Linux manual pages Section 2  

Name

getsid — get session ID

Synopsis

#include <unistd.h>
pid_t getsid( pid_t pid);
 
[Note] Note
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 calling 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.

CONFORMING TO

SVr4, POSIX.1-2001.

NOTES

Linux does not return EPERM.

SEE ALSO

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

COLOPHON

This page is part of release 3.33 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://man7.org/linux/man-pages/.


  Copyright (C) 1996 Andries Brouwer (aebcwi.nl)

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Modified Thu Oct 31 14:18:40 1996 by Eric S. Raymond <esry\thyrsus.com>
Modified 2001-12-17, aeb