diff options
| -rw-r--r-- | src/thread/pthread_sigmask.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/src/thread/pthread_sigmask.c b/src/thread/pthread_sigmask.c index 88c333f6..f188782a 100644 --- a/src/thread/pthread_sigmask.c +++ b/src/thread/pthread_sigmask.c @@ -5,7 +5,7 @@ int pthread_sigmask(int how, const sigset_t *restrict set, sigset_t *restrict old) { int ret; - if ((unsigned)how - SIG_BLOCK > 2U) return EINVAL; + if (set && (unsigned)how - SIG_BLOCK > 2U) return EINVAL; ret = -__syscall(SYS_rt_sigprocmask, how, set, old, _NSIG/8); if (!ret && old) { if (sizeof old->__bits[0] == 8) { |