[Tipxd-devel] Last Major Data Structure information

[Thomas H. <nor...@ya...>]

Last night I added the last of the major DS's to include/main.h in the
repository.  This data structure, selectinfo_t, will be used to list the
currently open file descriptors for processing with the select() syscall.  It
is my intent to have a single linked-list of these, one for each file
descriptor, and each one having pointers to the appropriate operations for
reading, writing, and processing errors on it.  Then the structure of main will
look similar to this:

 --- [SNIP] --- [SNIP] ---
for( ; ; )
   selectinfo_t *info;
   FD_SET read_fds, err_fds;

   for(info = selectinfo; info != NULL; info = info->next )
   {
      FD_ADD( &read_fds, info->fd );
      FD_ADD( &err_fds, info->fd );
   }

   retval = select( &read_fds, NULL, &err_fds, &timeout );

   for(info = selectinfo; info != NULL; info = info->next )
   {
      if(FD_ISSET( &read_fds, info->fd ) )
         retval = info->read_op( info );
      if(FD_ISSET( &err_fds, info->fd ) )
         retval = info->err_op( info );
   }
}

 --- [SNIP] --- [SNIP] ---

This is a little more than psuedo-code, but I'm not really compiling the code
above.  Hopefully from this, though, you get the general idea we're going for. 
The trick is coding the read, write, and error operations for the socket types
that we are going to have:

UDP Data
TCP Data
TCP Control
UDP Control
TCP Admin
UDP Admin

More on this when I get back to coding.  Probably going to be Wednesday night
for at least a little while.
	--tom

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