listener.c,v

这是P2P流媒体方案－NICE的实现源码

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1.1
date	2002.07.02.19.29.52;	author rbraud;	state Exp;
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1.1
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@Initial revision
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@/*
** listener.c -- a datagram sockets "server" demo
*/

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <strings.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <unistd.h>


#define MAXBUFLEN 100

int main(int argc , char * argv[])
{
    int sockfd;
    struct sockaddr_in my_addr;    /* my address information */
    struct sockaddr_in their_addr; /* connector's address information */
    int addr_len, numbytes;
    char buf[MAXBUFLEN];
    int MYPORT;
    if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) == -1) {
        perror("socket");
        exit(1);
    }
    if(argc!=2)
    {
	printf("format listener <port>\n");
	exit(1);
    }

    MYPORT=atoi(argv[1]);
    my_addr.sin_family = AF_INET;         /* host byte order */
    my_addr.sin_port = htons(MYPORT);     /* short, network byte order */
    my_addr.sin_addr.s_addr = INADDR_ANY; /* automatically fill with my IP */
    bzero(&(my_addr.sin_zero), 8);        /* zero the rest of the struct */

    if (bind(sockfd, (struct sockaddr *)&my_addr, sizeof(struct sockaddr)) == -1) {
        perror("bind");
        exit(1);
    }

while(1)
{
    addr_len = sizeof(struct sockaddr);
    if ((numbytes=recvfrom(sockfd,buf,MAXBUFLEN,0,(struct sockaddr *)&their_addr,
                           (socklen_t*)&addr_len)) == -1) {
        perror("recvfrom");
	numbytes = 0;
    }

    buf[numbytes] = '\0';
    sendto(sockfd,buf,MAXBUFLEN,0,(struct sockaddr *)&their_addr,addr_len);
}
close(sockfd);
}
@