Add FreeBSD support.

GitOrigin-RevId: 8cc4a42d4c7879ba1b19591f7b37880d5d554585

README.md

@@ -19,7 +19,7 @@ TDLib (Telegram Database library) is a cross-platform library for building [Tele
 
 `TDLib` has many advantages. Notably `TDLib` is:
 
-* **Cross-platform**: `TDLib` can be used on Android, iOS, Windows, macOS, Linux, Windows Phone, WebAssembly, watchOS, tvOS, Tizen, Cygwin. It should also work on other *nix systems with or without minimal effort.
+* **Cross-platform**: `TDLib` can be used on Android, iOS, Windows, macOS, Linux, FreeBSD, Windows Phone, WebAssembly, watchOS, tvOS, Tizen, Cygwin. It should also work on other *nix systems with or without minimal effort.
 * **Multilanguage**: `TDLib` can be easily used with any programming language that is able to execute C functions. Additionally it already has native Java (using `JNI`) bindings and .NET (using `C++/CLI` and `C++/CX`) bindings.
 * **Easy to use**: `TDLib` takes care of all network implementation details, encryption and local data storage.
 * **High-performance**: in the [Telegram Bot API](https://core.telegram.org/bots/api), each `TDLib` instance handles more than 23000 active bots simultaneously.

tdutils/td/utils/port/config.h

@@ -19,6 +19,9 @@
 #if TD_LINUX || TD_ANDROID || TD_TIZEN
   #define TD_POLL_EPOLL 1
   #define TD_EVENTFD_LINUX 1
+#elif TD_FREEBSD
+  #define TD_POLL_KQUEUE 1
+  #define TD_EVENTFD_BSD 1
 #elif TD_CYGWIN
   #define TD_POLL_SELECT 1
   #define TD_EVENTFD_BSD 1

tdutils/td/utils/port/detail/KQueue.h

@@ -18,6 +18,8 @@
 
 #include <cstdint>
 
+#include <sys/types.h> // must be included before sys/event.h, which depends on sys/types.h on FreeBSD
+
 #include <sys/event.h>
 
 namespace td {

tdutils/td/utils/port/platform.h

@@ -43,6 +43,8 @@
   #define TD_TIZEN 1
 #elif defined(__linux__)
   #define TD_LINUX 1
+#elif defined(__FreeBSD__)
+  #define TD_FREEBSD 1
 #elif defined(__CYGWIN__)
   #define TD_CYGWIN 1
 #elif defined(__EMSCRIPTEN__)