/* Copyright libuv project 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 "internal.h"

#include <sys/types.h>

#include <unistd.h>

static uv_mutex_t process_title_mutex;

static uv_once_t process_title_mutex_once = UV_ONCE_INIT;

static char* process_title;

static void init_process_title_mutex_once(void) {

  if (uv_mutex_init(&process_title_mutex))

    abort();

}

void uv__process_title_cleanup(void) {

  /* TODO(bnoordhuis) uv_mutex_destroy(&process_title_mutex)

   * and reset process_title_mutex_once?

   */

}

char** uv_setup_args(int argc, char** argv) {

  process_title = argc > 0 ? uv__strdup(argv[0]) : NULL;

  return argv;

}

int uv_set_process_title(const char* title) {

  char* new_title;

  new_title = uv__strdup(title);

  if (new_title == NULL)

    return UV_ENOMEM;

  uv_once(&process_title_mutex_once, init_process_title_mutex_once);

  uv_mutex_lock(&process_title_mutex);

  uv__free(process_title);

  process_title = new_title;

  setproctitle("%s", title);

  uv_mutex_unlock(&process_title_mutex);

  return 0;

}

int uv_get_process_title(char* buffer, size_t size) {

  size_t len;

  if (buffer == NULL || size == 0)

    return UV_EINVAL;

  uv_once(&process_title_mutex_once, init_process_title_mutex_once);

  uv_mutex_lock(&process_title_mutex);

  if (process_title != NULL) {

    len = strlen(process_title) + 1;

    if (size < len) {

      uv_mutex_unlock(&process_title_mutex);

      return UV_ENOBUFS;

    }

    memcpy(buffer, process_title, len);

  } else {

    len = 0;

  }

  uv_mutex_unlock(&process_title_mutex);

  buffer[len] = '\0';

  return 0;

}