Re: gdk_input_add ?

[Havoc Pennington <hp redhat com>]

Ken Steen <ksteen earthlink net> writes:
> I have a program that starts a server then forks off the client program.
> Everything works fine except once the client program is executed my main
> Gtk+ program freezes until it finishes the read from the client program.
> I obviously am missing something.  The start server function is called
> from the main Gtk+ program by the user.  I thought the gdk_input_add
> function would only call the read_from_client function when there is
> data ready to be read which in this case is only just before the client
> program exits.  Does anyone have any ideas on what I am missing?

read_from_client() will be called anytime there's data on the file
descriptor, so as soon as your client provides some data.
 
> void
> read_from_client(gpointer data, gint from, GdkInputCondition
> condition)
> {
>       int i;
>       gchar buf[1024];
>       struct sockaddr_un addr;
>       int sin_size, new_fd;
>
>       memset(&addr, '\0', sizeof(addr));
>       sin_size = sizeof(addr);
>
>       new_fd = accept(from, (struct sockaddr *) &addr, 
>                          &sin_size); 
>
>       i = read(new_fd, buf, sizeof(buf));

I think read_from_client() is called as soon as the socket has
incoming connections; you then accept() to get a handle to read data
from, but this new_fd doesn't necessarily have data available yet.
So you need to have two input functions, one accept_client() installed
on the socket and the other read_from_client() that you attach to
new_fd after you accept().

>       if(i >=1)
>       {
>               if(!strcmp(buf, "SESSION OVER\n"))
>               {

buf isn't nul-terminated, unless the other end of the socket sent you
a nul byte.

Havoc