Mercurial > cpython-lru_cache-weakref

annotate Python/dynload_shlib.c @ 18065:889db6d55506 legacy-trunk

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SF bug 430991: wrong co_lnotab Armin Rigo pointed out that the way the line-# table got built didn't work for lines generating more than 255 bytes of bytecode. Fixed as he suggested, plus corresponding changes to pyassem.py, plus added some long overdue docs about this subtle table to compile.c. Bugfix candidate (line numbers may be off in tracebacks under -O).
author Tim Peters <tim.peters@gmail.com>
date Sat, 09 Jun 2001 09:26:21 +0000
parents 3b9b8f2ddfe7
children 11cb3de0823d 064de84385ca
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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 #ifdef __OpenBSD__
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20 #define LEAD_UNDERSCORE "_"
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21 #else
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22 #define LEAD_UNDERSCORE ""
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23 #endif
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24
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25 #ifndef RTLD_LAZY
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26 #define RTLD_LAZY 1
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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
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57 if (strchr(pathname, '/') == NULL) {
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58 /* Prefix bare filename with "./" */
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59 sprintf(pathbuf, "./%-.255s", pathname);
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60 pathname = pathbuf;
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61 }
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62
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63 sprintf(funcname, LEAD_UNDERSCORE "init%.200s", shortname);
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65 if (fp != NULL) {
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66 int i;
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67 struct stat statb;
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68 fstat(fileno(fp), &statb);
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69 for (i = 0; i < nhandles; i++) {
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70 if (statb.st_dev == handles[i].dev &&
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71 statb.st_ino == handles[i].ino) {
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72 p = (dl_funcptr) dlsym(handles[i].handle,
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73 funcname);
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74 return p;
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75 }
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76 }
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77 if (nhandles < 128) {
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78 handles[nhandles].dev = statb.st_dev;
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79 handles[nhandles].ino = statb.st_ino;
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80 }
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81 }
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82
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83 #ifdef RTLD_NOW
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84 /* RTLD_NOW: resolve externals now
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85 (i.e. core dump now if some are missing) */
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86 handle = dlopen(pathname, RTLD_NOW);
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87 #else
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88 if (Py_VerboseFlag)
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89 printf("dlopen(\"%s\", %d);\n", pathname,
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90 RTLD_LAZY);
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91 handle = dlopen(pathname, RTLD_LAZY);
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92 #endif /* RTLD_NOW */
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93 if (handle == NULL) {
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94 PyErr_SetString(PyExc_ImportError, dlerror());
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95 return NULL;
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96 }
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97 if (fp != NULL && nhandles < 128)
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98 handles[nhandles++].handle = handle;
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99 p = (dl_funcptr) dlsym(handle, funcname);
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100 return p;
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101 }