/* Create two loopback address sockets connected to each other, shutdown the
   first socket for writing, send a datagram from the second socket to the first
   socket, and then test the poll bits on the first socket. */

#include "udp.h"

int main(void)
{
	int fd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
	if ( fd < 0 )
		err(1, "first socket");
	struct sockaddr_in sin;
	memset(&sin, 0, sizeof(sin));
	sin.sin_family = AF_INET;
	sin.sin_addr.s_addr = htobe32(INADDR_LOOPBACK);
	sin.sin_port = htobe16(0);
	if ( bind(fd, (const struct sockaddr*) &sin, sizeof(sin)) < 0 )
		err(1, "first bind");
	struct sockaddr_in local;
	socklen_t locallen = sizeof(local);
	if ( getsockname(fd, (struct sockaddr*) &local, &locallen) < 0 )
		err(1, "first getsockname");
	int fd2 = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
	if ( fd2 < 0 )
		err(1, "second socket");
	if ( bind(fd2, (const struct sockaddr*) &sin, sizeof(sin)) < 0 )
		err(1, "second bind");
	struct sockaddr_in local2;
	socklen_t locallen2 = sizeof(local2);
	if ( getsockname(fd2, (struct sockaddr*) &local2, &locallen2) < 0 )
		err(1, "second getsockname");
	if ( connect(fd, (const struct sockaddr*) &local2, locallen2) < 0 )
		err(1, "first connect");
	if ( connect(fd2, (const struct sockaddr*) &local, locallen) < 0 )
		err(1, "second connect");
	if ( shutdown(fd, SHUT_WR) < 0 )
		err(1, "shutdown");
	char x = 'x';
	if ( send(fd2, &x, sizeof(x), 0) < 0 )
		err(1, "send");
	usleep(50000);
	struct pollfd pfd;
	memset(&pfd, 0, sizeof(pfd));
	pfd.fd = fd;
	pfd.events = POLLIN | POLLOUT;
	int num_events = poll(&pfd, 1, 0);
	if ( num_events < 0 )
		err(1, "poll");
	if ( num_events == 0 )
		errx(1, "poll returned 0");
	printf("0");
	if ( pfd.revents & POLLIN )
		printf(" | POLLIN");
	if ( pfd.revents & POLLPRI )
		printf(" | POLLPRI");
	if ( pfd.revents & POLLOUT )
		printf(" | POLLOUT");
#if defined(POLLRDHUP) && POLLRDHUP != POLLHUP
	if ( pfd.revents & POLLRDHUP )
		printf(" | POLLRDHUP");
#endif
	if ( pfd.revents & POLLERR )
		printf(" | POLLERR");
	if ( pfd.revents & POLLHUP )
		printf(" | POLLHUP");
#if POLLRDNORM != POLLIN
	if ( pfd.revents & POLLRDNORM )
		printf(" | POLLRDNORM");
#endif
#if POLLRDBAND != POLLPRI
	if ( pfd.revents & POLLRDBAND )
		printf(" | POLLRDBAND");
#endif
#if POLLWRNORM != POLLOUT
	if ( pfd.revents & POLLWRNORM )
		printf(" | POLLWRNORM");
#endif
#if POLLWRBAND != POLLOUT
	if ( pfd.revents & POLLWRBAND )
		printf(" | POLLWRBAND");
#endif
	putchar('\n');
	return 0;
}
