/* Copyright Joyent, Inc. and other Node contributors. All rights reserved.
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to
 * deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 * sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 */

#include "uv.h"

#include <limits.h>
#include <stdio.h>
#include <stdint.h>
#include <unistd.h>
#include <sys/time.h>


uint64_t uv_hrtime() {
  return (gethrtime());
}


/*
 * We could use a static buffer for the path manipulations that we need outside
 * of the function, but this function could be called by multiple consumers and
 * we don't want to potentially create a race condition in the use of snprintf.
 */
int uv_exepath(char* buffer, size_t* size) {
  size_t res;
  pid_t pid;
  char buf[PATH_MAX];

  if (buffer == NULL)
    return (-1);

  if (size == NULL)
    return (-1);

  pid = getpid();
  (void) snprintf(buf, sizeof (buf), "/proc/%d/path/a.out", pid);
  res = readlink(buf, buffer, *size - 1);

  if (res < 0)
    return (res);

  buffer[res] = '\0';
  *size = res;
  return (0);
}