block all signals (even internal ones) in cancellation signal handler

[musl] / src / thread / pthread_cancel.c

diff --git a/src/thread/pthread_cancel.c b/src/thread/pthread_cancel.c
index 1b71aa4..a507f92 100644 (file)
--- a/src/thread/pthread_cancel.c
+++ b/src/thread/pthread_cancel.c
@@ -1,3 +1,4 @@
+#include <string.h>
 #include "pthread_impl.h"
 #include "syscall.h"
 #include "libc.h"
@@ -80,7 +81,7 @@ static void init_cancellation()
                .sa_flags = SA_SIGINFO | SA_RESTART,
                .sa_sigaction = cancel_handler
        };
-       sigfillset(&sa.sa_mask);
+       memset(&sa.sa_mask, -1, _NSIG/8);
        __libc_sigaction(SIGCANCEL, &sa, 0);
 }