2004-11-03 13:51:07 +00:00
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.\" Copyright (C) 1996 Andries Brouwer (aeb@cwi.nl)
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.\"
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.\" This is free documentation; you can redistribute it and/or
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.\" modify it under the terms of the GNU General Public License as
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.\" published by the Free Software Foundation; either version 2 of
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.\" the License, or (at your option) any later version.
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.\"
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.\" The GNU General Public License's references to "object code"
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.\" and "executables" are to be interpreted as the output of any
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.\" document formatting or typesetting system, including
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.\" intermediate and printed output.
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.\"
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.\" This manual is distributed in the hope that it will be useful,
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.\" but WITHOUT ANY WARRANTY; without even the implied warranty of
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.\" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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.\" GNU General Public License for more details.
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.\"
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.\" You should have received a copy of the GNU General Public
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.\" License along with this manual; if not, write to the Free
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.\" Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111,
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.\" USA.
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.\"
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.\" Modified Thu Oct 31 14:18:40 1996 by Eric S. Raymond <esr@y\thyrsus.com>
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.\" Modified 2001-12-17, aeb
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2007-05-30 05:36:26 +00:00
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.TH GETSID 2 2001-12-17 "Linux" "Linux Programmer's Manual"
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2004-11-03 13:51:07 +00:00
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.SH NAME
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getsid \- get session ID
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.SH SYNOPSIS
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.B #include <unistd.h>
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.sp
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.BI "pid_t getsid(pid_t" " pid" );
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.SH DESCRIPTION
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2005-11-02 10:53:26 +00:00
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.I getsid(0)
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2004-11-03 13:51:07 +00:00
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returns the session ID of the calling process.
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2005-11-02 10:53:26 +00:00
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.I getsid(p)
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2004-11-03 13:51:07 +00:00
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returns the session ID of the process with process ID
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.IR p .
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(The session ID of a process is the process group ID of the
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session leader.)
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2007-05-26 12:19:40 +00:00
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.SH RETIRN VALUE
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On success, a session ID is returned.
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2004-11-03 13:51:07 +00:00
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On error, (pid_t) \-1 will be returned, and
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.I errno
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is set appropriately.
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.SH ERRORS
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.TP
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.B EPERM
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A process with process ID
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.I p
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exists, but it is not in the same session as the current process,
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and the implementation considers this an error.
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.TP
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.B ESRCH
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No process with process ID
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.I p
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was found.
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.SH "CONFORMING TO"
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2006-08-03 13:57:17 +00:00
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SVr4, POSIX.1-2001.
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2004-11-03 13:51:07 +00:00
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.SH NOTES
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Linux does not return EPERM.
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.LP
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Linux has this system call since Linux 1.3.44.
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There is libc support since libc 5.2.19.
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.LP
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To get the prototype under glibc, define both _XOPEN_SOURCE and
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_XOPEN_SOURCE_EXTENDED, or use "#define _XOPEN_SOURCE \fIn\fP"
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for some integer \fIn\fP larger than or equal to 500.
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.SH "SEE ALSO"
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.BR getpgid (2),
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2006-04-21 06:49:34 +00:00
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.BR setsid (2),
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2007-06-08 07:57:18 +00:00
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.BR credentials (7),
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2006-05-15 09:13:10 +00:00
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.BR feature_test_macros (7)
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