Movatterモバイル変換

getsid(2) — Linux manual page

getsid(2)                  System Calls Manualgetsid(2)

NAME        top

       getsid - get session ID

LIBRARY        top

       Standard C library (libc,-lc)

SYNOPSIS        top

#include <unistd.h>pid_t getsid(pid_tpid);   Feature Test Macro Requirements for glibc (seefeature_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 IDpid.  Ifpid is 0,getsid() returns the session ID of the calling       process.

RETURN VALUE        top

       On success, a session ID is returned.  On error,(pid_t) -1 is       returned, anderrno is set to indicate the error.

ERRORS        top

EPERMA process with process IDpid exists, but it is not in the              same session as the calling process, and the implementation              considers this an error.ESRCHNo process with process IDpid was found.

VERSIONS        top

       Linux does not returnEPERM.

STANDARDS        top

       POSIX.1-2008.

HISTORY        top

       POSIX.1-2001, SVr4.  Linux 2.0.

NOTES        top

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

SEE ALSO        top

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

COLOPHON        top

       This page is part of theman-pages (Linux kernel and C library       user-space interface documentation) project.  Information about       the project can be found at        ⟨https://www.kernel.org/doc/man-pages/⟩.  If you have a bug report       for this manual page, see       ⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.       This page was obtained from the tarball man-pages-6.15.tar.gz       fetched from       ⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on       2025-08-11.  If you discover any rendering problems in this HTML       version of the page, or you believe there is a better or more up-       to-date source for the page, or you have corrections or       improvements to the information in this COLOPHON (which isnot       part of the original manual page), send a mail to       man-pages@man7.orgLinux man-pages 6.15            2025-05-17getsid(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)

HTML rendering created 2025-09-06 byMichael Kerrisk, author ofThe Linux Programming Interface. For details of in-depthLinux/UNIX system programming training courses that I teach, lookhere. Hosting byjambit GmbH.