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Receive of zero for UDP is now possible.

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Previously, receive of zero was considered to be "closed", but that
is only true for stream-based protocols, like TCP.
This commit is contained in:
Sam Roberts
2011-08-08 16:11:47 -07:00
parent c37f71d062
commit 21698c7665
1 changed files with 6 additions and 0 deletions
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6
src/udp.c
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@@ -170,6 +170,9 @@ static int meth_receive(lua_State *L) {
count = MIN(count, sizeof(buffer));
timeout_markstart(tm);
err = socket_recv(&udp->sock, buffer, count, &got, tm);
/* Unlike TCP, recv() of zero is not closed, but a zero-length packet. */
if (err == IO_CLOSED)
err = IO_DONE;
if (err != IO_DONE) {
lua_pushnil(L);
lua_pushstring(L, udp_strerror(err));
@@ -194,6 +197,9 @@ static int meth_receivefrom(lua_State *L) {
count = MIN(count, sizeof(buffer));
err = socket_recvfrom(&udp->sock, buffer, count, &got,
(SA *) &addr, &addr_len, tm);
/* Unlike TCP, recv() of zero is not closed, but a zero-length packet. */
if (err == IO_CLOSED)
err = IO_DONE;
if (err == IO_DONE) {
lua_pushlstring(L, buffer, got);
lua_pushstring(L, inet_ntoa(addr.sin_addr));