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Re: Error reporting should be improved
From: |
Bob Friesenhahn |
Subject: |
Re: Error reporting should be improved |
Date: |
Tue, 29 Dec 2009 18:49:22 -0600 (CST) |
User-agent: |
Alpine 2.01 (GSO 1266 2009-07-14) |
I instrumented vm_sym (and friends) like this:
static void *
vm_sym (lt_user_data LT__UNUSED loader_data, lt_module module, const
char *name)
{
void *address = dlsym (module, name);
if (!address)
{
DL__SETERROR (SYMBOL_NOT_FOUND);
fprintf(stderr,"dlsym: %s\n",lt__get_last_error());
}
return address;
}
and tested with GraphicsMagick. The output on "success" looks like:
dlsym: ld.so.1: gm: fatal: tiff_LTX_RegisterTIFFImage: can't find symbol
dlsym: ld.so.1: gm: fatal: tiff_LTX_UnregisterTIFFImage: can't find symbol
dlsym: ld.so.1: gm: fatal: logo_LTX_RegisterLOGOImage: can't find symbol
dlsym: ld.so.1: gm: fatal: logo_LTX_UnregisterLOGOImage: can't find symbol
dlsym: ld.so.1: gm: fatal: gif_LTX_RegisterGIFImage: can't find symbol
dlsym: ld.so.1: gm: fatal: gif_LTX_UnregisterGIFImage: can't find symbol
and on failure (by moving libjpeg, which libtiff depends on to cause
an error while loading the tiff module) it looks like:
dlopen: ld.so.1: gm: fatal: libjpeg.so.7: open failed: No such file or directory
dlopen: ld.so.1: gm: fatal:
/home/bfriesen/build/GraphicsMagick-16-modules/coders/tiff.so: open failed: No
such file or directory
dlopen: ld.so.1: gm: fatal: libjpeg.so.7: open failed: No such file or directory
dlopen: ld.so.1: gm: fatal:
/home/bfriesen/build/GraphicsMagick-16-modules/coders/tiff.so: open failed: No
such file or directory
dlsym: ld.so.1: gm: fatal: logo_LTX_RegisterLOGOImage: can't find symbol
dlsym: ld.so.1: gm: fatal: logo_LTX_UnregisterLOGOImage: can't find symbol
dlsym: ld.so.1: gm: fatal: gif_LTX_RegisterGIFImage: can't find symbol
dlsym: ld.so.1: gm: fatal: gif_LTX_UnregisterGIFImage: can't find symbol
/home/bfriesen/build/GraphicsMagick-16-modules/utilities/.libs/gm convert: Unable to load
module ("/home/bfriesen/build/GraphicsMagick-16-modules/coders/tiff.la: file not
found") [No such file or directory].
The approach of passing preloader symbols to all of the loaders seems
oddly familiar.
Bob
--
Bob Friesenhahn
address@hidden, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer, http://www.GraphicsMagick.org/
- Error reporting should be improved, Xiaoqiang Zhou, 2009/12/27
- Re: Error reporting should be improved, Peter Rosin, 2009/12/29
- Re: Error reporting should be improved, Bob Friesenhahn, 2009/12/29
- Re: Error reporting should be improved, Peter Rosin, 2009/12/29
- Re: Error reporting should be improved, Bob Friesenhahn, 2009/12/29
- Re: Error reporting should be improved, Peter Rosin, 2009/12/29
- Re: Error reporting should be improved, Bob Friesenhahn, 2009/12/29
- Re: Error reporting should be improved, Bob Friesenhahn, 2009/12/29
- Re: Error reporting should be improved, Peter Rosin, 2009/12/29
- Re: Error reporting should be improved, Bob Friesenhahn, 2009/12/29
- Re: Error reporting should be improved,
Bob Friesenhahn <=
- Re: Error reporting should be improved, Peter Rosin, 2009/12/30
- Re: Error reporting should be improved, Bob Friesenhahn, 2009/12/30
- Re: Error reporting should be improved, Peter Rosin, 2009/12/30
- Re: Error reporting should be improved, Bob Friesenhahn, 2009/12/30
- Re: Error reporting should be improved, Peter Rosin, 2009/12/30