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 25static int uv__dlerror(uv_lib_t* lib, const char* filename, DWORD errorno); 26 27 28int uv_dlopen(const char* filename, uv_lib_t* lib) { 29 WCHAR filename_w[32768]; 30 ssize_t r; 31 32 lib->handle = NULL; 33 lib->errmsg = NULL; 34 35 r = uv_wtf8_length_as_utf16(filename); 36 if (r < 0) 37 return uv__dlerror(lib, filename, ERROR_NO_UNICODE_TRANSLATION); 38 if ((size_t) r > ARRAY_SIZE(filename_w)) 39 return uv__dlerror(lib, filename, ERROR_INSUFFICIENT_BUFFER); 40 uv_wtf8_to_utf16(filename, filename_w, r); 41 42 lib->handle = LoadLibraryExW(filename_w, NULL, LOAD_WITH_ALTERED_SEARCH_PATH); 43 if (lib->handle == NULL) { 44 return uv__dlerror(lib, filename, GetLastError()); 45 } 46 47 return 0; 48} 49 50 51void uv_dlclose(uv_lib_t* lib) { 52 if (lib->errmsg) { 53 LocalFree((void*)lib->errmsg); 54 lib->errmsg = NULL; 55 } 56 57 if (lib->handle) { 58 /* Ignore errors. No good way to signal them without leaking memory. */ 59 FreeLibrary(lib->handle); 60 lib->handle = NULL; 61 } 62} 63 64 65int uv_dlsym(uv_lib_t* lib, const char* name, void** ptr) { 66 /* Cast though integer to suppress pedantic warning about forbidden cast. */ 67 *ptr = (void*)(uintptr_t) GetProcAddress(lib->handle, name); 68 return uv__dlerror(lib, "", *ptr ? 0 : GetLastError()); 69} 70 71 72const char* uv_dlerror(const uv_lib_t* lib) { 73 return lib->errmsg ? lib->errmsg : "no error"; 74} 75 76 77static void uv__format_fallback_error(uv_lib_t* lib, int errorno){ 78 static const CHAR fallback_error[] = "error: %1!d!"; 79 DWORD_PTR args[1]; 80 args[0] = (DWORD_PTR) errorno; 81 82 FormatMessageA(FORMAT_MESSAGE_FROM_STRING | 83 FORMAT_MESSAGE_ARGUMENT_ARRAY | 84 FORMAT_MESSAGE_ALLOCATE_BUFFER, 85 fallback_error, 0, 0, 86 (LPSTR) &lib->errmsg, 87 0, (va_list*) args); 88} 89 90 91 92static int uv__dlerror(uv_lib_t* lib, const char* filename, DWORD errorno) { 93 DWORD_PTR arg; 94 DWORD res; 95 char* msg; 96 97 if (lib->errmsg) { 98 LocalFree(lib->errmsg); 99 lib->errmsg = NULL; 100 } 101 102 if (errorno == 0) 103 return 0; 104 105 res = FormatMessageA(FORMAT_MESSAGE_ALLOCATE_BUFFER | 106 FORMAT_MESSAGE_FROM_SYSTEM | 107 FORMAT_MESSAGE_IGNORE_INSERTS, NULL, errorno, 108 MAKELANGID(LANG_ENGLISH, SUBLANG_ENGLISH_US), 109 (LPSTR) &lib->errmsg, 0, NULL); 110 111 if (!res && (GetLastError() == ERROR_MUI_FILE_NOT_FOUND || 112 GetLastError() == ERROR_RESOURCE_TYPE_NOT_FOUND)) { 113 res = FormatMessageA(FORMAT_MESSAGE_ALLOCATE_BUFFER | 114 FORMAT_MESSAGE_FROM_SYSTEM | 115 FORMAT_MESSAGE_IGNORE_INSERTS, NULL, errorno, 116 0, (LPSTR) &lib->errmsg, 0, NULL); 117 } 118 119 if (res && errorno == ERROR_BAD_EXE_FORMAT && strstr(lib->errmsg, "%1")) { 120 msg = lib->errmsg; 121 lib->errmsg = NULL; 122 arg = (DWORD_PTR) filename; 123 res = FormatMessageA(FORMAT_MESSAGE_ALLOCATE_BUFFER | 124 FORMAT_MESSAGE_ARGUMENT_ARRAY | 125 FORMAT_MESSAGE_FROM_STRING, 126 msg, 127 0, 0, (LPSTR) &lib->errmsg, 0, (va_list*) &arg); 128 LocalFree(msg); 129 } 130 131 if (!res) 132 uv__format_fallback_error(lib, errorno); 133 134 return -1; 135} 136