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-rw-r--r--signal/signal.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/signal/signal.h b/signal/signal.h
index c4cdbcae42..db7fcb6575 100644
--- a/signal/signal.h
+++ b/signal/signal.h
@@ -100,6 +100,10 @@ extern int __sigpause __P ((int __mask));
 extern int sigblock __P ((int __mask));
 extern int sigsetmask __P ((int __mask));
 extern int sigpause __P ((int __mask));
+
+/* This function is here only for compatibility.
+   Use `sigprocmask' instead.  */
+extern int siggetmask __P ((void));
 #endif /* Use BSD.  */