libkqueue

A user space implementation of the kqueue(2) kernel event notification mechanism libkqueue acts as a translator between the kevent structure and the native kernel facilities on Linux, Android, Solaris, and Windows.

libkqueue is not perfect, and you may need to change the behaviour of your application to work around limitations on a given platform. Please see BUGS for known behavioural differences between libkqueue and BSD kqueues.

Supported Event Types

vnode
socket
proc
user
timer

Installation - Linux, Solaris

cmake -G "Unix Makefiles" -DCMAKE_INSTALL_PREFIX=/usr -DCMAKE_INSTALL_LIBDIR=lib <path to source>
make
make install

Installation - Red Hat

cmake3 -G "Unix Makefiles" -DCMAKE_INSTALL_PREFIX=/usr -DCMAKE_INSTALL_LIBDIR=lib <path to source>
make
cpack3 -G RPM

Installation - Debian

cmake -G "Unix Makefiles" -DCMAKE_INSTALL_PREFIX=/usr -DCMAKE_INSTALL_LIBDIR=lib <path to source>
make
cpack -G DEB

Installation - Android

cmake -G "Unix Makefiles" -DCMAKE_C_COMPILER=<path to NDK compiler> -DCMAKE_INSTALL_PREFIX=/usr -DCMAKE_INSTALL_LIBDIR=lib <path to source>
make

Windows (Visual Studio Project)

cmake -G "Visual Studio 14 2015" <path to source>
cmake --build .

Windows (clang/C2) (Visual Studio Project)

cmake -G "Visual Studio 14 2015" -T "LLVM-vs2014" <path to source>
cmake --build .

Windows (cross-compiling on Ubuntu using MinGW)

sudo apt-get install mingw-w64
rm -rf CMakeCache.txt CMakeFiles
mkdir build
cd build
cmake -DCMAKE_TOOLCHAIN_FILE=Toolchain-mingw32.cmake ..
make

Xcode (project)

cmake -G "Xcode" <path to source>

Running Unit Tests

cmake -G "Unix Makefiles" -DCMAKE_INSTALL_PREFIX=/usr -DCMAKE_INSTALL_LIBDIR=lib -DENABLE_TESTING=YES -DCMAKE_BUILD_TYPE=Debug <path to source>
make
make test

Build & Running only the test suite

Helpful to see the behavior of the tests on systems with native kqueue, e.g: macOS, FreeBSD

cmake . test/CMakeLists.txt
make -C test/
./test/libkqueue-test

To enable tests which expose bugs in native kqueue implementations pass -DWITH_NATIVE_KQUEUE_BUGS=1 to cmake. i.e. cmake . test/CMakeLists.txt -DWITH_NATIVE_KQUEUE_BUGS=1.

Debugging

For best results add -DCMAKE_BUILD_TYPE=Debug to your cmake invocation, this will disable optimisation and add debugging symbols to ensure your debugger produces usable output, it also enables asserts.

The environmental variable KQUEUE_DEBUG can then be set to enable debug output from libkqueue and the test utility.

KQUEUE_DEBUG=1 <your application>

When building under clang and some later versions of GCC, you can add the following flags:

-DENABLE_ASAN=YES, enables address sansitizer (detects use after free issues, and out of bounds accesses).
-DENABLE_LSAN=YES, enables leak sanitizer (detects memory leaks).
-DENABLE_TSAN=YES, enables thread sanitizer (detects races).
-DENABLE_UBSAN=YES, enables undefined behaviour sanitizer (detects misaligned accesses, interger wrap, divide by zero etc...).

Building Applications

CFLAGS += -I/usr/include/kqueue
LDFLAGS += -lkqueue

Tutorials & Examples

Kqueues for Fun and Profit

Handling TCP Connections with Kqueue Event Notification

Releases History

2.0 add support for Android 2013-04-29

1.0 stable relesae for Linux, Solaris, and Windows 2010-09-18

gerickson / libkqueue