attach gdbserver to itself

[Bin Chen <binary dot chen at gmail dot com>]

Hi,

Current I am doing a trick that attach the gdbserver to itself when the 
process encounter the segment fault, like this:

void segv_handler(int no)
{
   int pid, status;

   VoIPLog("segv_handler.");
   char buf[128];

   pid = getpid();

   sprintf(buf, "/usr/bin/gdbserver :9988 --attach %d", pid);

   pid = fork();
   if (pid == 0) {
       system(buf);
   } else
       ::wait((int *)&status);

   return;
}

But in most of time this can't get useful information, especially in 
multi threading env, most of time the result is wrong, of course, I am 
saying the backtrace.

But if I start program by gdbserver :9988 program, it can catch the 
error. What is the difference? How can I revise my code to make above 
code has same effect like starting the program by gdbserver?

I am debugging in ARM platform.

Any help appreciated!

Bin Chen