Re: fork()

[Russell Shaw <rjshaw at netspace dot net dot au>]

Ramana Radhakrishnan wrote:
> Russell Shaw wrote:
>
> > Siddharth Choudhary Kode wrote:
> >
> > > Check the info doc, sec. 4.10.  This is only supported on GNU/Linux 
> > > 2.5.60+ and HP-UX 11.x+.  If your platform doesn't support it, the 
> > > best option is to insert a sleep() statement at the beginning of your 
> > > child code and then have a new gdb session attach to the child 
> > > process before the sleep expires.
> >
> >
> >
> > Hi,
> > I'm using 2.6.10 on debian sid.
> >
> > > On Thu, 31 Mar 2005, Russell Shaw wrote:
> > >
> > > > Hi,
> > > >
> > > > I was debugging a program with gdb-6.3 and did: set follow-fork-mode 
> > > > child but fork() still returns the PID meaning that it is still following 
> > > > the parent.
>
> Can you show the context in which you are getting this ?

I was debugging ttink (a utility for monitoring epson printers). It doesn't matter
much now because i found a different utilty.

I compiled it from source with gcc-3.4.4, using CFLAGS= -g -O0.

cmd.c:


/* no server, create the shared memory   */
   /* and the sub process for port /dev/... */
   if ( pid == -1 && ! connectedOnServer )
   {
      *shmem->function    = '\0';
      shmem->printerState = 4;
      shmem->mode         = mode;
      shmem->command      = command;
      shmem->pass         = pass;
      shmem->choice       = choice;
      *shmem->buf         = '\0';
      shmem->ready        = 0;

      switch((pid=fork()))               <<<-------------------- here
      {
         case 0:
            doCommands(NULL);
            break;
         case -1:
         break;
         default:
            /* allow to react on child dead */
            signal(SIGCHLD, sigChild);
      }
#endif
   }