xref: /third_party/node/deps/uv/src/win/dl.c (revision 1cb0ef41) 
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
31  lib->handle = NULL;
32  lib->errmsg = NULL;
33
34  if (!MultiByteToWideChar(CP_UTF8,
35                           0,
36                           filename,
37                           -1,
38                           filename_w,
39                           ARRAY_SIZE(filename_w))) {
40    return uv__dlerror(lib, filename, GetLastError());
41  }
42
43  lib->handle = LoadLibraryExW(filename_w, NULL, LOAD_WITH_ALTERED_SEARCH_PATH);
44  if (lib->handle == NULL) {
45    return uv__dlerror(lib, filename, GetLastError());
46  }
47
48  return 0;
49}
50
51
52void uv_dlclose(uv_lib_t* lib) {
53  if (lib->errmsg) {
54    LocalFree((void*)lib->errmsg);
55    lib->errmsg = NULL;
56  }
57
58  if (lib->handle) {
59    /* Ignore errors. No good way to signal them without leaking memory. */
60    FreeLibrary(lib->handle);
61    lib->handle = NULL;
62  }
63}
64
65
66int uv_dlsym(uv_lib_t* lib, const char* name, void** ptr) {
67  /* Cast though integer to suppress pedantic warning about forbidden cast. */
68  *ptr = (void*)(uintptr_t) GetProcAddress(lib->handle, name);
69  return uv__dlerror(lib, "", *ptr ? 0 : GetLastError());
70}
71
72
73const char* uv_dlerror(const uv_lib_t* lib) {
74  return lib->errmsg ? lib->errmsg : "no error";
75}
76
77
78static void uv__format_fallback_error(uv_lib_t* lib, int errorno){
79  static const CHAR fallback_error[] = "error: %1!d!";
80  DWORD_PTR args[1];
81  args[0] = (DWORD_PTR) errorno;
82
83  FormatMessageA(FORMAT_MESSAGE_FROM_STRING |
84                 FORMAT_MESSAGE_ARGUMENT_ARRAY |
85                 FORMAT_MESSAGE_ALLOCATE_BUFFER,
86                 fallback_error, 0, 0,
87                 (LPSTR) &lib->errmsg,
88                 0, (va_list*) args);
89}
90
91
92
93static int uv__dlerror(uv_lib_t* lib, const char* filename, DWORD errorno) {
94  DWORD_PTR arg;
95  DWORD res;
96  char* msg;
97
98  if (lib->errmsg) {
99    LocalFree(lib->errmsg);
100    lib->errmsg = NULL;
101  }
102
103  if (errorno == 0)
104    return 0;
105
106  res = FormatMessageA(FORMAT_MESSAGE_ALLOCATE_BUFFER |
107                       FORMAT_MESSAGE_FROM_SYSTEM |
108                       FORMAT_MESSAGE_IGNORE_INSERTS, NULL, errorno,
109                       MAKELANGID(LANG_ENGLISH, SUBLANG_ENGLISH_US),
110                       (LPSTR) &lib->errmsg, 0, NULL);
111
112  if (!res && (GetLastError() == ERROR_MUI_FILE_NOT_FOUND ||
113               GetLastError() == ERROR_RESOURCE_TYPE_NOT_FOUND)) {
114    res = FormatMessageA(FORMAT_MESSAGE_ALLOCATE_BUFFER |
115                         FORMAT_MESSAGE_FROM_SYSTEM |
116                         FORMAT_MESSAGE_IGNORE_INSERTS, NULL, errorno,
117                         0, (LPSTR) &lib->errmsg, 0, NULL);
118  }
119
120  if (res && errorno == ERROR_BAD_EXE_FORMAT && strstr(lib->errmsg, "%1")) {
121    msg = lib->errmsg;
122    lib->errmsg = NULL;
123    arg = (DWORD_PTR) filename;
124    res = FormatMessageA(FORMAT_MESSAGE_ALLOCATE_BUFFER |
125                         FORMAT_MESSAGE_ARGUMENT_ARRAY |
126                         FORMAT_MESSAGE_FROM_STRING,
127                         msg,
128                         0, 0, (LPSTR) &lib->errmsg, 0, (va_list*) &arg);
129    LocalFree(msg);
130  }
131
132  if (!res)
133    uv__format_fallback_error(lib, errorno);
134
135  return -1;
136}
137