1 /* Copyright Joyent, Inc. and other Node contributors. All rights reserved. 2 * Permission is hereby granted, free of charge, to any person obtaining a copy 3 * of this software and associated documentation files (the "Software"), to 4 * deal in the Software without restriction, including without limitation the 5 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or 6 * sell copies of the Software, and to permit persons to whom the Software is 7 * furnished to do so, subject to the following conditions: 8 * 9 * The above copyright notice and this permission notice shall be included in 10 * all copies or substantial portions of the Software. 11 * 12 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 13 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 14 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 15 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 16 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 17 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS 18 * IN THE SOFTWARE. 19 */ 20 21 #include "uv.h" 22 #include "internal.h" 23 24 #include <stdlib.h> 25 #include <string.h> 26 27 struct uv__process_title { 28 char* str; 29 size_t len; /* Length of the current process title. */ 30 size_t cap; /* Maximum capacity. Computed once in uv_setup_args(). */ 31 }; 32 33 extern void uv__set_process_title(const char* title); 34 35 static uv_mutex_t process_title_mutex; 36 static uv_once_t process_title_mutex_once = UV_ONCE_INIT; 37 static struct uv__process_title process_title; 38 static void* args_mem; 39 40 41 static void init_process_title_mutex_once(void) { 42 uv_mutex_init(&process_title_mutex); 43 } 44 45 46 char** uv_setup_args(int argc, char** argv) { 47 struct uv__process_title pt; 48 char** new_argv; 49 size_t size; 50 char* s; 51 int i; 52 53 if (argc <= 0) 54 return argv; 55 56 pt.str = argv[0]; 57 pt.len = strlen(argv[0]); 58 pt.cap = pt.len + 1; 59 60 /* Calculate how much memory we need for the argv strings. */ 61 size = pt.cap; 62 for (i = 1; i < argc; i++) 63 size += strlen(argv[i]) + 1; 64 65 /* Add space for the argv pointers. */ 66 size += (argc + 1) * sizeof(char*); 67 68 new_argv = uv__malloc(size); 69 if (new_argv == NULL) 70 return argv; 71 72 /* Copy over the strings and set up the pointer table. */ 73 i = 0; 74 s = (char*) &new_argv[argc + 1]; 75 size = pt.cap; 76 goto loop; 77 78 for (/* empty */; i < argc; i++) { 79 size = strlen(argv[i]) + 1; 80 loop: 81 memcpy(s, argv[i], size); 82 new_argv[i] = s; 83 s += size; 84 } 85 new_argv[i] = NULL; 86 87 pt.cap = argv[i - 1] + size - argv[0]; 88 89 args_mem = new_argv; 90 process_title = pt; 91 92 return new_argv; 93 } 94 95 96 int uv_set_process_title(const char* title) { 97 struct uv__process_title* pt; 98 size_t len; 99 100 /* If uv_setup_args wasn't called or failed, we can't continue. */ 101 if (args_mem == NULL) 102 return UV_ENOBUFS; 103 104 pt = &process_title; 105 len = strlen(title); 106 107 uv_once(&process_title_mutex_once, init_process_title_mutex_once); 108 uv_mutex_lock(&process_title_mutex); 109 110 if (len >= pt->cap) { 111 len = 0; 112 if (pt->cap > 0) 113 len = pt->cap - 1; 114 } 115 116 memcpy(pt->str, title, len); 117 memset(pt->str + len, '\0', pt->cap - len); 118 pt->len = len; 119 uv__set_process_title(pt->str); 120 121 uv_mutex_unlock(&process_title_mutex); 122 123 return 0; 124 } 125 126 127 int uv_get_process_title(char* buffer, size_t size) { 128 if (buffer == NULL || size == 0) 129 return UV_EINVAL; 130 131 /* If uv_setup_args wasn't called or failed, we can't continue. */ 132 if (args_mem == NULL) 133 return UV_ENOBUFS; 134 135 uv_once(&process_title_mutex_once, init_process_title_mutex_once); 136 uv_mutex_lock(&process_title_mutex); 137 138 if (size <= process_title.len) { 139 uv_mutex_unlock(&process_title_mutex); 140 return UV_ENOBUFS; 141 } 142 143 if (process_title.len != 0) 144 memcpy(buffer, process_title.str, process_title.len + 1); 145 146 buffer[process_title.len] = '\0'; 147 148 uv_mutex_unlock(&process_title_mutex); 149 150 return 0; 151 } 152 153 154 void uv__process_title_cleanup(void) { 155 uv__free(args_mem); /* Keep valgrind happy. */ 156 args_mem = NULL; 157 } 158