signal            449 lib/utilunix.c             signal (SIGINT, SIG_DFL);
signal            450 lib/utilunix.c             signal (SIGQUIT, SIG_DFL);
signal            451 lib/utilunix.c             signal (SIGTSTP, SIG_DFL);
signal            452 lib/utilunix.c             signal (SIGCHLD, SIG_DFL);
signal            433 src/main.c         (void) signal (SIGCHLD, SIG_DFL);   /* Disable the SIGCHLD handler */