Linux下UDP收/发广播消息简单实现

发送广播消息

 1 #include<stdio.h>
 2 #include<stdlib.h>
 3 #include<string.h>
 4 #include<sys/types.h>
 5 #include<sys/socket.h>
 6 #include<sys/wait.h>
 7 #include<netinet/in.h>
 8 #include<arpa/inet.h>
 9 #include <errno.h>
10 
11 int main(void)
12 {
13     char rgMessage[128] = "I am sending message to you!";
14     int iFd;
15     int iSendbytes;
16     int iOptval = 1;
17     struct sockaddr_in Addr;
18     if ((iFd = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
19     {
20         printf("socket fail\n");
21         return -1;
22     }
23     
24     if (setsockopt(iFd, SOL_SOCKET, SO_BROADCAST | SO_REUSEADDR, &iOptval, sizeof(int)) < 0)
25     {
26         printf("setsockopt failed!");
27     }
28     memset(&Addr, 0, sizeof(struct sockaddr_in));
29     Addr.sin_family = AF_INET;
30     Addr.sin_addr.s_addr = inet_addr("255.255.255.255");
31     Addr.sin_port = htons(8899);
32 
33     while (1)
34     {
35         if ((iSendbytes = sendto(iFd, rgMessage, strlen(rgMessage), 0, (struct sockaddr*)&Addr, sizeof(struct sockaddr))) == -1)
36         {
37             printf("sendto fail, errno=%d\n", errno);
38             return -1;
39         }
40         printf("rgMessage=%s, rgMessageLen=%d,iSendbytes=%d\n", rgMessage, strlen(rgMessage), iSendbytes);
41         sleep(1);        
42     }
43     close(iFd);
44 
45     return 0;
46 }

 

接收广播消息

 1 #include <stdio.h>  
 2 #include <stdlib.h>   
 3 #include <string.h>  
 4 #include <sys/socket.h>  
 5 #include <netinet/in.h>  
 6 #include <arpa/inet.h>  
 7 #include <netdb.h>  
 8    
 9 int main(void) {  
10   
11     int iAddrLength;  
12     char rgMessage[2014]; 
13     int iOptval = 1;     
14     int iFd;  
15     struct sockaddr_in Addr;  
16 
17     if ((iFd = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
18     {
19         printf("socket fail\n");
20         return -1;
21     }   
22   
23     if (setsockopt(iFd, SOL_SOCKET, SO_REUSEADDR, &iOptval, sizeof(int)) < 0)
24     {
25         printf("setsockopt failed!\n");
26     }
27     memset(&Addr, 0, sizeof(struct sockaddr_in));  
28     Addr.sin_family = AF_INET;  
29     Addr.sin_addr.s_addr = INADDR_ANY;
30     Addr.sin_port = htons(8899);  
31     iAddrLength = sizeof(Addr);  
32     
33     if (bind(iFd, (struct sockaddr *)&Addr, sizeof(Addr)) == -1)
34     {
35         printf("bind failed!\n");
36     }        
37       
38     while (1)  
39     {  
40         if (recvfrom(iFd, rgMessage, sizeof(rgMessage), 0, (struct sockaddr *)&Addr, &iAddrLength) == -1)
41         {
42             printf("recv failed!\n");
43         }            
44         printf("recv:%s\n", rgMessage);   
45     }  
46   
47     close(iFd);   
48   
49     return 0;  
50 }

 

posted @ 2016-05-27 16:55  xiemingwang  阅读(5074)  评论(0)  编辑  收藏  举报