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/* 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;

}