UNIX for Advanced & Expert Users

Hi,

I want to debug a child process which is forked from other process.
Whenever I try to attach the pid of child process to gbd, the
process gets killed and the parent process starts a new child process.

any idea what could be the reason.
In general how can i debug a child process with gdb.

thanks in advance.

-Ashish

Basically you have to pause the child, get it's pid, then have gdb attach to it.

See:
http://www.cs.ust.hk/~keithlau/Pilot...16/gdb_26.html

thanks for your help.

I tried to place sleep in child process. But the child process exec another
process. I tried to keep sleep at the start od execed program too, but it get defuncted immediately after I attach the pid to gdb.
Any pointers in this direction,

thanks in advance,

Try creating a signal handler in the "second" child. Have it wait forever for a user defined signal like SIGUSR1 for example.

The idea is to prevent the process from doing anything until you have attached to it.

Jim,
thanks for ur help.

I am able to attach the pid of child process to gdb (by putting sleep in main) . But it(child) gets defuncted in a while and my parent process starts a new child process.
Parent process uses a hell lot of threads and might be that is causing the problem.
Jim, I wish u would sit beside me and tell these fundas in depth :-).

Any pointers in this direction would help.

Thanks in advance.
-Ashish