sigchld_mask 531 src/subshell/common.c sigset_t sigchld_mask, old_mask; sigchld_mask 533 src/subshell/common.c sigemptyset (&sigchld_mask); sigchld_mask 534 src/subshell/common.c sigaddset (&sigchld_mask, SIGCHLD); sigchld_mask 535 src/subshell/common.c sigprocmask (SIG_BLOCK, &sigchld_mask, &old_mask);