#ifdef __WIN32__#include <winsock.h>#define socklen_t int#else /* __WIN32__ */#include <sys/types.h>#include <sys/socket.h>#include <netinet/in.h>#include <arpa/inet.h>#include <netdb.h>#define min(a,b) (((a)<(b))?(a):(b))#include <errno.h>#endif /* __WIN32__ */#include <stdio.h>#include <pthread.h>#include <net.h>/* Callback function, executed by a separate thread   started by startUDPIO(&ul) */void dgramrecvd(UDPIO *pul) {	pul->buf[pul->nrecv] = 0;	printf("from fd %d received %d characters\n", pul->fd, pul->nrecv);	printf("the sender's address/port was ");	/* printf("%s:%d\n", pul->remoteip, pul->remoteport); */	printf("%s:%d\n", htoa(pul->remoteip), pul->remoteport);	printf("buffer: <%s>\n", pul->buf);}int main(int ac, char *av[]) {	unsigned long int ip;	int port;	int status;	unsigned char buf[48]; /* ###### temp, for test ###### */	UDPIO ul;	if(ac <= 2) {		printf("usage: %s localaddress localport\n", av[0]);		exit(-1);	}#ifdef __WIN32__	{#define	sleep(n) Sleep(1000*(n))		int status;		WSADATA wsaData;		status = WSAStartup(MAKEWORD(1, 1), &wsaData);		if(status) {			printf("WSAStartup returned %d: error %d - aborting...", status, WSAGetLastError());			return -1;		}	}#endif	/* status = domain2ip(av[1], ip);	if(status != 0) {		printf("couldn't resolve %s: exiting.\n", av[1]);		exit(1);	} else {		printf("%s resolved as %s\n", av[1], ip);	} */	ip = domain2hip(av[1]);	port = atoi(av[2]);	ul.buf = buf;	ul.bufsize = sizeof(buf);	/* strncpy(ul.localip, ip, sizeof(ul.localip)-1);	ul.localip[sizeof(ul.localip)-1] = 0; */	ul.localip = ip;	ul.localport = port;	ul.callback = dgramrecvd;	status = startUDPIO(&ul);	if(status) {#ifdef __WIN32__		printf("startUDPIO() failed returning %s", WSAGetLastErrorMessage(WSAGetLastError()));#else		printf("startUDPIO() failed returning %s", strerror(errno));#endif		exit(1);	}	printf("Waiting for remote to contact us..."); fflush(stdout);	/* while(ul.remoteip[0] == 0) */	while(ul.remoteip == 0)		sleep(1);	/* printf("\nGot call from %s:%d\n", ul.remoteip, ul.remoteport); */	printf("\nGot call from %s:%d\n", htoa(ul.remoteip), ul.remoteport);	while(1)	{		char line[512];		char *p;		/* printf("Send to %s:%d>", ul.remoteip, ul.remoteport); */		printf("Send to %s:%d>", htoa(ul.remoteip), ul.remoteport);		if(fgets(line, sizeof(line) -1, stdin) != NULL) {			if((p = strrchr(line, '\n')) != NULL) *p = 0;			if((p = strrchr(line, '\r')) != NULL) *p = 0;			if(*line == 0)				continue; /* ignore empty lines */			if(UDPsend(&ul, (unsigned char *)line, strlen(line), ul.remoteip, ul.remoteport) < 0)				break;		} else {			status = stopUDPIO(&ul);			if(status) {#ifdef __WIN32__				printf("stopUDPIO() failed returning %s\n", WSAGetLastErrorMessage(WSAGetLastError()));#else				printf("stopUDPIO() failed returning %s\n", strerror(errno));#endif				exit(1);			}			goto exit;		}	}	printf("error! UDPsend returned a value < 0");	return 1;exit:	sleep(1);#ifdef __WIN32__	{		int status;		status = WSACleanup();		if(status) {			printf("WSACleanup returned %d: error %d - aborting...", status, WSAGetLastError());			return -1;		}	}#endif	printf("Normal exit.\n");	return 0;}