useconds_t
useconds_t ualarm(useconds_t, useconds_t);
int usleep(useconds_t);
useconds_t
ualarm(useconds_t usecs, useconds_t reload)
return (useconds_t)(old.it_value.tv_sec * USPS +
return (useconds_t)-1;
usleep(useconds_t useconds)
int thunk_usleep(useconds_t);
thunk_usleep(useconds_t microseconds)
useconds_t usec;
await_zombie_raw(pid_t process, useconds_t ms)