通过.net core调用so文件的方法

#include <X11/extensions/scrnsaver.h>
#include <stdio.h>
int main(void) {
    printf("%u\n", getIdleTime());
}
int getIdleTime(){
    Display *dpy = XOpenDisplay(NULL);
    if (!dpy) {
        return(1);
    }
    XScreenSaverInfo *info = XScreenSaverAllocInfo();
    XScreenSaverQueryInfo(dpy, DefaultRootWindow(dpy), info);
    return info->idle;
}

gcc getIdle.c -fPIC -shared -o getIdle.so  -lXss -lX11

internal class Program
    {
        [DllImport("getIdle.so", EntryPoint = "getIdleTime")]
        private static extern IntPtr getIdleTime();
        static void Main(string[] args)
        {
            var after = DateTime.Now.AddSeconds(10);
            while (after >= DateTime.Now)
            {
                Console.WriteLine(GetIdleTime());
                Thread.Sleep(1000);
            }
        }
        /// <summary>
        /// 调用getIdle.so获取系统空闲时间
        /// </summary>
        /// <returns></returns>
        internal static int GetIdleTime()
        {
            return getIdleTime().ToInt32();
        }
    }