I need help diagnosing this segfault. Because I have failed.
It is clockwork reproducible.
Does anyone else (in unix / linux) have the same segfault after
opening the streams tree in the music browser?
I think something is compiling / linking / loading wrong. I notice
that when I touch Http.cpp, that the Http.o and freeamp executable and
plugins/musicbrowser.ui and plugins/freeamp.ui are re-compiled.
When I add output to this function:
int Http::WriteToBuffer(unsigned char *buffer, unsigned int size)
{
cerr "WriteToBuffer " size endl flush;
if (m_buffer == NULL)
{
_you_are_here;
m_bufferSize = kBufferSize;
m_buffer = new unsigned char[m_bufferSize];
}
_show_args1(m_buffer);
...
...
return size;
}
That it does NOT output any message. This function is called from
this sequence in Download (line numbers for me in left column):
483: _show_args1(wcount);
484: _show_args3(m_bufferSize,m_bytesInBuffer,m_buffer);
485: wcount = this-Http::WriteToBuffer((unsigned char *)cp,
486: total - (cp-buffer));
487: _show_args1(wcount);
488: _show_args3(m_bufferSize,m_bytesInBuffer,m_buffer);
This does produce output:
@ lib/http/src/Http.cpp : 483 : enum Error Http::Download(const class string , bool)
args: wcount=0
@ lib/http/src/Http.cpp : 484 : enum Error Http::Download(const class string , bool)
args: m_bufferSize=0, m_bytesInBuffer=0, m_buffer=(null)
@ lib/http/src/Http.cpp : 487 : enum Error Http::Download(const class string , bool)
args: wcount=1804
@ lib/http/src/Http.cpp : 488 : enum Error Http::Download(const class string , bool)
args: m_bufferSize=1804, m_bytesInBuffer=0, m_buffer=
[2]+ Segmentation fault /opt/freeamp-mine/bin/freeamp
So even though the WriteToBuffer does not seems to execute the output
to cerr, it does change m_buffer and return size to wcount. I cannot
trace this in gdb, I set a breakpoint on Http::Download but it passed
right over it.
I am guessing my dificulty may lie in the way plugins are loaded and
symbols are resolved? Is gdb setting a breakpoint in freeamp's version
of Http.o and not seeing the one in musicbrowser.ui?
I still do not understand how musicbrowser.ui writes to cerr in
Download but not in WriteToBuffer.
I am out of ideas.
I am attaching the header file that defines the macros I am using,
for completeness, and my copy of Http.cpp.
I am running RH 6.2/HelixGnome with gcc 2.91.66
The make output from touching Http.cpp is
[1525|ckuklewicz /usr/local/src/freeamp/freeamp-mine]$ make
for p in base base/beos base/beos/src base/src base/unix base/unix/src dlm dlm/rmp io
io/alsa io/alsa/unix io/alsa/unix/linux io/alsa/unix/linux/src io/esound io/esound/src
io/http io/local io/obs io/src io/soundcard io/soundcard/beos io/soundcard/unix
io/soundcard/beos io/soundcard/unix/linux io/soundcard/unix/linux/src
io/soundcard/beos/src io/soundcard/unix/linux/src io/wavout io/wavout/src
io/wavout/include io/signature lib lib/xml lib/xml/src lib/http lib/http/src lib/zlib
lmc lmc/xingmp3 lmc/xingmp3/src lib/gdbm lib/zlib/src lmc/vorbis plm plm/metadata
plm/playlist plm/portable plm/portable/pmp300 lmc/xingmp3/src plm/metadata/id3v1
plm/metadata/id3v2 plm/metadata/misc plm/playlist/m3u plm/portable/pmp300/sba ui
ui/download ui/download/unix ui/freeamp ui/freeamp/beos ui/cmdline
ui/download/unix/src ui/freeamp/beos/src ui/freeamp/tools ui/freeamp/unix ui/irman
ui/lcd ui/musicbrowser ui/freeamp/src ui/freeamp/tools/src ui/freeamp/unix/src
ui/musicbrowser/src ui/musicbrowser/unix ui/mpg123 plm/playlist/pls ui/irman/src
ui/lcd/src ui/musicbrowser/unix/src ui/ncurses update update/unix lmc/cd lmc/cd/src
io/cd io/cd/unix io/cd/unix/src lib/unzip lib/unzip/src ftc ftc/kjofol ftc/winamp
plm/metadata/cddb base/aps lmc/vorbis/src io/signature/src lib/musicbrainz
lib/musicbrainz/expat lib/musicbrainz/expat/xmlparse lib/musicbrainz/expat/xmltok
lib/musicbrainz/osdep lib/musicbrainz/lib; do \
test -d $p || mkdir $p; \
done
c++ -I. -I. -I./config -DUNIX_LIBDIR=\"/opt/freeamp-mine//lib\" -Dlinux -I.
-I./lib/gdbm -I./base/include -I./config -I./io/include -I./ui/include -I./lmc/include
-I./base/unix/include -I./base/unix/linux/include -I./io/esound/include
-I./ui/musicbrowser/unix/include -I./ui/freeamp/include -I./ui/freeamp/unix/include
-I./ui/download/unix/include -I./ui/musicbrowser/include -I./ftc/kjofol
-I./io/soundcard/unix/linux/include -I./lmc/xingmp3/include -I./lmc/cd/include
-I./plm/portable/pmp300/sba -I./lib/xml/include -I./lib/zlib/include
-I./lib/unzip/include -I./io/cd/unix/include -I./base/aps -I./io/wavout/include
-I./ui/lcd/include -I./ui/irman/include -I./lib/http/include -I./io/signature/include
-I./lib/musicbrainz/lib -I./lib/musicbrainz/expat/xmltok
-I./lib/musicbrainz/expat/xmlparse -I./lmc/vorbis/include -Wall -g -O0
-I/usr/lib/glib/include -I/usr/X11R6/include -I/usr/lib/glib/include
-I/usr/X11R6/include -D_REENTRANT
