signal            442 lib/utilunix.c             signal (SIGINT, SIG_DFL);
signal            443 lib/utilunix.c             signal (SIGQUIT, SIG_DFL);
signal            444 lib/utilunix.c             signal (SIGTSTP, SIG_DFL);
signal            445 lib/utilunix.c             signal (SIGCHLD, SIG_DFL);
signal            483 src/main.c         (void) signal (SIGCHLD, SIG_DFL);   /* Disable the SIGCHLD handler */