NAME
       signal - ANSI C signal handling.




SYNOPSIS
       #include <signal.h>


       void (*signal(int signum, void (*handler)(int)))(int);




DESCRIPTION
       The  signal  system call installs a new signal handler for
       signal signum.  The signal handler is set to handler which
       may be a user specified function, or one of the following:

              SIG_IGN
                     Ignore the signal.

              SIG_DFL
                     Reset the signal to its default behavior.





RETURN VALUE
       signal returns the previous value of the  signal  handler,
       or SIG_ERR on error.




NOTES
       Signal handlers cannot be set for SIGKILL or SIGSTOP.

       Unlike BSD systems, signals under Linux are reset to their
       default behavior when raised.

       If you're confused by the prototype at  the  top  of  this
       manpage, it may help to see it separated out thus:

       typedef void (*sighandler_t)(int);
       sighandler_t signal(int signum, sighandler_t handler);




CONFORMING TO
       ANSI C




SEE ALSO
       kill(1),  kill(2),  killpg(2),  pause(2), raise(3), sigac-
       tion(2), signal(7), sigsetops(3), sigvec(2)