capabilities.7: Add a note about using strace on binaries that have capabilities

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

diff --git a/man2/getsid.2 b/man2/getsid.2
index 42c82b1e77eae584cf6289f19bea369e0814baca..a912b651fb9f52c671c1f566c4df3d09f21fd009 100644 (file)
--- a/man2/getsid.2
+++ b/man2/getsid.2
@@ -1,5 +1,7 @@
 .\" 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
 .\" modify it under the terms of the GNU General Public License as
 .\" published by the Free Software Foundation; either version 2 of
@@ -16,44 +18,49 @@
 .\" 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, write to the Free
-.\" Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111,
-.\" USA.
+.\" 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"
+.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
@@ -63,24 +70,28 @@ 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.
+.SH CONFORMING TO
+POSIX.1-2001, POSIX.1-2008, SVr4.
 .SH NOTES
 Linux does not return
 .BR EPERM .
-.SH "SEE ALSO"
+.PP
+See
+.BR credentials (7)
+for a description of sessions and session IDs.
+.SH SEE ALSO
 .BR getpgid (2),
 .BR setsid (2),
 .BR credentials (7)