#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdio.h>

const size_t BUFF_SIZE = 1024;

int main(int argc, char* argv[]) {
	int fd_in = 0;

	int fd_outs[BUFF_SIZE];
	fd_outs[0] = 1; // stdout
	for (int i = 1; i < argc; i++) {
		fd_outs[i] = open(argv[i], O_WRONLY | O_TRUNC | O_CREAT, 0766);
	}

	char buf[BUFF_SIZE];
	int actual = read(fd_in, buf, BUFF_SIZE);
	while (actual > 0) {
		for (int i = 0; i < argc; i++) {
			write(fd_outs[i], buf, actual);
		}
		actual = read(fd_in, buf, BUFF_SIZE);
	}
	return 0;
}