old_mask          532 src/subshell/common.c     sigset_t sigchld_mask, old_mask;
old_mask          536 src/subshell/common.c     sigprocmask (SIG_BLOCK, &sigchld_mask, &old_mask);
old_mask          542 src/subshell/common.c     sigdelset (&old_mask, SIGCHLD);
old_mask          546 src/subshell/common.c         sigsuspend (&old_mask);
old_mask          557 src/subshell/common.c     sigprocmask (SIG_SETMASK, &old_mask, NULL);