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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;
}
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