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| #include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/epoll.h>
#include <netdb.h>
#include <fcntl.h>
#include <sys/wait.h>
#include <time.h>
#include <signal.h>
#define COUNT 1
int mode = 0;
int slp = 0;
int pid[COUNT] = {0};
int count = 0;
void server(int epfd)
{
struct epoll_event *events;
int num, i;
struct timespec ts;
events = calloc(64, sizeof(struct epoll_event));
while (1) {
int sd, csd;
struct sockaddr in_addr;
num = epoll_wait(epfd, events, 64, -1);
if (num <= 0) {
continue;
}
/*
ts.tv_sec = 0;
ts.tv_nsec = 1;
if(nanosleep(&ts, NULL) != 0) {
perror("nanosleep");
exit(1);
}
*/
// 用于测试ET模式下丢事件的情况
if (slp) {
sleep(slp);
}
sd = events[0].data.fd;
socklen_t in_len = sizeof(in_addr);
csd = accept(sd, &in_addr, &in_len);
if (csd == -1) {
// 打印这个说明中了epoll LT惊群的招了。
printf("shit xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx:%d\n", getpid());
continue;
}
// 本进程一共成功处理了多少个请求。
count ++;
printf("get client:%d\n", getpid());
close(csd);
}
}
static void siguser_handler(int sig)
{
// 在主进程被Ctrl-C退出的时候，每一个子进程均要打印自己处理了多少个请求。
printf("pid:%d count:%d\n", getpid(), count);
exit(0);
}
static void sigint_handler(int sig)
{
int i = 0;
// 给每一个子进程发信号，要求其打印自己处理了多少个请求。
for (i = 0; i < COUNT; i++) {
kill(pid[i], SIGUSR1);
}
}
int main (int argc, char *argv[])
{
int ret = 0;
int listener;
int c = 0;
struct sockaddr_in saddr;
int port;
int status;
int flags;
int epfd;
struct epoll_event event;
if (argc < 4) {
exit(1);
}
// 0为LT模式，1为ET模式
mode = atoi(argv[1]);
port = atoi(argv[2]);
// 是否在处理accept之前耽搁一会儿，这个参数更容易重现问题
slp = atoi(argv[3]);
signal(SIGINT, sigint_handler);
listener = socket(PF_INET, SOCK_STREAM, 0);
saddr.sin_family = AF_INET;
saddr.sin_port = htons(port);
saddr.sin_addr.s_addr = INADDR_ANY;
bind(listener, (struct sockaddr*)&saddr, sizeof(saddr));
listen(listener, SOMAXCONN);
flags = fcntl (listener, F_GETFL, 0);
flags |= O_NONBLOCK;
fcntl (listener, F_SETFL, flags);
epfd = epoll_create(64);
if (epfd == -1) {
perror("epoll_create");
abort();
}
event.data.fd = listener;
event.events = EPOLLIN;
if (mode == 1) {
event.events |= EPOLLET;
} else if (mode == 2) {
event.events |= EPOLLONESHOT;
}
ret = epoll_ctl(epfd, EPOLL_CTL_ADD, listener, &event);
if (ret == -1) {
perror("epoll_ctl");
abort();
}
for(c = 0; c < COUNT; c++) {
int child;
child = fork();
if(child == 0) {
// 安装打印count值的信号处理函数
signal(SIGUSR1, siguser_handler);
server(epfd);
}
pid[c] = child;
printf("server:%d pid:%d\n", c+1, child);
}
wait(&status);
sleep(1000000);
close (listener);
}
|
