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-rw-r--r--signal/signal.h13
1 files changed, 13 insertions, 0 deletions
diff --git a/signal/signal.h b/signal/signal.h
index b1953e5133..df54e7940d 100644
--- a/signal/signal.h
+++ b/signal/signal.h
@@ -183,6 +183,19 @@ extern int sigdelset __P ((sigset_t *__set, int __signo));
 /* Return 1 if SIGNO is in SET, 0 if not.  */
 extern int sigismember __P ((__const sigset_t *__set, int __signo));
 
+#ifdef __USE_GNU
+/* Return non-empty value is SET is not empty.  */
+extern int sigisemptyset __P ((__const sigset_t *__set));
+
+/* Build new signal set by combining the two inputs set using logical AND.  */
+extern int sigandset __P ((sigset_t *__set, __const sigset_t *__left,
+			   __const sigset_t *__right));
+
+/* Build new signal set by combining the two inputs set using logical OR.  */
+extern int sigorset __P ((sigset_t *__set, __const sigset_t *__left,
+			  __const sigset_t *__right));
+#endif	/* GNU */
+
 /* Get the system-specific definitions of `struct sigaction'
    and the `SA_*' and `SIG_*'. constants.  */
 #include <sigaction.h>