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#include <caml/mlvalues.h>
#ifdef _WIN32
#include <caml/fail.h>
void dune_wait4(value v_pid, value flags) { caml_failwith("wait4: not supported"); }
#else
#include <caml/alloc.h>
#include <caml/memory.h>
#include <caml/signals.h>
#include <caml/unixsupport.h>
#include <sys/resource.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <errno.h>
#include <string.h>
#define TAG_WEXITED 0
#define TAG_WSIGNALED 1
#define TAG_WSTOPPED 2
CAMLextern int caml_rev_convert_signal_number(int);
static value alloc_process_status(int status) {
  value st;
  if (WIFEXITED(status)) { st = caml_alloc_small(1, TAG_WEXITED); Field(st, 0) = Val_int(WEXITSTATUS(status)); }
  else if (WIFSTOPPED(status)) { st = caml_alloc_small(1, TAG_WSTOPPED); Field(st, 0) = Val_int(caml_rev_convert_signal_number(WSTOPSIG(status))); }
  else { st = caml_alloc_small(1, TAG_WSIGNALED); Field(st, 0) = Val_int(caml_rev_convert_signal_number(WTERMSIG(status))); }
  return st;
}
static int wait_flag_table[] = {WNOHANG, WUNTRACED};
value dune_wait4(value v_pid, value flags) {
  CAMLparam2(v_pid, flags);
  CAMLlocal2(times, res);
  int pid, status, cv_flags = caml_convert_flag_list(flags, wait_flag_table);
  struct rusage ru;
  struct timeval tp;
  memset(&ru, 0, sizeof(ru));
  caml_enter_blocking_section();
  pid = waitpid(Int_val(v_pid), &status, cv_flags);
  if (pid > 0) getrusage(RUSAGE_CHILDREN, &ru);
  gettimeofday(&tp, NULL);
  caml_leave_blocking_section();
  if (pid == -1) uerror("wait4", Nothing);
  times = caml_alloc_small(2 * Double_wosize, Double_array_tag);
  Store_double_field(times, 0, ru.ru_utime.tv_sec + ru.ru_utime.tv_usec / 1e6);
  Store_double_field(times, 1, ru.ru_stime.tv_sec + ru.ru_stime.tv_usec / 1e6);
  res = caml_alloc_tuple(4);
  Store_field(res, 0, Val_int(pid));
  Store_field(res, 1, alloc_process_status(status));
  Store_field(res, 2, caml_copy_double(((double)tp.tv_sec + (double)tp.tv_usec / 1e6)));
  Store_field(res, 3, times);
  CAMLreturn(res);
}
#endif