unpv13e/udpcliserv/udpcli05.c

#include	"unp.h"

int
main(int argc, char **argv)
{
	int					sockfd;
	struct sockaddr_in	servaddr;

	if (argc != 2)
		err_quit("usage: udpcli <IPaddress>");

	bzero(&servaddr, sizeof(servaddr));
	servaddr.sin_family = AF_INET;
	servaddr.sin_port = htons(SERV_PORT);
	Inet_pton(AF_INET, argv[1], &servaddr.sin_addr);

	sockfd = Socket(AF_INET, SOCK_DGRAM, 0);

	bzero(&cliaddr, sizeof(cliaddr));
	cliaddr.sin_family = AF_INET;
	cliaddr.sin_addr.s_addr = htonl(INADDR_ANY);
	cliaddr.sin_port = htons(0); /* force assignment of ephemeral port */
	Bind(sockfd, (SA *) &cliaddr, sizeof(cliaddr));

	dg_cli(stdin, sockfd, (SA *) &servaddr, sizeof(servaddr));

	exit(0);
}