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annotate Python/dynload_mac.c @ 68237:364638d6434d 2.3

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Close 2.3 branch.
author Georg Brandl <georg@python.org>
date Sat, 05 Mar 2011 14:55:46 +0100
parents ed28b9752f8d
children
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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 <Aliases.h>
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8 #include <CodeFragments.h>
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9 #ifdef USE_GUSI1
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10 #include "TFileSpec.h" /* for Path2FSSpec() */
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11 #endif
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12 #include <Files.h>
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13 #include <TextUtils.h>
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14 #include "macdefs.h"
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15 #include "macglue.h"
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16
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17
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18 const struct filedescr _PyImport_DynLoadFiletab[] = {
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19 {".slb", "rb", C_EXTENSION},
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20 {".carbon.slb", "rb", C_EXTENSION},
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21 {0, 0}
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22 };
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23
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24
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25 dl_funcptr _PyImport_GetDynLoadFunc(const char *fqname, const char *shortname,
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26 const char *pathname, FILE *fp)
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27 {
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28 dl_funcptr p;
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29 char funcname[258];
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30
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31 /*
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32 ** Dynamic loading of CFM shared libraries on the Mac. The
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33 ** code has become more convoluted than it was, because we
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34 ** want to be able to put multiple modules in a single
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35 ** file. For this reason, we have to determine the fragment
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36 ** name, and we cannot use the library entry point but we have
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37 ** to locate the correct init routine "by hand".
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38 */
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39 FSSpec libspec;
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40 CFragConnectionID connID;
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41 Ptr mainAddr;
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42 Str255 errMessage;
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43 OSErr err;
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44 #ifndef USE_GUSI1
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45 Boolean isfolder, didsomething;
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46 #endif
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47 char buf[512];
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48 Str63 fragname;
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49 Ptr symAddr;
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50 CFragSymbolClass class;
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51
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52 /* First resolve any aliases to find the real file */
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53 #ifdef USE_GUSI1
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54 err = Path2FSSpec(pathname, &libspec);
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55 #else
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56 c2pstrcpy((unsigned char *)buf, pathname);
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57 (void)FSMakeFSSpec(0, 0, (unsigned char *)buf, &libspec);
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58 err = ResolveAliasFile(&libspec, 1, &isfolder, &didsomething);
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59 #endif
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60 if ( err ) {
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61 PyOS_snprintf(buf, sizeof(buf),
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62 "%.200s: %.200s", pathname, PyMac_StrError(err));
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63 PyErr_SetString(PyExc_ImportError, buf);
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64 return NULL;
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65 }
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66 /* Next, determine the fragment name,
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67 by stripping '.slb' and 'module' */
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68 memcpy(fragname+1, libspec.name+1, libspec.name[0]);
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69 fragname[0] = libspec.name[0];
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70 if( strncmp((char *)(fragname+1+fragname[0]-4),
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71 ".slb", 4) == 0 )
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72 fragname[0] -= 4;
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73 if ( strncmp((char *)(fragname+1+fragname[0]-6),
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74 "module", 6) == 0 )
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75 fragname[0] -= 6;
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76 /* Load the fragment
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77 (or return the connID if it is already loaded */
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78 err = GetDiskFragment(&libspec, 0, 0, fragname,
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79 kLoadCFrag, &connID, &mainAddr,
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80 errMessage);
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81 if ( err == cfragImportTooOldErr || err == cfragImportTooNewErr ) {
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82 /*
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83 ** Special-case code: if PythonCore is too old or too new this means
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84 ** the dynamic module was meant for a different Python.
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85 */
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86 if (errMessage[0] == 10 && strncmp((char *)errMessage+1, "PythonCore", 10) == 0 ) {
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87 PyOS_snprintf(buf, sizeof(buf),
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88 "Dynamic module was built for %s version of MacPython",
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89 (err == cfragImportTooOldErr ? "a newer" : "an older"));
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90 PyErr_SetString(PyExc_ImportError, buf);
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91 return NULL;
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92 }
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93 }
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94 if ( err ) {
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95 PyOS_snprintf(buf, sizeof(buf), "%.*s: %.200s",
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96 errMessage[0], errMessage+1,
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97 PyMac_StrError(err));
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98 PyErr_SetString(PyExc_ImportError, buf);
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99 return NULL;
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100 }
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101 /* Locate the address of the correct init function */
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102 PyOS_snprintf(funcname, sizeof(funcname), "init%.200s", shortname);
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103 err = FindSymbol(connID, Pstring(funcname), &symAddr, &class);
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104 if ( err ) {
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105 PyOS_snprintf(buf, sizeof(buf), "%s: %.200s",
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106 funcname, PyMac_StrError(err));
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107 PyErr_SetString(PyExc_ImportError, buf);
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108 return NULL;
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109 }
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110 p = (dl_funcptr)symAddr;
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111
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112 return p;
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113 }