Re: [Valgrind-users] db attach to processes vs thread

[Andy H. <And...@au...>]

Julian Seward wrote:
>> 	When I specify --db-attach with helgrind, the debugger is attached to the
>> thread in question, not the its parent process. Is there a way to make it
>> attach to the process instead?
> 
> Not sure I quite understand.  When you say "parent process", do you mean
> "the root thread of the process" ?
> 
> J
> 

Julian,

	Yes, exactly. In the debugger I only see one thread, so I can't inspect my other threads 
to see what is going on. I made a script to query /proc and figure out the parent and 
launch gdb:

#!/bin/sh

file=$1;
pid=$2;

if [ -f /proc/${pid}/status ]; then
  ppid=`grep 'PPid:' /proc/${pid}/status|sed -e 's/PPid:[^0-9]*//'`
  echo "pid $pid ppid $ppid file $file"
  /usr/bin/gdb $file $ppid
else
  echo "can't find tgid for $pid"
  exit 1;
fi

I pass this to valgrind as:

--db-command=/home/andy/script/vg_gdb %f %p

I see all the threads, but gdb can't find the symbol tables. I have worked out how to find 
them.

Thanks,

	Andy