Handler eopll 测试篇

需要接收端和测试端的可以看这篇
个人单纯测试方法
主要修改epoll_wait(epfd, ev_ret, EVENTS, -1)第 四个参数，对应java层 nativePollOnce(ptr, nextPollTimeoutMillis)的第二个参数;为啥要测试，就是为了理解这个方法到底是怎么执行的

#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <sys/epoll.h>
#include <arpa/inet.h>

#define EVENTS 12

int main(){
  int sock1;
  sockaddr_in addr1;
  int epfd;
  epoll_event ev, ev_ret[EVENTS];
  char buf[2048];
  int i;
  int nfds;
  int n;

  sock1 = socket(AF_INET, SOCK_DGRAM, 0);
  addr1.sin_family = AF_INET;

  inet_pton(AF_INET, "127.0.0.1", &addr1.sin_addr.s_addr);

  addr1.sin_port = htons(11111);

  bind(sock1, (sockaddr*)&addr1, sizeof(addr1));

  //参数不小于0就行
  epfd = epoll_create(1);
  if(epfd < 0){
    perror("epoll_create");
    return 1;
  }

  memset(&ev, 0, sizeof(ev));
  ev.events = EPOLLIN;//只读
  ev.data.fd = sock1;//把sock1加到epoll
  if(epoll_ctl(epfd, EPOLL_CTL_ADD, sock1, &ev) != 0){
    perror("epoll_ctl");
    return 1;
  }


  while(1){
    printf("before epoll_wait\n");
    //在这里会阻塞，只等待10秒，超过10秒，epoll_wait函数结束，返回0给nfds.
    nfds = epoll_wait(epfd, ev_ret, EVENTS, -1);
    if(nfds < 0){
      perror("epoll_wait nfds");
      return 1;
    }

    printf("after epoll_wait\n");

  }

  close(sock1);
  return 0;
}