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自己写的epoll框架(第七根弦)

第七根弦 2015 年 11 月 3 日 UC, 网络架构 发表评论 (0)

自己写的epoll框架,不知道为什么listen的第二个参数必须写0,否则用robot并发连接测试的时候,发现连接完成后有大量类似下图的情况。在用telnet发送数据时,没有回显。只要服务端不重启,这个一直存在,而且后面的client再连接也收不到消息
20151103111102
条数刚好是listen第二个参数的大小,废话不说,知道如何解决这个问题的教教我啊！！！

上epoll.cpp的代码

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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <string>
#include <errno.h>
#include <sys/epoll.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netinet/in.h>
 
const short PORT = 9999;
const int MAX_EVENT = 20;
 
void setnonblock(int fd)
{
long flags = fcntl(fd, F_GETFL);
if (flags < 0)
{
perror("fcntl F_GETFL");
return;
}
flags |= O_NONBLOCK;
if (fcntl(fd, F_SETFL, flags) < 0)
{
perror("fcntl F_SETFL");
return;
}
}
 
int main()
{
int epfd =epoll_create(1);
if (epfd < 0)
{
perror("epoll_create");
exit(EXIT_FAILURE);
}
 
int sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (sockfd < 0)
{
perror("socket");
exit(EXIT_FAILURE);
}
 
epoll_event ev;
ev.events = EPOLLIN | EPOLLET;
ev.data.fd = sockfd;
epoll_ctl(epfd, EPOLL_CTL_ADD, sockfd, &ev);
 
sockaddr_in srvAddr;
socklen_t socklen = sizeof(sockaddr_in);
 
memset(&srvAddr, 0, socklen);
srvAddr.sin_family = AF_INET;
srvAddr.sin_addr.s_addr = INADDR_ANY;
srvAddr.sin_port = htons(PORT);
 
int yes = 1;
setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes));
 
setnonblock(sockfd);
 
if (bind(sockfd, (sockaddr*)&srvAddr, socklen) < 0)
{
perror("bind");
exit(EXIT_FAILURE);
}
 
// 避免 TIME_WAIT
struct linger so_linger;
so_linger.l_onoff=1;
so_linger.l_linger=0;
setsockopt(sockfd, SOL_SOCKET, SO_LINGER, &so_linger, sizeof so_linger);
 
// if (listen(sockfd, 10) < 0) 用10总是出现上述问题
if (listen(sockfd, 0) < 0)
{
perror("listen");
exit(EXIT_FAILURE);
}
 
epoll_event event[MAX_EVENT];
for (;;)
{
int ndfs = epoll_wait(epfd, event, MAX_EVENT, -1);
if (ndfs < 0)
{
int errornum = errno;
if (errornum != 4)
printf("=========== EPOLL_WAIT: %s(%d)\n", strerror(errornum), errornum);
continue;
}
else
{
printf("==========================EPOLL_WAIT  num: %d  ========\n", ndfs);
}
for (int i = 0; i < ndfs; ++i)
{
int activefd = event[i].data.fd;
if (activefd == sockfd)
{
sockaddr_in cltAddr;
int newfd = accept(sockfd, (sockaddr*)&cltAddr, &socklen);
if (newfd < 0)
{
perror("accept");
continue;
}
 
setnonblock(newfd);
printf("%d connect from %s\n", newfd, inet_ntoa(cltAddr.sin_addr));
 
ev.events = EPOLLIN | EPOLLET;
ev.data.fd = newfd;
epoll_ctl(epfd, EPOLL_CTL_ADD, newfd, &ev);
}
else if (event[i].events & EPOLLIN)
{
std::string recvData;
char buff[1024] = { 0 };
printf("EPOLLIN\n");
bool bRecvOver = false;
do
{
int len = recv(activefd, buff, sizeof(buff), 0);
if (len < 0)
{
int errornum = errno;
if (errornum == EAGAIN)
{
bRecvOver = true;
break;
}
else if (errornum == ECONNRESET)
{
ev.data.fd = -1;
epoll_ctl(epfd, EPOLL_CTL_DEL, activefd, &ev);
close(activefd);
bRecvOver = false;
break;
}
printf("================= RECV: %s(%d)\n", strerror(errornum), errornum);
ev.data.fd = -1;
epoll_ctl(epfd, EPOLL_CTL_DEL, activefd, &ev);
close(activefd);
bRecvOver = false;
break;
}
if (len == 0)
{
printf("%d disconnect\n", activefd);
ev.data.fd = -1;
epoll_ctl(epfd, EPOLL_CTL_DEL, activefd, &ev);
close(activefd);
bRecvOver = false;
break;
}
recvData.append(buff, len);
memset(buff, 0, sizeof(buff));
}while(true);
 
if (bRecvOver)
{
printf("recv from %d: %s\n", activefd, recvData.c_str());
ev.data.fd = activefd;
ev.events = EPOLLOUT | EPOLLET;
epoll_ctl(epfd, EPOLL_CTL_MOD, activefd, &ev);
}
}
else if (event[i].events & EPOLLOUT)
{
char buff[1024] = { 0 };
printf("EPOLLOUT\n");
sprintf(buff, "hello %d\n", activefd);
int len = send(activefd, buff, strlen(buff), 0);
if (len < 0)
{
int errornum = errno;
printf("================= SEND: %s(%d)\n", strerror(errornum), errornum);
ev.data.fd = -1;
epoll_ctl(epfd, EPOLL_CTL_DEL, activefd, &ev);
close(activefd);
continue;
}
 
ev.data.fd = activefd;
ev.events = EPOLLIN | EPOLLET;
epoll_ctl(epfd, EPOLL_CTL_MOD, activefd, &ev);
}
else
{
printf("ERRORERRORERRORERROR\n");
}
}
}
close(sockfd);
return 0;
}

感觉问题也有可能出现在测试并发的程序上:
robot.cpp

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#include <cstdio>
#include <cstring>
#include <unistd.h>
#include <pthread.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <arpa/inet.h>
#include <errno.h>
#include <string.h>
 
const int mm = 10000;
 
const short target_port = 9999;
const char* target_ip = "192.168.0.20";
 
//pthread_mutex_t mutex;
 
void* func(void* arg)
{
int* m = (int*)arg;
int mm = *m;
int sockfd = socket(PF_INET, SOCK_STREAM, 0);
if (sockfd < 0)
{
perror("socket");
// pthread_exit(NULL);
return NULL;
}
 
sockaddr_in s1;
memset(&s1, 0, sizeof(sockaddr_in));
s1.sin_family = AF_INET;
s1.sin_port = htons(target_port);
s1.sin_addr.s_addr = inet_addr(target_ip);
 
// int yes = 1;
// setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes));
 
connect(sockfd, (sockaddr*)&s1, sizeof(sockaddr_in));
 
char buff[1024] = {0};
sprintf(buff, "%d", mm);
// while(1)
// {
int len = send(sockfd, buff, strlen(buff), 0);
if (len < 0)
{
perror("send len < 0");
return NULL;
}
else if (len == 0)
{
perror("send len == 0");
return NULL;
}
printf("send: %s\n", buff);
memset(buff, 0, sizeof(buff));
len = recv(sockfd, buff, sizeof(buff), 0);
if (len < 0)
{
int errornum = errno;
if (errornum == EAGAIN || errornum == EINTR)
{
printf("errno == EAGAIN or errno == EINTR\n");
close(sockfd);
return NULL;
// continue;
}
else if (errornum == ECONNRESET)
{
printf("errno == ECONNRESET\n");
close(sockfd);
return NULL;
// break;
}
else
{
printf("errno != EAGAIN and errno != EINTR errno = %d %s\n", errornum, strerror(errornum));
close(sockfd);
return NULL;
// break;
}
}
else if (len == 0)
{
close(sockfd);
return NULL;
}
else
{
printf("recv: %s\n", buff);
}
// close(sockfd);
// break;
// }
return NULL;
}
 
int main()
{
pthread_t pid[mm];
// pthread_mutex_init(&mutex, NULL);
for (int i = 0; i < mm; ++i)
{
// usleep(1000);
int m = i;
pthread_create(&pid[i], NULL, func, (void*)&m);
usleep(1000);
}
for (int i = 0; i < mm; ++i)
{
pthread_join(pid[i], NULL);
}
// pthread_mutex_destroy(&mutex);
return 0;
}

==================== 问题已解决 ====================
问题终于解决了,EPOLLET模式下高并发连接,accept只触发一次,所以应该在把accept也放到while循环内,判断accept的返回值,返回值为-1并且errno的值为EAGAIN或EWOULDBLOCK时,说明可以退出该循环了。
下面是新的epoll.cpp的代码:

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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <string>
#include <errno.h>
#include <sys/epoll.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netinet/in.h>
 
const short PORT = 9999;
const int MAX_EVENT = 20;
 
void setnonblock(int fd)
{
long flags = fcntl(fd, F_GETFL);
if (flags < 0)
{
perror("fcntl F_GETFL");
return;
}
flags |= O_NONBLOCK;
if (fcntl(fd, F_SETFL, flags) < 0)
{
perror("fcntl F_SETFL");
return;
}
}
 
int main()
{
int epfd =epoll_create(1);
if (epfd < 0)
{
perror("epoll_create");
exit(EXIT_FAILURE);
}
 
int sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (sockfd < 0)
{
perror("socket");
exit(EXIT_FAILURE);
}
 
epoll_event ev;
ev.events = EPOLLIN | EPOLLET;
ev.data.fd = sockfd;
epoll_ctl(epfd, EPOLL_CTL_ADD, sockfd, &ev);
 
sockaddr_in srvAddr;
socklen_t socklen = sizeof(sockaddr_in);
 
memset(&srvAddr, 0, socklen);
srvAddr.sin_family = AF_INET;
srvAddr.sin_addr.s_addr = INADDR_ANY;
srvAddr.sin_port = htons(PORT);
 
int yes = 1;
setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes));
 
setnonblock(sockfd);
 
if (bind(sockfd, (sockaddr*)&srvAddr, socklen) < 0)
{
perror("bind");
exit(EXIT_FAILURE);
}
 
// 避免 TIME_WAIT
struct linger so_linger;
so_linger.l_onoff=1;
so_linger.l_linger=0;
setsockopt(sockfd, SOL_SOCKET, SO_LINGER, &so_linger, sizeof so_linger);
 
if (listen(sockfd, 10) < 0)
{
perror("listen");
exit(EXIT_FAILURE);
}
 
epoll_event event[MAX_EVENT];
for (;;)
{
int ndfs = epoll_wait(epfd, event, MAX_EVENT, -1);
if (ndfs < 0)
{
int errornum = errno;
if (errornum != 4)
printf("=========== EPOLL_WAIT: %s(%d)\n", strerror(errornum), errornum);
continue;
}
else
{
printf("==========================EPOLL_WAIT  num: %d  ========\n", ndfs);
}
for (int i = 0; i < ndfs; ++i)
{
int activefd = event[i].data.fd;
if (activefd == sockfd)
{
sockaddr_in cltAddr;
while (true)
{
int newfd = accept(sockfd, (sockaddr*)&cltAddr, &socklen);
if (newfd < 0)
{
if (errno == EAGAIN)
{
printf("accept EAGAIN\n");
break;
}
perror("accept");
}
 
setnonblock(newfd);
printf("%d connect from %s\n", newfd, inet_ntoa(cltAddr.sin_addr));
 
ev.events = EPOLLIN | EPOLLET;
ev.data.fd = newfd;
epoll_ctl(epfd, EPOLL_CTL_ADD, newfd, &ev);
}
}
else if (event[i].events & EPOLLIN)
{
std::string recvData;
char buff[1024] = { 0 };
printf("EPOLLIN\n");
bool bRecvOver = false;
do
{
int len = recv(activefd, buff, sizeof(buff), 0);
if (len < 0)
{
int errornum = errno;
if (errornum == EAGAIN)
{
bRecvOver = true;
break;
}
else if (errornum == ECONNRESET)
{
ev.data.fd = -1;
epoll_ctl(epfd, EPOLL_CTL_DEL, activefd, &ev);
close(activefd);
bRecvOver = false;
break;
}
printf("================= RECV: %s(%d)\n", strerror(errornum), errornum);
ev.data.fd = -1;
epoll_ctl(epfd, EPOLL_CTL_DEL, activefd, &ev);
close(activefd);
bRecvOver = false;
break;
}
if (len == 0)
{
printf("%d disconnect\n", activefd);
ev.data.fd = -1;
epoll_ctl(epfd, EPOLL_CTL_DEL, activefd, &ev);
close(activefd);
bRecvOver = false;
break;
}
recvData.append(buff, len);
memset(buff, 0, sizeof(buff));
}while(true);
 
if (bRecvOver)
{
printf("recv from %d: %s\n", activefd, recvData.c_str());
ev.data.fd = activefd;
ev.events = EPOLLOUT | EPOLLET;
epoll_ctl(epfd, EPOLL_CTL_MOD, activefd, &ev);
}
}
else if (event[i].events & EPOLLOUT)
{
char buff[1024] = { 0 };
printf("EPOLLOUT\n");
sprintf(buff, "hello %d\n", activefd);
int len = send(activefd, buff, strlen(buff), 0);
if (len < 0)
{
int errornum = errno;
printf("================= SEND: %s(%d)\n", strerror(errornum), errornum);
ev.data.fd = -1;
epoll_ctl(epfd, EPOLL_CTL_DEL, activefd, &ev);
close(activefd);
continue;
}
 
ev.data.fd = activefd;
ev.events = EPOLLIN | EPOLLET;
epoll_ctl(epfd, EPOLL_CTL_MOD, activefd, &ev);
}
else
{
printf("ERRORERRORERRORERROR\n");
}
}
}
close(sockfd);
return 0;
}

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