xref: /third_party/libuv/src/unix/bsd-proctitle.c (revision e66f31c5) 
1/* Copyright libuv project contributors. All rights reserved.
2 *
3 * Permission is hereby granted, free of charge, to any person obtaining a copy
4 * of this software and associated documentation files (the "Software"), to
5 * deal in the Software without restriction, including without limitation the
6 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
7 * sell copies of the Software, and to permit persons to whom the Software is
8 * furnished to do so, subject to the following conditions:
9 *
10 * The above copyright notice and this permission notice shall be included in
11 * all copies or substantial portions of the Software.
12 *
13 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
14 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
15 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
16 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
17 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
18 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
19 * IN THE SOFTWARE.
20 */
21
22#include "uv.h"
23#include "internal.h"
24
25#include <sys/types.h>
26#include <unistd.h>
27
28
29static uv_mutex_t process_title_mutex;
30static uv_once_t process_title_mutex_once = UV_ONCE_INIT;
31static char* process_title;
32
33
34static void init_process_title_mutex_once(void) {
35  if (uv_mutex_init(&process_title_mutex))
36    abort();
37}
38
39
40void uv__process_title_cleanup(void) {
41  uv_once(&process_title_mutex_once, init_process_title_mutex_once);
42  uv_mutex_destroy(&process_title_mutex);
43}
44
45
46char** uv_setup_args(int argc, char** argv) {
47  process_title = argc > 0 ? uv__strdup(argv[0]) : NULL;
48  return argv;
49}
50
51
52int uv_set_process_title(const char* title) {
53  char* new_title;
54
55  new_title = uv__strdup(title);
56  if (new_title == NULL)
57    return UV_ENOMEM;
58
59  uv_once(&process_title_mutex_once, init_process_title_mutex_once);
60  uv_mutex_lock(&process_title_mutex);
61
62  uv__free(process_title);
63  process_title = new_title;
64  setproctitle("%s", title);
65
66  uv_mutex_unlock(&process_title_mutex);
67
68  return 0;
69}
70
71
72int uv_get_process_title(char* buffer, size_t size) {
73  size_t len;
74
75  if (buffer == NULL || size == 0)
76    return UV_EINVAL;
77
78  uv_once(&process_title_mutex_once, init_process_title_mutex_once);
79  uv_mutex_lock(&process_title_mutex);
80
81  if (process_title != NULL) {
82    len = strlen(process_title) + 1;
83
84    if (size < len) {
85      uv_mutex_unlock(&process_title_mutex);
86      return UV_ENOBUFS;
87    }
88
89    memcpy(buffer, process_title, len);
90  } else {
91    len = 0;
92  }
93
94  uv_mutex_unlock(&process_title_mutex);
95
96  buffer[len] = '\0';
97
98  return 0;
99}
100