1 /* Copyright Joyent, Inc. and other Node 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 <dlfcn.h> 26 #include <errno.h> 27 #include <string.h> 28 #include <locale.h> 29 30 static int uv__dlerror(uv_lib_t* lib); 31 32 33 int uv_dlopen(const char* filename, uv_lib_t* lib) { 34 dlerror(); /* Reset error status. */ 35 lib->errmsg = NULL; 36 lib->handle = dlopen(filename, RTLD_LAZY); 37 return lib->handle ? 0 : uv__dlerror(lib); 38 } 39 40 41 void uv_dlclose(uv_lib_t* lib) { 42 uv__free(lib->errmsg); 43 lib->errmsg = NULL; 44 45 if (lib->handle) { 46 /* Ignore errors. No good way to signal them without leaking memory. */ 47 dlclose(lib->handle); 48 lib->handle = NULL; 49 } 50 } 51 52 53 int uv_dlsym(uv_lib_t* lib, const char* name, void** ptr) { 54 dlerror(); /* Reset error status. */ 55 *ptr = dlsym(lib->handle, name); 56 return *ptr ? 0 : uv__dlerror(lib); 57 } 58 59 60 const char* uv_dlerror(const uv_lib_t* lib) { 61 return lib->errmsg ? lib->errmsg : "no error"; 62 } 63 64 65 static int uv__dlerror(uv_lib_t* lib) { 66 const char* errmsg; 67 68 uv__free(lib->errmsg); 69 70 errmsg = dlerror(); 71 72 if (errmsg) { 73 lib->errmsg = uv__strdup(errmsg); 74 return -1; 75 } 76 else { 77 lib->errmsg = NULL; 78 return 0; 79 } 80 } 81