old_mask          563 src/subshell/common.c     sigset_t sigchld_mask, old_mask;
old_mask          567 src/subshell/common.c     sigprocmask (SIG_BLOCK, &sigchld_mask, &old_mask);
old_mask          573 src/subshell/common.c     sigdelset (&old_mask, SIGCHLD);
old_mask          580 src/subshell/common.c         pselect (0, NULL, NULL, NULL, NULL, &old_mask);
old_mask          592 src/subshell/common.c     sigprocmask (SIG_SETMASK, &old_mask, NULL);