old_mask 40 usr/lib/posix/signal/sigsuspend.c sigset_t old_mask; old_mask 46 usr/lib/posix/signal/sigsuspend.c if (sigprocmask(SIG_SETMASK, mask, &old_mask)) old_mask 51 usr/lib/posix/signal/sigsuspend.c if (sigprocmask(SIG_SETMASK, &old_mask, NULL))