socket通信实例linux c
时间: 2023-11-21 10:47:44 浏览: 30
下面是一个简单的Linux C Socket通信实例:
服务端代码:
```
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#define PORT 6000
int main()
{
int sockfd, newsockfd, n;
char buffer[256];
struct sockaddr_in serv_addr, cli_addr;
socklen_t clilen;
sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (sockfd < 0)
{
perror("ERROR opening socket");
exit(1);
}
bzero((char *)&serv_addr, sizeof(serv_addr));
serv_addr.sin_family = AF_INET;
serv_addr.sin_addr.s_addr = INADDR_ANY;
serv_addr.sin_port = htons(PORT);
if (bind(sockfd, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) < 0)
{
perror("ERROR on binding");
exit(1);
}
while (1)
{
listen(sockfd, 5);
clilen = sizeof(cli_addr);
newsockfd = accept(sockfd, (struct sockaddr *)&cli_addr, &clilen);
if (newsockfd < 0)
{
perror("ERROR on accept");
exit(1);
}
bzero(buffer, 256);
n = read(newsockfd, buffer, 255);
if (n < 0)
{
perror("ERROR reading from socket");
exit(1);
}
printf("Here is the message: %s\n", buffer);
n = write(newsockfd, "I got your message", 18);
if (n < 0)
{
perror("ERROR writing to socket");
exit(1);
}
close(newsockfd);
}
close(sockfd);
return 0;
}
```
客户端代码:
```
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#define PORT 6000
int main(int argc, char *argv[])
{
int sockfd, n;
struct sockaddr_in serv_addr;
struct hostent *server;
char buffer[256];
if (argc < 2)
{
fprintf(stderr, "usage %s hostname\n", argv[0]);
exit(0);
}
server = gethostbyname(argv[1]);
if (server == NULL)
{
fprintf(stderr, "ERROR, no such host\n");
exit(0);
}
sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (sockfd < 0)
{
perror("ERROR opening socket");
exit(1);
}
bzero((char *)&serv_addr, sizeof(serv_addr));
serv_addr.sin_family = AF_INET;
bcopy((char *)server->h_addr_list[0], (char *)&serv_addr.sin_addr.s_addr, server->h_length);
serv_addr.sin_port = htons(PORT);
if (connect(sockfd, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) < 0)
{
perror("ERROR connecting");
exit(1);
}
printf("Please enter the message: ");
bzero(buffer, 256);
fgets(buffer, 255, stdin);
n = write(sockfd, buffer, strlen(buffer));
if (n < 0)
{
perror("ERROR writing to socket");
exit(1);
}
bzero(buffer, 256);
n = read(sockfd, buffer, 255);
if (n < 0)
{
perror("ERROR reading from socket");
exit(1);
}
printf("%s\n", buffer);
close(sockfd);
return 0;
}
```
运行方式:
1. 编译服务端代码:`gcc server.c -o server`
2. 编译客户端代码:`gcc client.c -o client`
3. 启动服务端:`./server`
4. 在另一个终端中启动客户端:`./client localhost`
其中,`localhost`可以替换为服务端的IP地址。在客户端中输入消息,服务端将接收到消息并回复“`I got your message`”。