[lwip-devel] [bug #44805] sendmsg implementation to support scatter/gather IO

[Joel Cunningham]

Follow-up Comment #2, bug #44805 (project lwip):

Simon,

Thanks for looking at the patch.  I based the UDP support on how sendto() is
implemented.

For configurations where LWIP_NETIF_TX_SINGLE_PBUF is not enabled, sendto()
skips the memory copy and uses a reference.  Specifically, it declares a
struct netbuf on the stack called "buf" and then adds the data via reference
with netbuf_ref().  Then it calls netbuf_send(), afterwards returning control
to application.

Is the sendto implementation also incorrect, or did I overlook something?

Or is the issue that my patch doesn't work when LWIP_NETIF_TX_SINGLE_PBUF is
enabled? I can add support for it and when enabled, flatten the vectors into a
contiguous pbuf.

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