getsid(2) - Linux manual page (original) (raw)

getsid(2) System Calls Manual getsid(2)

NAME top

   getsid - get session ID

LIBRARY top

   Standard C library (_libc_, _-lc_)

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
           || /* Since glibc 2.12: */ _POSIX_C_SOURCE >= 200809L

DESCRIPTION top

   **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 top

   On success, a session ID is returned.  On error, _(pidt) -1_ is
   returned, and _[errno](../man3/errno.3.html)_ is set to indicate the error.

ERRORS top

   **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 top

   Linux does not return **EPERM**.

STANDARDS top

   POSIX.1-2008.

HISTORY top

   POSIX.1-2001, SVr4.  Linux 2.0.

NOTES top

   See [credentials(7)](../man7/credentials.7.html) for a description of sessions and session IDs.

SEE ALSO top

   [getpgid(2)](../man2/getpgid.2.html), [setsid(2)](../man2/setsid.2.html), [credentials(7)](../man7/credentials.7.html)

COLOPHON top

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Linux man-pages 6.10 2024-07-23 getsid(2)

Pages that refer to this page:ps(1), setsid(2), syscalls(2), id_t(3type), sd_pid_get_owner_uid(3), tcgetsid(3), utmp(5), credentials(7)