mirror of
https://github.com/python/cpython
synced 2024-09-05 00:05:39 +00:00
Remove the dl module per PEP 3108.
This commit is contained in:
Neal Norwitz
parent
e7789b186d
commit
6cf49cf106
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@ -1,108 +0,0 @@
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:mod:`dl` --- Call C functions in shared objects
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================================================
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.. module:: dl
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:platform: Unix
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:synopsis: Call C functions in shared objects.
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.. sectionauthor:: Moshe Zadka <moshez@zadka.site.co.il>
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The :mod:`dl` module defines an interface to the :cfunc:`dlopen` function, which
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is the most common interface on Unix platforms for handling dynamically linked
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libraries. It allows the program to call arbitrary functions in such a library.
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.. warning::
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The :mod:`dl` module bypasses the Python type system and error handling. If
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used incorrectly it may cause segmentation faults, crashes or other incorrect
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behaviour.
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.. note::
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This module will not work unless ``sizeof(int) == sizeof(long) == sizeof(char
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*)`` If this is not the case, :exc:`SystemError` will be raised on import.
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The :mod:`dl` module defines the following function:
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.. function:: open(name[, mode=RTLD_LAZY])
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Open a shared object file, and return a handle. Mode signifies late binding
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(:const:`RTLD_LAZY`) or immediate binding (:const:`RTLD_NOW`). Default is
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:const:`RTLD_LAZY`. Note that some systems do not support :const:`RTLD_NOW`.
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Return value is a :class:`dlobject`.
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The :mod:`dl` module defines the following constants:
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.. data:: RTLD_LAZY
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Useful as an argument to :func:`open`.
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.. data:: RTLD_NOW
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Useful as an argument to :func:`open`. Note that on systems which do not
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support immediate binding, this constant will not appear in the module. For
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maximum portability, use :func:`hasattr` to determine if the system supports
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immediate binding.
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The :mod:`dl` module defines the following exception:
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.. exception:: error
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Exception raised when an error has occurred inside the dynamic loading and
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linking routines.
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Example::
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>>> import dl, time
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>>> a=dl.open('/lib/libc.so.6')
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>>> a.call('time'), time.time()
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(929723914, 929723914.498)
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This example was tried on a Debian GNU/Linux system, and is a good example of
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the fact that using this module is usually a bad alternative.
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.. _dl-objects:
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Dl Objects
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----------
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Dl objects, as returned by :func:`open` above, have the following methods:
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.. method:: dl.close()
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Free all resources, except the memory.
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.. method:: dl.sym(name)
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Return the pointer for the function named *name*, as a number, if it exists in
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the referenced shared object, otherwise ``None``. This is useful in code like::
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>>> if a.sym('time'):
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... a.call('time')
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... else:
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... time.time()
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(Note that this function will return a non-zero number, as zero is the *NULL*
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pointer)
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.. method:: dl.call(name[, arg1[, arg2...]])
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Call the function named *name* in the referenced shared object. The arguments
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must be either Python integers, which will be passed as is, Python strings, to
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which a pointer will be passed, or ``None``, which will be passed as *NULL*.
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Note that strings should only be passed to functions as :ctype:`const char\*`,
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as Python will not like its string mutated.
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There must be at most 10 arguments, and arguments not given will be treated as
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``None``. The function's return value must be a C :ctype:`long`, which is a
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Python integer.
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@ -304,7 +304,7 @@ always available.
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.. function:: getdlopenflags()
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Return the current value of the flags that are used for :cfunc:`dlopen` calls.
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The flag constants are defined in the :mod:`dl` and :mod:`DLFCN` modules.
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The flag constants are defined in the :mod:`ctypes` and :mod:`DLFCN` modules.
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Availability: Unix.
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@ -587,8 +587,8 @@ always available.
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the interpreter loads extension modules. Among other things, this will enable a
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lazy resolving of symbols when importing a module, if called as
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``sys.setdlopenflags(0)``. To share symbols across extension modules, call as
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``sys.setdlopenflags(dl.RTLD_NOW | dl.RTLD_GLOBAL)``. Symbolic names for the
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flag modules can be either found in the :mod:`dl` module, or in the :mod:`DLFCN`
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``sys.setdlopenflags(ctypes.RTLD_GLOBAL)``. Symbolic names for the
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flag modules can be either found in the :mod:`ctypes` module, or in the :mod:`DLFCN`
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module. If :mod:`DLFCN` is not available, it can be generated from
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:file:`/usr/include/dlfcn.h` using the :program:`h2py` script. Availability:
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Unix.
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@ -17,7 +17,6 @@ of it. Here's an overview:
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spwd.rst
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grp.rst
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crypt.rst
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dl.rst
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termios.rst
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tty.rst
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pty.rst
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@ -1,34 +0,0 @@
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#! /usr/bin/env python
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"""Test dlmodule.c
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Roger E. Masse revised strategy by Barry Warsaw
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"""
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import dl
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from test.test_support import verbose,TestSkipped
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sharedlibs = [
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('/usr/lib/libc.so', 'getpid'),
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('/lib/libc.so.6', 'getpid'),
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('/usr/bin/cygwin1.dll', 'getpid'),
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('/usr/lib/libc.dylib', 'getpid'),
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]
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for s, func in sharedlibs:
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try:
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if verbose:
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print('trying to open:', s, end=' ')
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l = dl.open(s)
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except dl.error as err:
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if verbose:
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print('failed', repr(str(err)))
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pass
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else:
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if verbose:
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print('succeeded...', end=' ')
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l.call(func)
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l.close()
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if verbose:
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print('worked!')
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break
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else:
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raise TestSkipped('Could not open any shared libraries')
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@ -18,6 +18,8 @@ Core and Builtins
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Extension Modules
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-----------------
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- The dl module was removed, use the ctypes module instead.
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- Use wchar_t functions in _locale module.
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Library
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@ -295,14 +295,6 @@ _symtable symtablemodule.c
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#_curses_panel _curses_panel.c -lpanel -lncurses
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# Generic (SunOS / SVR4) dynamic loading module.
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# This is not needed for dynamic loading of Python modules --
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# it is a highly experimental and dangerous device for calling
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# *arbitrary* C functions in *arbitrary* shared libraries:
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#dl dlmodule.c
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# Modules that provide persistent dictionary-like semantics. You will
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# probably want to arrange for at least one of them to be available on
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# your machine, though none are defined by default because of library
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@ -1,279 +0,0 @@
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/* dl module */
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#include "Python.h"
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#include <dlfcn.h>
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#ifdef __VMS
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#include <unistd.h>
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#endif
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#ifndef RTLD_LAZY
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#define RTLD_LAZY 1
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#endif
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typedef void *PyUnivPtr;
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typedef struct {
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PyObject_HEAD
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PyUnivPtr *dl_handle;
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} dlobject;
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static PyTypeObject Dltype;
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static PyObject *Dlerror;
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static PyObject *
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newdlobject(PyUnivPtr *handle)
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{
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dlobject *xp;
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xp = PyObject_New(dlobject, &Dltype);
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if (xp == NULL)
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return NULL;
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xp->dl_handle = handle;
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return (PyObject *)xp;
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}
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static void
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dl_dealloc(dlobject *xp)
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{
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if (xp->dl_handle != NULL)
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dlclose(xp->dl_handle);
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PyObject_Del(xp);
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}
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static PyObject *
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dl_close(dlobject *xp)
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{
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if (xp->dl_handle != NULL) {
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dlclose(xp->dl_handle);
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xp->dl_handle = NULL;
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}
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Py_INCREF(Py_None);
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return Py_None;
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}
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static PyObject *
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dl_sym(dlobject *xp, PyObject *args)
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{
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char *name;
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PyUnivPtr *func;
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if (PyUnicode_Check(args)) {
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name = PyUnicode_AsString(args);
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} else {
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PyErr_Format(PyExc_TypeError, "expected string, found %.200s",
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Py_TYPE(args)->tp_name);
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return NULL;
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}
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func = dlsym(xp->dl_handle, name);
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if (func == NULL) {
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Py_INCREF(Py_None);
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return Py_None;
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}
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return PyLong_FromLong((long)func);
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}
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static PyObject *
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dl_call(dlobject *xp, PyObject *args)
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{
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PyObject *name;
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long (*func)(long, long, long, long, long,
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long, long, long, long, long);
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long alist[10];
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long res;
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Py_ssize_t i;
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Py_ssize_t n = PyTuple_Size(args);
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if (n < 1) {
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PyErr_SetString(PyExc_TypeError, "at least a name is needed");
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return NULL;
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}
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name = PyTuple_GetItem(args, 0);
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if (!PyUnicode_Check(name)) {
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PyErr_SetString(PyExc_TypeError,
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"function name must be a string");
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return NULL;
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}
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func = (long (*)(long, long, long, long, long,
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long, long, long, long, long))
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dlsym(xp->dl_handle, PyUnicode_AsString(name));
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if (func == NULL) {
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PyErr_SetString(PyExc_ValueError, dlerror());
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return NULL;
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}
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if (n-1 > 10) {
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PyErr_SetString(PyExc_TypeError,
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"too many arguments (max 10)");
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return NULL;
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}
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for (i = 1; i < n; i++) {
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PyObject *v = PyTuple_GetItem(args, i);
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if (PyLong_Check(v)) {
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alist[i-1] = PyLong_AsLong(v);
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if (alist[i-1] == -1 && PyErr_Occurred())
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return NULL;
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} else if (PyUnicode_Check(v))
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alist[i-1] = (long)PyUnicode_AsString(v);
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else if (v == Py_None)
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alist[i-1] = (long) ((char *)NULL);
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else {
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PyErr_SetString(PyExc_TypeError,
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"arguments must be int, string or None");
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return NULL;
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}
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}
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for (; i <= 10; i++)
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alist[i-1] = 0;
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res = (*func)(alist[0], alist[1], alist[2], alist[3], alist[4],
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alist[5], alist[6], alist[7], alist[8], alist[9]);
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return PyLong_FromLong(res);
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}
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static PyMethodDef dlobject_methods[] = {
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{"call", (PyCFunction)dl_call, METH_VARARGS},
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{"sym", (PyCFunction)dl_sym, METH_O},
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{"close", (PyCFunction)dl_close, METH_NOARGS},
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{NULL, NULL} /* Sentinel */
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};
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static PyObject *
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dl_getattr(dlobject *xp, char *name)
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{
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return Py_FindMethod(dlobject_methods, (PyObject *)xp, name);
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}
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static PyTypeObject Dltype = {
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PyVarObject_HEAD_INIT(NULL, 0)
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"dl.dl", /*tp_name*/
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sizeof(dlobject), /*tp_basicsize*/
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0, /*tp_itemsize*/
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/* methods */
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(destructor)dl_dealloc, /*tp_dealloc*/
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0, /*tp_print*/
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(getattrfunc)dl_getattr,/*tp_getattr*/
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0, /*tp_setattr*/
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0, /*tp_compare*/
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0, /*tp_repr*/
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0, /*tp_as_number*/
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0, /*tp_as_sequence*/
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0, /*tp_as_mapping*/
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0, /*tp_hash*/
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};
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static PyObject *
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dl_open(PyObject *self, PyObject *args)
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{
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char *name;
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int mode;
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PyUnivPtr *handle;
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if (sizeof(int) != sizeof(long) ||
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sizeof(long) != sizeof(char *)) {
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PyErr_SetString(PyExc_SystemError,
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"module dl requires sizeof(int) == sizeof(long) == sizeof(char*)");
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return NULL;
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}
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if (PyArg_ParseTuple(args, "z:open", &name))
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mode = RTLD_LAZY;
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else {
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PyErr_Clear();
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if (!PyArg_ParseTuple(args, "zi:open", &name, &mode))
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return NULL;
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#ifndef RTLD_NOW
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if (mode != RTLD_LAZY) {
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PyErr_SetString(PyExc_ValueError, "mode must be 1");
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return NULL;
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}
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#endif
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}
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handle = dlopen(name, mode);
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if (handle == NULL) {
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PyErr_SetString(Dlerror, dlerror());
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return NULL;
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}
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#ifdef __VMS
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/* Under OpenVMS dlopen doesn't do any check, just save the name
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* for later use, so we have to check if the file is readable,
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* the name can be a logical or a file from SYS$SHARE.
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*/
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if (access(name, R_OK)) {
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char fname[strlen(name) + 20];
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strcpy(fname, "SYS$SHARE:");
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strcat(fname, name);
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strcat(fname, ".EXE");
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if (access(fname, R_OK)) {
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dlclose(handle);
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PyErr_SetString(Dlerror,
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"File not found or protection violation");
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return NULL;
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}
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}
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#endif
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return newdlobject(handle);
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}
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static PyMethodDef dl_methods[] = {
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{"open", dl_open, METH_VARARGS},
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{NULL, NULL} /* sentinel */
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};
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/* From socketmodule.c
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* Convenience routine to export an integer value.
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*
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* Errors are silently ignored, for better or for worse...
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*/
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static void
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insint(PyObject *d, char *name, int value)
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{
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PyObject *v = PyLong_FromLong((long) value);
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if (!v || PyDict_SetItemString(d, name, v))
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PyErr_Clear();
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Py_XDECREF(v);
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}
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PyMODINIT_FUNC
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initdl(void)
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{
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PyObject *m, *d, *x;
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/* Initialize object type */
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Py_TYPE(&Dltype) = &PyType_Type;
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/* Create the module and add the functions */
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m = Py_InitModule("dl", dl_methods);
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if (m == NULL)
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return;
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/* Add some symbolic constants to the module */
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d = PyModule_GetDict(m);
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Dlerror = x = PyErr_NewException("dl.error", NULL, NULL);
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PyDict_SetItemString(d, "error", x);
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x = PyLong_FromLong((long)RTLD_LAZY);
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PyDict_SetItemString(d, "RTLD_LAZY", x);
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#define INSINT(X) insint(d,#X,X)
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#ifdef RTLD_NOW
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INSINT(RTLD_NOW);
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#endif
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#ifdef RTLD_NOLOAD
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INSINT(RTLD_NOLOAD);
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#endif
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#ifdef RTLD_GLOBAL
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INSINT(RTLD_GLOBAL);
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#endif
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#ifdef RTLD_LOCAL
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INSINT(RTLD_LOCAL);
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#endif
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#ifdef RTLD_PARENT
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INSINT(RTLD_PARENT);
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#endif
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#ifdef RTLD_GROUP
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INSINT(RTLD_GROUP);
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#endif
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#ifdef RTLD_WORLD
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INSINT(RTLD_WORLD);
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#endif
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#ifdef RTLD_NODELETE
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INSINT(RTLD_NODELETE);
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#endif
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}
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@ -290,7 +290,6 @@ SRC.MODULES= $(addprefix $(TOP), \
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Modules/cStringIO.c \
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Modules/_csv.c \
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Modules/datetimemodule.c \
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Modules/dlmodule.c \
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Modules/errnomodule.c \
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Modules/fcntlmodule.c \
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Modules/_functoolsmodule.c \
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|
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@ -507,19 +507,6 @@ dbmmodule.obj: $(PY_INCLUDE)\abstract.h $(PY_INCLUDE)\ceval.h $(PY_INCLUDE)\clas
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$(PY_INCLUDE)\sliceobject.h $(PY_INCLUDE)\stringobject.h \
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$(PY_INCLUDE)\sysmodule.h $(PY_INCLUDE)\traceback.h $(PY_INCLUDE)\tupleobject.h
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dlmodule.obj: $(PY_INCLUDE)\abstract.h $(PY_INCLUDE)\ceval.h $(PY_INCLUDE)\classobject.h \
|
||||
$(PY_INCLUDE)\cobject.h $(PY_INCLUDE)\complexobject.h pyconfig.h \
|
||||
$(PY_INCLUDE)\dictobject.h $(PY_INCLUDE)\fileobject.h $(PY_INCLUDE)\floatobject.h \
|
||||
$(PY_INCLUDE)\funcobject.h $(PY_INCLUDE)\import.h $(PY_INCLUDE)\intobject.h \
|
||||
$(PY_INCLUDE)\intrcheck.h $(PY_INCLUDE)\listobject.h $(PY_INCLUDE)\longobject.h \
|
||||
$(PY_INCLUDE)\methodobject.h $(PY_INCLUDE)\modsupport.h \
|
||||
$(PY_INCLUDE)\moduleobject.h $(PY_INCLUDE)\mymalloc.h $(PY_INCLUDE)\myproto.h \
|
||||
$(PY_INCLUDE)\object.h $(PY_INCLUDE)\objimpl.h $(PY_INCLUDE)\pydebug.h \
|
||||
$(PY_INCLUDE)\pyerrors.h $(PY_INCLUDE)\pyfpe.h $(PY_INCLUDE)\pystate.h \
|
||||
$(PY_INCLUDE)\python.h $(PY_INCLUDE)\pythonrun.h $(PY_INCLUDE)\rangeobject.h \
|
||||
$(PY_INCLUDE)\sliceobject.h $(PY_INCLUDE)\stringobject.h \
|
||||
$(PY_INCLUDE)\sysmodule.h $(PY_INCLUDE)\traceback.h $(PY_INCLUDE)\tupleobject.h
|
||||
|
||||
errno.obj: $(PY_INCLUDE)\abstract.h $(PY_INCLUDE)\ceval.h $(PY_INCLUDE)\classobject.h \
|
||||
$(PY_INCLUDE)\cobject.h $(PY_INCLUDE)\complexobject.h pyconfig.h \
|
||||
$(PY_INCLUDE)\dictobject.h $(PY_INCLUDE)\fileobject.h $(PY_INCLUDE)\floatobject.h \
|
||||
|
|
|
|||
|
|
@ -201,7 +201,6 @@ MODULES = \
|
|||
|
||||
# zlibmodule.c -- Wrapper of ZLib Compression API (GZip Format)
|
||||
# puremodule.c -- Wrapper of Purify Debugging API (Probably Non-OS/2)
|
||||
# dlmodule.c -- Some Wierd Form of Data Processing Module
|
||||
# xxmodule.c -- Template to Create Your Own Module
|
||||
|
||||
#
|
||||
|
|
@ -419,14 +418,6 @@ dbmmodule.obj: abstract.h ceval.h classobject.h cobject.h complexobject.h \
|
|||
pythonrun.h rangeobject.h sliceobject.h stringobject.h sysmodule.h \
|
||||
traceback.h tupleobject.h
|
||||
|
||||
dlmodule.obj: abstract.h ceval.h classobject.h cobject.h complexobject.h \
|
||||
pyconfig.h dictobject.h fileobject.h floatobject.h funcobject.h \
|
||||
import.h intobject.h intrcheck.h listobject.h longobject.h \
|
||||
methodobject.h modsupport.h moduleobject.h mymalloc.h myproto.h \
|
||||
object.h objimpl.h pydebug.h pyerrors.h pyfpe.h pystate.h python.h \
|
||||
pythonrun.h rangeobject.h sliceobject.h stringobject.h sysmodule.h \
|
||||
traceback.h tupleobject.h
|
||||
|
||||
errno.obj: abstract.h ceval.h classobject.h cobject.h complexobject.h \
|
||||
pyconfig.h dictobject.h fileobject.h floatobject.h funcobject.h \
|
||||
import.h intobject.h intrcheck.h listobject.h longobject.h \
|
||||
|
|
|
|||
11
setup.py
11
setup.py
|
|
@ -1105,17 +1105,6 @@ class db_found(Exception): pass
|
|||
exts.append(Extension('_codecs_%s' % loc,
|
||||
['cjkcodecs/_codecs_%s.c' % loc]))
|
||||
|
||||
# Dynamic loading module
|
||||
if sys.maxsize == 0x7fffffff:
|
||||
# This requires sizeof(int) == sizeof(long) == sizeof(char*)
|
||||
dl_inc = find_file('dlfcn.h', [], inc_dirs)
|
||||
if (dl_inc is not None) and (platform not in ['atheos']):
|
||||
exts.append( Extension('dl', ['dlmodule.c']) )
|
||||
else:
|
||||
missing.append('dl')
|
||||
else:
|
||||
missing.append('dl')
|
||||
|
||||
# Thomas Heller's _ctypes module
|
||||
self.detect_ctypes(inc_dirs, lib_dirs)
|
||||
|
||||
|
|
|
|||
Loading…
Reference in a new issue