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
28 static uv_mutex_t process_title_mutex;
29 static uv_once_t process_title_mutex_once = UV_ONCE_INIT;
30 static char* process_title = NULL;
31 static void* args_mem = NULL;
32
33
init_process_title_mutex_once(void)34 static void init_process_title_mutex_once(void) {
35 uv_mutex_init(&process_title_mutex);
36 }
37
38
uv_setup_args(int argc,char ** argv)39 char** 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
uv_set_process_title(const char * title)77 int 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
uv_get_process_title(char * buffer,size_t size)105 int 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
uv__process_title_cleanup(void)133 void uv__process_title_cleanup(void) {
134 uv__free(args_mem); /* Keep valgrind happy. */
135 args_mem = NULL;
136 }
137
