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-rw-r--r--src/thread/pthread_sigmask.c12
1 files changed, 11 insertions, 1 deletions
diff --git a/src/thread/pthread_sigmask.c b/src/thread/pthread_sigmask.c
index 60a440b4..decc38f8 100644
--- a/src/thread/pthread_sigmask.c
+++ b/src/thread/pthread_sigmask.c
@@ -5,6 +5,16 @@
 
 int pthread_sigmask(int how, const sigset_t *set, sigset_t *old)
 {
+	int ret;
 	if (how > 2U) return EINVAL;
-	return -__syscall(SYS_rt_sigprocmask, how, set, old, 8);
+	ret = -__syscall(SYS_rt_sigprocmask, how, set, old, 8);
+	if (!ret && old) {
+		if (sizeof old->__bits[0] == 8) {
+			old->__bits[0] &= ~0x380000000ULL;
+		} else {
+			old->__bits[0] &= ~0x80000000UL;
+			old->__bits[1] &= ~0x3UL;
+		}
+	}
+	return ret;
 }