NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | VERSIONS | CONFORMING TO | NOTES | SEE ALSO | COLOPHON

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

NAME         top

       getsid - get session ID

SYNOPSIS         top

       #include <unistd.h>

       pid_t getsid(pid_t pid);

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       getsid():
           _XOPEN_SOURCE >= 500 || _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED
           || /* Since glibc 2.12: */ _POSIX_C_SOURCE >= 200809L

DESCRIPTION         top

       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.)

RETURN VALUE         top

       On success, a session ID is returned.  On error, (pid_t) -1 will be
       returned, and errno is set appropriately.

ERRORS         top

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

       ESRCH  No process with process ID p was found.

VERSIONS         top

       This system call is available on Linux since version 2.0.

CONFORMING TO         top

       SVr4, POSIX.1-2001.

NOTES         top

       Linux does not return EPERM.

SEE ALSO         top

       getpgid(2), setsid(2), credentials(7)

COLOPHON         top

       This page is part of release 3.75 of the Linux man-pages project.  A
       description of the project, information about reporting bugs, and the
       latest version of this page, can be found at
       http://www.kernel.org/doc/man-pages/.

Linux                            2010-09-26                        GETSID(2)