46 lines
1.8 KiB
Plaintext
Executable File
46 lines
1.8 KiB
Plaintext
Executable File
To debug fakeroot, one may try:
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Start faked in xterm 1:
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$ faked --foreground --debug
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51452231:280
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# First number here is the 'FAKEROOTKEY', second is the pid of
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# faked. Both to be used later.
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# Later, when programs go using faked, a _lot_ of debug output
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# will be shown here.
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Send signals to faked in xterm 2:
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#Whenever you want to get info about the internal inode data
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#faked is keeping, do:
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kill -s USR1 280
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And the 'real' program runs (at your choise) in another xterm [3], or gdb
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In an xterm, do:
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$ LD_PRELOAD=/usr/lib/libfakeroot/libfakeroot.so.0
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$ FAKEROOTKEY=51452231 # number output by faked, xterm 1
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$ export LD_PRELOAD FAKEROOTKEY
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$ my-prog #start anything you like.
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Or, if you want to run the programme in a gdb session:
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To make specifying the paths easier, put libfakeroot.c, libfakeroot.so.0.0.1
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and the binary you want to run in the same directory (libfakeroot.so.0.0.1
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is put in ./.libs/libfakeroot.so.0.0.1 by libtool during compilation, copy
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it out there).
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Then, in gdb do:
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$ gdb ./ls #as an example, I run 'ls'.
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(gdb) set env LD_PRELOAD=/home/joost/maintain/vpathlib/libfakeroot-0.1/libfakeroot.so.0.0.1
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(gdb) set env FAKEROOTKEY=51452231 #number from xterm 1.
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# Or wherever you've got your libfakeroot.so.0.0.1
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(gdb) break libfakeroot.c:181
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Breakpoint 1 at 0x4000ecc8: file libfakeroot.c, line 181.
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(gdb) run -al
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Starting program: /home/joost/maintain/vpathlib/libfakeroot-0.1/ls -al
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Temporarily disabling shared library breakpoints:
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1
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Breakpoint 1, __lxstat (ver=134556187, file_name=0x0, statbuf=0x80529c8)
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at libfakeroot.c:208
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208 struct stat *statbuf){
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# OK, and there I've found a bug -- ver can only be '0' in the
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# current libc6 (glibc2). Unfortunately, it didn't reproduce.
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