(sigblock, sigunblock) [USG5_4]: Set

sigprocmask_set, and pass a pointer to it to sigprocmask.

1 files 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