Mercurial > cpython-lru_cache-weakref

annotate Python/dynload_shlib.c @ 33318:b57612f61ba3 legacy-trunk

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author Martin v. Löwis <martin@v.loewis.de>
date Sun, 29 Aug 2004 15:51:52 +0000
parents e6379bda91d7
children 0bfd35a76a44
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1
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2 /* Support for dynamic loading of extension modules */
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3
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4 #include "Python.h"
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5 #include "importdl.h"
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6
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7 #include <sys/types.h>
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8 #include <sys/stat.h>
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9
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10 #if defined(__NetBSD__)
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11 #include <sys/param.h>
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12 #if (NetBSD < 199712)
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13 #include <nlist.h>
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14 #include <link.h>
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15 #define dlerror() "error in dynamic linking"
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16 #endif
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17 #endif /* NetBSD */
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18
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19 #ifdef HAVE_DLFCN_H
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20 #include <dlfcn.h>
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21 #else
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22 #if defined(PYOS_OS2) && defined(PYCC_GCC)
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23 #include "dlfcn.h"
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24 #endif
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25 #endif
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26
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27 #if (defined(__OpenBSD__) || defined(__NetBSD__)) && !defined(__ELF__)
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28 #define LEAD_UNDERSCORE "_"
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29 #else
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30 #define LEAD_UNDERSCORE ""
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31 #endif
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33
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34 const struct filedescr _PyImport_DynLoadFiletab[] = {
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35 #ifdef __CYGWIN__
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36 {".dll", "rb", C_EXTENSION},
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37 {"module.dll", "rb", C_EXTENSION},
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38 #else
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39 #if defined(PYOS_OS2) && defined(PYCC_GCC)
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40 {".pyd", "rb", C_EXTENSION},
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41 {".dll", "rb", C_EXTENSION},
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42 #else
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43 #ifdef __VMS
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44 {".exe", "rb", C_EXTENSION},
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45 {".EXE", "rb", C_EXTENSION},
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46 {"module.exe", "rb", C_EXTENSION},
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47 {"MODULE.EXE", "rb", C_EXTENSION},
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48 #else
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49 {".so", "rb", C_EXTENSION},
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50 {"module.so", "rb", C_EXTENSION},
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51 #endif
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52 #endif
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53 #endif
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54 {0, 0}
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55 };
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56
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57 static struct {
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58 dev_t dev;
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59 #ifdef __VMS
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60 ino_t ino[3];
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61 #else
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62 ino_t ino;
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63 #endif
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64 void *handle;
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65 } handles[128];
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66 static int nhandles = 0;
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67
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68
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69 dl_funcptr _PyImport_GetDynLoadFunc(const char *fqname, const char *shortname,
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70 const char *pathname, FILE *fp)
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71 {
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72 dl_funcptr p;
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73 void *handle;
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74 char funcname[258];
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75 char pathbuf[260];
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76 int dlopenflags=0;
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77
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78 if (strchr(pathname, '/') == NULL) {
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79 /* Prefix bare filename with "./" */
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80 PyOS_snprintf(pathbuf, sizeof(pathbuf), "./%-.255s", pathname);
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81 pathname = pathbuf;
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82 }
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83
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84 PyOS_snprintf(funcname, sizeof(funcname),
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85 LEAD_UNDERSCORE "init%.200s", shortname);
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86
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87 if (fp != NULL) {
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88 int i;
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89 struct stat statb;
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90 fstat(fileno(fp), &statb);
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91 for (i = 0; i < nhandles; i++) {
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92 if (statb.st_dev == handles[i].dev &&
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93 statb.st_ino == handles[i].ino) {
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94 p = (dl_funcptr) dlsym(handles[i].handle,
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95 funcname);
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96 return p;
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97 }
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98 }
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99 if (nhandles < 128) {
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100 handles[nhandles].dev = statb.st_dev;
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101 #ifdef __VMS
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102 handles[nhandles].ino[0] = statb.st_ino[0];
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103 handles[nhandles].ino[1] = statb.st_ino[1];
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104 handles[nhandles].ino[2] = statb.st_ino[2];
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105 #else
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106 handles[nhandles].ino = statb.st_ino;
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107 #endif
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108 }
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109 }
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110
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111 #if !(defined(PYOS_OS2) && defined(PYCC_GCC))
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112 dlopenflags = PyThreadState_GET()->interp->dlopenflags;
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113 #endif
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114
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115 if (Py_VerboseFlag)
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116 printf("dlopen(\"%s\", %x);\n", pathname, dlopenflags);
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117
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118 #ifdef __VMS
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119 /* VMS currently don't allow a pathname, use a logical name instead */
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120 /* Concatenate 'python_module_' and shortname */
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121 /* so "import vms.bar" will use the logical python_module_bar */
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122 /* As C module use only one name space this is probably not a */
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123 /* important limitation */
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124 PyOS_snprintf(pathbuf, sizeof(pathbuf), "python_module_%-.200s",
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125 shortname);
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Martin v. Löwis <martin@v.loewis.de>
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126 pathname = pathbuf;
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127 #endif
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Martin v. Löwis <martin@v.loewis.de>
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128
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064de84385ca Patch #412229: Add functions sys.getdlopenflags and sys.setdlopenflags.
Martin v. Löwis <martin@v.loewis.de>
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129 handle = dlopen(pathname, dlopenflags);
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130
11599
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
Guido van Rossum <guido@python.org>
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131 if (handle == NULL) {
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132 PyErr_SetString(PyExc_ImportError, dlerror());
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133 return NULL;
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Guido van Rossum <guido@python.org>
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134 }
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135 if (fp != NULL && nhandles < 128)
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Guido van Rossum <guido@python.org>
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136 handles[nhandles++].handle = handle;
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137 p = (dl_funcptr) dlsym(handle, funcname);
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Guido van Rossum <guido@python.org>
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138 return p;
78fe87ce0ded The old platform-specific contents of importdl.c, broken down into one
Guido van Rossum <guido@python.org>
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139 }