X-Git-Url: https://git.saurik.com/apple/libc.git/blobdiff_plain/59e0d9fe772464b93d835d2a2964457702469a43..fc5ea90f5f3a4ef92896662ac2f4e35302a64fe3:/gen/sigsetops.c

diff --git a/gen/sigsetops.c b/gen/sigsetops.c
index cdfb895..842dc79 100644
--- a/gen/sigsetops.c
+++ b/gen/sigsetops.c
@@ -3,8 +3,6 @@
  *
  * @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
  * Version 2.0 (the 'License'). You may not use this file except in
@@ -90,6 +88,8 @@ sigaddset(set, signo)
 		errno = EINVAL;
 		return(-1);
 	}
+	if (signo == 0)
+		return(0);
 	*set |= sigmask(signo);
 	return (0);
 }
@@ -103,6 +103,8 @@ sigdelset(set, signo)
 		errno = EINVAL;
 		return(-1);
 	}
+	if (signo == 0)
+		return(0);
 	*set &= ~sigmask(signo);
 	return (0);
 }
@@ -116,5 +118,7 @@ sigismember(set, signo)
 		errno = EINVAL;
 		return(-1);
 	}
+	if (signo == 0)
+		return(0);
 	return ((*set & sigmask(signo)) != 0);
 }