| 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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| 18 |
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| 19 | #ifdef HAVE_DLFCN_H
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| 20 | #include <dlfcn.h>
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| 21 | #else
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| 22 | #if defined(PYOS_OS2) && defined(PYCC_GCC)
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| 23 | #ifdef __KLIBC__
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| 24 | #error "kLIBC has dlfcn.h and shouldn't get here!"
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| 25 | #endif
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| 26 | #include "dlfcn.h"
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| 27 | #endif
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| 28 | #endif
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| 29 |
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| 30 | #if ((defined(__OpenBSD__) || defined(__NetBSD__)) && !defined(__ELF__)) \
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| 31 | || (defined(__OS2__) && defined(__KLIBC__))
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| 32 | #define LEAD_UNDERSCORE "_"
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| 33 | #else
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| 34 | #define LEAD_UNDERSCORE ""
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| 35 | #endif
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| 36 |
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| 37 |
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| 38 | const struct filedescr _PyImport_DynLoadFiletab[] = {
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| 39 | #ifdef __CYGWIN__
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| 40 | {".dll", "rb", C_EXTENSION},
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| 41 | {"module.dll", "rb", C_EXTENSION},
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| 42 | #else
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| 43 | #if (defined(PYOS_OS2) && defined(PYCC_GCC)) || (defined(__OS2__) && defined(__KLIBC__))
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| 44 | {".pyd", "rb", C_EXTENSION},
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| 45 | {".dll", "rb", C_EXTENSION},
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| 46 | #else
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| 47 | #ifdef __VMS
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| 48 | {".exe", "rb", C_EXTENSION},
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| 49 | {".EXE", "rb", C_EXTENSION},
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| 50 | {"module.exe", "rb", C_EXTENSION},
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| 51 | {"MODULE.EXE", "rb", C_EXTENSION},
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| 52 | #else
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| 53 | {".so", "rb", C_EXTENSION},
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| 54 | {"module.so", "rb", C_EXTENSION},
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| 55 | #endif
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| 56 | #endif
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| 57 | #endif
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| 58 | {0, 0}
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| 59 | };
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| 60 |
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| 61 | static struct {
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| 62 | dev_t dev;
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| 63 | #ifdef __VMS
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| 64 | ino_t ino[3];
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| 65 | #else
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| 66 | ino_t ino;
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| 67 | #endif
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| 68 | void *handle;
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| 69 | } handles[128];
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| 70 | static int nhandles = 0;
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| 71 |
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| 72 |
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| 73 | dl_funcptr _PyImport_GetDynLoadFunc(const char *fqname, const char *shortname,
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| 74 | const char *pathname, FILE *fp)
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| 75 | {
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| 76 | dl_funcptr p;
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| 77 | void *handle;
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| 78 | char funcname[258];
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| 79 | char pathbuf[260];
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| 80 | int dlopenflags=0;
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| 81 |
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| 82 | if (strchr(pathname, '/') == NULL) {
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| 83 | /* Prefix bare filename with "./" */
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| 84 | PyOS_snprintf(pathbuf, sizeof(pathbuf), "./%-.255s", pathname);
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| 85 | pathname = pathbuf;
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| 86 | }
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| 87 |
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| 88 | PyOS_snprintf(funcname, sizeof(funcname),
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| 89 | LEAD_UNDERSCORE "init%.200s", shortname);
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| 90 |
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| 91 | if (fp != NULL) {
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| 92 | int i;
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| 93 | struct stat statb;
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| 94 | fstat(fileno(fp), &statb);
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| 95 | for (i = 0; i < nhandles; i++) {
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| 96 | if (statb.st_dev == handles[i].dev &&
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| 97 | statb.st_ino == handles[i].ino) {
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| 98 | p = (dl_funcptr) dlsym(handles[i].handle,
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| 99 | funcname);
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| 100 | return p;
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| 101 | }
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| 102 | }
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| 103 | if (nhandles < 128) {
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| 104 | handles[nhandles].dev = statb.st_dev;
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| 105 | #ifdef __VMS
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| 106 | handles[nhandles].ino[0] = statb.st_ino[0];
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| 107 | handles[nhandles].ino[1] = statb.st_ino[1];
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| 108 | handles[nhandles].ino[2] = statb.st_ino[2];
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| 109 | #else
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| 110 | handles[nhandles].ino = statb.st_ino;
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| 111 | #endif
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| 112 | }
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| 113 | }
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| 114 |
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| 115 | #if !(defined(PYOS_OS2) && defined(PYCC_GCC))
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| 116 | dlopenflags = PyThreadState_GET()->interp->dlopenflags;
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| 117 | #endif
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| 118 |
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| 119 | if (Py_VerboseFlag)
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| 120 | PySys_WriteStderr("dlopen(\"%s\", %x);\n", pathname,
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| 121 | dlopenflags);
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| 122 |
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| 123 | #ifdef __VMS
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| 124 | /* VMS currently don't allow a pathname, use a logical name instead */
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| 125 | /* Concatenate 'python_module_' and shortname */
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| 126 | /* so "import vms.bar" will use the logical python_module_bar */
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| 127 | /* As C module use only one name space this is probably not a */
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| 128 | /* important limitation */
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| 129 | PyOS_snprintf(pathbuf, sizeof(pathbuf), "python_module_%-.200s",
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| 130 | shortname);
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| 131 | pathname = pathbuf;
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| 132 | #endif
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| 133 |
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| 134 | #if (defined(PYOS_OS2) && defined(PYCC_GCC))
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| 135 | // resolve unixroot
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| 136 | if (_realrealpath( pathname, pathbuf, sizeof(pathbuf))!=0)
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| 137 | pathname = pathbuf;
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| 138 | #endif
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| 139 |
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| 140 | handle = dlopen(pathname, dlopenflags);
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| 141 |
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| 142 | if (handle == NULL) {
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| 143 | const char *error = dlerror();
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| 144 | if (error == NULL)
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| 145 | error = "unknown dlopen() error";
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| 146 | PyErr_SetString(PyExc_ImportError, error);
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| 147 | return NULL;
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| 148 | }
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| 149 | if (fp != NULL && nhandles < 128)
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| 150 | handles[nhandles++].handle = handle;
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| 151 | p = (dl_funcptr) dlsym(handle, funcname);
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| 152 | return p;
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| 153 | }
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