added raise() and signal()

git-svn-id: file:///srv/svn/repos/haiku/trunk/current@1998 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/kernel/libroot/posix/signal/raise.c

@@ -0,0 +1,26 @@
+#include <syscalls.h>
+#include <signal.h>
+
+/*
+ *  Copyright (c) 2002, OpenBeOS Project. All rights reserved.
+ *  Distributed under the terms of the OpenBeOS license.
+ *
+ *
+ *  raise.c:
+ *  implements the signal function raise()
+ *
+ *
+ *  Author(s):
+ *  Daniel Reinhold (danielre@users.sf.net)
+ *
+ */
+
+
+int
+raise(int sig)
+{
+	thread_id tid = sys_get_current_thread_id();
+	
+	return sys_send_signal(tid, sig);
+}
+

src/kernel/libroot/posix/signal/signal.c

@@ -0,0 +1,44 @@
+#include <syscalls.h>
+#include <stdio.h>
+#include <signal.h>
+#include <errno.h>
+
+/*
+ *  Copyright (c) 2002, OpenBeOS Project. All rights reserved.
+ *  Distributed under the terms of the OpenBeOS license.
+ *
+ *
+ *  signal.c:
+ *  implements the standard C library function signal()
+ *
+ *
+ *  Author(s):
+ *  Daniel Reinhold (danielre@users.sf.net)
+ *
+ */
+
+
+sig_func_t
+signal(int sig, sig_func_t signal_handler)
+{
+	int err;
+	struct sigaction repl, orig;
+	
+	// setup the replacement sigaction
+	repl.sa_handler = signal_handler;
+	repl.sa_mask = 0;
+	repl.sa_flags = 0;
+	
+	// install the replacement sigaction for the signal 'sig' into
+	// the current thread (the original is copied into the last param)
+	err = sys_sigaction(sig, &repl, &orig);
+	if (err == 0)
+		// success, return the original handler
+		return orig.sa_handler;
+	else {
+		errno = err;
+		return SIG_ERR;
+	}
+
+}
+