C语言两个进程相互通信—socket

client.c

C代码


#include <sys/types.h>
#include <sys/socket.h>
#include <stdio.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <stdlib.h>
int main()
{
int sockfd;
int len;
struct sockaddr_in address;
int result;
int i,byte;
char char_recv,char_send;
if((sockfd = socket(AF_INET,SOCK_STREAM,0)) == -1)
{
perror("socket");
exit(EXIT_FAILURE);
}
address.sin_family = AF_INET;
address.sin_addr.s_addr = inet_addr("127.0.0.1");
address.sin_port = 8080;
len = sizeof(address);
if((result = connect(sockfd,(struct sockaddr *)&address,len)) == -1)
{
perror("connect");
exit(EXIT_FAILURE);
}

printf("please enter the context you want to send to server :");
scanf("%c",&char_send);

if(byte = send(sockfd,&char_send,1,0) == -1)
{
perror("send");
exit(EXIT_FAILURE);
}
if(byte = recv(sockfd,&char_recv,1,0) == -1)
{
perror("recv");
exit(EXIT_FAILURE);
}
printf("receive from server %c\n",char_recv);

close(sockfd);
exit(0);
}

server.c

C代码


#include <sys/types.h>
#include <sys/socket.h>
#include <stdio.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <stdlib.h>
char dict(char temp)
{
if(temp == 'Z')
{
return 'A';
}
return temp+1;
}
int main()
{
int server_sockfd,client_sockfd;
int server_len,client_len;
struct sockaddr_in server_address;
struct sockaddr_in client_address;
int i,btye;
char char_recv,char_send;

server_address.sin_family = AF_INET;
server_address.sin_addr.s_addr = inet_addr("127.0.0.1");
server_address.sin_port = 8080;
server_len = sizeof(server_address);

server_sockfd = socket(AF_INET,SOCK_STREAM,0);

bind(server_sockfd,(struct sockaddr *)&server_address,server_len);

listen(server_sockfd,5);
printf("server waiting for connect\n");

client_len = sizeof(client_address);
client_sockfd = accept(server_sockfd,(struct sockaddr *)&client_address,(socklen_t *)&client_len);

if(btye = recv(client_sockfd,&char_recv,1,0) == -1)
{
perror("recv");
exit(EXIT_FAILURE);
}
printf("receive from client is %c\n",char_recv);
char_send = dict(char_recv);
if(btye = send(client_sockfd,&char_send,1,0) == -1)
{
perror("send");
exit(EXIT_FAILURE);
}

shutdown(client_sockfd,2);
shutdown(server_sockfd,2);
return 0;
}