/Python/dynload_shlib.c
http://unladen-swallow.googlecode.com/ · C · 143 lines · 117 code · 19 blank · 7 comment · 22 complexity · a0eb85cfbc7cfe88ce6025646105045b MD5 · raw file
- /* Support for dynamic loading of extension modules */
- #include "Python.h"
- #include "importdl.h"
- #include <sys/types.h>
- #include <sys/stat.h>
- #if defined(__NetBSD__)
- #include <sys/param.h>
- #if (NetBSD < 199712)
- #include <nlist.h>
- #include <link.h>
- #define dlerror() "error in dynamic linking"
- #endif
- #endif /* NetBSD */
- #ifdef HAVE_DLFCN_H
- #include <dlfcn.h>
- #else
- #if defined(PYOS_OS2) && defined(PYCC_GCC)
- #include "dlfcn.h"
- #endif
- #endif
- #if (defined(__OpenBSD__) || defined(__NetBSD__)) && !defined(__ELF__)
- #define LEAD_UNDERSCORE "_"
- #else
- #define LEAD_UNDERSCORE ""
- #endif
- const struct filedescr _PyImport_DynLoadFiletab[] = {
- #ifdef __CYGWIN__
- {".dll", "rb", C_EXTENSION},
- {"module.dll", "rb", C_EXTENSION},
- #else
- #if defined(PYOS_OS2) && defined(PYCC_GCC)
- {".pyd", "rb", C_EXTENSION},
- {".dll", "rb", C_EXTENSION},
- #else
- #ifdef __VMS
- {".exe", "rb", C_EXTENSION},
- {".EXE", "rb", C_EXTENSION},
- {"module.exe", "rb", C_EXTENSION},
- {"MODULE.EXE", "rb", C_EXTENSION},
- #else
- {".so", "rb", C_EXTENSION},
- {"module.so", "rb", C_EXTENSION},
- #endif
- #endif
- #endif
- {0, 0}
- };
- static struct {
- dev_t dev;
- #ifdef __VMS
- ino_t ino[3];
- #else
- ino_t ino;
- #endif
- void *handle;
- } handles[128];
- static int nhandles = 0;
- dl_funcptr _PyImport_GetDynLoadFunc(const char *fqname, const char *shortname,
- const char *pathname, FILE *fp)
- {
- dl_funcptr p;
- void *handle;
- char funcname[258];
- char pathbuf[260];
- int dlopenflags=0;
- if (strchr(pathname, '/') == NULL) {
- /* Prefix bare filename with "./" */
- PyOS_snprintf(pathbuf, sizeof(pathbuf), "./%-.255s", pathname);
- pathname = pathbuf;
- }
- PyOS_snprintf(funcname, sizeof(funcname),
- LEAD_UNDERSCORE "init%.200s", shortname);
- if (fp != NULL) {
- int i;
- struct stat statb;
- fstat(fileno(fp), &statb);
- for (i = 0; i < nhandles; i++) {
- if (statb.st_dev == handles[i].dev &&
- statb.st_ino == handles[i].ino) {
- p = (dl_funcptr) dlsym(handles[i].handle,
- funcname);
- return p;
- }
- }
- if (nhandles < 128) {
- handles[nhandles].dev = statb.st_dev;
- #ifdef __VMS
- handles[nhandles].ino[0] = statb.st_ino[0];
- handles[nhandles].ino[1] = statb.st_ino[1];
- handles[nhandles].ino[2] = statb.st_ino[2];
- #else
- handles[nhandles].ino = statb.st_ino;
- #endif
- }
- }
- #if !(defined(PYOS_OS2) && defined(PYCC_GCC))
- dlopenflags = PyThreadState_GET()->interp->dlopenflags;
- #endif
- if (Py_VerboseFlag)
- PySys_WriteStderr("dlopen(\"%s\", %x);\n", pathname,
- dlopenflags);
- #ifdef __VMS
- /* VMS currently don't allow a pathname, use a logical name instead */
- /* Concatenate 'python_module_' and shortname */
- /* so "import vms.bar" will use the logical python_module_bar */
- /* As C module use only one name space this is probably not a */
- /* important limitation */
- PyOS_snprintf(pathbuf, sizeof(pathbuf), "python_module_%-.200s",
- shortname);
- pathname = pathbuf;
- #endif
- handle = dlopen(pathname, dlopenflags);
- if (handle == NULL) {
- const char *error = dlerror();
- if (error == NULL)
- error = "unknown dlopen() error";
- PyErr_SetString(PyExc_ImportError, error);
- return NULL;
- }
- if (fp != NULL && nhandles < 128)
- handles[nhandles++].handle = handle;
- p = (dl_funcptr) dlsym(handle, funcname);
- return p;
- }