#include <err.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <sys/select.h>

#define MAXBUF 2048

fd_set rfds0, rfds1;
struct timeval timeout;

int
main()
{
	char buf[MAXBUF];
	FILE *in, *out;
	int c, i, n, ofd, state;

	if(!(in = fopen("/var/tmp/r.in", "w")))
		err(1, "fopen");
	if(!(out = fopen("/var/tmp/r.out", "r")))
		err(1, "fopen");
	ofd = fileno(out);

	FD_ZERO(&rfds0);
	FD_SET(0, &rfds0);

	FD_ZERO(&rfds1);
	FD_SET(ofd, &rfds1);

	timeout.tv_sec = 1;
	timeout.tv_usec = 0;

	for(state = 0; printf("."); state = !state)
		switch(state){
		case 0:
			if(!select(0+1, &rfds0, NULL, NULL, &timeout))
				break;
			printf("0 ready\n");
			break;
		case 1:
			if(!select(ofd+1, &rfds1, NULL, NULL, &timeout))
				break;
			printf("1 ready\n");
			break;
		}

#if 0
	for(;;){
		printf(".");
		FD_ZERO(&read_set);
		FD_SET(0, &read_set);
		FD_SET(ofd, &read_set);
		switch(select(ofd+1, &read_set, NULL, NULL, &timeout)){
		case -1:
			err(1, "select");
			break;
		case 0:
			break;
		default:
			if(FD_ISSET(0, &read_set)){
				fgets(buf, MAXBUF, stdin);
				buf[strcspn(buf, "\n")] = 0;
				printf("in: %s\n", buf);
			}else if(FD_ISSET(ofd, &read_set)){
				fgets(buf, MAXBUF, stdin);
				buf[strcspn(buf, "\n")] = 0;
				printf("out: %s\n", buf);
			}else{
				printf("?\n");
			}
		}
	}
#endif

}