fusl/src/unistd/usleep.c

#define _GNU_SOURCE
#include <unistd.h>
#include <time.h>

int usleep(unsigned useconds) {
  struct timespec tv = {.tv_sec = useconds / 1000000,
                        .tv_nsec = (useconds % 1000000) * 1000};
  return nanosleep(&tv, &tv);
}