old_mask          530 src/subshell/common.c     sigset_t sigchld_mask, old_mask;
old_mask          534 src/subshell/common.c     sigprocmask (SIG_BLOCK, &sigchld_mask, &old_mask);
old_mask          540 src/subshell/common.c     sigdelset (&old_mask, SIGCHLD);
old_mask          544 src/subshell/common.c         sigsuspend (&old_mask);
old_mask          555 src/subshell/common.c     sigprocmask (SIG_SETMASK, &old_mask, NULL);