for some reason closing evdev file descriptors takes ~30 ms on my laptop :/

evdev_close_slow.c

#include <fcntl.h>

int main()
{
    // leak 100 file descriptors, on exit the kernel will close them in one go
    for (int i = 0; i < 100; ++i)
        open("/dev/input/event0", O_RDONLY);
}