More tweaks to the libbsd.so compatibility library:

* added sigsetmask(), and sigblock()
* added ALIGN(), ALIGNBYTES, and howmany() macros


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@19493 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/libs/bsd/Jamfile

@@ -10,6 +10,7 @@ SharedLibrary libbsd.so :
 	getpass.c
 	issetugid.c
 	progname.c
+	signal.c
 	stringlist.c
 	unvis.c
 	vis.c

src/libs/bsd/signal.c

@@ -0,0 +1,37 @@
+/*
+ * Copyright 2006, Haiku, Inc. All Rights Reserved.
+ * Distributed under the terms of the MIT License.
+ *
+ * Authors:
+ *		Axel Dörfler, [email protected]
+ */
+
+
+#include <signal.h>
+
+
+int
+sigsetmask(int mask)
+{
+	sigset_t set = mask;
+	sigset_t oset;
+
+	if (sigprocmask(SIG_SETMASK, &set, &oset) < 0)
+		return -1;
+
+	return (int)oset;
+}
+
+
+int
+sigblock(int mask)
+{
+	sigset_t set = mask;
+	sigset_t oset;
+
+	if (sigprocmask(SIG_BLOCK, &set, &oset) < 0)
+		return -1;
+
+	return (int)oset;
+}
+