Commit 213fd508 authored by Stefan Hajnoczi's avatar Stefan Hajnoczi Committed by Stefan Hajnoczi
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net: EAGAIN handling for net/socket.c UDP 



Implement asynchronous send for UDP (or other SOCK_DGRAM) sockets.  If
send fails with EAGAIN we wait for the socket to become writable again.

Signed-off-by: default avatarStefan Hajnoczi <stefanha@linux.vnet.ibm.com>
parent 863f678f

net/socket.c

+12 −2
Original line number Diff line number Diff line
@@ -102,9 +102,19 @@ static ssize_t net_socket_receive(NetClientState *nc, const uint8_t *buf, size_t 
static ssize_t net_socket_receive_dgram(NetClientState *nc, const uint8_t *buf, size_t size)

{

    NetSocketState *s = DO_UPCAST(NetSocketState, nc, nc);

    ssize_t ret;



    return sendto(s->fd, (const void *)buf, size, 0,

                  (struct sockaddr *)&s->dgram_dst, sizeof(s->dgram_dst));

    do {

        ret = sendto(s->fd, buf, size, 0,

                     (struct sockaddr *)&s->dgram_dst,

                     sizeof(s->dgram_dst));

    } while (ret == -1 && errno == EINTR);



    if (ret == -1 && errno == EAGAIN) {

        net_socket_write_poll(s, true);

        return 0;

    }

    return ret;

}



static void net_socket_send(void *opaque)