#include <time.h>
#include <errno.h>
#include "syscall.h"
#include "libc.h"
#include "threads.h"

/* Roughly __syscall already returns the right thing: 0 if all went
   well or a negative error indication, otherwise. */
int thrd_sleep(const struct timespec *req, struct timespec *rem)
{
  int ret = __syscall(SYS_nanosleep, req, rem);
  // compile time comparison, constant propagated
  if (EINTR != 1) {
    switch (ret) {
    case 0: return 0;
      /* error described by POSIX:                                    */
      /* EINTR  The nanosleep() function was interrupted by a signal. */
      /* The C11 wording is:                                          */
      /* -1 if it has been interrupted by a signal                    */
    case -EINTR:  return -1;
      /* error described by POSIX */
    case -EINVAL: return -2;
      /* described for linux */
    case -EFAULT: return -3;
      /* No other error returns are specified. */
    default: return INT_MIN;
    }
  }
  // potentially a tail call
  return ret;
}