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NAME

       getsid - get session ID

SYNOPSIS

       #include <unistd.h>

       pid_t getsid(pid_t pid);

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

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

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.)

RETURN VALUE

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

ERRORS

       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

       This system call is available on Linux since version 2.0.

CONFORMING TO

       SVr4, POSIX.1-2001.

NOTES

       Linux does not return EPERM.

SEE ALSO

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

COLOPHON

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