/*                           readmouse.c                       */

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

int main(void)
{

	unsigned char buf[64];
	int fd, nread;
	
	fd = open("/dev/psaux", O_RDONLY,0);
	if (fd < 0) {
		printf("can't open file /dev/psaux\n");
		return 1;
		}
        nread=0;
	do {
	  nread += read(fd, buf+nread, 1);
	  printf("0x%x ",buf[nread-1]);
	  fflush(stdout);
	} while (nread < 20);
	printf("\n");
	close(fd);	
	return 0;
}


=========================================================================================

/*                           copyfile.c                       */

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

int main(int argc, char **argv)
{

	unsigned char buf[4096];
	int fd1, fd2, nread;
	
	if (argc != 3) {
		printf("wrong number of parameters\n");
		return -1;
		}
	else  {
		fd1 = open(argv[1], O_RDONLY);
		if (fd1 < 0) {
			printf("can't find file: %s\n", argv[1]);
			return 1;
			}
		fd2 = open(argv[2], O_WRONLY|O_CREAT|O_TRUNC, 0600);
		if (fd2 < 0) {
			printf("can't open file: %s\n", argv[2]);
			return 1;
			}
		do {
			nread = read(fd1, buf, 4096);
			write(fd2, buf, nread);
			} while (nread);
		close(fd1);
		close(fd2);	
		return 0;
		}
}