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small epoll implementation using kqueue; includes all features needed for libinput/libevdev

License: MIT License

C++ 1.35% C 91.91% CMake 6.74%

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epoll-shim's Issues

CMake Error at test/CMakeLists.txt:20 (add_library)

If i try to build epoll-shim:

git clone https://github.com/FreeBSDDesktop/epoll-shim.git
cd epoll-shim
mkdir build
cd build
cmake .. -DCMAKE_BUILD_TYPE=RelWithDebInfo && cmake --build .

The cmake .. -DCMAKE_BUILD_TYPE=RelWithDebInfo fails with:

CMake Error at test/CMakeLists.txt:20 (add_library):
  add_library cannot create target "epoll-shim" because another target with
  the same name already exists.  The existing target is a shared library
  created in source directory "/home/_____/epoll-shim/src".  See
  documentation for policy CMP0002 for more details.


-- Configuring incomplete, errors occurred!
See also "/home/_____/epoll-shim/build/CMakeFiles/CMakeOutput.log".
See also "/home/_____/epoll-shim/build/CMakeFiles/CMakeError.log".

CMakeOutput.log:

The system is: Linux - 6.5.0-26-generic - x86_64
Compiling the C compiler identification source file "CMakeCCompilerId.c" succeeded.
Compiler: /usr/bin/cc 
Build flags: 
Id flags:  

The output was:
0


Compilation of the C compiler identification source "CMakeCCompilerId.c" produced "a.out"

The C compiler identification is GNU, found in "/home/_____/epoll-shim/build/CMakeFiles/3.22.1/CompilerIdC/a.out"

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Updating the port in FreeBSD (support for eventfd, and some more fixes)

Thank you for maintaining the port in FreeBSD!

Since the 0.0.20190311 version in ports I've implemented some features and fixes (https://github.com/jiixyj/epoll-shim):

eventfd support (needed for pipewire)
support for more than 32 timerfds per process (by using kqueue timers if possible)
removal of the poll fd hack
added a pkg-config file (modeled after the one in the port, thanks!)
removed the old Makefile, replaced with a CMake build system. Hopefully the library should be easier to package and use now.

I've tried to update the ports files here: https://github.com/jiixyj/freebsd-ports/tree/libepoll-shim/devel/libepoll-shim . Feel free to take/adapt them! I could remove some hacks needed for the old Makefile and replace them by simply using "USES= cmake".

Also, I'd be very happy if someone could point me to some guides/documentation on how to use Wayland on FreeBSD (preferably sway). Currently I'm using i3 on Xorg and libinput is the only library I can really test epoll-shim with.

Lastly, please let me know if there are any bugs/features or if I can make the library easier to package!

High CPU consumption with wayland 1.17.91

Hello. After upgrading x11-wm/sway to a new version 1.4 I found it completely unusable (what a surprise!) Turns out it uses too much per-process timers and the kernel simply refuses to create more, rendering sway unusable. One solution to this problem is to bump TIMER_MAX in /usr/src/sys/sys/timers.h and recompile the kernel (hopefully, it doesn't break userland). The other solution is to upgrade to wayland 1.17.91 which tracks timers in userland and require only one timer from the kernel.
Obviously, it works in Linux, but in FreeBSD it causes to abnormally high number of calls to kevent() and almost 100% CPU usage. You can look at the issue I created for sway here for detailed information.

For example, here is the number of calls to kevent() by firefox and sway in the period of about 10 seconds.

firefox                       kevent()                                     507
  sway                        kevent()                                10377444

You can take my port for a fresh wayland from here.

Any ideas what's going on?

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