Re: Starting DDD programmatically

[Michael Eager]

On 08/26/2011 09:14 AM, address@hidden wrote:
> I'm writing CGI scripts using the C language. I'd like to know if DDD can help 
> me debug these
> programs (scripts).
>
> CGI scripts are programs that get executed by a web server (ex: Apache). 
> Scripts don't run
> continuously. They are executed by the web server when the user of a web browser 
> "submits" a web
> page that contains an HTML form. The script (C program) runs long enough to 
> process the information
> on the form. The script then terminates. Consequently, there is no continously 
> running program for
> DDD to attach to. Is there a way that the script (or the web server) can start 
> or attach to DDD when
> the script executes?

You might add code to your script to save the PID for the
CGI process and then sleep for a while to allow you to attach
with gdb/ddd.  Something like the following:

void wait_for_gdb (void)
{
  pid_t pid = getpid();
  FILE pidfd = fopen ("/tmp/cgipid", "w")
  fprintf (pidfd, "%d", pid);
  fclose (pidfd);

  sleep (15);
}

or perhaps wait for you to set a flag before continuing:

  while (fopen ("/tmp/goddd", "r") != 0) sleep (1);


--
Michael Eager    address@hidden
1960 Park Blvd., Palo Alto, CA 94306  650-325-8077