[lwip-devel] [bug #31084] socket API returns always EMSGSIZE on non-blocking sockets if data size > send buffers

[SandrineLWI1565]

Follow-up Comment #6, bug #31084 (project lwip):

Hello All,

I use lwip-1.4.0. I need using non-blocking socket. So I have applied patch
done at 2011-07-22 20:05:24 on the Git master branch. I have only done changes
described in this commit on the 1.4.0 release version.

I call lwip_send(1, data=0x2000c030, size=2050, flags=0x0) on a socket alreay
in non blocking mode (no need using MSG_DONTWAIT flag).

Unfortunally, it fails with logs

lwip_send(1, data=0x2000c030, size=2050, flags=0x0)
tcp_write(pcb=0x20001810, data=0x2000c030, len=1072, apiflags=1)
tcp_write: queuelen: 0
tcp_write: queueing 6511:7047
tcp_write: queueing 7047:7583
tcp_write: 2 (after enqueued)
tcp_output_segment: 6511:7047
lwip_send(1) err=0 written=1072
lwip_send(1, data=0x2000c460, size=978, flags=0x0)
do_writemore: No more tcp_sndbuf available
lwip_send(1) err=-7 written=0

where "do_writemore: No more tcp_sndbuf available" is a log in code 

do_writemore(struct netconn *conn)
{
....
 available = tcp_sndbuf(conn->pcb.tcp);
  if (available < len) {
    /* don't try to write more than sendbuf */
    len = available;
    if (dontblock){
        if (!len) {
            LWIP_DEBUGF(SOCKETS_DEBUG, ("do_writemore: No more tcp_sndbuf
availablen"));
            err = ERR_WOULDBLOCK;
            goto err_mem;
            }
    } else {
.......


Do you think the patch is correct on 1.4.0 version or do I need the GIT master
version? Do I have a problem with my buffers's size in opt.h?

Best Regards

Sandrine

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