GETSID - reference manual online

Get session ID.

GETSID(2)                           Linux Programmer's Manual                           GETSID(2)

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 || _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED || /* Since glibc 2.12: */ _POSIX_C_SOURCE >= 200809L
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 call‐ ing 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.
NOTES Linux does not return EPERM.
SEE ALSO getpgid(2), setsid(2), credentials(7)
COLOPHON This page is part of release 4.04 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at
Linux 2015-08-08 GETSID(2)
This manual Reference Other manuals
getsid(2) referred by cr_restart(1) | credentials(7) | getpgid(2freebsd) | getpgrp(2freebsd) | getsid(2freebsd) | procenv(1) | ps(1) | sd_pid_get_session(3) | setsid(2) | syscalls(2) | tcgetsid(3) | utmp(5)
refer to credentials(7) | feature_test_macros(7) | setpgid(2) | setsid(2)