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annotate Python/dynload_shlib.c @ 68235:61b0263d6881 2.2

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author Georg Brandl <georg@python.org>
date Sat, 05 Mar 2011 14:55:23 +0100
parents 379fc66f4c96
children 5cbcfde3ad55
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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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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
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30 const struct filedescr _PyImport_DynLoadFiletab[] = {
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31 #ifdef __CYGWIN__
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32 {".dll", "rb", C_EXTENSION},
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33 {"module.dll", "rb", C_EXTENSION},
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34 #else
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35 {".so", "rb", C_EXTENSION},
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36 {"module.so", "rb", C_EXTENSION},
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37 #endif
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38 {0, 0}
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39 };
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40
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41 static struct {
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42 dev_t dev;
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43 ino_t ino;
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44 void *handle;
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45 } handles[128];
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46 static int nhandles = 0;
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47
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48
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49 dl_funcptr _PyImport_GetDynLoadFunc(const char *fqname, const char *shortname,
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50 const char *pathname, FILE *fp)
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51 {
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52 dl_funcptr p;
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53 void *handle;
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54 char funcname[258];
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55 char pathbuf[260];
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56 int dlopenflags=0;
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57
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58 if (strchr(pathname, '/') == NULL) {
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59 /* Prefix bare filename with "./" */
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60 PyOS_snprintf(pathbuf, sizeof(pathbuf), "./%-.255s", pathname);
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61 pathname = pathbuf;
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62 }
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63
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64 PyOS_snprintf(funcname, sizeof(funcname),
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65 LEAD_UNDERSCORE "init%.200s", shortname);
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66
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67 if (fp != NULL) {
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68 int i;
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69 struct stat statb;
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70 fstat(fileno(fp), &statb);
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71 for (i = 0; i < nhandles; i++) {
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72 if (statb.st_dev == handles[i].dev &&
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73 statb.st_ino == handles[i].ino) {
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74 p = (dl_funcptr) dlsym(handles[i].handle,
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75 funcname);
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76 return p;
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77 }
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78 }
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79 if (nhandles < 128) {
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80 handles[nhandles].dev = statb.st_dev;
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81 handles[nhandles].ino = statb.st_ino;
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82 }
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83 }
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84
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85 dlopenflags = PyThreadState_Get()->interp->dlopenflags;
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86
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87 if (Py_VerboseFlag)
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88 printf("dlopen(\"%s\", %x);\n", pathname, dlopenflags);
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89
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90 handle = dlopen(pathname, dlopenflags);
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91
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92 if (handle == NULL) {
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93 PyErr_SetString(PyExc_ImportError, dlerror());
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94 return NULL;
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95 }
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96 if (fp != NULL && nhandles < 128)
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97 handles[nhandles++].handle = handle;
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98 p = (dl_funcptr) dlsym(handle, funcname);
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99 return p;
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100 }