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
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 3.25 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/.