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 25d1ef5e2d33efd1f4d01d78902a4baaf7e31ecc..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
@@ -23,19 +24,21 @@
 .\"
 .\" Modified Thu Oct 31 14:18:40 1996 by Eric S. Raymond <esr@y\thyrsus.com>
 .\" Modified 2001-12-17, aeb
-.TH GETSID 2 2015-08-08 "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 ():
@@ -50,11 +53,14 @@ _XOPEN_SOURCE\ >=\ 500
 .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
@@ -64,13 +70,13 @@ 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.
@@ -81,6 +87,10 @@ 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),