#include <stdio.h>
#include <fcntl.h>
#include <sys/errno.h>

main()
{
	int n, w, t = 0;
	char	buf[65536];
	setmode(0, O_BINARY);
	setmode(1, O_BINARY);
	while ((n=read(0, buf, sizeof(buf))) > 0) {
		w=write(1, buf, n);
		if (w != n && w >= 0) {
			fprintf(stderr,
				"Woops! @%d: Wrote returned %d, expected to write %d, errno %d. 
Retrying!\n",
				t, w, n, errno);
			w=write(1, buf, n);
			if (w != n && w >= 0) {
				fprintf(stderr,
					"Ouch! @ %d: Wrote returned %d, expected to write %d, errno %d\n",
					t, w, n, errno);
			}
		}
		if (w < 0) {
			perror("write");
			exit(1);
		}
		t += w;
	}
	if (n<0) {
		perror("read");
		exit(1);
	}
	return 0;
}