Mercurial > cpython-lru_cache-weakref

annotate Python/dynload_shlib.c @ 13163:a09e8635534d legacy-trunk

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Don't try to guess the name of a .def file -- if one is supplied, use it, otherwise just generate an '/export:' option.
author Greg Ward <gward@python.net>
date Thu, 29 Jun 2000 23:09:20 +0000
parents 528559a0b2f2
children 916fb024ce94
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1 /***********************************************************
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2 Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam,
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3 The Netherlands.
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4
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5 All Rights Reserved
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6
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7 Permission to use, copy, modify, and distribute this software and its
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8 documentation for any purpose and without fee is hereby granted,
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9 provided that the above copyright notice appear in all copies and that
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10 both that copyright notice and this permission notice appear in
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11 supporting documentation, and that the names of Stichting Mathematisch
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12 Centrum or CWI or Corporation for National Research Initiatives or
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13 CNRI not be used in advertising or publicity pertaining to
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14 distribution of the software without specific, written prior
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15 permission.
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16
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17 While CWI is the initial source for this software, a modified version
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18 is made available by the Corporation for National Research Initiatives
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19 (CNRI) at the Internet address ftp://ftp.python.org.
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20
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21 STICHTING MATHEMATISCH CENTRUM AND CNRI DISCLAIM ALL WARRANTIES WITH
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22 REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF
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23 MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH
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24 CENTRUM OR CNRI BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
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25 DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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26 PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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27 TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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28 PERFORMANCE OF THIS SOFTWARE.
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29
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30 ******************************************************************/
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31
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32 /* Support for dynamic loading of extension modules */
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33
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34 #include "Python.h"
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35 #include "importdl.h"
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36
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37 #include <sys/types.h>
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38 #include <sys/stat.h>
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39 #if defined(__NetBSD__) && (NetBSD < 199712)
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40 #include <nlist.h>
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41 #include <link.h>
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42 #define dlerror() "error in dynamic linking"
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43 #else
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44 #ifdef HAVE_DLFCN_H
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45 #include <dlfcn.h>
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46 #endif
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47 #endif
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48
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49 #ifndef RTLD_LAZY
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50 #define RTLD_LAZY 1
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51 #endif
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52
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53
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54 const struct filedescr _PyImport_DynLoadFiletab[] = {
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55 {".so", "rb", C_EXTENSION},
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56 {"module.so", "rb", C_EXTENSION},
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57 {0, 0}
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58 };
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59
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60 static struct {
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61 dev_t dev;
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62 ino_t ino;
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63 void *handle;
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64 } handles[128];
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65 static int nhandles = 0;
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66
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67
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68 dl_funcptr _PyImport_GetDynLoadFunc(const char *fqname, const char *shortname,
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69 const char *pathname, FILE *fp)
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70 {
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71 dl_funcptr p;
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72 void *handle;
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73 char funcname[258];
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74 char pathbuf[260];
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75
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76 if (strchr(pathname, '/') == NULL) {
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77 /* Prefix bare filename with "./" */
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78 sprintf(pathbuf, "./%-.255s", pathname);
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79 pathname = pathbuf;
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80 }
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81
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82 /* ### should there be a leading underscore for some platforms? */
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83 sprintf(funcname, "init%.200s", shortname);
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84
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85 if (fp != NULL) {
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86 int i;
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87 struct stat statb;
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88 fstat(fileno(fp), &statb);
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89 for (i = 0; i < nhandles; i++) {
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90 if (statb.st_dev == handles[i].dev &&
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91 statb.st_ino == handles[i].ino) {
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92 p = (dl_funcptr) dlsym(handles[i].handle,
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93 funcname);
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94 return p;
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95 }
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96 }
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97 if (nhandles < 128) {
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98 handles[nhandles].dev = statb.st_dev;
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99 handles[nhandles].ino = statb.st_ino;
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100 }
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101 }
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102
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103 #ifdef RTLD_NOW
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104 /* RTLD_NOW: resolve externals now
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105 (i.e. core dump now if some are missing) */
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106 handle = dlopen(pathname, RTLD_NOW);
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107 #else
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108 if (Py_VerboseFlag)
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109 printf("dlopen(\"%s\", %d);\n", pathname,
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110 RTLD_LAZY);
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111 handle = dlopen(pathname, RTLD_LAZY);
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112 #endif /* RTLD_NOW */
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113 if (handle == NULL) {
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114 PyErr_SetString(PyExc_ImportError, dlerror());
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115 return NULL;
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116 }
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117 if (fp != NULL && nhandles < 128)
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118 handles[nhandles++].handle = handle;
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119 p = (dl_funcptr) dlsym(handle, funcname);
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120 return p;
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121 }