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[linuxjm/LDP_man-pages.git] / original / man2 / getsid.2

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-.\" Copyright (C) 1996 Andries Brouwer (aeb@cwi.nl)
-.\"
-.\" %%%LICENSE_START(GPLv2+_DOC_FULL)
-.\" This is free documentation; you can redistribute it and/or
-.\" modify it under the terms of the GNU General Public License as
-.\" published by the Free Software Foundation; either version 2 of
-.\" the License, or (at your option) any later version.
-.\"
-.\" The GNU General Public License's references to "object code"
-.\" and "executables" are to be interpreted as the output of any
-.\" document formatting or typesetting system, including
-.\" intermediate and printed output.
-.\"
-.\" This manual is distributed in the hope that it will be useful,
-.\" but WITHOUT ANY WARRANTY; without even the implied warranty of
-.\" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-.\" GNU General Public License for more details.
-.\"
-.\" You should have received a copy of the GNU General Public
-.\" License along with this manual; if not, see
-.\" <http://www.gnu.org/licenses/>.
-.\" %%%LICENSE_END
-.\"
-.\" Modified Thu Oct 31 14:18:40 1996 by Eric S. Raymond <esr@y\thyrsus.com>
-.\" Modified 2001-12-17, aeb
-.TH GETSID 2 2010-09-26 "Linux" "Linux Programmer's Manual"
-.SH NAME
-getsid \- get session ID
-.SH SYNOPSIS
-.B #include <unistd.h>
-.sp
-.BI "pid_t getsid(pid_t" " pid" );
-.sp
-.in -4n
-Feature Test Macro Requirements for glibc (see
-.BR feature_test_macros (7)):
-.in
-.sp
-.ad l
-.PD 0
-.BR getsid ():
-.RS 4
-_XOPEN_SOURCE\ >=\ 500 ||
-_XOPEN_SOURCE\ &&\ _XOPEN_SOURCE_EXTENDED
-.br
-|| /* Since glibc 2.12: */ _POSIX_C_SOURCE\ >=\ 200809L
-.RE
-.PD
-.ad
-.SH DESCRIPTION
-.I getsid(0)
-returns the session ID of the calling process.
-.I getsid(p)
-returns the session ID of the process with process ID
-.IR p .
-(The session ID of a process is the process group ID of the
-session leader.)
-.SH RETURN VALUE
-On success, a session ID is returned.
-On error, \fI(pid_t)\ \-1\fP will be returned, and
-.I errno
-is set appropriately.
-.SH ERRORS
-.TP
-.B EPERM
-A process with process ID
-.I p
-exists, but it is not in the same session as the calling process,
-and the implementation considers this an error.
-.TP
-.B ESRCH
-No process with process ID
-.I p
-was found.
-.SH VERSIONS
-This system call is available on Linux since version 2.0.
-.\" Linux has this system call since Linux 1.3.44.
-.\" There is libc support since libc 5.2.19.
-.SH CONFORMING TO
-SVr4, POSIX.1-2001.
-.SH NOTES
-Linux does not return
-.BR EPERM .
-.SH SEE ALSO
-.BR getpgid (2),
-.BR setsid (2),
-.BR credentials (7)
-.SH COLOPHON
-This page is part of release 3.79 of the Linux
-.I man-pages
-project.
-A description of the project,
-information about reporting bugs,
-and the latest version of this page,
-can be found at
-\%http://www.kernel.org/doc/man\-pages/.