GETSID
Section: Linux Programmer's Manual (2)
Updated: 2010-09-26
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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 ||
_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)
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ERRORS
-
- VERSIONS
-
- CONFORMING TO
-
- NOTES
-
- SEE ALSO
-
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