#include        <unistd.h>
#include	<errno.h>
#include	<stdio.h>
#include	<fcntl.h>
#include	<stdlib.h>

#define	usage()	\
	printf("Usage: %s [-F filename] [-S size] \n",argv[0]); \
	exit(1);



extern int optind;
extern int optopt;
extern int opterr;
extern char *optarg;


int main(int argc, char **argv)
{
int 	opt;
ulong 	size;
char 	*filename;
int	fd, i; 

	while ((opt = getopt(argc, argv, "F:S:")) != EOF)
	{
		switch (opt)
		{
		case 'F':	/* filename */
			filename = optarg;
		case 'S':	/* size */
			size = atol(optarg);
			break;
		default:
			usage();
			break;
		}
	}
	if ((fd = open(filename, O_CREAT | O_RDWR, 0700)) != -1 )
    	{
        	for (i=0; i<(size/10); i++)
		{
			write(fd, "0123456789", 10);
		}
		for (i=0; i<(size%10); i++)
		{
			write(fd, "1", 1);
		}
		fsync(fd);
		close(fd);
    	}
    	else
    	{
		perror("open failed");
		return(-1);
    	}
}