newbie question: debug a multiple processes server program

[PoWah Wong]

I want to debug a server program testd which calls fork() to create multiple processes.
testd is created as follow:
g++ -g -o linux/util.o src/util.c
...
ar -r linux/libUtilLib2.a linux/util.o ...
g++ -lpthread -ldl -g -o linux/testd  linux/libUtilLib2.a ...

testd is started as follows:
# linux/testd
# ps -ef|grep test
root     31629     1  1 16:51 ?        00:00:00 linux/testd
root     31630 31629  0 16:51 ?        00:00:00 linux/testd
root     31631 31630  0 16:51 ?        00:00:00 linux/testd
root     31632 31630  0 16:51 ?        00:00:00 linux/testd
root     31633 31630  0 16:51 ?        00:00:00 linux/testd
root     31634 31630  0 16:51 ?        00:00:00 linux/testd
root     31635 31630  0 16:51 ?        00:00:00 linux/testd
root     31636 31630  0 16:51 ?        00:00:00 linux/testd
root     31637 31630  0 16:51 ?        00:00:00 linux/testd
root     31638 31630  0 16:51 ?        00:00:00 linux/testd
root     31639 31630  0 16:51 ?        00:00:00 linux/testd
root     31640 31630  0 16:51 ?        00:00:00 linux/testd

The program testd has a bug in the foo() of the util.c in the src directory.
What is the best way to setup gdb to debug this program?

This is what I am think, please comment:
- cd src
- Start testd by ../linux/testd
- Start gdb
- Load debugging info
  symbol-file ../linux/testd
- Attach to the parent process (i.e. pid 31629)
- set breakpoint in the foo() of the util.c
  b foo
- Resume testd execution
  run
- Execute the client program
- Wait for breakpoint to occur



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