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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(): _XOPEN_SOURCE >= 500

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.

CONFORMING TO

       SVr4, POSIX.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.

SEE ALSO

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

COLOPHON

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