focal (2) getsid.2.gz

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NAME

       getsid - get session ID

SYNOPSIS

       #include <sys/types.h>
       #include <unistd.h>

       pid_t getsid(pid_t pid);

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

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

DESCRIPTION

       getsid(0)  returns the session ID of the calling process.  getsid() returns the session ID of the process
       with process ID pid.  If pid is 0, getsid() returns the session ID of the calling process.

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 pid 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 pid was found.

VERSIONS

       This system call is available on Linux since version 2.0.

CONFORMING TO

       POSIX.1-2001, POSIX.1-2008, SVr4.

NOTES

       Linux does not return EPERM.

       See credentials(7) for a description of sessions and session IDs.

SEE ALSO

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

COLOPHON

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