From 224119a60ab81cec41e21d35b91d3d54f4136747 Mon Sep 17 00:00:00 2001
From: Alin Gherman <slaninacuceapa@gmail.com>
Date: Mon, 30 Sep 2019 11:48:02 +0200
Subject: [PATCH] Retry in case of too many sockets opened instead of stopping
 the server.

---
 httplib.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/httplib.h b/httplib.h
index b3441e7..e640670 100644
--- a/httplib.h
+++ b/httplib.h
@@ -98,6 +98,7 @@ typedef int socket_t;
 #include <assert.h>
 #include <atomic>
 #include <condition_variable>
+#include <errno.h>
 #include <fcntl.h>
 #include <fstream>
 #include <functional>
@@ -2550,6 +2551,12 @@ inline bool Server::listen_internal() {
       socket_t sock = accept(svr_sock_, nullptr, nullptr);
 
       if (sock == INVALID_SOCKET) {
+        if (errno == EMFILE) {
+          // The per-process limit of open file descriptors has been reached.
+          // Try to accept new connections after a short sleep.
+          std::this_thread::sleep_for(std::chrono::milliseconds(1));
+          continue;
+        }
         if (svr_sock_ != INVALID_SOCKET) {
           detail::close_socket(svr_sock_);
           ret = false;