LinuxUDP网络通信
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UDP
前面已经讲过tcp网络通信,然后tcp每次通信都要进行三次握手连接,虽然传输的可靠性比较高,但对于一些及时性的数据的传输显得太过费时,所以就有了UDP这种无连接通信,但数据容易出错。
那些函数我这里就不讲了,直接看我上一个博客就行,我这里直接附例子了。
![](http://img.my.csdn.net/uploads/201212/03/1354538331_3221.gif)
udpserver.c
- <span style="font-family:SimSun;font-size:18px;">#include <stdlib.h>
- #include <stdio.h>
- #include <errno.h>
- #include <string.h>
- #include <unistd.h>
- #include <netdb.h>
- #include <sys/socket.h>
- #include <netinet/in.h>
- #include <sys/types.h>
- #include <arpa/inet.h>
-
- #define SERVER_PORT 8888
- #define MAX_MSG_SIZE 1024
-
- void udps_respon(int sockfd)
- {
- struct sockaddr_in addr;
- int addrlen,n;
- char msg[MAX_MSG_SIZE];
-
- while(1)
- {
- bzero(msg,sizeof(msg));
- addrlen = sizeof(struct sockaddr);
- n=recvfrom(sockfd,msg,MAX_MSG_SIZE,0,(struct sockaddr*)&addr,&addrlen);
- msg[n]=0;
-
- fprintf(stdout,"Server have received %s",msg);
- }
- }
-
- int main(void)
- {
- int sockfd;
- struct sockaddr_in addr;
-
-
- sockfd=socket(AF_INET,SOCK_DGRAM,0);
- if(sockfd<0)
- {
- fprintf(stderr,"Socket Error:%s\n",strerror(errno));
- exit(1);
- }
-
-
- bzero(&addr,sizeof(struct sockaddr_in));
- addr.sin_family=AF_INET;
- addr.sin_addr.s_addr=htonl(INADDR_ANY);
- addr.sin_port=htons(SERVER_PORT);
-
-
- if(bind(sockfd,(struct sockaddr *)&addr,sizeof(struct sockaddr_in))<0)
- {
- fprintf(stderr,"Bind Error:%s\n",strerror(errno));
- exit(1);
- }
-
- udps_respon(sockfd);
- close(sockfd);
- } </span>
udpclient.c
- <span style="font-family:SimSun;font-size:18px;">#include <stdlib.h>
- #include <stdio.h>
- #include <errno.h>
- #include <string.h>
- #include <unistd.h>
- #include <netdb.h>
- #include <sys/socket.h>
- #include <netinet/in.h>
- #include <sys/types.h>
- #include <arpa/inet.h>
-
- #define SERVER_PORT 8888
- #define MAX_BUF_SIZE 1024
-
- void udpc_requ(int sockfd,const struct sockaddr_in *addr,int len)
- {
- char buffer[MAX_BUF_SIZE];
- int n;
- while(1)
- {
- printf("Please input char:\n");
- fgets(buffer,MAX_BUF_SIZE,stdin);
- sendto(sockfd,buffer,strlen(buffer),0,addr,len);
- bzero(buffer,MAX_BUF_SIZE);
- }
- }
-
- int main(int argc,charchar **argv)
- {
- int sockfd;
- struct sockaddr_in addr;
-
- if(argc!=2)
- {
- fprintf(stderr,"Usage:%s server_ip\n",argv[0]);
- exit(1);
- }
-
-
- sockfd=socket(AF_INET,SOCK_DGRAM,0);
- if(sockfd<0)
- {
- fprintf(stderr,"Socket Error:%s\n",strerror(errno));
- exit(1);
- }
-
-
- bzero(&addr,sizeof(struct sockaddr_in));
- addr.sin_family=AF_INET;
- addr.sin_port=htons(SERVER_PORT);
- if(inet_aton(argv[1],&addr.sin_addr)<0)
- {
- fprintf(stderr,"Ip error:%s\n",strerror(errno));
- exit(1);
- }
-
- udpc_requ(sockfd,&addr,sizeof(struct sockaddr_in));
- close(sockfd);
- }</span>
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