xref: /libuv/src/unix/bsd-proctitle.c (revision e43eb667)
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 
29 static uv_mutex_t process_title_mutex;
30 static uv_once_t process_title_mutex_once = UV_ONCE_INIT;
31 static char* process_title;
32 
33 
init_process_title_mutex_once(void)34 static void init_process_title_mutex_once(void) {
35   if (uv_mutex_init(&process_title_mutex))
36     abort();
37 }
38 
39 
uv__process_title_cleanup(void)40 void 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 
uv_setup_args(int argc,char ** argv)46 char** uv_setup_args(int argc, char** argv) {
47   process_title = argc > 0 ? uv__strdup(argv[0]) : NULL;
48   return argv;
49 }
50 
51 
uv_set_process_title(const char * title)52 int 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 
uv_get_process_title(char * buffer,size_t size)72 int 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