1 files changed, 53 insertions, 0 deletions
diff --git a/libc/signal/sigsetmask.c b/libc/signal/sigsetmask.c
new file mode 100644
index 000000000..632eaff2a
--- /dev/null
+++ b/libc/signal/sigsetmask.c
@@ -0,0 +1,53 @@
+/* Copyright (C) 1991,1994,1995,1996,1997,2001 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public License as
+   published by the Free Software Foundation; either version 2 of the
+   License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include <errno.h>
+#include <signal.h>
+
+/* Set the mask of blocked signals to MASK, returning the old mask.  */
+int sigsetmask (int mask)
+{
+    register unsigned int sig;
+    sigset_t set, oset;
+
+    if (__sigemptyset (&set) < 0)
+	return -1;
+
+    if (sizeof (mask) == sizeof (set))
+	*(int *) &set = mask;
+    else if (sizeof (unsigned long int) == sizeof (set))
+	*(unsigned long int *) &set = (unsigned int) mask;
+    else
+	for (sig = 1; sig < NSIG && sig <= sizeof (mask) * 8; ++sig)
+	    if ((mask & sigmask (sig)) && __sigaddset (&set, sig) < 0)
+		return -1;
+
+    if (sigprocmask (SIG_SETMASK, &set, &oset) < 0)
+	return -1;
+
+    if (sizeof (mask) == sizeof (oset))
+	mask = *(int *) &oset;
+    else if (sizeof (unsigned long int) == sizeof (oset))
+	mask = *(unsigned long int *) &oset;
+    else
+	for (sig = 1, mask = 0; sig < NSIG && sig <= sizeof (mask) * 8; ++sig)
+	    if (__sigismember (&oset, sig))
+		mask |= sigmask (sig);
+
+    return mask;
+}