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getsid.2: Rework description to be somewhat clearer 

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
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Michael Kerrisk 2016-09-12 07:09:29 +01:00
parent 1986f06518
commit 3d8af60347
1 changed files with 12 additions and 4 deletions
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man2/getsid.2
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@ -1,4 +1,5 @@
.\" Copyright (C) 1996 Andries Brouwer (aeb@cwi.nl) .\" Copyright (C) 1996 Andries Brouwer (aeb@cwi.nl)
.\" and Copyright (C) 2016 Michael Kerrisk <mtk.manpages@gmail.com>
.\" .\"
.\" %%%LICENSE_START(GPLv2+_DOC_FULL) .\" %%%LICENSE_START(GPLv2+_DOC_FULL)
.\" This is free documentation; you can redistribute it and/or .\" This is free documentation; you can redistribute it and/or
@ -50,11 +51,14 @@ _XOPEN_SOURCE\ >=\ 500
.SH DESCRIPTION .SH DESCRIPTION
.I getsid(0) .I getsid(0)
returns the session ID of the calling process. returns the session ID of the calling process.
.I getsid(p) .BR getsid ()
returns the session ID of the process with process ID returns the session ID of the process with process ID
.IR p . .IR pid .
(The session ID of a process is the process ID of the If
session leader.) .I pid
is 0,
.BR getsid ()
returns the session ID of the calling process.
.SH RETURN VALUE .SH RETURN VALUE
On success, a session ID is returned. On success, a session ID is returned.
On error, \fI(pid_t)\ \-1\fP will be returned, and On error, \fI(pid_t)\ \-1\fP will be returned, and
@ -81,6 +85,10 @@ POSIX.1-2001, POSIX.1-2008, SVr4.
.SH NOTES .SH NOTES
Linux does not return Linux does not return
.BR EPERM . .BR EPERM .
See
.BR credentials (7)
for a description of sessions and session IDs.
.SH SEE ALSO .SH SEE ALSO
.BR getpgid (2), .BR getpgid (2),
.BR setsid (2), .BR setsid (2),