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[[meta copyright="Copyright © 2007 Free Software Foundation, Inc."]]
[[meta license="Permission is granted to copy, distribute and/or modify this
document under the terms of the GNU Free Documentation License, Version 1.2 or
any later version published by the Free Software Foundation; with no Invariant
Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license
is included in the section entitled
[[GNU_Free_Documentation_License|/fdl.txt]]."]]
Say you want to try running file system server (*[[translator/ext2fs]]*<!--`[[translator/ext2fs]]`-->,
*[[translator/jfs]]*<!--`[[translator/jfs]]`-->, ...) against a modified version of *[[libpager]]*<!--`[[libpager]]`--> and
debug the latter one using [[GDB]].
Set the [[translator]] like this:
$ settrans -fgap ↩
jfs.img.i ↩
/usr/bin/env ↩
LD_LIBRARY_PATH=~tschwinge/tmp/hurd/hurd.ogi/build/libpager ↩
"`pwd`"/jfs.obj/jfs ↩
"`pwd`"/jfs.img
Then, when starting GDB, start it like this (or use an equivalent method, of
course):
$ LD_LIBRARY_PATH=~tschwinge/tmp/hurd/hurd.ogi/build/libpager ↩
gdb ↩
~tschwinge/tmp/jfs/jfs.obj/jfs 15436
GNU gdb 6.5-debian
[...]
Reading symbols from /lib/libdiskfs.so.0.3...Reading symbols from /lib/debug/lib/libdiskfs.so.0.3...done.
done.
Loaded symbols for /lib/libdiskfs.so.0.3
Reading symbols from /devel4/tschwinge/tmp/hurd/hurd.ogi/build/libpager/libpager.so.0.3...done.
Loaded symbols for /devel4/tschwinge/tmp/hurd/hurd.ogi/build/libpager/libpager.so.0.3
Reading symbols from /lib/libstore.so.0.3...Reading symbols from /lib/debug/lib/libstore.so.0.3...done.
done.
Loaded symbols for /lib/libstore.so.0.3
[...]
(gdb) break pager_demuxer
Breakpoint 1 at 0x105c98d: file ../../libpager/demuxer.c, line 27.
[...]
Breakpoint 1, pager_demuxer (inp=0x12bded0, outp=0x12bbec0) at ../../libpager/demuxer.c:27
27 {
(gdb) list
22 /* Demultiplex a single message directed at a pager port; INP is the
23 message received; fill OUTP with the reply. */
24 int
25 pager_demuxer (mach_msg_header_t *inp,
[...]
Voilà.
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