[issue2470] Need fixer for dl (removed) -> ctypes module

[Irit Katriel]

Change by Irit Katriel :


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resolution: duplicate -> wont fix

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[issue2470] Need fixer for dl (removed) -> ctypes module

[Irit Katriel]

Change by Irit Katriel :


--
resolution:  -> duplicate
stage: needs patch -> resolved
status: open -> closed
superseder:  -> Close 2to3 issues and list them here

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[issue2470] Need fixer for dl (removed) - ctypes module

[Martin v . Löwis]

Martin v. Löwis mar...@v.loewis.de added the comment:

Being open for four years, this is hardly critical.

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priority: critical - normal

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[issue2470] Need fixer for dl (removed) - ctypes module

[Florent Xicluna]

Florent Xicluna florent.xicl...@gmail.com added the comment:

for the RTLD_ constants, refer to issue #13226.

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nosy: +flox

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[issue2470] Need fixer for dl (removed) - ctypes module

[Meador Inge]

Changes by Meador Inge mead...@gmail.com:


--
stage:  - needs patch
type:  - feature request

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[issue2470] Need fixer for dl (removed) - ctypes module

[Thomas Heller]

Thomas Heller [EMAIL PROTECTED] added the comment:

I can review and try out the fixer if someone provides a patch.  OTOH I
have never used the dl module.

Note that dl exposed a lot of RTLD_ constants that ctypes does not yet,
so there should be a patch for ctypes also.

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[issue2470] Need fixer for dl (removed) - ctypes module

[Nick Edds]

Nick Edds [EMAIL PROTECTED] added the comment:

If nobody else is interested in or currently in the process of making a
fixer for this, I can do it. I'm not sure if I completely understand the
changes I need to make though. Importing dl needs to be replaced by
importing ctypes, calls to dl.open() need to be replaced by calls to
ctypes.CDLL(), and calls to call() from an open dl object need to be
replaced to calls to funcname, where funcname is the first argument to
call(). Also, any strings in the other arguments should be preceded with
b to make them byte objects. Is this all that needs doing or am I
missing something else? Are there more complicated cases that I should
also take into account?

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[issue2470] Need fixer for dl (removed) - ctypes module

[Collin Winter]

Collin Winter [EMAIL PROTECTED] added the comment:

I'd prefer it if someone better-versed in ctypes/dl wrote this fixer (or
at the very least, someone with access to Windows to test the translation).

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[issue2470] Need fixer for dl (removed) - ctypes module

[Benjamin Peterson]

Benjamin Peterson [EMAIL PROTECTED] added the comment:

What's the status of this?

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nosy: +benjamin.peterson

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[issue2470] Need fixer for dl (removed) - ctypes module

[Thomas Heller]

Thomas Heller [EMAIL PROTECTED] added the comment:

 In the simplest case, convert
 
 import dl
 libc = dl.open(libc.so.6)
 iconv = libc.call(iconv_open, ISO-8859-1, ISO-8859-2)
 print(iconv)
 
 to
 
 import ctypes
 libc = ctypes.CDLL(libc.so.6)
 iconv = libc.iconv_open(ISO-8859-1, ISO-8859-2)
 print(iconv)
 
 Notice that dlobject.call has up to 11 arguments, the first one being
 the function name.
 
 Thomas, is it the case that all calls to dl.call can be converted to a
 ctypes call without parameter conversion? dl supports these parameter
 types:
 - byte string, passed as char*
 - integers, passed as int
 - None, passed as NULL

Yes, this is correct.

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[issue2470] Need fixer for dl (removed) - ctypes module

[Thomas Heller]

Thomas Heller [EMAIL PROTECTED] added the comment:

Thomas Heller schrieb:
 Thomas Heller [EMAIL PROTECTED] added the comment:
 
 In the simplest case, convert
 
 import dl
 libc = dl.open(libc.so.6)
 iconv = libc.call(iconv_open, ISO-8859-1, ISO-8859-2)
 print(iconv)
 
 to
 
 import ctypes
 libc = ctypes.CDLL(libc.so.6)
 iconv = libc.iconv_open(ISO-8859-1, ISO-8859-2)
 print(iconv)
 

Currently, in py3k, ctypes only passed bytes objects as char*; so
the strings should be translated to bytes literals:

import ctypes
libc = ctypes.CDLL(libc.so.6)
iconv = libc.iconv_open(bISO-8859-1, bISO-8859-2)
#   ^  ^
print(iconv)

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[issue2470] Need fixer for dl (removed) - ctypes module

[Neal Norwitz]

New submission from Neal Norwitz [EMAIL PROTECTED]:

r61837 removed the dl module.  It needs a 2to3 fixer written to use ctypes.

--
assignee: collinwinter
components: 2to3 (2.x to 3.0 conversion tool)
messages: 64394
nosy: collinwinter, nnorwitz
priority: critical
severity: normal
status: open
title: Need fixer for dl (removed) - ctypes module

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[issue2470] Need fixer for dl (removed) - ctypes module

[Martin v. Löwis]

Martin v. Löwis [EMAIL PROTECTED] added the comment:

Is it possible to write one? I'm skeptical.

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nosy: +loewis

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[issue2470] Need fixer for dl (removed) - ctypes module

[Collin Winter]

Collin Winter [EMAIL PROTECTED] added the comment:

Can you list the mapping you'd like to see? I've never used dl or
ctypes, so I'm not immediately sure how to port from one to the other.

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[issue2470] Need fixer for dl (removed) - ctypes module

[Martin v. Löwis]

Martin v. Löwis [EMAIL PROTECTED] added the comment:

In the simplest case, convert

import dl
libc = dl.open(libc.so.6)
iconv = libc.call(iconv_open, ISO-8859-1, ISO-8859-2)
print(iconv)

to

import ctypes
libc = ctypes.CDLL(libc.so.6)
iconv = libc.iconv_open(ISO-8859-1, ISO-8859-2)
print(iconv)

Notice that dlobject.call has up to 11 arguments, the first one being
the function name.

Thomas, is it the case that all calls to dl.call can be converted to a
ctypes call without parameter conversion? dl supports these parameter
types:
- byte string, passed as char*
- integers, passed as int
- None, passed as NULL

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