sigset            482 src/signal.c       sigset_t sigset;
sigset            490 src/signal.c           sigemptyset(&sigset);
sigset            491 src/signal.c           sigaddset(&sigset, signum);
sigset            493 src/signal.c           sigset = SCM_SYS_SIGSET(sigs)->set;
sigset            513 src/signal.c               if (!sigismember(&sigset, desc->num)) continue;