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

[Joel Cunningham]

Follow-up Comment #4, bug #44805 (project lwip):

I did find some documentation in the function pbuf_alloc().  It mentions the
pbuf should be copied with pbuf_take() if it's being queued.


I did not ifdef msghdr because open group specification lists sys/socket.h as
where struct msghdr is defined.  struct iovec is defined in sys/uio.h.  I
included a define for struct iovec for systems that don't have a sys/uio.h. 
If there are systems that define struct msghdr in other headers, maybe an
ifdef would be appropriate.

http://pubs.opengroup.org/onlinepubs/009695399/basedefs/sys/uio.h.html
http://pubs.opengroup.org/onlinepubs/007908799/xns/syssocket.h.html

I can rebase the patchsets and add handling for LWIP_NETIF_TX_SINGLE_PBUF. 
One final question I have is should we guard the sendmsg() implementation with
an LWIP_SENDMSG flag to allow reduced code size for systems that don't need
it?  I don't have a good picture on what features are considered optional vs
not.




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