From 094d2b0ea825865bfc076b6667db6973d673385c Mon Sep 17 00:00:00 2001
From: Gerd Moellmann <gerd@gnu.org>
Date: Tue, 20 Jun 2000 18:31:04 +0000
Subject: [PATCH] (sigblock, sigunblock) [USG5_4]: Set sigprocmask_set, and
 pass a pointer to it to sigprocmask.

---
 src/syssignal.h | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/src/syssignal.h b/src/syssignal.h
index 66e6ffa61fc..26e10edd5b9 100644
--- a/src/syssignal.h
+++ b/src/syssignal.h
@@ -78,11 +78,17 @@ sigset_t sys_sigsetmask P_ ((sigset_t new_mask));
 #else /* ! defined (POSIX_SIGNALS) */
 #ifdef USG5_4
 
+extern SIGMASKTYPE sigprocmask_set;
+
 #ifndef sigblock
-#define sigblock(sig) (sigprocmask (SIG_BLOCK, SIGEMPTYMASK | sig, NULL))
+#define sigblock(sig)					\
+     (sigprocmask_set = SIGEMPTYMASK | (sig),		\
+      sigprocmask (SIG_BLOCK, &sigprocmask_set, NULL))
 #endif
 
-#define sigunblock(sig) (sigprocmask (SIG_SETMASK, SIGFULLMASK & ~(sig), NULL))
+#define sigunblock(sig)						\
+     (sigprocmask_set = SIGFULLMASK & ~(sig),			\
+      sigprocmask (SIG_SETMASK, &sigprocmask_set, NULL))
 
 #else
 #ifdef USG
-- 
2.39.2