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-.\" Copyright (C) 1996 Andries Brouwer (aeb@cwi.nl)
-.\" and Copyright (C) 2016 Michael Kerrisk <mtk.manpages@gmail.com>
-.\"
-.\" SPDX-License-Identifier: GPL-2.0-or-later
-.\"
-.\" Modified Thu Oct 31 14:18:40 1996 by Eric S. Raymond <esr@y\thyrsus.com>
-.\" Modified 2001-12-17, aeb
-.TH getsid 2 2023-10-31 "Linux man-pages 6.7"
-.SH NAME
-getsid \- get session ID
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B #include <unistd.h>
-.P
-.BI "pid_t getsid(pid_t" " pid" );
-.fi
-.P
-.RS -4
-Feature Test Macro Requirements for glibc (see
-.BR feature_test_macros (7)):
-.RE
-.P
-.BR getsid ():
-.nf
- _XOPEN_SOURCE >= 500
-.\" || _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED
- || /* Since glibc 2.12: */ _POSIX_C_SOURCE >= 200809L
-.fi
-.SH DESCRIPTION
-.BR getsid ()
-returns the session ID of the process with process ID
-.IR pid .
-If
-.I pid
-is 0,
-.BR getsid ()
-returns the session ID of the calling process.
-.SH RETURN VALUE
-On success, a session ID is returned.
-On error, \fI(pid_t)\ \-1\fP is returned, and
-.I errno
-is set to indicate the error.
-.SH ERRORS
-.TP
-.B EPERM
-A process with process ID
-.I pid
-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 pid
-was found.
-.SH VERSIONS
-Linux does not return
-.BR EPERM .
-.SH STANDARDS
-POSIX.1-2008.
-.SH HISTORY
-POSIX.1-2001, SVr4.
-Linux 2.0.
-.\" Linux has this system call since Linux 1.3.44.
-.\" There is libc support since libc 5.2.19.
-.SH NOTES
-See
-.BR credentials (7)
-for a description of sessions and session IDs.
-.SH SEE ALSO
-.BR getpgid (2),
-.BR setsid (2),
-.BR credentials (7)