From a2374b78f298d5755e96468bb97e4d7b660ff9d6 Mon Sep 17 00:00:00 2001 From: Stefan Hajnoczi Date: Mon, 20 Aug 2012 10:28:53 +0100 Subject: [PATCH] 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: Stefan Hajnoczi (cherry picked from commit 213fd5087e2e4e2da10ad266df0ba950cf7618bf) Signed-off-by: Michael Roth --- net/socket.c | 14 ++++++++++++-- 1 file changed, 12 insertions(+), 2 deletions(-) diff --git a/net/socket.c b/net/socket.c index 54e32f0..e5e4e8d 100644 --- a/net/socket.c +++ b/net/socket.c @@ -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) -- 1.8.0.2