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net: EAGAIN handling for net/socket.c UDP

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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: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
This commit is contained in:
Stefan Hajnoczi 2012-08-20 10:28:53 +01:00 committed by Stefan Hajnoczi
parent 863f678fba
commit 213fd5087e
1 changed files with 12 additions and 2 deletions
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14
net/socket.c
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@ -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)