getsid
Section: System Calls (2)
Updated: 2022-12-04
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NAME
getsid - get session ID
LIBRARY
Standard C library
(libc, -lc)
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
|| /* Since glibc 2.12: */ _POSIX_C_SOURCE >= 200809L
DESCRIPTION
getsid()
returns the session ID of the process with process ID
pid.
If
pid
is 0,
getsid()
returns the session ID of the calling process.
RETURN VALUE
On success, a session ID is returned.
On error, (pid_t) -1 is returned, and
errno
is set to indicate the error.
ERRORS
- EPERM
-
A process with process ID
pid
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
pid
was found.
VERSIONS
This system call is available since Linux 2.0.
STANDARDS
POSIX.1-2001, POSIX.1-2008, SVr4.
NOTES
Linux does not return
EPERM.
See
credentials(7)
for a description of sessions and session IDs.
SEE ALSO
getpgid(2),
setsid(2),
credentials(7)
Index
- NAME
-
- LIBRARY
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ERRORS
-
- VERSIONS
-
- STANDARDS
-
- NOTES
-
- SEE ALSO
-
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