From e21720da69f2a505bcd1405cc7e8b52d5649df55 Mon Sep 17 00:00:00 2001
From: Thijs Schreijer <thijs@thijsschreijer.nl>
Date: Sat, 29 Aug 2026 19:59:33 +0200
Subject: fix(receive): a receive 0 should immediately return, not block

The fix is slightly more complex because reading from a closed
socket should still return a closed-error.

fixes: #427
fixes: https://github.com/ledgetech/lua-resty-http/pull/313
---
 src/wsocket.c | 1 +
 1 file changed, 1 insertion(+)

(limited to 'src/wsocket.c')

diff --git a/src/wsocket.c b/src/wsocket.c
index d3af9d4..86c6994 100644
--- a/src/wsocket.c
+++ b/src/wsocket.c
@@ -247,6 +247,7 @@ int socket_recv(p_socket ps, char *data, size_t count, size_t *got,
     int err, prev = IO_DONE;
     *got = 0;
     if (*ps == SOCKET_INVALID) return IO_CLOSED;
+    if (count == 0) return IO_DONE;
     for ( ;; ) {
         int taken = recv(*ps, data, (int) count, 0);
         if (taken > 0) {
-- 
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