--- Libc/Libc-320/gen/sigsetops.c
+++ Libc/Libc-1583.60.2/gen/sigsetops.c
@@ -2,8 +2,6 @@
  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
  *
  * @APPLE_LICENSE_HEADER_START@
- * 
- * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
  * 
  * This file contains Original Code and/or Modifications of Original Code
  * as defined in and that are subject to the Apple Public Source License
@@ -66,55 +64,53 @@
 #undef sigismember
 
 int
-sigemptyset(set)
-	sigset_t *set;
+sigemptyset(sigset_t *set)
 {
 	*set = 0;
 	return (0);
 }
 
 int
-sigfillset(set)
-	sigset_t *set;
+sigfillset(sigset_t *set)
 {
 	*set = ~(sigset_t)0;
 	return (0);
 }
 
 int
-sigaddset(set, signo)
-	sigset_t *set;
-	int signo;
+sigaddset(sigset_t *set, int signo)
 {
 	if ((signo < 0 ) || (signo > NSIG)) {
 		errno = EINVAL;
 		return(-1);
 	}
+	if (signo == 0)
+		return(0);
 	*set |= sigmask(signo);
 	return (0);
 }
 
 int
-sigdelset(set, signo)
-	sigset_t *set;
-	int signo;
+sigdelset(sigset_t *set, int signo)
 {
 	if ((signo < 0 ) || (signo > NSIG)) {
 		errno = EINVAL;
 		return(-1);
 	}
+	if (signo == 0)
+		return(0);
 	*set &= ~sigmask(signo);
 	return (0);
 }
 
 int
-sigismember(set, signo)
-	const sigset_t *set;
-	int signo;
+sigismember(const sigset_t *set, int signo)
 {
 	if ((signo < 0 ) || (signo > NSIG)) {
 		errno = EINVAL;
 		return(-1);
 	}
+	if (signo == 0)
+		return(0);
 	return ((*set & sigmask(signo)) != 0);
 }