[lwip-devel] [bug #52937] raw_input() must tell ip4/6_input() whether this protocol has been received

[Joel Cunningham]

Follow-up Comment #8, bug #52937 (project lwip):

The issue that hanhui pointed out is that there are three states that can
happen in the raw_input, but the return value only communicates the first two
possibilities:

1. No matching pcb.
1. Matching pcb zero-copy 'eats' the pbuf, no further processing can happen on
it.
2. Matching pcb copies the pbuf, further processing can be done on it.

The netconn layer (recv_raw) always copies the pbuf, so eaten would never be
1.  From what hanhui described, it sounds like Linux doesn't have the
zero-copy 'eaten' case.

I'm wondering if instead this additional state should be communicated from the
raw_input return value, i.e. return 0 for no matching pcb, return 1 for eaten,
return 2 for copied/delivered.



    _______________________________________________________

Reply to this item at:

  <http://savannah.nongnu.org/bugs/?52937>

_______________________________________________
  Message sent via/by Savannah
  http://savannah.nongnu.org/