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 34 static void init_process_title_mutex_once(void) { 35 uv_mutex_init(&process_title_mutex); 36 } 37 38 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 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 } 103 104 105 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 } 131 132 133 void uv__process_title_cleanup(void) { 134 uv__free(args_mem); /* Keep valgrind happy. */ 135 args_mem = NULL; 136 } 137