Mercurial > cpython-lru_cache-weakref

annotate Python/dynload_shlib.c @ 13778:f6e4a9dd67cd legacy-trunk

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Rename the "parser" package to "parsers" to be compatible with the PyXML project.
author Fred Drake <fdrake@acm.org>
date Mon, 31 Jul 2000 23:59:54 +0000
parents 87ee82e5c56d
children 6f6f965c5e2d
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1 /***********************************************************
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2 Copyright (c) 2000, BeOpen.com.
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3 Copyright (c) 1995-2000, Corporation for National Research Initiatives.
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4 Copyright (c) 1990-1995, Stichting Mathematisch Centrum.
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5 All rights reserved.
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6
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7 See the file "Misc/COPYRIGHT" for information on usage and
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8 redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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9 ******************************************************************/
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10
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11 /* Support for dynamic loading of extension modules */
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12
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13 #include "Python.h"
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14 #include "importdl.h"
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15
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16 #include <sys/types.h>
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17 #include <sys/stat.h>
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18 #if defined(__NetBSD__) && (NetBSD < 199712)
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19 #include <nlist.h>
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20 #include <link.h>
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21 #define dlerror() "error in dynamic linking"
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22 #else
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23 #ifdef HAVE_DLFCN_H
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24 #include <dlfcn.h>
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25 #endif
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26 #endif
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27
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28 #ifndef RTLD_LAZY
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29 #define RTLD_LAZY 1
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30 #endif
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31
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32
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33 const struct filedescr _PyImport_DynLoadFiletab[] = {
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34 {".so", "rb", C_EXTENSION},
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35 {"module.so", "rb", C_EXTENSION},
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36 {0, 0}
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37 };
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38
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39 static struct {
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40 dev_t dev;
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41 ino_t ino;
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42 void *handle;
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43 } handles[128];
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44 static int nhandles = 0;
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45
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46
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47 dl_funcptr _PyImport_GetDynLoadFunc(const char *fqname, const char *shortname,
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48 const char *pathname, FILE *fp)
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49 {
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50 dl_funcptr p;
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51 void *handle;
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52 char funcname[258];
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53 char pathbuf[260];
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54
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55 if (strchr(pathname, '/') == NULL) {
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56 /* Prefix bare filename with "./" */
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57 sprintf(pathbuf, "./%-.255s", pathname);
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58 pathname = pathbuf;
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59 }
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60
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61 /* ### should there be a leading underscore for some platforms? */
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62 sprintf(funcname, "init%.200s", shortname);
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63
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64 if (fp != NULL) {
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65 int i;
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66 struct stat statb;
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67 fstat(fileno(fp), &statb);
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68 for (i = 0; i < nhandles; i++) {
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69 if (statb.st_dev == handles[i].dev &&
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70 statb.st_ino == handles[i].ino) {
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71 p = (dl_funcptr) dlsym(handles[i].handle,
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72 funcname);
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73 return p;
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74 }
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75 }
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76 if (nhandles < 128) {
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77 handles[nhandles].dev = statb.st_dev;
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78 handles[nhandles].ino = statb.st_ino;
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79 }
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80 }
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81
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82 #ifdef RTLD_NOW
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83 /* RTLD_NOW: resolve externals now
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84 (i.e. core dump now if some are missing) */
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85 handle = dlopen(pathname, RTLD_NOW);
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86 #else
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87 if (Py_VerboseFlag)
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88 printf("dlopen(\"%s\", %d);\n", pathname,
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89 RTLD_LAZY);
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90 handle = dlopen(pathname, RTLD_LAZY);
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91 #endif /* RTLD_NOW */
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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 }