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annotate Python/dynload_shlib.c @ 68233:e849d484029f 2.1

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Close 2.1 branch.
author Georg Brandl <georg@python.org>
date Sat, 05 Mar 2011 14:54:46 +0100
parents 11cb3de0823d
children
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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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19 #ifdef HAVE_DLFCN_H
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20 #include <dlfcn.h>
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21 #endif
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22
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23 #if (defined(__OpenBSD__) || defined(__NetBSD__)) && !defined(__ELF__)
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24 #define LEAD_UNDERSCORE "_"
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25 #else
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26 #define LEAD_UNDERSCORE ""
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27 #endif
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29 #ifndef RTLD_LAZY
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30 #define RTLD_LAZY 1
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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 {".so", "rb", C_EXTENSION},
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40 {"module.so", "rb", C_EXTENSION},
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41 #endif
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42 {0, 0}
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43 };
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44
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45 static struct {
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46 dev_t dev;
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47 ino_t ino;
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48 void *handle;
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49 } handles[128];
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50 static int nhandles = 0;
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51
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52
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53 dl_funcptr _PyImport_GetDynLoadFunc(const char *fqname, const char *shortname,
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54 const char *pathname, FILE *fp)
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55 {
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56 dl_funcptr p;
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57 void *handle;
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58 char funcname[258];
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59 char pathbuf[260];
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60
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61 if (strchr(pathname, '/') == NULL) {
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62 /* Prefix bare filename with "./" */
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63 sprintf(pathbuf, "./%-.255s", pathname);
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64 pathname = pathbuf;
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65 }
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66
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67 sprintf(funcname, LEAD_UNDERSCORE "init%.200s", shortname);
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68
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69 if (fp != NULL) {
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70 int i;
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71 struct stat statb;
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72 fstat(fileno(fp), &statb);
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73 for (i = 0; i < nhandles; i++) {
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74 if (statb.st_dev == handles[i].dev &&
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75 statb.st_ino == handles[i].ino) {
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76 p = (dl_funcptr) dlsym(handles[i].handle,
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77 funcname);
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78 return p;
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79 }
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80 }
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81 if (nhandles < 128) {
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82 handles[nhandles].dev = statb.st_dev;
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83 handles[nhandles].ino = statb.st_ino;
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84 }
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85 }
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86
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87 #ifdef RTLD_NOW
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88 /* RTLD_NOW: resolve externals now
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89 (i.e. core dump now if some are missing) */
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90 handle = dlopen(pathname, RTLD_NOW);
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91 #else
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92 if (Py_VerboseFlag)
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93 printf("dlopen(\"%s\", %d);\n", pathname,
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94 RTLD_LAZY);
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95 handle = dlopen(pathname, RTLD_LAZY);
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96 #endif /* RTLD_NOW */
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97 if (handle == NULL) {
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98 PyErr_SetString(PyExc_ImportError, dlerror());
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99 return NULL;
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100 }
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101 if (fp != NULL && nhandles < 128)
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102 handles[nhandles++].handle = handle;
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103 p = (dl_funcptr) dlsym(handle, funcname);
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104 return p;
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105 }