1 .\" Copyright (C) 1996 Andries Brouwer (aeb@cwi.nl)
3 .\" This is free documentation; you can redistribute it and/or
4 .\" modify it under the terms of the GNU General Public License as
5 .\" published by the Free Software Foundation; either version 2 of
6 .\" the License, or (at your option) any later version.
8 .\" The GNU General Public License's references to "object code"
9 .\" and "executables" are to be interpreted as the output of any
10 .\" document formatting or typesetting system, including
11 .\" intermediate and printed output.
13 .\" This manual is distributed in the hope that it will be useful,
14 .\" but WITHOUT ANY WARRANTY; without even the implied warranty of
15 .\" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 .\" GNU General Public License for more details.
18 .\" You should have received a copy of the GNU General Public
19 .\" License along with this manual; if not, write to the Free
20 .\" Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111,
23 .\" Modified Thu Oct 31 14:18:40 1996 by Eric S. Raymond <esr@y\thyrsus.com>
24 .\" Modified 2001-12-17, aeb
25 .TH GETSID 2 2010-09-26 "Linux" "Linux Programmer's Manual"
27 getsid \- get session ID
29 .B #include <unistd.h>
31 .BI "pid_t getsid(pid_t" " pid" );
34 Feature Test Macro Requirements for glibc (see
35 .BR feature_test_macros (7)):
42 _XOPEN_SOURCE\ >=\ 500 ||
43 _XOPEN_SOURCE\ &&\ _XOPEN_SOURCE_EXTENDED
45 || /* Since glibc 2.12: */ _POSIX_C_SOURCE\ >=\ 200809L
51 returns the session ID of the calling process.
53 returns the session ID of the process with process ID
55 (The session ID of a process is the process group ID of the
58 On success, a session ID is returned.
59 On error, \fI(pid_t)\ \-1\fP will be returned, and
65 A process with process ID
67 exists, but it is not in the same session as the calling process,
68 and the implementation considers this an error.
71 No process with process ID
75 This system call is available on Linux since version 2.0.
76 .\" Linux has this system call since Linux 1.3.44.
77 .\" There is libc support since libc 5.2.19.