Function exportFile

src/test/examples/testlo.c:149–190

* exportFile - * export large object "lobjOid" to file "out_filename" * */

 *
 */
static void
exportFile(PGconn *conn, Oid lobjId, char *filename)
{
	int			lobj_fd;
	char		buf[BUFSIZE];
	int			nbytes,
				tmp;
	int			fd;

	/*
	 * open the large object
	 */
	lobj_fd = lo_open(conn, lobjId, INV_READ);
	if (lobj_fd < 0)
		fprintf(stderr, "cannot open large object %u", lobjId);

	/*
	 * open the file to be written to
	 */
	fd = open(filename, O_CREAT | O_WRONLY | O_TRUNC, 0666);
	if (fd < 0)
	{							/* error */
		fprintf(stderr, "cannot open unix file\"%s\"",
				filename);
	}

	/*
	 * read in from the inversion file and write to the Unix file
	 */
	while ((nbytes = lo_read(conn, lobj_fd, buf, BUFSIZE)) > 0)
	{
		tmp = write(fd, buf, nbytes);
		if (tmp < nbytes)
		{
			fprintf(stderr, "error while writing \"%s\"",
					filename);
		}
	}

	lo_close(conn, lobj_fd);
	close(fd);
}

static void
exit_nicely(PGconn *conn)