From e0e7ebcf295cd1c80d1d9a1189a15b0770c879a4 Mon Sep 17 00:00:00 2001
From: Florian Albrechtskirchinger <falbrechtskirchinger@gmail.com>
Date: Mon, 17 Feb 2025 08:51:28 +0100
Subject: [PATCH] Make poll() the default

select() can still be enabled by defining CPPHTTPLIB_USE_SELECT.
---
 Dockerfile | 2 +-
 README.md  | 6 +++---
 httplib.h  | 6 ++++++
 3 files changed, 10 insertions(+), 4 deletions(-)

diff --git a/Dockerfile b/Dockerfile
index 654845b..4abae17 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -2,7 +2,7 @@ FROM yhirose4dockerhub/ubuntu-builder AS builder
 WORKDIR /build
 COPY httplib.h .
 COPY docker/main.cc .
-RUN g++ -std=c++23 -static -o server -O2 -I. -DCPPHTTPLIB_USE_POLL main.cc && strip server
+RUN g++ -std=c++23 -static -o server -O2 -I. main.cc && strip server
 
 FROM scratch
 COPY --from=builder /build/server /server
diff --git a/README.md b/README.md
index fc4b537..2a6cbfa 100644
--- a/README.md
+++ b/README.md
@@ -872,10 +872,10 @@ res->body; // Compressed data
 
 ```
 
-Use `poll` instead of `select`
-------------------------------
+Use `select()` instead of `poll()`
+----------------------------------
 
-`select` system call is used as default since it's more widely supported. If you want to let cpp-httplib use `poll` instead, you can do so with `CPPHTTPLIB_USE_POLL`.
+cpp-httplib defaults to the widely supported `poll()` system call. If your OS lacks support for `poll()`, define `CPPHTTPLIB_USE_SELECT` to use `select()` instead.
 
 Unix Domain Socket Support
 --------------------------
diff --git a/httplib.h b/httplib.h
index edea018..b95b8c2 100644
--- a/httplib.h
+++ b/httplib.h
@@ -145,6 +145,12 @@
 #define CPPHTTPLIB_LISTEN_BACKLOG 5
 #endif
 
+#if !defined(CPPHTTPLIB_USE_POLL) && !defined(CPPHTTPLIB_USE_SELECT)
+#define CPPHTTPLIB_USE_POLL
+#elif defined(CPPHTTPLIB_USE_POLL) && defined(CPPHTTPLIB_USE_SELECT)
+#error "CPPHTTPLIB_USE_POLL and CPPHTTPLIB_USE_SELECT are mutually exclusive"
+#endif
+
 /*
  * Headers
  */