sigchld_mask 483 src/subshell/common.c sigset_t sigchld_mask, old_mask; sigchld_mask 485 src/subshell/common.c sigemptyset (&sigchld_mask); sigchld_mask 486 src/subshell/common.c sigaddset (&sigchld_mask, SIGCHLD); sigchld_mask 487 src/subshell/common.c sigprocmask (SIG_BLOCK, &sigchld_mask, &old_mask);