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

From: Joel Cunningham
Subject: [lwip-devel] [bug #44805] sendmsg implementation to support scatter/gather IO
Date: Tue, 28 Apr 2015 13:46:43 +0000
User-agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:37.0) Gecko/20100101 Firefox/37.0

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.


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


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