Linux下的廣播程式

        最近需要用到網路編程中的廣播程式，在網上找了下，親測可用。

用戶端：

 1 #include <stdio.h> 2 #include <arpa/inet.h> 3 #include <string.h> 4 #include <sys/ioctl.h> 5 #include <net/if.h> 6 #include <unistd.h> 7  8  9 int main(void)10 {11     struct sockaddr_in all;12     int fd;13     //廣播訊息14     char buff[]="this is a broadcast message";15     int so_boradcast=1;16 17     //IPv4 UDP18     fd=socket(AF_INET,SOCK_DGRAM,0);19     //廣播位址，用ifconfig查看得到20     all.sin_addr.s_addr=inet_addr("192.168.1.255");21     all.sin_family=AF_INET;22     //連接埠號碼23     all.sin_port=htons(8888);24     //設定socket為廣播25     setsockopt(fd,SOL_SOCKET,SO_BROADCAST,&so_boradcast,sizeof(so_boradcast));26 27     while(1)28     {29         //廣播30         sendto(fd,buff,strlen(buff),0,(struct sockaddr *)&all,sizeof(all));31         //延時1秒32         sleep(1);33     }34     return 0;35 }

伺服器端：

 1 #include <stdio.h> 2 #include <arpa/inet.h> 3 #include <stdlib.h> 4 #include <unistd.h> 5  6 int main(int argc,char *argv[]) 7 { 8     int fd; 9     struct sockaddr_in server;10     struct sockaddr_in client;11     int status;12 13     //IPv4 UDP14     fd=socket(AF_INET,SOCK_DGRAM,0);15     //連接埠號碼16     server.sin_port=htons(8888);17     server.sin_addr.s_addr=INADDR_ANY;18     server.sin_family=AF_INET;19 20     //綁定地址21     status=bind(fd,(struct sockaddr *)&server,sizeof(struct sockaddr));22     if(status<0)23     {24         printf(" bind() error\n");25         exit(1);26     }27     //接收Buffer28     char buff[1024];29     socklen_t len=sizeof(struct sockaddr);30 31     while(1)32     {33         //接收34         recvfrom(fd,buff,1024,0,(struct sockaddr *)&client,&len);35         //列印接收到的資訊36         printf("%s\n",buff);37     }38 39     return 0;40 }