add getsid(2), XPG4

2 files changed, 84 insertions, 2 deletions

diff --git a/lib/libc/sys/Makefile.inc b/lib/libc/sys/Makefile.inc
index b3af836f35c..4aa099044a7 100644
--- a/lib/libc/sys/Makefile.inc
+++ b/lib/libc/sys/Makefile.inc
@@ -1,4 +1,4 @@
-#	$OpenBSD: Makefile.inc,v 1.23 1997/05/30 21:53:10 kstailey Exp $
+#	$OpenBSD: Makefile.inc,v 1.24 1997/11/13 07:11:13 deraadt Exp $
 #	$NetBSD: Makefile.inc,v 1.35 1995/10/16 23:49:07 jtc Exp $
 #	@(#)Makefile.inc	8.1 (Berkeley) 6/17/93
 
@@ -25,6 +25,7 @@ ASM=	accept.o access.o acct.o adjtime.o bind.o chdir.o chflags.o chmod.o \
 	getfh.o getfsstat.o getgid.o getgroups.o getitimer.o getpeername.o \
 	getpgid.o \
 	getpgrp.o getpid.o getppid.o getpriority.o getrlimit.o getrusage.o \
+	getsid.o \
 	getsockname.o getsockopt.o gettimeofday.o getuid.o issetugid.o \
 	ioctl.o kill.o \
 	ktrace.o lchown.o lfs_bmapv.o lfs_markv.o lfs_segclean.o lfs_segwait.o \
@@ -116,7 +117,7 @@ MAN+=	accept.2 access.2 acct.2 adjtime.2 bind.2 brk.2 chdir.2 chflags.2 \
 	execve.2 _exit.2 fcntl.2 flock.2 fork.2 fsync.2 getdirentries.2 \
 	getfh.2 getfsstat.2 \
 	getgid.2 getgroups.2 getitimer.2 getlogin.2 getpeername.2 getpgrp.2 \
-	getpid.2 getpriority.2 getrlimit.2 getrusage.2 getsockname.2 \
+	getpid.2 getpriority.2 getrlimit.2 getrusage.2 getsid.2 getsockname.2 \
 	getsockopt.2 gettimeofday.2 getuid.2 intro.2 issetugid.2 ioctl.2 \
 	kill.2 ktrace.2 link.2 \
 	listen.2 lseek.2 mkdir.2 mkfifo.2 mknod.2 madvise.2 mincore.2 \
diff --git a/lib/libc/sys/getsid.2 b/lib/libc/sys/getsid.2
new file mode 100644
index 00000000000..a25e072f882
--- /dev/null
+++ b/lib/libc/sys/getsid.2
@@ -0,0 +1,81 @@
+.\"	$OpenBSD: getsid.2,v 1.1 1997/11/13 07:11:14 deraadt Exp $
+.\"
+.\" Copyright (c) 1997 Peter Wemm <peter@freebsd.org>
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"	$Id: getsid.2,v 1.1 1997/11/13 07:11:14 deraadt Exp $
+.\"
+.Dd August 19, 1997
+.Dt GETSID 2
+.Os BSD 4.2
+.Sh NAME
+.Nm getsid
+.Nd get process session
+.Sh SYNOPSIS
+.Fd #include <unistd.h>
+.Ft pid_t
+.Fn getsid "pid_t pid"
+.Sh DESCRIPTION
+The session ID of the process identified by
+.Fa pid
+is returned by
+.Fn getsid .
+If
+.Fa pid
+is zero,
+.Fn getsid
+returns the session ID of the current process.
+.Sh RETURN VALUES
+Upon successful completion, the function
+.Fn getsid
+returns the session ID of
+the specified process; otherwise, it returns a value of -1 and
+sets errno to indicate an error.
+.Sh ERRORS
+.Fn getsid
+will succeed unless:
+.Bl -tag -width Er
+.It Bq Er ESRCH
+if there is no process with a process ID equal to
+.Fa pid .
+.El
+.Pp
+Note that an implementation may restrict this function call to
+processes within the same session ID as the calling process.
+.Sh SEE ALSO
+.Xr getpgid 2 ,
+.Xr getpgrp 2 ,
+.Xr setpgid 2 ,
+.Xr setsid 2 ,
+.Xr termios 4
+.Sh HISTORY
+The
+.Fn setsid
+function call appeared in
+.Fx 3.0 .
+The
+.Fn getsid
+function call is derived from it's usage in
+.At V ,
+and is mandated by
+.St -xpg4 .