unix底下的多线程socket程序
unix底下的多线程socket程序,其想实现的内容是把收到的内容发送到指定的Server,并且把Server返回的内容返回到客户端,就像一个中转站一样,想用来做http的代理服务器的,但是现在程序老是down掉。大家看看有什么问题,向用多线程实现的。
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <unistd.h>
#include <fcntl.h>
#include <strings.h>
#include <stdio.h>
#include <errno.h>
#include <pthread.h>
#include <stdlib.h>
void * proxythread(void * args);
int main()
{
int listenfd;
int code;
struct sockaddr_in servaddr;
listenfd = socket(AF_INET, SOCK_STREAM, 0);
if(listenfd < 0)
printf("main error!\n");
bzero(&servaddr, sizeof(servaddr));
servaddr.sin_family = AF_INET;
servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
servaddr.sin_port = htons(8234);
code = bind(listenfd, (struct sockaddr *) &servaddr, sizeof(servaddr));
if(code < 0)
printf("bind error!\n");
listen(listenfd, 128);
for(;;)
{
pthread_t tid;
int * connfd = (int *)malloc(sizeof(int));
*connfd = accept(listenfd, (struct sockaddr *) NULL, NULL);
pthread_create(&tid, NULL, proxythread, connfd);
}
return 0;
}
void * proxythread(void * args)
{
int i = 0;
int connfd = *((int *)args);
free(args);
if(connfd < 0)
printf("accpet error!\n");
struct sockaddr_in proxyser;
int serfd = socket(AF_INET, SOCK_STREAM, 0);
if(serfd< 0)
printf("socekt error in child!\n");
bzero(&proxyser, sizeof(proxyser));
proxyser.sin_family = AF_INET;
proxyser.sin_port = htons(8081);
inet_pton(AF_INET, "22.11.98.229", &proxyser.sin_addr);
int code = connect(serfd, (struct sockaddr *) &proxyser, sizeof(proxyser));
if(code < 0)
printf("connect error!\n");
for(;;)
{
char buff[8192];
memset(buff, 0, 8192);
int size = recv(connfd, buff, sizeof(buff), MSG_NONBLOCK);
int size2 = send(serfd, buff, size,MSG_NONBLOCK);
if(size <= 0)
break;
}
for(;;)
{
char buff[8192];
memset(buff, 0, 8192);
int size = read(serfd, buff, sizeof(buff));
int size2 = write(connfd, buff, size);
if(size <= 0)
break;
}
close(serfd);
close(connfd);
return NULL;
}