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//
// Created by jxq on 19-8-7.
//
// socket编程 9
#include <iostream>
#include <stdio.h>
#include <cstring>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
using namespace std;
struct packet
{
int len;
char buf[1024];
};
#define ERR_EXIT(m) \
do \
{ \
perror(m); \
exit(EXIT_FAILURE); \
} while(0);
ssize_t readn(int fd, void *buf, size_t count)
{
size_t nleft = count; // 剩余字节数
ssize_t nread;
char *bufp = (char*) buf;
while (nleft > 0)
{
nread = read(fd, bufp, nleft);
if (nread < 0)
{
if (errno == EINTR)
{
continue;
}
return -1;
} else if (nread == 0)
{
return count - nleft;
}
bufp += nread;
nleft -= nread;
}
return count;
}
ssize_t writen(int fd, const void *buf, size_t count)
{
size_t nleft = count;
ssize_t nwritten;
char* bufp = (char*)buf;
while (nleft > 0)
{
if ((nwritten = write(fd, bufp, nleft)) < 0)
{
if (errno == EINTR)
{
continue;
}
return -1;
}
else if (nwritten == 0)
{
continue;
}
bufp += nwritten;
nleft -= nwritten;
}
return count;
}
ssize_t recv_peek(int sockfd, void *buf, size_t len)
{
while (1)
{
int ret = recv(sockfd, buf, len, MSG_PEEK); // 查看传入消息
if (ret == -1 && errno == EINTR)
{
continue;
}
return ret;
}
}
ssize_t readline(int sockfd, void *buf, size_t maxline)
{
int ret;
int nread;
char *bufp = (char*)buf; // 当前指针位置
int nleft = maxline;
while (1)
{
ret = recv_peek(sockfd, buf, nleft);
if (ret < 0)
{
return ret;
}
else if (ret == 0)
{
return ret;
}
nread = ret;
int i;
for (i = 0; i < nread; i++)
{
if (bufp[i] == '\n')
{
ret = readn(sockfd, bufp, i+1);
if (ret != i+1)
{
exit(EXIT_FAILURE);
}
return ret;
}
}
if (nread > nleft)
{
exit(EXIT_FAILURE);
}
nleft -= nread;
ret = readn(sockfd, bufp, nread);
if (ret != nread)
{
exit(EXIT_FAILURE);
}
bufp += nread;
}
return -1;
}
void echo_srv(int connfd)
{
char recvbuf[1024];
// struct packet recvbuf;
int n;
while (1)
{
memset(recvbuf, 0, sizeof recvbuf);
int ret = readline(connfd, recvbuf, 1024);
if (ret == -1)
{
ERR_EXIT("readline");
}
if (ret == 0)
{
printf("client close\n");
break;
}
fputs(recvbuf, stdout);
writen(connfd, recvbuf, strlen(recvbuf));
}
}
int main(int argc, char** argv) {
// 1. 创建套接字
int listenfd;
if ((listenfd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0) {
ERR_EXIT("socket");
}
// 2. 分配套接字地址
struct sockaddr_in servaddr;
memset(&servaddr, 0, sizeof servaddr);
servaddr.sin_family = AF_INET;
servaddr.sin_port = htons(6666);
servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
// servaddr.sin_addr.s_addr = inet_addr("127.0.0.1");
// inet_aton("127.0.0.1", &servaddr.sin_addr);
int on = 1;
// 确保time_wait状态下同一端口仍可使用
if (setsockopt(listenfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof on) < 0) {
ERR_EXIT("setsockopt");
}
// 3. 绑定套接字地址
if (bind(listenfd, (struct sockaddr *) &servaddr, sizeof servaddr) < 0) {
ERR_EXIT("bind");
}
// 4. 等待连接请求状态
if (listen(listenfd, SOMAXCONN) < 0) {
ERR_EXIT("listen");
}
// 5. 允许连接
struct sockaddr_in peeraddr;
socklen_t peerlen;
// 6. 数据交换
int nready;
int maxfd = listenfd;
fd_set rset;
fd_set allset;
FD_ZERO(&rset);
FD_ZERO(&allset);
FD_SET(listenfd, &allset);
int connfd;
int i;
int client[FD_SETSIZE];
int ret;
int Max = 0;
memset(client, -1, sizeof(client));
while (1)
{
rset = allset;
nready = select(maxfd + 1, &rset, NULL, NULL, NULL);
if (nready == -1)
{
if (errno == EINTR)
{
continue;
}
ERR_EXIT("select");
}
if (nready == 0)
{
continue;
}
if (FD_ISSET(listenfd, &rset))
{
peerlen = sizeof(peeraddr);
connfd = accept(listenfd, (struct sockaddr *)&peeraddr, &peerlen);
if (connfd == -1)
{
ERR_EXIT("accept");
}
for (i = 0; i < FD_SETSIZE; i++)
{
if (client[i] < 0)
{
client[i] = connfd;
break;
}
}
if (i == FD_SETSIZE)
{
fprintf(stderr, "too many clients\n");
exit(EXIT_FAILURE);
}
printf("id = %s, ", inet_ntoa(peeraddr.sin_addr));
printf("port = %d\n", ntohs(peeraddr.sin_port));
FD_SET(connfd, &allset);
Max++;
maxfd = max(maxfd, connfd);
if (--nready <= 0)
{
continue;
}
}
for (i = 0; i < Max; ++i)
{
connfd = client[i];
if (connfd == -1)
{
continue;
}
if (FD_ISSET(connfd, &rset))
{
char recvbuf[1024] = {0};
ret = readline(connfd, recvbuf, 1024);
if (ret == -1)
{
ERR_EXIT("readline");
}
if (ret == 0)
{
printf("client close\n");
client[i] = -1;
FD_CLR(connfd, &allset);
Max--;
}
fputs(recvbuf, stdout);
//sleep(4);
writen(connfd, recvbuf, strlen(recvbuf));
if (--nready <= 0)
{
break;
}
};
}
}
// pid_t pid;
// while (1) {
// int connfd;
// if ((connfd = accept(listenfd, (struct sockaddr *) &peeraddr, &peerlen)) < 0) {
// ERR_EXIT("accept");
// }
//
// printf("id = %s, ", inet_ntoa(peeraddr.sin_addr));
// printf("port = %d\n", ntohs(peeraddr.sin_port));
//
// pid = fork();
//
// if (pid == -1) {
// ERR_EXIT("fork");
// }
// if (pid == 0) // 子进程
// {
// close(listenfd);
// echo_srv(connfd);
// //printf("child exit\n");
// exit(EXIT_SUCCESS);
// } else {
// //printf("parent exit\n");
// close(connfd);
// }
//
//
// }
// 7. 断开连接
close(listenfd);
return 0;
}
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