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List:       kde-devel
Subject:    How do I attach gdb to a process using threaded Qt?
From:       Michael =?iso-8859-1?q?H=E4ckel?= <Michael () Haeckel ! Net>
Date:       2001-09-15 13:21:07
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Hi,

Can someone tell me, how I now can debug a kio slave, that is compiled with 
threaded Qt3 ?

If I attach gdb, I get as usual, besides an error message:

[...]
Reading symbols from /lib/libc.so.6...done.
Loaded symbols for /lib/libc.so.6
Reading symbols from /lib/libpthread.so.0...done.
[New Thread 1024 (LWP 642)]
Error while reading shared library symbols:
attach_thread: No such process.
Reading symbols from /usr/X11R6/lib/libGL.so.1...done.
Loaded symbols for /usr/X11R6/lib/libGL.so.1
[...]

However continuing the process dosn't work as usual:

(gdb) continue
Continuing.
ptrace: No such process.
0x4125595e in __select () from /lib/libc.so.6

Even switching to the thread dosn't help:

(gdb) info threads
  1 Thread 1024 (LWP 642)  warning: Couldn't get registers.
warning: Couldn't get floating point status.
warning: Couldn't get registers.
warning: Couldn't get floating point status.
0x4125595e in __select () from /lib/libc.so.6
(gdb) thread 1
warning: Couldn't get registers.
warning: Couldn't get floating point status.
warning: Couldn't get registers.
warning: Couldn't get floating point status.
[Switching to thread 1 (Thread 1024 (LWP 642))]
#0  0x4125595e in __select () from /lib/libc.so.6
(gdb) continue
Continuing.
ptrace: No such process.
[Switching to Thread 1024 (LWP 642)]
0x4125595e in __select () from /lib/libc.so.6

Not even detaching again works.

Any ideas?

Regards,
Michael Häckel
 
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