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Debugging programs with multiple processes
GDB has no special support for debugging programs which create
additional processes using the fork function. When a program forks,
GDB will continue to debug the parent process and the child process
will run unimpeded. If you have set a breakpoint in any code which
the child then executes, the child will get a SIGTRAP signal which
(unless it catches the signal) will cause it to terminate.

However, if you want to debug the child process there is a
workaround which isn't too painful. Put a call to sleep in the code
which the child process executes after the fork. It may be useful to
sleep only if a certain environment variable is set, or a certain
file exists, so that the delay need not occur when you don't want to
run GDB on the child. While the child is sleeping, use the ps
program to get its process ID. Then tell GDB (a new invocation of
GDB if you are also debugging the parent process) to attach to the
child process (see section Debugging an already-running process).
From that point on you can debug the child process just like any
other process which you attached to.