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annotate Python/dynload_shlib.c @ 68231:5fd74354d73b 2.0

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Close 2.0 branch.
author Georg Brandl <georg@python.org>
date Sat, 05 Mar 2011 14:54:19 +0100
parents 6e9ff060a728
children bbc991ab6d32
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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 #if defined(__NetBSD__) && (NetBSD < 199712)
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10 #include <nlist.h>
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11 #include <link.h>
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12 #define dlerror() "error in dynamic linking"
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13 #else
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14 #ifdef HAVE_DLFCN_H
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15 #include <dlfcn.h>
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16 #endif
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17 #endif
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18
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19 #ifndef RTLD_LAZY
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20 #define RTLD_LAZY 1
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21 #endif
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22
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23
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24 const struct filedescr _PyImport_DynLoadFiletab[] = {
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25 #ifdef __CYGWIN__
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26 {".pyd", "rb", C_EXTENSION},
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27 {".dll", "rb", C_EXTENSION},
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28 #else
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29 {".so", "rb", C_EXTENSION},
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30 {"module.so", "rb", C_EXTENSION},
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31 #endif
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32 {0, 0}
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33 };
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34
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35 static struct {
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36 dev_t dev;
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37 ino_t ino;
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38 void *handle;
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39 } handles[128];
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40 static int nhandles = 0;
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41
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42
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43 dl_funcptr _PyImport_GetDynLoadFunc(const char *fqname, const char *shortname,
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44 const char *pathname, FILE *fp)
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45 {
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46 dl_funcptr p;
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47 void *handle;
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48 char funcname[258];
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49 char pathbuf[260];
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50
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51 if (strchr(pathname, '/') == NULL) {
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52 /* Prefix bare filename with "./" */
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53 sprintf(pathbuf, "./%-.255s", pathname);
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54 pathname = pathbuf;
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55 }
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56
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57 /* ### should there be a leading underscore for some platforms? */
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58 sprintf(funcname, "init%.200s", shortname);
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59
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60 if (fp != NULL) {
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61 int i;
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62 struct stat statb;
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63 fstat(fileno(fp), &statb);
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64 for (i = 0; i < nhandles; i++) {
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65 if (statb.st_dev == handles[i].dev &&
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66 statb.st_ino == handles[i].ino) {
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67 p = (dl_funcptr) dlsym(handles[i].handle,
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68 funcname);
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69 return p;
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70 }
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71 }
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72 if (nhandles < 128) {
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73 handles[nhandles].dev = statb.st_dev;
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74 handles[nhandles].ino = statb.st_ino;
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75 }
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76 }
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77
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78 #ifdef RTLD_NOW
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79 /* RTLD_NOW: resolve externals now
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80 (i.e. core dump now if some are missing) */
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81 handle = dlopen(pathname, RTLD_NOW);
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82 #else
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83 if (Py_VerboseFlag)
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84 printf("dlopen(\"%s\", %d);\n", pathname,
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85 RTLD_LAZY);
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86 handle = dlopen(pathname, RTLD_LAZY);
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87 #endif /* RTLD_NOW */
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88 if (handle == NULL) {
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89 PyErr_SetString(PyExc_ImportError, dlerror());
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90 return NULL;
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91 }
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92 if (fp != NULL && nhandles < 128)
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93 handles[nhandles++].handle = handle;
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94 p = (dl_funcptr) dlsym(handle, funcname);
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95 return p;
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96 }