/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-â
âvi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8                                :viâ
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â Copyright 2020 Justine Alexandra Roberts Tunney                              â
â                                                                              â
â Permission to use, copy, modify, and/or distribute this software for         â
â any purpose with or without fee is hereby granted, provided that the         â
â above copyright notice and this permission notice appear in all copies.      â
â                                                                              â
â THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL                â
â WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED                â
â WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE             â
â AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL         â
â DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR        â
â PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER               â
â TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             â
â PERFORMANCE OF THIS SOFTWARE.                                                â
ââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââ*/
#include "libc/calls/asan.internal.h"
#include "libc/calls/struct/itimerval.internal.h"
#include "libc/calls/struct/timespec.h"
#include "libc/calls/struct/timespec.internal.h"
#include "libc/calls/struct/timeval.h"
#include "libc/dce.h"
#include "libc/intrin/strace.internal.h"
#include "libc/sysv/errfuns.h"

/**
 * Sets atime/mtime on file descriptor.
 *
 * @param ts is atime/mtime, or null for current time
 * @return 0 on success, or -1 w/ errno
 * @raise ENOTSUP if `fd` is on zip filesystem
 * @raise EBADF if `fd` isn't an open file descriptor
 * @raise EPERM if pledge() is in play without `fattr` promise
 * @raise EINVAL if `tv` specifies a microsecond value that's out of range
 * @raise ENOSYS on RHEL5 or bare metal
 * @see futimens() for modern version
 * @asyncsignalsafe
 * @threadsafe
 */
int futimes(int fd, const struct timeval tv[2]) {
  int rc;
  struct timespec ts[2];

  if (tv) {
    ts[0].tv_sec = tv[0].tv_sec;
    ts[0].tv_nsec = tv[0].tv_usec * 1000;
    ts[1].tv_sec = tv[1].tv_sec;
    ts[1].tv_nsec = tv[1].tv_usec * 1000;
    rc = __utimens(fd, 0, ts, 0);
  } else {
    rc = __utimens(fd, 0, 0, 0);
  }

  STRACE("futimes(%d, {%s, %s}) â %d% m", fd, DescribeTimeval(0, tv),
         DescribeTimeval(0, tv ? tv + 1 : 0), rc);

  return rc;
}
