Mercurial > cpython-lru_cache-weakref

annotate Python/dynload_win.c @ 49955:878d40468c4e legacy-trunk

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Issue #4384: Added logging integration with warnings module using captureWarnings(). This change includes a NullHandler which does nothing; it will be of use to library developers who want to avoid the "No handlers could be found for logger XXX" message which can appear if the library user doesn't configure logging.
author Vinay Sajip <vinay_sajip@yahoo.co.uk>
date Wed, 03 Dec 2008 23:22:58 +0000
parents 005921fcff43
children 1434d1bc667f
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
11599
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
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1
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
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2 /* Support for dynamic loading of extension modules */
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3
44462
76a89dd4a512 Moved include "Python.h" in front of other imports to silence a warning.
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4 #include "Python.h"
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5
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42808526511c Patch #1495999: Part two of Windows CE changes.
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6 #ifdef HAVE_DIRECT_H
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7 #include <direct.h>
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8 #endif
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9 #include <ctype.h>
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10
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
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11 #include "importdl.h"
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9d02a4adf574 Merged revisions 55631-55794 via svnmerge from
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12 #include <windows.h>
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13
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14 const struct filedescr _PyImport_DynLoadFiletab[] = {
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
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15 #ifdef _DEBUG
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16 {"_d.pyd", "rb", C_EXTENSION},
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17 #else
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18 {".pyd", "rb", C_EXTENSION},
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19 #endif
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20 {0, 0}
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21 };
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22
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23
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24 /* Case insensitive string compare, to avoid any dependencies on particular
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25 C RTL implementations */
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26
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27 static int strcasecmp (char *string1, char *string2)
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28 {
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29 int first, second;
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30
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31 do {
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32 first = tolower(*string1);
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33 second = tolower(*string2);
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34 string1++;
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35 string2++;
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36 } while (first && first == second);
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37
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38 return (first - second);
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39 }
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41
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42 /* Function to return the name of the "python" DLL that the supplied module
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43 directly imports. Looks through the list of imported modules and
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44 returns the first entry that starts with "python" (case sensitive) and
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45 is followed by nothing but numbers until the separator (period).
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46
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47 Returns a pointer to the import name, or NULL if no matching name was
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48 located.
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49
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50 This function parses through the PE header for the module as loaded in
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51 memory by the system loader. The PE header is accessed as documented by
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52 Microsoft in the MSDN PE and COFF specification (2/99), and handles
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53 both PE32 and PE32+. It only worries about the direct import table and
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54 not the delay load import table since it's unlikely an extension is
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55 going to be delay loading Python (after all, it's already loaded).
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56
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57 If any magic values are not found (e.g., the PE header or optional
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58 header magic), then this function simply returns NULL. */
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59
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60 #define DWORD_AT(mem) (*(DWORD *)(mem))
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61 #define WORD_AT(mem) (*(WORD *)(mem))
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62
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63 static char *GetPythonImport (HINSTANCE hModule)
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64 {
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65 unsigned char *dllbase, *import_data, *import_name;
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66 DWORD pe_offset, opt_offset;
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67 WORD opt_magic;
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68 int num_dict_off, import_off;
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69
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70 /* Safety check input */
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71 if (hModule == NULL) {
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72 return NULL;
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73 }
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74
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75 /* Module instance is also the base load address. First portion of
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76 memory is the MS-DOS loader, which holds the offset to the PE
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77 header (from the load base) at 0x3C */
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78 dllbase = (unsigned char *)hModule;
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79 pe_offset = DWORD_AT(dllbase + 0x3C);
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80
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81 /* The PE signature must be "PE\0\0" */
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82 if (memcmp(dllbase+pe_offset,"PE\0\0",4)) {
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83 return NULL;
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84 }
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85
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86 /* Following the PE signature is the standard COFF header (20
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87 bytes) and then the optional header. The optional header starts
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88 with a magic value of 0x10B for PE32 or 0x20B for PE32+ (PE32+
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89 uses 64-bits for some fields). It might also be 0x107 for a ROM
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90 image, but we don't process that here.
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91
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92 The optional header ends with a data dictionary that directly
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93 points to certain types of data, among them the import entries
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94 (in the second table entry). Based on the header type, we
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95 determine offsets for the data dictionary count and the entry
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96 within the dictionary pointing to the imports. */
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97
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98 opt_offset = pe_offset + 4 + 20;
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99 opt_magic = WORD_AT(dllbase+opt_offset);
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100 if (opt_magic == 0x10B) {
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101 /* PE32 */
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102 num_dict_off = 92;
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103 import_off = 104;
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104 } else if (opt_magic == 0x20B) {
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105 /* PE32+ */
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106 num_dict_off = 108;
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107 import_off = 120;
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108 } else {
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109 /* Unsupported */
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110 return NULL;
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111 }
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112
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113 /* Now if an import table exists, offset to it and walk the list of
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114 imports. The import table is an array (ending when an entry has
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115 empty values) of structures (20 bytes each), which contains (at
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116 offset 12) a relative address (to the module base) at which a
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117 string constant holding the import name is located. */
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118
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119 if (DWORD_AT(dllbase + opt_offset + num_dict_off) >= 2) {
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120 /* We have at least 2 tables - the import table is the second
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121 one. But still it may be that the table size is zero */
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122 if (0 == DWORD_AT(dllbase + opt_offset + import_off + sizeof(DWORD)))
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Thomas Heller <theller@ctypes.org>
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diff changeset
123 return NULL;
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124 import_data = dllbase + DWORD_AT(dllbase +
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125 opt_offset +
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126 import_off);
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127 while (DWORD_AT(import_data)) {
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128 import_name = dllbase + DWORD_AT(import_data+12);
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129 if (strlen(import_name) >= 6 &&
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130 !strncmp(import_name,"python",6)) {
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131 char *pch;
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132
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133 /* Ensure python prefix is followed only
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134 by numbers to the end of the basename */
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135 pch = import_name + 6;
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136 #ifdef _DEBUG
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diff changeset
137 while (*pch && pch[0] != '_' && pch[1] != 'd' && pch[2] != '.') {
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diff changeset
138 #else
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diff changeset
139 while (*pch && *pch != '.') {
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diff changeset
140 #endif
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141 if (*pch >= '0' && *pch <= '9') {
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142 pch++;
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143 } else {
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144 pch = NULL;
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145 break;
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146 }
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147 }
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148
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149 if (pch) {
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150 /* Found it - return the name */
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151 return import_name;
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152 }
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153 }
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154 import_data += 20;
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155 }
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diff changeset
156 }
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diff changeset
157
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158 return NULL;
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159 }
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160
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diff changeset
161
11618
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diff changeset
162 dl_funcptr _PyImport_GetDynLoadFunc(const char *fqname, const char *shortname,
11599
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parents:
diff changeset
163 const char *pathname, FILE *fp)
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
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parents:
diff changeset
164 {
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
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parents:
diff changeset
165 dl_funcptr p;
15027
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166 char funcname[258], *import_python;
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parents: 11599
diff changeset
167
21077
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168 PyOS_snprintf(funcname, sizeof(funcname), "init%.200s", shortname);
11599
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parents:
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169
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
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parents:
diff changeset
170 {
17713
5e3bab8aef7b Always pass a full path name to LoadLibraryEx(). Fixes some Windows 9x problems. As discussed on python-dev
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171 HINSTANCE hDLL = NULL;
11599
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parents:
diff changeset
172 char pathbuf[260];
17713
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173 LPTSTR dummy;
44891
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Christian Heimes <christian@cheimes.de>
parents: 44462
diff changeset
174 unsigned int old_mode;
17713
5e3bab8aef7b Always pass a full path name to LoadLibraryEx(). Fixes some Windows 9x problems. As discussed on python-dev
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diff changeset
175 /* We use LoadLibraryEx so Windows looks for dependent DLLs
5e3bab8aef7b Always pass a full path name to LoadLibraryEx(). Fixes some Windows 9x problems. As discussed on python-dev
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diff changeset
176 in directory of pathname first. However, Windows95
5e3bab8aef7b Always pass a full path name to LoadLibraryEx(). Fixes some Windows 9x problems. As discussed on python-dev
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parents: 15027
diff changeset
177 can sometimes not work correctly unless the absolute
5e3bab8aef7b Always pass a full path name to LoadLibraryEx(). Fixes some Windows 9x problems. As discussed on python-dev
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diff changeset
178 path is used. If GetFullPathName() fails, the LoadLibrary
5e3bab8aef7b Always pass a full path name to LoadLibraryEx(). Fixes some Windows 9x problems. As discussed on python-dev
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179 will certainly fail too, so use its error code */
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diff changeset
180
005921fcff43 Applied #1069410
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diff changeset
181 /* Don't display a message box when Python can't load a DLL */
005921fcff43 Applied #1069410
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diff changeset
182 old_mode = SetErrorMode(SEM_FAILCRITICALERRORS);
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parents: 44462
diff changeset
183
17713
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diff changeset
184 if (GetFullPathName(pathname,
5e3bab8aef7b Always pass a full path name to LoadLibraryEx(). Fixes some Windows 9x problems. As discussed on python-dev
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diff changeset
185 sizeof(pathbuf),
5e3bab8aef7b Always pass a full path name to LoadLibraryEx(). Fixes some Windows 9x problems. As discussed on python-dev
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diff changeset
186 pathbuf,
5e3bab8aef7b Always pass a full path name to LoadLibraryEx(). Fixes some Windows 9x problems. As discussed on python-dev
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diff changeset
187 &dummy))
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diff changeset
188 /* XXX This call doesn't exist in Windows CE */
5e3bab8aef7b Always pass a full path name to LoadLibraryEx(). Fixes some Windows 9x problems. As discussed on python-dev
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parents: 15027
diff changeset
189 hDLL = LoadLibraryEx(pathname, NULL,
5e3bab8aef7b Always pass a full path name to LoadLibraryEx(). Fixes some Windows 9x problems. As discussed on python-dev
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diff changeset
190 LOAD_WITH_ALTERED_SEARCH_PATH);
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diff changeset
191
005921fcff43 Applied #1069410
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diff changeset
192 /* restore old error mode settings */
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diff changeset
193 SetErrorMode(old_mode);
005921fcff43 Applied #1069410
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diff changeset
194
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195 if (hDLL==NULL){
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diff changeset
196 char errBuf[256];
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diff changeset
197 unsigned int errorCode;
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diff changeset
198
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
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diff changeset
199 /* Get an error string from Win32 error code */
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parents:
diff changeset
200 char theInfo[256]; /* Pointer to error text
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
Guido van Rossum <guido@python.org>
parents:
diff changeset
201 from system */
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
Guido van Rossum <guido@python.org>
parents:
diff changeset
202 int theLength; /* Length of error text */
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
Guido van Rossum <guido@python.org>
parents:
diff changeset
203
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
Guido van Rossum <guido@python.org>
parents:
diff changeset
204 errorCode = GetLastError();
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
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parents:
diff changeset
205
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
Guido van Rossum <guido@python.org>
parents:
diff changeset
206 theLength = FormatMessage(
44455
de00af03bb4d Partial port of r59682 from py3k.
Amaury Forgeot d'Arc <amauryfa@gmail.com>
parents: 41969
diff changeset
207 FORMAT_MESSAGE_FROM_SYSTEM |
de00af03bb4d Partial port of r59682 from py3k.
Amaury Forgeot d'Arc <amauryfa@gmail.com>
parents: 41969
diff changeset
208 FORMAT_MESSAGE_IGNORE_INSERTS, /* flags */
11599
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parents:
diff changeset
209 NULL, /* message source */
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
Guido van Rossum <guido@python.org>
parents:
diff changeset
210 errorCode, /* the message (error) ID */
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
Guido van Rossum <guido@python.org>
parents:
diff changeset
211 0, /* default language environment */
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
Guido van Rossum <guido@python.org>
parents:
diff changeset
212 (LPTSTR) theInfo, /* the buffer */
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
Guido van Rossum <guido@python.org>
parents:
diff changeset
213 sizeof(theInfo), /* the buffer size */
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
Guido van Rossum <guido@python.org>
parents:
diff changeset
214 NULL); /* no additional format args. */
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
Guido van Rossum <guido@python.org>
parents:
diff changeset
215
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
Guido van Rossum <guido@python.org>
parents:
diff changeset
216 /* Problem: could not get the error message.
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
Guido van Rossum <guido@python.org>
parents:
diff changeset
217 This should not happen if called correctly. */
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
Guido van Rossum <guido@python.org>
parents:
diff changeset
218 if (theLength == 0) {
21077
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Jeremy Hylton <jeremy@alum.mit.edu>
parents: 21066
diff changeset
219 PyOS_snprintf(errBuf, sizeof(errBuf),
379fc66f4c96 Use PyOS_snprintf instead of sprintf.
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 21066
diff changeset
220 "DLL load failed with error code %d",
379fc66f4c96 Use PyOS_snprintf instead of sprintf.
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 21066
diff changeset
221 errorCode);
11599
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
Guido van Rossum <guido@python.org>
parents:
diff changeset
222 } else {
13096
8c8de5b736dc Trent Mick's Win64 changes: size_t vs. int or long; also some overflow
Guido van Rossum <guido@python.org>
parents: 11618
diff changeset
223 size_t len;
11599
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
Guido van Rossum <guido@python.org>
parents:
diff changeset
224 /* For some reason a \r\n
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
Guido van Rossum <guido@python.org>
parents:
diff changeset
225 is appended to the text */
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
Guido van Rossum <guido@python.org>
parents:
diff changeset
226 if (theLength >= 2 &&
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
Guido van Rossum <guido@python.org>
parents:
diff changeset
227 theInfo[theLength-2] == '\r' &&
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
Guido van Rossum <guido@python.org>
parents:
diff changeset
228 theInfo[theLength-1] == '\n') {
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
Guido van Rossum <guido@python.org>
parents:
diff changeset
229 theLength -= 2;
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
Guido van Rossum <guido@python.org>
parents:
diff changeset
230 theInfo[theLength] = '\0';
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
Guido van Rossum <guido@python.org>
parents:
diff changeset
231 }
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
Guido van Rossum <guido@python.org>
parents:
diff changeset
232 strcpy(errBuf, "DLL load failed: ");
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
Guido van Rossum <guido@python.org>
parents:
diff changeset
233 len = strlen(errBuf);
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
Guido van Rossum <guido@python.org>
parents:
diff changeset
234 strncpy(errBuf+len, theInfo,
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
Guido van Rossum <guido@python.org>
parents:
diff changeset
235 sizeof(errBuf)-len);
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
Guido van Rossum <guido@python.org>
parents:
diff changeset
236 errBuf[sizeof(errBuf)-1] = '\0';
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
Guido van Rossum <guido@python.org>
parents:
diff changeset
237 }
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
Guido van Rossum <guido@python.org>
parents:
diff changeset
238 PyErr_SetString(PyExc_ImportError, errBuf);
25041
ed0b02672f09 Fix a couple of whitespace consistency nits.
Fred Drake <fdrake@acm.org>
parents: 24071
diff changeset
239 return NULL;
15027
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diff changeset
240 } else {
5ffa515e620e Detect conflicting Python DLL on module import under Windows - as per [ Patch #101676 ]
Mark Hammond <mhammond@skippinet.com.au>
parents: 14375
diff changeset
241 char buffer[256];
5ffa515e620e Detect conflicting Python DLL on module import under Windows - as per [ Patch #101676 ]
Mark Hammond <mhammond@skippinet.com.au>
parents: 14375
diff changeset
242
32469
b8710e6d8d78 When importing an extension on Windows, the code reads the PE 'import
Thomas Heller <theller@ctypes.org>
parents: 25041
diff changeset
243 #ifdef _DEBUG
b8710e6d8d78 When importing an extension on Windows, the code reads the PE 'import
Thomas Heller <theller@ctypes.org>
parents: 25041
diff changeset
244 PyOS_snprintf(buffer, sizeof(buffer), "python%d%d_d.dll",
b8710e6d8d78 When importing an extension on Windows, the code reads the PE 'import
Thomas Heller <theller@ctypes.org>
parents: 25041
diff changeset
245 #else
21077
379fc66f4c96 Use PyOS_snprintf instead of sprintf.
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 21066
diff changeset
246 PyOS_snprintf(buffer, sizeof(buffer), "python%d%d.dll",
32469
b8710e6d8d78 When importing an extension on Windows, the code reads the PE 'import
Thomas Heller <theller@ctypes.org>
parents: 25041
diff changeset
247 #endif
25041
ed0b02672f09 Fix a couple of whitespace consistency nits.
Fred Drake <fdrake@acm.org>
parents: 24071
diff changeset
248 PY_MAJOR_VERSION,PY_MINOR_VERSION);
15027
5ffa515e620e Detect conflicting Python DLL on module import under Windows - as per [ Patch #101676 ]
Mark Hammond <mhammond@skippinet.com.au>
parents: 14375
diff changeset
249 import_python = GetPythonImport(hDLL);
5ffa515e620e Detect conflicting Python DLL on module import under Windows - as per [ Patch #101676 ]
Mark Hammond <mhammond@skippinet.com.au>
parents: 14375
diff changeset
250
5ffa515e620e Detect conflicting Python DLL on module import under Windows - as per [ Patch #101676 ]
Mark Hammond <mhammond@skippinet.com.au>
parents: 14375
diff changeset
251 if (import_python &&
5ffa515e620e Detect conflicting Python DLL on module import under Windows - as per [ Patch #101676 ]
Mark Hammond <mhammond@skippinet.com.au>
parents: 14375
diff changeset
252 strcasecmp(buffer,import_python)) {
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379fc66f4c96 Use PyOS_snprintf instead of sprintf.
Jeremy Hylton <jeremy@alum.mit.edu>
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253 PyOS_snprintf(buffer, sizeof(buffer),
379fc66f4c96 Use PyOS_snprintf instead of sprintf.
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 21066
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254 "Module use of %.150s conflicts "
379fc66f4c96 Use PyOS_snprintf instead of sprintf.
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 21066
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255 "with this version of Python.",
379fc66f4c96 Use PyOS_snprintf instead of sprintf.
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 21066
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256 import_python);
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5ffa515e620e Detect conflicting Python DLL on module import under Windows - as per [ Patch #101676 ]
Mark Hammond <mhammond@skippinet.com.au>
parents: 14375
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257 PyErr_SetString(PyExc_ImportError,buffer);
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Mark Hammond <mhammond@skippinet.com.au>
parents: 14375
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258 FreeLibrary(hDLL);
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Mark Hammond <mhammond@skippinet.com.au>
parents: 14375
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259 return NULL;
5ffa515e620e Detect conflicting Python DLL on module import under Windows - as per [ Patch #101676 ]
Mark Hammond <mhammond@skippinet.com.au>
parents: 14375
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260 }
11599
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
Guido van Rossum <guido@python.org>
parents:
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261 }
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
Guido van Rossum <guido@python.org>
parents:
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262 p = GetProcAddress(hDLL, funcname);
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Guido van Rossum <guido@python.org>
parents:
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263 }
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
Guido van Rossum <guido@python.org>
parents:
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264
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
Guido van Rossum <guido@python.org>
parents:
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265 return p;
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
Guido van Rossum <guido@python.org>
parents:
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266 }