系统编程之高级文件IO（十五）——poll，epoll简单使用和异步IO及总结

#include <stdio.h>
#include <stdlib.h>
#include <sys/time.h>
#include <unistd.h>
#include <sys/types.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <poll.h>
int main(int argc, char const *argv[])
{
    int fd;
    if((fd = open("/dev/input/mouse0", O_RDWR | O_CREAT, 0655)) < 0)
    {
        perror("open file error!");
        exit(1);
    }
    struct pollfd fds[2];
    fds[0].fd = 0;
    fds[0].events = POLLIN;
    fds[1].fd = fd;
    fds[1].events = POLLIN;
    while(1)
    {
        int ret = poll(fds, 2, -1);
        for (size_t i = 0; i < 2; i++)
        {
            if (fds[i].events == fds[i].revents)
            {
                if (fds[i].fd == 0)
                {
                    char buffer[1024];
                    read(fds[i].fd, buffer, sizeof(buffer));
                    printf("buffer = %s\n",buffer);
                }
                else if (fds[i].fd == fd)
                {
                    int cor;
                    read(fds[i].fd, &cor, sizeof(cor));
                    printf("cor = %d\n", cor);
                }
                if (--ret == 0)
                {
                    break;
                }
            }
        }
    }
    return 0;
}