嵌入式　TCP网络编程实例

来源：互联网发布：淘宝店铺资金要多久编辑：程序博客网时间：2024/05/19 20:39

server.c

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

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <net/if.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <net/route.h>
#include <unistd.h>
#include <signal.h>

#include <sys/time.h>
#include <string.h>
#include <stdio.h>
#include <fcntl.h>
#include <dirent.h>
#include <sys/vfs.h>

#define SERVER_PORT 8003
#define BACKLOG 10
int main(void)
{
int sockfd,conn_fd;
struct sockaddr_inmy_addr;
struct sockaddr_intheir_addr;
intsin_size;
if ((sockfd = socket(AF_INET,SOCK_STREAM, 0)) == -1)
{
     fprintf(stderr,"socket error!\n");
     exit(1);
}
my_addr.sin_family =AF_INET;
my_addr.sin_port =htons(SERVER_PORT);
my_addr.sin_addr.s_addr =INADDR_ANY;
bzero(&(my_addr.sin_zero), 8);
if (bind(sockfd, (structsockaddr *)&my_addr, sizeof(struct sockaddr)) ==-1)
{
     fprintf(stderr,"bind error!\n");
     exit(1);
}
if (listen(sockfd, BACKLOG)== -1)
{
     fprintf(stderr,"listen error!\n");
     exit(1);
}
while (1)
{
     sin_size =sizeof(struct sockaddr_in);
     if ((conn_fd= accept(sockfd, (struct sockaddr *)&their_addr,&sin_size)) == -1)
     {
       fprintf(stderr, "accepterror!\n");
       continue;
     }
     printf("server:got connection from %s\n",inet_ntoa(their_addr.sin_addr));
     if(!fork())
     {
       if(send(conn_fd, "Hello, world!\n", 14, 0) == -1)
         fprintf(stderr, "send error!\n");
       close(conn_fd);
       exit(0);
     }
     close(conn_fd);
     while(waitpid(-1,NULL, WNOHANG) > 0);
}
}
client.c

#include <sys/time.h>
#include <string.h>
#include <stdio.h>
#include <fcntl.h>
#include <dirent.h>
#include <sys/vfs.h>

#define SERVER_PORT 8003
#define MAXDATASIZE 100
int main(int argc, char *argv[])
{
int sockfd,numbytes;
charbuf[MAXDATASIZE];
struct hostent*he;
struct sockaddr_inserv_addr;
if (argc !=2)
{
     fprintf(stderr,"usage: cilent hostname\n");
     exit(1);
}
if ((he =gethostbyname(argv[1])) == NULL)
{
     fprintf(stderr,"gethostbyname error!\n");
     exit(1);
}
if ((sockfd = socket(AF_INET,SOCK_STREAM, 0)) == -1)
{
     fprintf(stderr,"socket error!\n");
     exit(1);
}
serv_addr.sin_family =AF_INET;
serv_addr.sin_port =htons(SERVER_PORT);
serv_addr.sin_addr =*((struct in_addr *)he->h_addr);
bzero(&(serv_addr.sin_zero), 8);
if (connect(sockfd, (structsockaddr *)&serv_addr, sizeof(struct sockaddr)) ==-1)
{
     fprintf(stderr,"connect error!\n");
     exit(1);
}
if ((numbytes = read(sockfd,buf, MAXDATASIZE)) == -1)
{
     fprintf(stderr,"read error!\n");
     exit(1);
}
buf[numbytes] ='\0';
printf("Received: %s",buf);
close(sockfd);
}
编译：
gcc server.c -o server
gcc client.c -o client
执行：
打开一终端执行：./server
打开另一终端执行：./client 127.0.0.1

嵌入式 TCP网络编程实例

嵌入式　TCP网络编程实例