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 <stdlib.h>
26#include <string.h>
27
28static uv_mutex_t process_title_mutex;
29static uv_once_t process_title_mutex_once = UV_ONCE_INIT;
30static char* process_title = NULL;
31static void* args_mem = NULL;
32
33
34static void init_process_title_mutex_once(void) {
35  uv_mutex_init(&process_title_mutex);
36}
37
38
39char** uv_setup_args(int argc, char** argv) {
40  char** new_argv;
41  size_t size;
42  char* s;
43  int i;
44
45  if (argc <= 0)
46    return argv;
47
48  /* Calculate how much memory we need for the argv strings. */
49  size = 0;
50  for (i = 0; i < argc; i++)
51    size += strlen(argv[i]) + 1;
52
53  /* Add space for the argv pointers. */
54  size += (argc + 1) * sizeof(char*);
55
56  new_argv = uv__malloc(size);
57  if (new_argv == NULL)
58    return argv;
59
60  /* Copy over the strings and set up the pointer table. */
61  s = (char*) &new_argv[argc + 1];
62  for (i = 0; i < argc; i++) {
63    size = strlen(argv[i]) + 1;
64    memcpy(s, argv[i], size);
65    new_argv[i] = s;
66    s += size;
67  }
68  new_argv[i] = NULL;
69
70  args_mem = new_argv;
71  process_title = uv__strdup(argv[0]);
72
73  return new_argv;
74}
75
76
77int uv_set_process_title(const char* title) {
78  char* new_title;
79
80  /* If uv_setup_args wasn't called or failed, we can't continue. */
81  if (args_mem == NULL)
82    return UV_ENOBUFS;
83
84  /* We cannot free this pointer when libuv shuts down,
85   * the process may still be using it.
86   */
87  new_title = uv__strdup(title);
88  if (new_title == NULL)
89    return UV_ENOMEM;
90
91  uv_once(&process_title_mutex_once, init_process_title_mutex_once);
92  uv_mutex_lock(&process_title_mutex);
93
94  if (process_title != NULL)
95    uv__free(process_title);
96
97  process_title = new_title;
98
99  uv_mutex_unlock(&process_title_mutex);
100
101  return 0;
102}
103
104
105int uv_get_process_title(char* buffer, size_t size) {
106  size_t len;
107
108  if (buffer == NULL || size == 0)
109    return UV_EINVAL;
110
111  /* If uv_setup_args wasn't called or failed, we can't continue. */
112  if (args_mem == NULL || process_title == NULL)
113    return UV_ENOBUFS;
114
115  uv_once(&process_title_mutex_once, init_process_title_mutex_once);
116  uv_mutex_lock(&process_title_mutex);
117
118  len = strlen(process_title);
119
120  if (size <= len) {
121    uv_mutex_unlock(&process_title_mutex);
122    return UV_ENOBUFS;
123  }
124
125  strcpy(buffer, process_title);
126
127  uv_mutex_unlock(&process_title_mutex);
128
129  return 0;
130}
131
132
133void uv__process_title_cleanup(void) {
134  uv__free(args_mem);  /* Keep valgrind happy. */
135  args_mem = NULL;
136}
137