From patchwork Mon Aug 20 13:27:00 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: [2/3] net: EAGAIN handling for net/socket.c UDP Date: Mon, 20 Aug 2012 03:27:00 -0000 From: Stefan Hajnoczi X-Patchwork-Id: 178817 Message-Id: <1345469221-15992-3-git-send-email-stefanha@linux.vnet.ibm.com> To: Cc: Stefan Hajnoczi 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 --- 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)