模拟捕获SIGPIPE信号实现TCP服务器

最新推荐文章于 2024-07-24 12:58:31 发布

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本文介绍了一个简单的TCP服务器与客户端之间的通信示例。该示例使用C语言实现，展示了如何创建服务器来监听特定IP地址和端口，并接受来自客户端的消息。客户端则连接到指定的服务器地址并接收数据。

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server端代码：

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <sys/wait.h>
#include <unistd.h>
#include <arpa/inet.h>

void handler (int sig)   //信号处理函数
{
   printf("sig = %d\n", sig);
}

int main (int argc, char *argv[])
{
   int pid, bytes;
   int sockfd, newfd;
   socklen_t len;
   struct sockaddr_in my_addr, their_addr;
   char buffer[128];

   if (argc != 3){
       printf("Please input %s <IP-address> <Port>\n",argv[0]);
   }

   signal(SIGPIPE, handler); // 安装SIGPIPE 信号

   if (-1 == (sockfd = socket(AF_INET, SOCK_STREAM, 0))){ //创建socket文件描述符
       perror("Create socket failed");
       exit(EXIT_FAILURE);
   }

   memset(&my_addr, 0, sizeof(struct sockaddr_in*));
   my_addr.sin_family = AF_INET;
   my_addr.sin_port = htons(atoi(argv[2]));
   if (0 == (inet_aton(argv[1], (struct in_addr*) &my_addr.sin_addr.s_addr))){
       perror("argv[1]");
       exit(errno);
   }

   if(-1 == (bind(sockfd, (struct sockaddr *)&my_addr, sizeof(struct sockaddr)))){   // 绑定IP信息
       perror("bind failesd");
       exit(EXIT_FAILURE);
   }

   if (-1 == listen(sockfd, 5)){   //监听网络
       perror("listen failed");
       exit(EXIT_FAILURE);
   }

   len = sizeof(struct sockaddr_in);
   while(1){
       printf("Wait for new connect\n");
       if(-1 == (newfd = (accept(sockfd, (struct sockaddr *) &their_addr, &len)))){
           perror("Accept failed");
           exit(EXIT_FAILURE);
       }
       else{
           printf("server: got connection from %s, port %d\n",inet_ntoa(their_addr.sin_addr), ntohs(their_addr.sin_port));
           while (1){
               memset(&buffer, 0, 128);
               printf("pls send message to send:");
               fgets(buffer, 128, stdin);
               if ( !strncasecmp(buffer, "quit", 4)){
                   printf("I will quit!\n");
                   break;
               }
               bytes = write(newfd, buffer, strlen(buffer));
               if (bytes < 0){
                   printf("Send failure, errno code id %d, errno message is '%s'\n", errno, strerror(errno));
                   close(newfd);
                   break;
               }
               else
                   printf("Message :%s\t send successful, %dbyte send !\n", buffer, len);
           }
       }

   }
   close(sockfd);
   return 0;
}

client端代码：

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <sys/wait.h>
#include <unistd.h>
#include <arpa/inet.h>

int main (int argc, char *argv[])
{
   int sockfd, len;
   struct sockaddr_in dest;
   char buf[128];           //用于存放接收数据
   if (argc != 3){           //输入数据参数小于3个
       printf("Error format, it must be:\n %s IP_Address Port\n",argv[0]);
       exit(errno);
   }

   if (-1 == (sockfd = (socket(AF_INET, SOCK_STREAM, 0)))){ // 创建socket
       perror("Socket failed");
       exit(errno);
   }
   printf("Client socket Created\n");
   dest.sin_family = AF_INET;
   dest.sin_port = htons(atoi(argv[2]));
   if(0 == inet_aton(argv[1], (struct in_addr*) &dest.sin_addr.s_addr)){
       perror(argv[1]);
       exit(errno);
   }
   if(-1 == (connect(sockfd, (struct sockaddr *) &dest, sizeof(dest)))){
       perror("Connect failed");
       exit(errno);
   }
   memset(&buf, '\0', 128);
   while(1){
       len = recv(sockfd, buf, 128, 0);
       printf("Recvive data: buf = %s\n",buf);
   }
   close(sockfd);
   return 0; }