Make poll() the default

select() can still be enabled by defining CPPHTTPLIB_USE_SELECT.

Author: falbrechtskirchinger

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

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
 --------------------------

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
  */