
"d_memcmp"
From d_memcmp.U:
This variable conditionally defines the "HAS_MEMCMP" symbol, which indicates to the C
program that the memcmp() routine is available to compare blocks of memory.
"d_memcpy"
From d_memcpy.U:
This variable conditionally defines the "HAS_MEMCPY" symbol, which indicates to the C
program that the memcpy() routine is available to copy blocks of memory.
"d_memmove"
From d_memmove.U:
This variable conditionally defines the "HAS_MEMMOVE" symbol, which indicates to the C
program that the memmove() routine is available to copy potentatially overlapping
blocks of memory.
"d_memset"
From d_memset.U:
This variable conditionally defines the "HAS_MEMSET" symbol, which indicates to the C
program that the memset() routine is available to set blocks of memory.
"d_mkdir"
From d_mkdir.U:
This variable conditionally defines the "HAS_MKDIR" symbol, which indicates to the C
program that the mkdir() routine is available to create directories..
"d_mkdtemp"
From d_mkdtemp.U:
This variable conditionally defines the "HAS_MKDTEMP" symbol, which indicates to the C
program that the mkdtemp() routine is available to exclusively create a uniquely named
temporary directory.
"d_mkfifo"
From d_mkfifo.U:
This variable conditionally defines the "HAS_MKFIFO" symbol, which indicates to the C
program that the mkfifo() routine is available.
"d_mkstemp"
From d_mkstemp.U:
This variable conditionally defines the "HAS_MKSTEMP" symbol, which indicates to the C
program that the mkstemp() routine is available to exclusively create and open a
uniquely named temporary file.
"d_mkstemps"
From d_mkstemps.U:
This variable conditionally defines the "HAS_MKSTEMPS" symbol, which indicates to the
C program that the mkstemps() routine is available to exclusively create and open a
uniquely named (with a suffix) temporary file.
"d_mktime"
From d_mktime.U:
This variable conditionally defines the "HAS_MKTIME" symbol, which indicates to the C
program that the mktime() routine is available.
"d_mmap"
From d_mmap.U:
This variable conditionally defines "HAS_MMAP" if mmap() is available to map a file
into memory.
"d_modfl"
From d_modfl.U:
This variable conditionally defines the "HAS_MODFL" symbol, which indicates to the C
program that the modfl() routine is available.
"d_modfl_pow32_bug"
From d_modfl.U:
This variable conditionally defines the HAS_MODFL_POW32_BUG symbol, which indicates
that modfl() is broken for long doubles >= pow(2, 32). For example from
4294967303.150000 one would get 4294967302.000000 and 1.150000. The bug has been seen
in certain versions of glibc, release 2.2.2 is known to be okay.
"d_modflproto"
From d_modfl.U:
This symbol, if defined, indicates that the system provides a prototype for the
modfl() function. Otherwise, it is up to the program to supply one. C99 says it
should be long double modfl(long double, long double *);
"d_mprotect"
From d_mprotect.U:
This variable conditionally defines "HAS_MPROTECT" if mprotect() is available to mod-
ify the access protection of a memory mapped file.
"d_msg"
From d_msg.U:
This variable conditionally defines the "HAS_MSG" symbol, which indicates that the
entire msg*(2) library is present.
"d_msg_ctrunc"
From d_socket.U:
This variable conditionally defines the "HAS_MSG_CTRUNC" symbol, which indicates that
the "MSG_CTRUNC" is available. #ifdef is not enough because it may be an enum, glibc
has been known to do this.
"d_msg_dontroute"
From d_socket.U:
This variable conditionally defines the "HAS_MSG_DONTROUTE" symbol, which indicates
that the "MSG_DONTROUTE" is available. #ifdef is not enough because it may be an
enum, glibc has been known to do this.
"d_msg_oob"
From d_socket.U:
This variable conditionally defines the "HAS_MSG_OOB" symbol, which indicates that the
"MSG_OOB" is available. #ifdef is not enough because it may be an enum, glibc has
been known to do this.
"d_msg_peek"
From d_socket.U:
This variable conditionally defines the "HAS_MSG_PEEK" symbol, which indicates that
the "MSG_PEEK" is available. #ifdef is not enough because it may be an enum, glibc
has been known to do this.
"d_msg_proxy"
From d_socket.U:
This variable conditionally defines the "HAS_MSG_PROXY" symbol, which indicates that
the "MSG_PROXY" is available. #ifdef is not enough because it may be an enum, glibc
has been known to do this.
"d_msgctl"
From d_msgctl.U:
This variable conditionally defines the "HAS_MSGCTL" symbol, which indicates to the C
program that the msgctl() routine is available.
"d_msgget"
From d_msgget.U:
This variable conditionally defines the "HAS_MSGGET" symbol, which indicates to the C
program that the msgget() routine is available.
"d_msghdr_s"
From d_msghdr_s.U:
This variable conditionally defines the "HAS_STRUCT_MSGHDR" symbol, which indicates
that the struct msghdr is supported.
"d_msgrcv"
From d_msgrcv.U:
This variable conditionally defines the "HAS_MSGRCV" symbol, which indicates to the C
program that the msgrcv() routine is available.
"d_msgsnd"
From d_msgsnd.U:
This variable conditionally defines the "HAS_MSGSND" symbol, which indicates to the C
program that the msgsnd() routine is available.
"d_msync"
From d_msync.U:
This variable conditionally defines "HAS_MSYNC" if msync() is available to synchronize
a mapped file.
"d_munmap"
From d_munmap.U:
This variable conditionally defines "HAS_MUNMAP" if munmap() is available to unmap a
region mapped by mmap().
"d_mymalloc"
From mallocsrc.U:
This variable conditionally defines "MYMALLOC" in case other parts of the source want
to take special action if "MYMALLOC" is used. This may include different sorts of
profiling or error detection.
"d_nanosleep"
From d_nanosleep.U:
This variable conditionally defines "HAS_NANOSLEEP" if nanosleep() is available to
sleep with 1E-9 sec accuracy.
"d_nice"
From d_nice.U:
This variable conditionally defines the "HAS_NICE" symbol, which indicates to the C
program that the nice() routine is available.
"d_nl_langinfo"
From d_nl_langinfo.U:
This variable conditionally defines the "HAS_NL_LANGINFO" symbol, which indicates to
the C program that the nl_langinfo() routine is available.
"d_nv_preserves_uv"
From perlxv.U:
This variable indicates whether a variable of type nvtype can preserve all the bits a
variable of type uvtype.
"d_nv_zero_is_allbits_zero"
From perlxv.U:
This variable indicates whether a variable of type nvtype stores 0.0 in memory as all
bits zero.
"d_off64_t"
From d_off64_t.U:
This symbol will be defined if the C compiler supports off64_t.
"d_old_pthread_create_joinable"
From d_pthrattrj.U:
This variable conditionally defines pthread_create_joinable. undef if pthread.h
defines "PTHREAD_CREATE_JOINABLE".
"d_oldpthreads"
From usethreads.U:
This variable conditionally defines the "OLD_PTHREADS_API" symbol, and indicates that
Perl should be built to use the old draft "POSIX" threads "API". This is only poten-
tially meaningful if usethreads is set.
"d_oldsock"
From d_socket.U:
This variable conditionally defines the "OLDSOCKET" symbol, which indicates that the
"BSD" socket interface is based on 4.1c and not 4.2.
"d_open3"
From d_open3.U:
This variable conditionally defines the HAS_OPEN3 manifest constant, which indicates
to the C program that the 3 argument version of the open(2) function is available.
"d_pathconf"
From d_pathconf.U:
This variable conditionally defines the "HAS_PATHCONF" symbol, which indicates to the
C program that the pathconf() routine is available to determine file-system related
limits and options associated with a given filename.
"d_pause"
From d_pause.U:
This variable conditionally defines the "HAS_PAUSE" symbol, which indicates to the C
program that the pause() routine is available to suspend a process until a signal is
received.
"d_perl_otherlibdirs"
From otherlibdirs.U:
This variable conditionally defines "PERL_OTHERLIBDIRS", which contains a colon-sepa-
rated set of paths for the perl binary to include in @"INC". See also otherlibdirs.
"d_phostname"
From d_gethname.U:
This variable conditionally defines the "HAS_PHOSTNAME" symbol, which contains the
shell command which, when fed to popen(), may be used to derive the host name.
"d_pipe"
From d_pipe.U:
This variable conditionally defines the "HAS_PIPE" symbol, which indicates to the C
program that the pipe() routine is available to create an inter-process channel.
"d_poll"
From d_poll.U:
This variable conditionally defines the "HAS_POLL" symbol, which indicates to the C
program that the poll() routine is available to poll active file descriptors.
"d_portable"
From d_portable.U:
This variable conditionally defines the "PORTABLE" symbol, which indicates to the C
program that it should not assume that it is running on the machine it was compiled
on.
"d_PRId64"
From quadfio.U:
This variable conditionally defines the PERL_PRId64 symbol, which indiciates that
stdio has a symbol to print 64-bit decimal numbers.
"d_PRIeldbl"
From longdblfio.U:
This variable conditionally defines the PERL_PRIfldbl symbol, which indiciates that
stdio has a symbol to print long doubles.
"d_PRIEUldbl"
From longdblfio.U:
This variable conditionally defines the PERL_PRIfldbl symbol, which indiciates that
stdio has a symbol to print long doubles. The "U" in the name is to separate this
from d_PRIeldbl so that even case-blind systems can see the difference.
"d_PRIfldbl"
From longdblfio.U:
This variable conditionally defines the PERL_PRIfldbl symbol, which indiciates that
stdio has a symbol to print long doubles.
"d_PRIFUldbl"
From longdblfio.U:
This variable conditionally defines the PERL_PRIfldbl symbol, which indiciates that
stdio has a symbol to print long doubles. The "U" in the name is to separate this
from d_PRIfldbl so that even case-blind systems can see the difference.
"d_PRIgldbl"
From longdblfio.U:
This variable conditionally defines the PERL_PRIfldbl symbol, which indiciates that
stdio has a symbol to print long doubles.
"d_PRIGUldbl"
From longdblfio.U:
This variable conditionally defines the PERL_PRIfldbl symbol, which indiciates that
stdio has a symbol to print long doubles. The "U" in the name is to separate this
from d_PRIgldbl so that even case-blind systems can see the difference.
"d_PRIi64"
From quadfio.U:
This variable conditionally defines the PERL_PRIi64 symbol, which indiciates that
stdio has a symbol to print 64-bit decimal numbers.
"d_PRIo64"
From quadfio.U:
This variable conditionally defines the PERL_PRIo64 symbol, which indiciates that
stdio has a symbol to print 64-bit octal numbers.
"d_PRIu64"
From quadfio.U:
This variable conditionally defines the PERL_PRIu64 symbol, which indiciates that
stdio has a symbol to print 64-bit unsigned decimal numbers.
"d_PRIx64"
From quadfio.U:
This variable conditionally defines the PERL_PRIx64 symbol, which indiciates that
stdio has a symbol to print 64-bit hexadecimal numbers.
"d_PRIXU64"
From quadfio.U:
This variable conditionally defines the PERL_PRIXU64 symbol, which indiciates that
stdio has a symbol to print 64-bit hExADECimAl numbers. The "U" in the name is to
separate this from d_PRIx64 so that even case-blind systems can see the difference.
"d_procselfexe"
From d_procselfexe.U:
Defined if $procselfexe is symlink to the absolute pathname of the executing program.
"d_pthread_atfork"
From d_pthread_atfork.U:
This variable conditionally defines the "HAS_PTHREAD_ATFORK" symbol, which indicates
to the C program that the pthread_atfork() routine is available.
"d_pthread_attr_setscope"
From d_pthread_attr_ss.U:
This variable conditionally defines "HAS_PTHREAD_ATTR_SETSCOPE" if
pthread_attr_setscope() is available to set the contention scope attribute of a thread
attribute object.
"d_pthread_yield"
From d_pthread_y.U:
This variable conditionally defines the "HAS_PTHREAD_YIELD" symbol if the
pthread_yield routine is available to yield the execution of the current thread.
"d_pwage"
From i_pwd.U:
This variable conditionally defines "PWAGE", which indicates that struct passwd con-
tains pw_age.
"d_pwchange"
From i_pwd.U:
This variable conditionally defines "PWCHANGE", which indicates that struct passwd
contains pw_change.
"d_pwclass"
From i_pwd.U:
This variable conditionally defines "PWCLASS", which indicates that struct passwd
contains pw_class.
"d_pwcomment"
From i_pwd.U:
This variable conditionally defines "PWCOMMENT", which indicates that struct passwd
contains pw_comment.
"d_pwexpire"
From i_pwd.U:
This variable conditionally defines "PWEXPIRE", which indicates that struct passwd
contains pw_expire.
"d_pwgecos"
From i_pwd.U:
This variable conditionally defines "PWGECOS", which indicates that struct passwd con-
tains pw_gecos.
"d_pwpasswd"
From i_pwd.U:
This variable conditionally defines "PWPASSWD", which indicates that struct passwd
contains pw_passwd.
"d_pwquota"
From i_pwd.U:
This variable conditionally defines "PWQUOTA", which indicates that struct passwd con-
tains pw_quota.
"d_qgcvt"
From d_qgcvt.U:
This variable conditionally defines the "HAS_QGCVT" symbol, which indicates to the C
program that the qgcvt() routine is available.
"d_quad"
From quadtype.U:
This variable, if defined, tells that there's a 64-bit integer type, quadtype.
"d_random_r"
From d_random_r.U:
This variable conditionally defines the "HAS_RANDOM_R" symbol, which indicates to the
C program that the random_r() routine is available.
"d_readdir64_r"
From d_readdir64_r.U:
This variable conditionally defines the HAS_READDIR64_R symbol, which indicates to the
C program that the readdir64_r() routine is available.
"d_readdir"
From d_readdir.U:
This variable conditionally defines "HAS_READDIR" if readdir() is available to read
directory entries.
"d_readdir_r"
From d_readdir_r.U:
This variable conditionally defines the "HAS_READDIR_R" symbol, which indicates to the
C program that the readdir_r() routine is available.
"d_readlink"
From d_readlink.U:
This variable conditionally defines the "HAS_READLINK" symbol, which indicates to the
C program that the readlink() routine is available to read the value of a symbolic
link.
"d_readv"
From d_readv.U:
This variable conditionally defines the "HAS_READV" symbol, which indicates to the C
program that the readv() routine is available.
"d_recvmsg"
From d_recvmsg.U:
This variable conditionally defines the "HAS_RECVMSG" symbol, which indicates to the C
program that the recvmsg() routine is available.
"d_rename"
From d_rename.U:
This variable conditionally defines the "HAS_RENAME" symbol, which indicates to the C
program that the rename() routine is available to rename files.
"d_rewinddir"
From d_readdir.U:
This variable conditionally defines "HAS_REWINDDIR" if rewinddir() is available.
"d_rmdir"
From d_rmdir.U:
This variable conditionally defines "HAS_RMDIR" if rmdir() is available to remove
directories.
"d_safebcpy"
From d_safebcpy.U:
This variable conditionally defines the "HAS_SAFE_BCOPY" symbol if the bcopy() routine
can do overlapping copies. Normally, you should probably use memmove().
"d_safemcpy"
From d_safemcpy.U:
This variable conditionally defines the "HAS_SAFE_MEMCPY" symbol if the memcpy() rou-
tine can do overlapping copies. For overlapping copies, memmove() should be used, if
available.
"d_sanemcmp"
From d_sanemcmp.U:
This variable conditionally defines the "HAS_SANE_MEMCMP" symbol if the memcpy() rou-
tine is available and can be used to compare relative magnitudes of chars with their
high bits set.
"d_sbrkproto"
From d_sbrkproto.U:
This variable conditionally defines the "HAS_SBRK_PROTO" symbol, which indicates to
the C program that the system provides a prototype for the sbrk() function. Other-
wise, it is up to the program to supply one.
"d_scalbnl"
From d_scalbnl.U:
This variable conditionally defines the "HAS_SCALBNL" symbol, which indicates to the C
program that the scalbnl() routine is available. If ilogbl is also present we can
emulate frexpl.
"d_sched_yield"
From d_pthread_y.U:
This variable conditionally defines the "HAS_SCHED_YIELD" symbol if the sched_yield
routine is available to yield the execution of the current thread.
"d_scm_rights"
From d_socket.U:
This variable conditionally defines the "HAS_SCM_RIGHTS" symbol, which indicates that
the "SCM_RIGHTS" is available. #ifdef is not enough because it may be an enum, glibc
has been known to do this.
"d_SCNfldbl"
From longdblfio.U:
This variable conditionally defines the PERL_PRIfldbl symbol, which indiciates that
stdio has a symbol to scan long doubles.
"d_seekdir"
From d_readdir.U:
This variable conditionally defines "HAS_SEEKDIR" if seekdir() is available.
"d_select"
From d_select.U:
This variable conditionally defines "HAS_SELECT" if select() is available to select
active file descriptors. A inclusion may be necessary for the timeout
field.
"d_sem"
From d_sem.U:
This variable conditionally defines the "HAS_SEM" symbol, which indicates that the
entire sem*(2) library is present.
"d_semctl"
From d_semctl.U:
This variable conditionally defines the "HAS_SEMCTL" symbol, which indicates to the C
program that the semctl() routine is available.
"d_semctl_semid_ds"
From d_union_semun.U:
This variable conditionally defines "USE_SEMCTL_SEMID_DS", which indicates that struct
semid_ds * is to be used for semctl "IPC_STAT".
"d_semctl_semun"
From d_union_semun.U:
This variable conditionally defines "USE_SEMCTL_SEMUN", which indicates that union
semun is to be used for semctl "IPC_STAT".
"d_semget"
From d_semget.U:
This variable conditionally defines the "HAS_SEMGET" symbol, which indicates to the C
program that the semget() routine is available.
"d_semop"
From d_semop.U:
This variable conditionally defines the "HAS_SEMOP" symbol, which indicates to the C
program that the semop() routine is available.
"d_sendmsg"
From d_sendmsg.U:
This variable conditionally defines the "HAS_SENDMSG" symbol, which indicates to the C
program that the sendmsg() routine is available.
"d_setegid"
From d_setegid.U:
This variable conditionally defines the "HAS_SETEGID" symbol, which indicates to the C
program that the setegid() routine is available to change the effective gid of the
current program.
"d_seteuid"
From d_seteuid.U:
This variable conditionally defines the "HAS_SETEUID" symbol, which indicates to the C
program that the seteuid() routine is available to change the effective uid of the
current program.
"d_setgrent"
From d_setgrent.U:
This variable conditionally defines the "HAS_SETGRENT" symbol, which indicates to the
C program that the setgrent() routine is available for initializing sequential access
to the group database.
"d_setgrent_r"
From d_setgrent_r.U:
This variable conditionally defines the "HAS_SETGRENT_R" symbol, which indicates to
the C program that the setgrent_r() routine is available.
"d_setgrps"
From d_setgrps.U:
This variable conditionally defines the "HAS_SETGROUPS" symbol, which indicates to the
C program that the setgroups() routine is available to set the list of process groups.
"d_sethent"
From d_sethent.U:
This variable conditionally defines "HAS_SETHOSTENT" if sethostent() is available.
"d_sethostent_r"
From d_sethostent_r.U:
This variable conditionally defines the "HAS_SETHOSTENT_R" symbol, which indicates to
the C program that the sethostent_r() routine is available.
"d_setitimer"
From d_setitimer.U:
This variable conditionally defines the "HAS_SETITIMER" symbol, which indicates to the
C program that the setitimer() routine is available.
"d_setlinebuf"
From d_setlnbuf.U:
This variable conditionally defines the "HAS_SETLINEBUF" symbol, which indicates to
the C program that the setlinebuf() routine is available to change stderr or stdout
from block-buffered or unbuffered to a line-buffered mode.
"d_setlocale"
From d_setlocale.U:
This variable conditionally defines "HAS_SETLOCALE" if setlocale() is available to
handle locale-specific ctype implementations.
"d_setlocale_r"
From d_setlocale_r.U:
This variable conditionally defines the "HAS_SETLOCALE_R" symbol, which indicates to
the C program that the setlocale_r() routine is available.
"d_setnent"
From d_setnent.U:
This variable conditionally defines "HAS_SETNETENT" if setnetent() is available.
"d_setnetent_r"
From d_setnetent_r.U:
This variable conditionally defines the "HAS_SETNETENT_R" symbol, which indicates to
the C program that the setnetent_r() routine is available.
"d_setpent"
From d_setpent.U:
This variable conditionally defines "HAS_SETPROTOENT" if setprotoent() is available.
"d_setpgid"
From d_setpgid.U:
This variable conditionally defines the "HAS_SETPGID" symbol if the setpgid(pid, gpid)
function is available to set process group "ID".
"d_setpgrp2"
From d_setpgrp2.U:
This variable conditionally defines the HAS_SETPGRP2 symbol, which indicates to the C
program that the setpgrp2() (as in DG/"UX") routine is available to set the current
process group.
"d_setpgrp"
From d_setpgrp.U:
This variable conditionally defines "HAS_SETPGRP" if setpgrp() is available to set the
current process group.
"d_setprior"
From d_setprior.U:
This variable conditionally defines "HAS_SETPRIORITY" if setpriority() is available to
set a process's priority.
"d_setproctitle"
From d_setproctitle.U:
This variable conditionally defines the "HAS_SETPROCTITLE" symbol, which indicates to
the C program that the setproctitle() routine is available.
"d_setprotoent_r"
From d_setprotoent_r.U:
This variable conditionally defines the "HAS_SETPROTOENT_R" symbol, which indicates to
the C program that the setprotoent_r() routine is available.
"d_setpwent"
From d_setpwent.U:
This variable conditionally defines the "HAS_SETPWENT" symbol, which indicates to the
C program that the setpwent() routine is available for initializing sequential access
to the passwd database.
"d_setpwent_r"
From d_setpwent_r.U:
This variable conditionally defines the "HAS_SETPWENT_R" symbol, which indicates to
the C program that the setpwent_r() routine is available.
"d_setregid"
From d_setregid.U:
This variable conditionally defines "HAS_SETREGID" if setregid() is available to
change the real and effective gid of the current process.
"d_setresgid"
From d_setregid.U:
This variable conditionally defines "HAS_SETRESGID" if setresgid() is available to
change the real, effective and saved gid of the current process.
"d_setresuid"
From d_setreuid.U:
This variable conditionally defines "HAS_SETREUID" if setresuid() is available to
change the real, effective and saved uid of the current process.
"d_setreuid"
From d_setreuid.U:
This variable conditionally defines "HAS_SETREUID" if setreuid() is available to
change the real and effective uid of the current process.
"d_setrgid"
From d_setrgid.U:
This variable conditionally defines the "HAS_SETRGID" symbol, which indicates to the C
program that the setrgid() routine is available to change the real gid of the current
program.
"d_setruid"
From d_setruid.U:
This variable conditionally defines the "HAS_SETRUID" symbol, which indicates to the C
program that the setruid() routine is available to change the real uid of the current
program.
"d_setsent"
From d_setsent.U:
This variable conditionally defines "HAS_SETSERVENT" if setservent() is available.
"d_setservent_r"
From d_setservent_r.U:
This variable conditionally defines the "HAS_SETSERVENT_R" symbol, which indicates to
the C program that the setservent_r() routine is available.
"d_setsid"
From d_setsid.U:
This variable conditionally defines "HAS_SETSID" if setsid() is available to set the
process group "ID".
"d_setvbuf"
From d_setvbuf.U:
This variable conditionally defines the "HAS_SETVBUF" symbol, which indicates to the C
program that the setvbuf() routine is available to change buffering on an open stdio
stream.
"d_sfio"
From d_sfio.U:
This variable conditionally defines the "USE_SFIO" symbol, and indicates whether sfio
is available (and should be used).
"d_shm"
From d_shm.U:
This variable conditionally defines the "HAS_SHM" symbol, which indicates that the
entire shm*(2) library is present.
"d_shmat"
From d_shmat.U:
This variable conditionally defines the "HAS_SHMAT" symbol, which indicates to the C
program that the shmat() routine is available.
"d_shmatprototype"
From d_shmat.U:
This variable conditionally defines the "HAS_SHMAT_PROTOTYPE" symbol, which indicates
that sys/shm.h has a prototype for shmat.
"d_shmctl"
From d_shmctl.U:
This variable conditionally defines the "HAS_SHMCTL" symbol, which indicates to the C
program that the shmctl() routine is available.
"d_shmdt"
From d_shmdt.U:
This variable conditionally defines the "HAS_SHMDT" symbol, which indicates to the C
program that the shmdt() routine is available.
"d_shmget"
From d_shmget.U:
This variable conditionally defines the "HAS_SHMGET" symbol, which indicates to the C
program that the shmget() routine is available.
"d_sigaction"
From d_sigaction.U:
This variable conditionally defines the "HAS_SIGACTION" symbol, which indicates that
the Vr4 sigaction() routine is available.
"d_sigprocmask"
From d_sigprocmask.U:
This variable conditionally defines "HAS_SIGPROCMASK" if sigprocmask() is available to
examine or change the signal mask of the calling process.
"d_sigsetjmp"
From d_sigsetjmp.U:
This variable conditionally defines the "HAS_SIGSETJMP" symbol, which indicates that
the sigsetjmp() routine is available to call setjmp() and optionally save the pro-
cess's signal mask.
"d_sockatmark"
From d_sockatmark.U:
This variable conditionally defines the "HAS_SOCKATMARK" symbol, which indicates to
the C program that the sockatmark() routine is available.
"d_sockatmarkproto"
From d_sockatmarkproto.U:
This variable conditionally defines the "HAS_SOCKATMARK_PROTO" symbol, which indicates
to the C program that the system provides a prototype for the sockatmark() function.
Otherwise, it is up to the program to supply one.
"d_socket"
From d_socket.U:
This variable conditionally defines "HAS_SOCKET", which indicates that the "BSD"
socket interface is supported.
"d_socklen_t"
From d_socklen_t.U:
This symbol will be defined if the C compiler supports socklen_t.
"d_sockpair"
From d_socket.U:
This variable conditionally defines the "HAS_SOCKETPAIR" symbol, which indicates that
the "BSD" socketpair() is supported.
"d_socks5_init"
From d_socks5_init.U:
This variable conditionally defines the HAS_SOCKS5_INIT symbol, which indicates to the
C program that the socks5_init() routine is available.
"d_sprintf_returns_strlen"
From d_sprintf_returns_strlen.U:
This variable defines whether sprintf returns the length of the string (as per the
"ANSI" spec). Some C libraries retain compatibility with pre-"ANSI" C and return a
pointer to the passed in buffer; for these this variable will be undef.
"d_sqrtl"
From d_sqrtl.U:
This variable conditionally defines the "HAS_SQRTL" symbol, which indicates to the C
program that the sqrtl() routine is available.
"d_srand48_r"
From d_srand48_r.U:
This variable conditionally defines the HAS_SRAND48_R symbol, which indicates to the C
program that the srand48_r() routine is available.
"d_srandom_r"
From d_srandom_r.U:
This variable conditionally defines the "HAS_SRANDOM_R" symbol, which indicates to the
C program that the srandom_r() routine is available.
"d_sresgproto"
From d_sresgproto.U:
This variable conditionally defines the "HAS_SETRESGID_PROTO" symbol, which indicates
to the C program that the system provides a prototype for the setresgid() function.
Otherwise, it is up to the program to supply one.
"d_sresuproto"
From d_sresuproto.U:
This variable conditionally defines the "HAS_SETRESUID_PROTO" symbol, which indicates
to the C program that the system provides a prototype for the setresuid() function.
Otherwise, it is up to the program to supply one.
"d_statblks"
From d_statblks.U:
This variable conditionally defines "USE_STAT_BLOCKS" if this system has a stat struc-
ture declaring st_blksize and st_blocks.
"d_statfs_f_flags"
From d_statfs_f_flags.U:
This variable conditionally defines the "HAS_STRUCT_STATFS_F_FLAGS" symbol, which
indicates to struct statfs from has f_flags member. This kind of struct statfs is
coming from sys/mount.h ("BSD"), not from sys/statfs.h ("SYSV").
"d_statfs_s"
From d_statfs_s.U:
This variable conditionally defines the "HAS_STRUCT_STATFS" symbol, which indicates
that the struct statfs is supported.
"d_statvfs"
From d_statvfs.U:
This variable conditionally defines the "HAS_STATVFS" symbol, which indicates to the C
program that the statvfs() routine is available.
"d_stdio_cnt_lval"
From d_stdstdio.U:
This variable conditionally defines "STDIO_CNT_LVALUE" if the "FILE_cnt" macro can be
used as an lvalue.
"d_stdio_ptr_lval"
From d_stdstdio.U:
This variable conditionally defines "STDIO_PTR_LVALUE" if the "FILE_ptr" macro can be
used as an lvalue.
"d_stdio_ptr_lval_nochange_cnt"
From d_stdstdio.U:
This symbol is defined if using the "FILE_ptr" macro as an lvalue to increase the
pointer by n leaves File_cnt(fp) unchanged.
"d_stdio_ptr_lval_sets_cnt"
From d_stdstdio.U:
This symbol is defined if using the "FILE_ptr" macro as an lvalue to increase the
pointer by n has the side effect of decreasing the value of File_cnt(fp) by n.
"d_stdio_stream_array"
From stdio_streams.U:
This variable tells whether there is an array holding the stdio streams.
"d_stdiobase"
From d_stdstdio.U:
This variable conditionally defines "USE_STDIO_BASE" if this system has a "FILE"
structure declaring a usable _base field (or equivalent) in stdio.h.
"d_stdstdio"
From d_stdstdio.U:
This variable conditionally defines "USE_STDIO_PTR" if this system has a "FILE" struc-
ture declaring usable _ptr and _cnt fields (or equivalent) in stdio.h.
"d_strchr"
From d_strchr.U:
This variable conditionally defines "HAS_STRCHR" if strchr() and strrchr() are avail-
able for string searching.
"d_strcoll"
From d_strcoll.U:
This variable conditionally defines "HAS_STRCOLL" if strcoll() is available to compare
strings using collating information.
"d_strctcpy"
From d_strctcpy.U:
This variable conditionally defines the "USE_STRUCT_COPY" symbol, which indicates to
the C program that this C compiler knows how to copy structures.
"d_strerrm"
From d_strerror.U:
This variable holds what Strerrr is defined as to translate an error code condition
into an error message string. It could be "strerror" or a more "complex" macro emulat-
ing strrror with sys_errlist[], or the "unknown" string when both strerror and
sys_errlist are missing.
"d_strerror"
From d_strerror.U:
This variable conditionally defines "HAS_STRERROR" if strerror() is available to
translate error numbers to strings.
"d_strerror_r"
From d_strerror_r.U:
This variable conditionally defines the "HAS_STRERROR_R" symbol, which indicates to
the C program that the strerror_r() routine is available.
"d_strftime"
From d_strftime.U:
This variable conditionally defines the "HAS_STRFTIME" symbol, which indicates to the
C program that the strftime() routine is available.
"d_strlcat"
From d_strlcat.U:
This variable conditionally defines the "HAS_STRLCAT" symbol, which indicates to the C
program that the strlcat () routine is available.
"d_strlcpy"
From d_strlcpy.U:
This variable conditionally defines the "HAS_STRLCPY" symbol, which indicates to the C
program that the strlcpy () routine is available.
"d_strtod"
From d_strtod.U:
This variable conditionally defines the "HAS_STRTOD" symbol, which indicates to the C
program that the strtod() routine is available to provide better numeric string con-
version than atof().
"d_strtol"
From d_strtol.U:
This variable conditionally defines the "HAS_STRTOL" symbol, which indicates to the C
program that the strtol() routine is available to provide better numeric string con-
version than atoi() and friends.
"d_strtold"
From d_strtold.U:
This variable conditionally defines the "HAS_STRTOLD" symbol, which indicates to the C
program that the strtold() routine is available.
"d_strtoll"
From d_strtoll.U:
This variable conditionally defines the "HAS_STRTOLL" symbol, which indicates to the C
program that the strtoll() routine is available.
"d_strtoq"
From d_strtoq.U:
This variable conditionally defines the "HAS_STRTOQ" symbol, which indicates to the C
program that the strtoq() routine is available.
"d_strtoul"
From d_strtoul.U:
This variable conditionally defines the "HAS_STRTOUL" symbol, which indicates to the C
program that the strtoul() routine is available to provide conversion of strings to
unsigned long.
"d_strtoull"
From d_strtoull.U:
This variable conditionally defines the "HAS_STRTOULL" symbol, which indicates to the
C program that the strtoull() routine is available.
"d_strtouq"
From d_strtouq.U:
This variable conditionally defines the "HAS_STRTOUQ" symbol, which indicates to the C
program that the strtouq() routine is available.
"d_strxfrm"
From d_strxfrm.U:
This variable conditionally defines "HAS_STRXFRM" if strxfrm() is available to trans-
form strings.
"d_suidsafe"
From d_dosuid.U:
This variable conditionally defines "SETUID_SCRIPTS_ARE_SECURE_NOW" if setuid scripts
can be secure. This test looks in /dev/fd/.
"d_symlink"
From d_symlink.U:
This variable conditionally defines the "HAS_SYMLINK" symbol, which indicates to the C
program that the symlink() routine is available to create symbolic links.
"d_syscall"
From d_syscall.U:
This variable conditionally defines "HAS_SYSCALL" if syscall() is available call arbi-
trary system calls.
"d_syscallproto"
From d_syscallproto.U:
This variable conditionally defines the "HAS_SYSCALL_PROTO" symbol, which indicates to
the C program that the system provides a prototype for the syscall() function. Other-
wise, it is up to the program to supply one.
"d_sysconf"
From d_sysconf.U:
This variable conditionally defines the "HAS_SYSCONF" symbol, which indicates to the C
program that the sysconf() routine is available to determine system related limits and
options.
"d_sysernlst"
From d_strerror.U:
This variable conditionally defines "HAS_SYS_ERRNOLIST" if sys_errnolist[] is avail-
able to translate error numbers to the symbolic name.
"d_syserrlst"
From d_strerror.U:
This variable conditionally defines "HAS_SYS_ERRLIST" if sys_errlist[] is available to
translate error numbers to strings.
"d_system"
From d_system.U:
This variable conditionally defines "HAS_SYSTEM" if system() is available to issue a
shell command.
"d_tcgetpgrp"
From d_tcgtpgrp.U:
This variable conditionally defines the "HAS_TCGETPGRP" symbol, which indicates to the
C program that the tcgetpgrp() routine is available. to get foreground process group
"ID".
"d_tcsetpgrp"
From d_tcstpgrp.U:
This variable conditionally defines the "HAS_TCSETPGRP" symbol, which indicates to the
C program that the tcsetpgrp() routine is available to set foreground process group
"ID".
"d_telldir"
From d_readdir.U:
This variable conditionally defines "HAS_TELLDIR" if telldir() is available.
"d_telldirproto"
From d_telldirproto.U:
This variable conditionally defines the "HAS_TELLDIR_PROTO" symbol, which indicates to
the C program that the system provides a prototype for the telldir() function. Other-
wise, it is up to the program to supply one.
"d_time"
From d_time.U:
This variable conditionally defines the "HAS_TIME" symbol, which indicates that the
time() routine exists. The time() routine is normaly provided on "UNIX" systems.
"d_times"
From d_times.U:
This variable conditionally defines the "HAS_TIMES" symbol, which indicates that the
times() routine exists. The times() routine is normaly provided on "UNIX" systems.
You may have to include .
"d_tm_tm_gmtoff"
From i_time.U:
This variable conditionally defines "HAS_TM_TM_GMTOFF", which indicates indicates to
the C program that the struct tm has the tm_gmtoff field.
"d_tm_tm_zone"
From i_time.U:
This variable conditionally defines "HAS_TM_TM_ZONE", which indicates indicates to the
C program that the struct tm has the tm_zone field.
"d_tmpnam_r"
From d_tmpnam_r.U:
This variable conditionally defines the "HAS_TMPNAM_R" symbol, which indicates to the
C program that the tmpnam_r() routine is available.
"d_truncate"
From d_truncate.U:
This variable conditionally defines "HAS_TRUNCATE" if truncate() is available to trun-
cate files.
"d_ttyname_r"
From d_ttyname_r.U:
This variable conditionally defines the "HAS_TTYNAME_R" symbol, which indicates to the
C program that the ttyname_r() routine is available.
"d_tzname"
From d_tzname.U:
This variable conditionally defines "HAS_TZNAME" if tzname[] is available to access
timezone names.
"d_u32align"
From d_u32align.U:
This variable tells whether you must access character data through U32-aligned point-
ers.
"d_ualarm"
From d_ualarm.U:
This variable conditionally defines the "HAS_UALARM" symbol, which indicates to the C
program that the ualarm() routine is available.
"d_umask"
From d_umask.U:
This variable conditionally defines the "HAS_UMASK" symbol, which indicates to the C
program that the umask() routine is available. to set and get the value of the file
creation mask.
"d_uname"
From d_gethname.U:
This variable conditionally defines the "HAS_UNAME" symbol, which indicates to the C
program that the uname() routine may be used to derive the host name.
"d_union_semun"
From d_union_semun.U:
This variable conditionally defines "HAS_UNION_SEMUN" if the union semun is defined by
including .
"d_unordered"
From d_unordered.U:
This variable conditionally defines the "HAS_UNORDERED" symbol, which indicates to the
C program that the unordered() routine is available.
"d_unsetenv"
From d_unsetenv.U:
This variable conditionally defines the "HAS_UNSETENV" symbol, which indicates to the
C program that the unsetenv () routine is available.
"d_usleep"
From d_usleep.U:
This variable conditionally defines "HAS_USLEEP" if usleep() is available to do high
granularity sleeps.
"d_usleepproto"
From d_usleepproto.U:
This variable conditionally defines the "HAS_USLEEP_PROTO" symbol, which indicates to
the C program that the system provides a prototype for the usleep() function. Other-
wise, it is up to the program to supply one.
"d_ustat"
From d_ustat.U:
This variable conditionally defines "HAS_USTAT" if ustat() is available to query file
system statistics by dev_t.
"d_vendorarch"
From vendorarch.U:
This variable conditionally defined "PERL_VENDORARCH".
"d_vendorbin"
From vendorbin.U:
This variable conditionally defines "PERL_VENDORBIN".
"d_vendorlib"
From vendorlib.U:
This variable conditionally defines "PERL_VENDORLIB".
"d_vendorscript"
From vendorscript.U:
This variable conditionally defines "PERL_VENDORSCRIPT".
"d_vfork"
From d_vfork.U:
This variable conditionally defines the "HAS_VFORK" symbol, which indicates the
vfork() routine is available.
"d_void_closedir"
From d_closedir.U:
This variable conditionally defines "VOID_CLOSEDIR" if closedir() does not return a
value.
"d_voidsig"
From d_voidsig.U:
This variable conditionally defines "VOIDSIG" if this system declares "void (*sig-
nal(...))()" in signal.h. The old way was to declare it as "int (*signal(...))()".
"d_voidtty"
From i_sysioctl.U:
This variable conditionally defines "USE_IOCNOTTY" to indicate that the ioctl() call
with "TIOCNOTTY" should be used to void tty association. Otherwise (on "USG" proba-
bly), it is enough to close the standard file decriptors and do a setpgrp().
"d_volatile"
From d_volatile.U:
This variable conditionally defines the "HASVOLATILE" symbol, which indicates to the C
program that this C compiler knows about the volatile declaration.
"d_vprintf"
From d_vprintf.U:
This variable conditionally defines the "HAS_VPRINTF" symbol, which indicates to the C
program that the vprintf() routine is available to printf with a pointer to an argu-
ment list.
"d_wait4"
From d_wait4.U:
This variable conditionally defines the HAS_WAIT4 symbol, which indicates the wait4()
routine is available.
"d_waitpid"
From d_waitpid.U:
This variable conditionally defines "HAS_WAITPID" if waitpid() is available to wait
for child process.
"d_wcstombs"
From d_wcstombs.U:
This variable conditionally defines the "HAS_WCSTOMBS" symbol, which indicates to the
C program that the wcstombs() routine is available to convert wide character strings
to multibyte strings.
"d_wctomb"
From d_wctomb.U:
This variable conditionally defines the "HAS_WCTOMB" symbol, which indicates to the C
program that the wctomb() routine is available to convert a wide character to a multi-
byte.
"d_writev"
From d_writev.U:
This variable conditionally defines the "HAS_WRITEV" symbol, which indicates to the C
program that the writev() routine is available.
"d_xenix"
From Guess.U:
This variable conditionally defines the symbol "XENIX", which alerts the C program
that it runs under Xenix.
"date"
From Loc.U:
This variable is used internally by Configure to determine the full pathname (if any)
of the date program. After Configure runs, the value is reset to a plain "date" and
is not useful.
"db_hashtype"
From i_db.U:
This variable contains the type of the hash structure element in the header
file. In older versions of "DB", it was int, while in newer ones it is u_int32_t.
"db_prefixtype"
From i_db.U:
This variable contains the type of the prefix structure element in the header
file. In older versions of "DB", it was int, while in newer ones it is size_t.
"db_version_major"
From i_db.U:
This variable contains the major version number of Berkeley "DB" found in the
header file.
"db_version_minor"
From i_db.U:
This variable contains the minor version number of Berkeley "DB" found in the
header file. For "DB" version 1 this is always 0.
"db_version_patch"
From i_db.U:
This variable contains the patch version number of Berkeley "DB" found in the
header file. For "DB" version 1 this is always 0.
"defvoidused"
From voidflags.U:
This variable contains the default value of the "VOIDUSED" symbol (15).
"direntrytype"
From i_dirent.U:
This symbol is set to "struct direct" or "struct dirent" depending on whether dirent
is available or not. You should use this pseudo type to portably declare your direc-
tory entries.
"dlext"
From dlext.U:
This variable contains the extension that is to be used for the dynamically loaded
modules that perl generaties.
"dlsrc"
From dlsrc.U:
This variable contains the name of the dynamic loading file that will be used with the
package.
"doublesize"
From doublesize.U:
This variable contains the value of the "DOUBLESIZE" symbol, which indicates to the C
program how many bytes there are in a double.
"drand01"
From randfunc.U:
Indicates the macro to be used to generate normalized random numbers. Uses randfunc,
often divided by (double) (((unsigned long) 1 << randbits)) in order to normalize the
result. In C programs, the macro "Drand01" is mapped to drand01.
"drand48_r_proto"
From d_drand48_r.U:
This variable encodes the prototype of drand48_r. It is zero if d_drand48_r is undef,
and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_drand48_r is defined.
"dynamic_ext"
From Extensions.U:
This variable holds a list of "XS" extension files we want to link dynamically into
the package. It is used by Makefile.
e
"eagain"
From nblock_io.U:
This variable bears the symbolic errno code set by read() when no data is present on
the file and non-blocking I/O was enabled (otherwise, read() blocks naturally).
"ebcdic"
From ebcdic.U:
This variable conditionally defines "EBCDIC" if this system uses "EBCDIC" encoding.
Among other things, this means that the character ranges are not contiguous. See
trnl.U
"echo"
From Loc.U:
This variable is used internally by Configure to determine the full pathname (if any)
of the echo program. After Configure runs, the value is reset to a plain "echo" and
is not useful.
"egrep"
From Loc.U:
This variable is used internally by Configure to determine the full pathname (if any)
of the egrep program. After Configure runs, the value is reset to a plain "egrep" and
is not useful.
"emacs"
From Loc.U:
This variable is defined but not used by Configure. The value is a plain '' and is
not useful.
"endgrent_r_proto"
From d_endgrent_r.U:
This variable encodes the prototype of endgrent_r. It is zero if d_endgrent_r is
undef, and one of the "REENTRANT_PROTO_T_ABC" macros of reentr.h if d_endgrent_r is
defined.
"endhostent_r_proto"
From d_
|