Debugging programs with multiple processes
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   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 
See Attach).  From that point on you can debug the child process just
like any other process which you attached to.