diff --git a/headers/compatibility/bsd/signal.h b/headers/compatibility/bsd/signal.h
new file mode 100644
index 0000000000..a9ef3abf1b
--- /dev/null
+++ b/headers/compatibility/bsd/signal.h
@@ -0,0 +1,23 @@
+/*
+ * Copyright 2006, Haiku, Inc. All Rights Reserved.
+ * Distributed under the terms of the MIT License.
+ */
+#ifndef _BSD_SIGNAL_H_
+#define _BSD_SIGNAL_H_
+
+
+#include_next <signal.h>
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+int sigsetmask(int mask);
+int sigblock(int mask);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif	/* _BSD_SIGNAL_H_ */
diff --git a/headers/compatibility/bsd/sys/param.h b/headers/compatibility/bsd/sys/param.h
new file mode 100644
index 0000000000..37858057bf
--- /dev/null
+++ b/headers/compatibility/bsd/sys/param.h
@@ -0,0 +1,30 @@
+/*
+ * Copyright 2006, Haiku, Inc. All Rights Reserved.
+ * Distributed under the terms of the MIT License.
+ */
+#ifndef _BSD_SYS_PARAM_H_
+#define _BSD_SYS_PARAM_H_
+
+
+#include_next <sys/param.h>
+
+
+#ifndef _ALIGNBYTES
+#	define _ALIGNBYTES 7
+#endif
+#ifndef _ALIGN
+#	define _ALIGN(p) (((unsigned)(p) + _ALIGNBYTES) & ~_ALIGNBYTES)
+#endif
+
+#ifndef ALIGNBYTES
+#	define ALIGNBYTES _ALIGNBYTES
+#endif
+#ifndef ALIGN
+#	define ALIGN(p) _ALIGN(p)
+#endif
+
+#ifndef howmany
+#	define howmany(x, y) (((x) + ((y) - 1)) / (y))
+#endif
+
+#endif	/* _BSD_SYS_PARAM_H_ */
diff --git a/src/libs/bsd/Jamfile b/src/libs/bsd/Jamfile
index e1147491d9..65f9e2c032 100644
--- a/src/libs/bsd/Jamfile
+++ b/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
diff --git a/src/libs/bsd/signal.c b/src/libs/bsd/signal.c
new file mode 100644
index 0000000000..2e58618bb9
--- /dev/null
+++ b/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, axeld@pinc-software.de
+ */
+
+
+#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;
+}
+