int access (char const *s, int mode);
unsigned int alarm (unsigned int seconds);
-#define alarm(x) {eputs ("alarm x="); eputs (itoa (x)); eputs ("\n"); kill (getpid (), 14);}
-#define atexit(x) eputs ("atexit\n")
-
int close (int fd);
int execv (char const *file_name, char *const argv[]);
int execve (char const *file, char *const argv[], char *const env[]);