Tty(3)                         User Contributed Perl Documentation                         Tty(3)



NAME
       IO::Tty - Low-level allocate a pseudo-Tty, import constants.

VERSION
       1.07

SYNOPSIS
           use IO::Tty qw(TIOCNOTTY);
           ...
           # use only to import constants, see IO::Pty to create ptys.

DESCRIPTION
       "IO::Tty" is used internally by "IO::Pty" to create a pseudo-tty.  You wouldn't want to
       use it directly except to import constants, use "IO::Pty".  For a list of importable con-
       stants, see IO::Tty::Constant.

       Windows is now supported, but ONLY under the Cygwin environment, see <http://sources.red-
       hat.com/cygwin/>.

       Please note that pty creation is very system-dependend.  From my experience, any modern
       POSIX system should be fine.  Find below a list of systems that "IO::Tty" should work on.
       A more detailed table (which is slowly getting out-of-date) is available from the project
       pages document manager at SourceForge <http://sourceforge.net/projects/expectperl/>.

       If you have problems on your system and your system is listed in the "verified" list, you
       probably have some non-standard setup, e.g. you compiled your Linux-kernel yourself and
       disabled ptys (bummer!).  Please ask your friendly sysadmin for help.

       If your system is not listed, unpack the latest version of "IO::Tty", do a 'perl Make-
       file.PL; make; make test; uname -a' and send me () the results and I'll
       see what I can deduce from that.  There are chances that it will work right
       out-of-the-box...

       If it's working on your system, please send me a short note with details (version number,
       distribution, etc. 'uname -a' and 'perl -V' is a good start; also, the output from "perl
       Makefile.PL" contains a lot of interesting info, so please include that as well) so I can
       get an overview.  Thanks!

VERIFIED SYSTEMS, KNOWN ISSUES
       This is a list of systems that "IO::Tty" seems to work on ('make test' passes) with com-
       ments about "features":

       * AIX 4.3
           Returns EIO instead of EOF when the slave is closed.  Benign.

       * AIX 5.x
       * FreeBSD 4.4
           EOF on the slave tty is not reported back to the master.

       * OpenBSD 2.8
           The ioctl TIOCSCTTY sometimes fails.  This is also known in Tcl/Expect, see
           http://expect.nist.gov/FAQ.html

           EOF on the slave tty is not reported back to the master.

       * Darwin 7.9.0
       * HPUX 10.20 & 11.00
           EOF on the slave tty is not reported back to the master.

       * IRIX 6.5
       * Linux 2.2.x & 2.4.x
           Returns EIO instead of EOF when the slave is closed.  Benign.

       * OSF 4.0
           EOF on the slave tty is not reported back to the master.

       * Solaris 8, 2.7, 2.6
           Has the "feature" of returning EOF just once?!

           EOF on the slave tty is not reported back to the master.

       * Windows NT/2k/XP (under Cygwin)
           When you send (print) a too long line (>160 chars) to a non-raw pty, the call just
           hangs forever and even alarm() cannot get you out.  Don't complain to me...

           EOF on the slave tty is not reported back to the master.

       * z/OS

       The following systems have not been verified yet for this version, but a previous version
       worked on them:

       * SCO Unix
       * NetBSD
           probably the same as the other *BSDs...

       If you have additions to these lists, please mail them to <>.

SEE ALSO
       IO::Pty, IO::Tty::Constant

MAILING LISTS
       As this module is mainly used by Expect, support for it is available via the two Expect
       mailing lists, expectperl-announce and expectperl-discuss, at

         http://lists.sourceforge.net/lists/listinfo/expectperl-announce

       and

         http://lists.sourceforge.net/lists/listinfo/expectperl-discuss

AUTHORS
       Originally by Graham Barr <>, based on the Ptty module by Nick Ing-Simmons
       <>.

       Now maintained and heavily rewritten by Roland Giersig <>.

       Contains copyrighted stuff from openssh v3.0p1, authored by Tatu Ylonen <>,
       Markus Friedl and Todd C. Miller <>.  I also got a lot of inspiry
       from the pty code in Xemacs.

COPYRIGHT
       Now all code is free software; you can redistribute it and/or modify it under the same
       terms as Perl itself.

       Nevertheless the above AUTHORS retain their copyrights to the various parts and want to
       receive credit if their source code is used.  See the source for details.

DISCLAIMER
       THIS SOFTWARE IS PROVIDED ''AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT
       NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
       PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
       INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
       PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
       INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
       LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
       OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

       In other words: Use at your own risk.  Provided as is.  Your mileage may vary.  Read the
       source, Luke!

       And finally, just to be sure:

       Any Use of This Product, in Any Manner Whatsoever, Will Increase the Amount of Disorder in
       the Universe. Although No Liability Is Implied Herein, the Consumer Is Warned That This
       Process Will Ultimately Lead to the Heat Death of the Universe.



perl v5.8.8                                 2007-07-13                                     Tty(3)