From ad9b4588f26d500b9fbdeaff3d66ec7dfd6d9c9d Mon Sep 17 00:00:00 2001
From: Ben Clayton <bclayton@google.com>
Date: Tue, 26 May 2020 10:28:51 +0100
Subject: [PATCH] Fix `dap::Socket::read()` when `recv()` errors

Identified by @kuafuwang.

Fixes #29
---
 src/socket.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/socket.cpp b/src/socket.cpp
index f78f17a..506d7ae 100644
--- a/src/socket.cpp
+++ b/src/socket.cpp
@@ -158,7 +158,9 @@ class dap::Socket::Shared : public dap::ReaderWriter {
     if (s == InvalidSocket) {
       return 0;
     }
-    return recv(s, reinterpret_cast<char*>(buffer), static_cast<int>(bytes), 0);
+    auto len =
+        recv(s, reinterpret_cast<char*>(buffer), static_cast<int>(bytes), 0);
+    return (len < 0) ? 0 : len;
   }
 
   bool write(const void* buffer, size_t bytes) {