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UDP编程之二

2024-07-08 11:18:45   228人阅读

广播模型

broadcast.c

 1 #include <apue.h> 2  3 #define PORT 8088 4  5 int main(int argc,char **argv) 6 { 7     if(argc!=2) 8     { 9         printf("%s <msg>\n",argv[0]);10         exit(0);11     }12 13     int sockfd;14     if((sockfd = socket(AF_INET,SOCK_DGRAM,0))<0)15         ERR("socket failed");16     17     //设置允许广播18     int val = 1;19     if(setsockopt(sockfd,SOL_SOCKET,SO_BROADCAST,&val,sizeof(val))<0)20         ERR("setsockopt failed");21 22     struct sockaddr_in peer;23     CLEAR(peer);24     peer.sin_family = AF_INET;25     peer.sin_port = htons(PORT);26     inet_pton(AF_INET,"192.168.5.255",&peer.sin_addr);27 28     if(sendto(sockfd,argv[1],strlen(argv[1]),0,(struct sockaddr*)&peer,sizeof(peer))<0)29         ERR("send failed");30     31     close(sockfd);32     return 0;33 }

recv.c

#include <apue.h>#define PORT 8088int main(int argc,char **argv){    int sockfd;    if((sockfd = socket(AF_INET,SOCK_DGRAM,0))<0)        ERR("socket failed");        struct sockaddr_in ipv4;    CLEAR(ipv4);    ipv4.sin_family = AF_INET;    ipv4.sin_port = htons(PORT);    ipv4.sin_addr.s_addr = htonl(INADDR_ANY);    if(bind(sockfd,(struct sockaddr*)&ipv4,sizeof(ipv4))<0)        ERR("bind failed");    int n;    char buf[255];    while(1)    {        if((n = recvfrom(sockfd,buf,sizeof(buf),0,NULL,NULL))<0)            ERR("recv failed");        buf[n] = 0;        printf("%s\n",buf);    }    close(sockfd);    return 0;}

 


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