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

#include <stdio.h>

int main(int argc, char **argv)
{
	int flags;
	int mode;
	int fd, laterfd;
	int count;
	struct flock aflock;
	char aBuffer[1024];

	mode = S_IRUSR | S_IRGRP | S_IROTH;
	mode |= S_IWUSR | S_IWGRP | S_IWOTH;
	flags = O_RDWR;

	aflock.l_type = 0;
	aflock.l_whence = SEEK_SET;
	aflock.l_start = 0;
	aflock.l_len = 0;

	aflock.l_type = F_WRLCK;

	fd = open( argv[1], flags, mode );

	if (!strcmp(argv[2], "lock"))
		fcntl( fd, F_SETLK, &aflock );

	mode = S_IRUSR | S_IRGRP | S_IROTH;
	flags = O_RDONLY;

	laterfd = open( argv[1], flags, mode );

	count = read(laterfd, aBuffer, 1024);
	if (count == -1)
		perror("problem");
	printf("count is %d\n", count);

	return 0;
}