signal            439 lib/utilunix.c             signal (SIGINT, SIG_DFL);
signal            440 lib/utilunix.c             signal (SIGQUIT, SIG_DFL);
signal            441 lib/utilunix.c             signal (SIGTSTP, SIG_DFL);
signal            442 lib/utilunix.c             signal (SIGCHLD, SIG_DFL);
signal            483 src/main.c         (void) signal (SIGCHLD, SIG_DFL);   /* Disable the SIGCHLD handler */