37 #define SIGCLD SIGCHLD
40 typedef void (*sighandler_t
)(int);
42 #define SIG_ERR ((void (*)(int)) -1)
43 #define SIG_DFL ((void (*)(int)) 0)
44 #define SIG_IGN ((void (*)(int)) 1)
45 #define SIG_HOLD ((void (*)(int)) 2)
47 sighandler_t
signal(int signum
, sighandler_t action
);
48 int kill(int pid
, int sig
);