GETSID(2)                           Linux Programmer's Manual                           GETSID(2)



NAME
       getsid - get session ID

SYNOPSIS
       #include 

       pid_t getsid(pid_t pid);

DESCRIPTION
       getsid(0) returns the session ID of the calling process.  getsid(p) returns the session ID
       of the process with process ID p.  (The session ID of a process is the process group ID of
       the  session  leader.)   On error, (pid_t) -1 will be returned, and errno is set appropri-
       ately.

ERRORS
       EPERM  A process with process ID p exists, but it is not in the same session as  the  cur-
              rent process, and the implementation considers this an error.

       ESRCH  No process with process ID p was found.

CONFORMING TO
       SVr4, POSIX 1003.1-2001.

NOTES
       Linux does not return EPERM.

       Linux has this system call since Linux 1.3.44.  There is libc support since libc 5.2.19.

       To get the prototype under glibc, define both _XOPEN_SOURCE and _XOPEN_SOURCE_EXTENDED, or
       use "#define _XOPEN_SOURCE n" for some integer n larger than or equal to 500.

SEE ALSO
       getpgid(2), setsid(2)



Linux 2.5.0                                 2001-12-17                                  GETSID(2)