mirror of https://github.com/mkerrisk/man-pages
93 lines
2.6 KiB
Groff
93 lines
2.6 KiB
Groff
.\" Copyright (C) 1996 Andries Brouwer (aeb@cwi.nl)
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.\" and Copyright (C) 2016 Michael Kerrisk <mtk.manpages@gmail.com>
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.\"
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.\" %%%LICENSE_START(GPLv2+_DOC_FULL)
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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, see
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.\" <http://www.gnu.org/licenses/>.
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.\" %%%LICENSE_END
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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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.TH GETSID 2 2021-03-22 "Linux" "Linux Programmer's Manual"
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.SH NAME
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getsid \- get session ID
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.SH SYNOPSIS
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.nf
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.B #include <unistd.h>
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.PP
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.BI "pid_t getsid(pid_t" " pid" );
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.fi
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.PP
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.RS -4
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Feature Test Macro Requirements for glibc (see
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.BR feature_test_macros (7)):
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.RE
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.PP
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.BR getsid ():
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.nf
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_XOPEN_SOURCE >= 500
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.\" || _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED
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|| /* Since glibc 2.12: */ _POSIX_C_SOURCE >= 200809L
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.fi
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.SH DESCRIPTION
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.I getsid(0)
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returns the session ID of the calling process.
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.BR getsid ()
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returns the session ID of the process with process ID
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.IR pid .
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If
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.I pid
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is 0,
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.BR getsid ()
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returns the session ID of the calling process.
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.SH RETURN VALUE
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On success, a session ID is returned.
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On error, \fI(pid_t)\ \-1\fP is returned, and
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.I errno
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is set to indicate the error.
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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 pid
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exists, but it is not in the same session as the calling 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 pid
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was found.
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.SH VERSIONS
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This system call is available on Linux since version 2.0.
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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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.SH CONFORMING TO
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POSIX.1-2001, POSIX.1-2008, SVr4.
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.SH NOTES
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Linux does not return
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.BR EPERM .
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.PP
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See
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.BR credentials (7)
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for a description of sessions and session IDs.
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.SH SEE ALSO
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.BR getpgid (2),
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.BR setsid (2),
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.BR credentials (7)
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