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

int main(int argc, const char* argv[])
{
	int i;
	for (i = 1; i < argc; i++) {
		int fd, len, ret;
		struct stat statbuf;
		fd = open(argv[i], O_CREAT|O_TRUNC|O_WRONLY, 0666);
		if (fd == -1) {
			fprintf(stderr, "%s: open: %s\n", argv[i], strerror(errno));
			continue;
		}
		len = write(fd, "Hello world\n", 12);
		if (len != 12) {
			fprintf(stderr, "%s: write: %s\n", argv[i], strerror(errno));
			close(fd);
			continue;
		}
		
		ret = fstat(fd, &statbuf);
		if (ret != 0) {
			fprintf(stderr, "%s: fstat: %s\n", argv[i], strerror(errno));
			close(fd);
			continue;
		}

		printf("%s: fstat: st_size=%lld\n", argv[i], (long long)statbuf.st_size);

		ret = close(fd);
		if (ret != 0) {
			fprintf(stderr, "%s: close: %s\n", argv[i], strerror(errno));
		}

		ret = stat(argv[i], &statbuf);
		if (ret != 0) {
			fprintf(stderr, "%s: stat: %s\n", argv[i], strerror(errno));
			continue;
		}
		printf("%s: stat: st_size=%lld\n", argv[i], (long long)statbuf.st_size);
	}
}