GETSID

Section: Linux Programmer's Manual (2)
Updated: 2008-12-05
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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

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.

COLOPHON

This page is part of release 3.22 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.