Fix a bug when EAGAIN on reading sockets (#182)

* Fix a bug when EAGAIN on reading sockets

* remove ubuntu16.04 from CI

Author: an-tao

.github/workflows/cmake.yml

@@ -62,10 +62,10 @@ jobs:
             buildname: 'ubuntu-20.04/gcc'
             triplet: x64-linux
             compiler: gcc_64
-          - os: ubuntu-16.04
-            buildname: 'ubuntu-16.04/gcc'
-            triplet: x64-linux
-            compiler: gcc_64
+          # - os: ubuntu-16.04
+          #   buildname: 'ubuntu-16.04/gcc'
+          #   triplet: x64-linux
+          #   compiler: gcc_64
           - os: macos-latest
             buildname: 'macos/clang'
             triplet: x64-osx

trantor/net/inner/TcpConnectionImpl.cc

@@ -552,9 +552,11 @@ void TcpConnectionImpl::readCallback()
         }
         else if (n < 0)
         {
-            if (errno == EPIPE || errno == ECONNRESET)  // TODO: any others?
+            if (errno == EPIPE || errno == ECONNRESET ||
+                errno == EAGAIN)  // TODO: any others?
             {
-                LOG_DEBUG << "EPIPE or ECONNRESET, errno=" << errno;
+                LOG_DEBUG << "EPIPE or ECONNRESET, errno=" << errno
+                          << " fd=" << socketPtr_->fd();
                 return;
             }
 #ifdef _WIN32