Document getsid(2).

lib/libc/sys/getsid.2

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+.\"	$NetBSD: getsid.2,v 1.1 1998/02/14 01:38:21 thorpej Exp $
+.\"
+.\" Copyright (c) 1983, 1991, 1993
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+.\"     @(#)getpgrp.2	8.1 (Berkeley) 6/4/93
+.\"
+.Dd February 13, 1998
+.Dt GETSID 2
+.Os
+.Sh NAME
+.Nm getsid
+.Nd get session ID
+.Sh SYNOPSIS
+.Fd #include <unistd.h>
+.Ft pid_t
+.Fn getsid "pid_t pid"
+.Sh DESCRIPTION
+The
+.Nm
+function returns the session ID of the process specified by
+.Ar pid .
+If
+.Ar pid
+is 0, the session ID of the calling process is returned.
+The session ID is defined as the process group ID of the
+process that is the session leader.
+.Sh ERRORS
+If an error occurs,
+.Nm
+returns -1 and the global variable
+.Va errno
+is set to indicate the error, as follows:
+.Bl -tag -width Er 
+.It Bq Er ESRCH
+No process can be found corresponding to that specified by
+.Ar pid .
+.Sh SEE ALSO
+.Xr getpgid 2 ,
+.Xr termios 4
+.Sh STANDARDS
+The
+.Fn getsid
+function conforms to
+.St -xpg4.2 .