Socket编程时recv函数错误：Transport endpoint is not connected的解决
今天在做socket网络通信实验时，server端执行到recv函数处报错：Transport endpoint is not connected。
以下是server和client的源码：
server.c
1 #include <stdio.h> 2 #include <arpa/inet.h> 3 #include <sys/socket.h> 4 #include <string.h> 5 #include <unistd.h> 6 #include <stdlib.h> 7 #define SERVER_PORT 5000 8 9 10 int main(){ 11 /*地址初始化*/ 12 struct sockaddr_in serveraddr; 13 struct sockaddr_in clientaddr; 14 memset(&serveraddr,0,sizeof(serveraddr)); 15 serveraddr.sin_family = AF_INET; 16 serveraddr.sin_addr.s_addr = INADDR_ANY; 17 serveraddr.sin_port = htons(SERVER_PORT); 18 bzero(&(serveraddr.sin_zero),8); 19 //1.create sock 20 int sock,conn,sbind,lis; 21 char buf[32]; 22 sock = socket(AF_INET,SOCK_STREAM,0); 23 if(sock ==-1){perror("sock error");exit(1);} 24 //2.bind 25 sbind = bind(sock, (struct sockaddr*)&serveraddr, sizeof(serveraddr)); 26 if(sock ==-1){perror("bind error");exit(1);} 27 //3.listen 28 lis = listen(sock, 2); 29 if(lis ==-1){perror("listen error");exit(1);} 30 //4.accept 31 int acc,snd,rec; 32 int len = sizeof(struct sockaddr_in); 33 while(1){ 34 acc = accept(sock,(struct sockaddr*)&clientaddr, (socklen_t*)&len); 35 if(acc == -1){ 36 perror("accept error!");continue; 37 } 38 if((rec=recv(sock,buf,1024,0))==-1){perror("server connect failed!");exit(1);}//错误的地方 39 buf[rec]='\0'; 40 if(strcmp(buf,"liu")==0){ 41 snd = send(acc, "Hello，You are connected\n", 24, 0); 42 } 43 } 44 45 close(sock); 46 return 0; 47 }
client.c
#include <stdio.h>
#include <arpa/inet.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#define SERVER_PORT 5000
int main(){
/*地址初始化*/
struct sockaddr_in serveraddr;
memset(&serveraddr,0,sizeof(serveraddr));
serveraddr.sin_family = AF_INET;
serveraddr.sin_addr.s_addr = INADDR_ANY;
serveraddr.sin_port = htons(SERVER_PORT);
bzero(&(serveraddr.sin_zero),8);
//1.create sock
int sock,conn;
char buf[32];
sock = socket(AF_INET,SOCK_STREAM,0);
conn = connect(sock, (struct sockaddr*)&serveraddr, sizeof(serveraddr));
if(conn ==-1){perror("connect error");exit(1);}
int snd;
snd = send(sock, "liu", 4, 0);
if(snd ==-1){perror("send error");exit(1);}
int rec;
if((rec=recv(sock,buf,1024,0))==-1){perror("client connect failed!");exit(1);}
buf[rec]= '\0';
printf("received:%s",buf);
close(sock);
return 0;
}
错误出在recv这个函数。
首先我们来看看accept函数：int accept(int sockfd, void *addr, int *addrlen);
它的返回值是一个客户端的套接字描述符，所以recv和send函数的第一个参数应该填写accept返回的套接字描述符。
所以将server.c中的
if((rec=recv(sock,buf,1024,0))==-1){perror("server connect failed!");exit(1);}
改为：
if((rec=recv(acc,buf,1024,0))==-1){perror("server connect failed!");exit(1);}即可
