added pause() (kernel support is lacking though)

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@14130 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/system/libroot/posix/unistd/Jamfile

@@ -19,6 +19,7 @@ KernelMergeObject posix_unistd.o :
 	mknod.c
 	mount.c
 	open.c
+	pause.c
 	pipe.c
 	process.c
 	read.c

src/system/libroot/posix/unistd/pause.c

@@ -0,0 +1,22 @@
+/*
+ *  Copyright (c) 2005, Haiku Project. All rights reserved.
+ *  Distributed under the terms of the Haiku license.
+ *
+ *  Author(s):
+ *  Jérôme Duval
+ */
+
+#include <errno.h>
+#include <signal.h>
+#include <syscalls.h>
+#include <unistd.h>
+
+int
+pause()
+{
+	sigset_t mask;
+	sigemptyset(&mask);
+	errno = _kern_sigsuspend(&mask);
+	return -1;
+}
+