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[thirdparty/man-pages.git] / man2 / getsid.2

diff --git a/man2/getsid.2 b/man2/getsid.2
index b52c3e59e573353f3bb10af0649be7eacd48d3a0..a912b651fb9f52c671c1f566c4df3d09f21fd009 100644 (file)
--- a/man2/getsid.2
+++ b/man2/getsid.2
@@ -1,4 +1,5 @@
 .\" Copyright (C) 1996 Andries Brouwer (aeb@cwi.nl)
+.\" and Copyright (C) 2016 Michael Kerrisk <mtk.manpages@gmail.com>
 .\"
 .\" %%%LICENSE_START(GPLv2+_DOC_FULL)
 .\" This is free documentation; you can redistribute it and/or
@@ -23,38 +24,43 @@
 .\"
 .\" 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"
+.TH GETSID 2 2017-09-15 "Linux" "Linux Programmer's Manual"
 .SH NAME
 getsid \- get session ID
 .SH SYNOPSIS
+.B #include <sys/types.h>
+.br
 .B #include <unistd.h>
-.sp
+.PP
 .BI "pid_t getsid(pid_t" " pid" );
-.sp
+.PP
 .in -4n
 Feature Test Macro Requirements for glibc (see
 .BR feature_test_macros (7)):
 .in
-.sp
+.PP
 .ad l
 .PD 0
 .BR getsid ():
 .RS 4
-_XOPEN_SOURCE\ >=\ 500 ||
-_XOPEN_SOURCE\ &&\ _XOPEN_SOURCE_EXTENDED
+_XOPEN_SOURCE\ >=\ 500
+.\"    || _XOPEN_SOURCE\ &&\ _XOPEN_SOURCE_EXTENDED
 .br
-|| /* Since glibc 2.12: */ _POSIX_C_SOURCE\ >=\ 200809L
+    || /* 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)
+.BR getsid ()
 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.)
+.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 will be returned, and
@@ -64,23 +70,27 @@ is set appropriately.
 .TP
 .B EPERM
 A process with process ID
-.I p
+.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 p
+.I pid
 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.
+POSIX.1-2001, POSIX.1-2008, SVr4.
 .SH NOTES
 Linux does not return
 .BR EPERM .
+.PP
+See
+.BR credentials (7)
+for a description of sessions and session IDs.
 .SH SEE ALSO
 .BR getpgid (2),
 .BR setsid (2),