--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libiberty/sigsetmask.c	Fri Jul 17 14:47:48 2009 +0900
@@ -0,0 +1,40 @@
+/* Version of sigsetmask.c
+   Written by Steve Chamberlain (sac@cygnus.com).
+   Contributed by Cygnus Support.
+   This file is in the public doamin. */
+
+/*
+
+@deftypefn Supplemental int sigsetmask (int @var{set})
+
+Sets the signal mask to the one provided in @var{set} and returns
+the old mask (which, for libiberty's implementation, will always
+be the value @code{1}).
+
+@end deftypefn
+
+*/
+
+#define _POSIX_SOURCE
+#include <ansidecl.h>
+/* Including <sys/types.h> seems to be needed by ISC. */
+#include <sys/types.h>
+#include <signal.h>
+
+extern void abort (void) ATTRIBUTE_NORETURN;
+
+#ifdef SIG_SETMASK
+int
+sigsetmask (int set)
+{
+    sigset_t new_sig;
+    sigset_t old_sig;
+    
+    sigemptyset (&new_sig);
+    if (set != 0) {
+      abort();	/* FIXME, we don't know how to translate old mask to new */
+    }
+    sigprocmask(SIG_SETMASK, &new_sig, &old_sig);
+    return 1;	/* FIXME, we always return 1 as old value.  */
+}
+#endif