这篇文章主要介绍了vxworks中如何实现BroadCast，具有一定借鉴价值，感兴趣的朋友可以参考下，希望大家阅读完这篇文章之后大有收获，下面让小编带着大家一起了解一下。
有了单播和组播，广播也跑不了。广播，BroadCast，与单播的区别就是地址不同。广播用的地址是255.255.255.255；而且广播数据不会被路由器转发，限定于局域网内，否则就是网络风暴了
广播的代码其实更简单，直接参考单播/组播的例子写一个
Server是在单播的基础上略加改动
调用socket()打开一个Socket
调用bind()指定Port信息
调用setsockopt()加入广播
调用recvfrom()阻塞接收
最后，调用close()关闭Socket
广播Client更简单了
调用socket()打开一个Socket
指定广播地址和Port信息
调用sendto()发送数据
最后，调用close()关闭Socket
完整代码如下
#include <stdio.h> /* pritnf() */#include <stdLib.h> /* malloc() */#include <sockLib.h> /* socket() */#include <inetLib.h> /* struct sockaddr_in */
#define HOST_PORT 60000#define MIN_SIZE 10#define MIN_TIMES 10
void broadServer (int port, int size, int times){ struct sockaddr_in localAddr; struct sockaddr_in peerAddr; int addrSize = sizeof(struct sockaddr); int opt = 1; int fd; int num; char *buffer; if(port <= 2000) port = HOST_PORT; if(size <= 0) size = MIN_SIZE; if(times <= 0) times = MIN_TIMES; printf (">, size, port); /* 打开Socket */ fd = socket (AF_INET, SOCK_DGRAM, 0); /* 指定本地地址信息 */ localAddr.sin_family = AF_INET; localAddr.sin_port = htons (port); localAddr.sin_addr.s_addr = INADDR_ANY; bind (fd, (struct sockaddr *)&localAddr, sizeof(struct sockaddr));
/* 加入广播 */ setsockopt(fd, SOL_SOCKET, SO_BROADCAST, (char *)&opt, sizeof(int));
buffer = (char *)malloc (size); while ((times--)>0) { /* 接收广播数据 */ num = recvfrom (fd, buffer, size, 0, (struct sockaddr *)&peerAddr, &addrSize); if (num < 0) break; printf (" broadServer: recv %d chars from %s\n", num, inet_ntoa(peerAddr.sin_addr)); }
/* 关闭Socket */ close (fd); free (buffer); printf (" broadServer: end\n"); }
#include <stdio.h> /* pritnf() */#include <stdLib.h> /* malloc() */#include <sockLib.h> /* socket() */#include <inetLib.h> /* struct sockaddr_in */
#define HOST_PORT 60000#define MIN_SIZE 1#define MIN_TIMES 1
void broadClient (int port, int size, int times){ struct sockaddr_in serverAddr; int opt = 1; int fd; char *buffer; int num; if(port <= 2000) port = HOST_PORT; if(size <= 0) size = MIN_SIZE; if(times<= 0) times= MIN_TIMES; buffer = (char *)malloc(size); for(num=0; num<size; num++) buffer[num] = (num%26)+'a';
/* 服务器地址信息 */ serverAddr.sin_family = AF_INET; serverAddr.sin_port = htons (port); serverAddr.sin_addr.s_addr = htonl(INADDR_BROADCAST); printf (" broadClient: try to send %d chars %d times to %s:%d\n", size, times, inet_ntoa(serverAddr.sin_addr), port);
/* 打开Socket */ fd = socket (AF_INET, SOCK_DGRAM, 0);
while ((times--)>0) { /* 发送数据到BroadCast Server */ num = sendto(fd, buffer, size, 0, (struct sockaddr *)&serverAddr, sizeof(struct sockaddr)); printf (" broadClient: send %d chars\n", num); }
/* 关闭Socket */ close (fd); free (buffer); printf (" broadClient: send finished\n"); }
运行情况如下如下
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