1/* vi: set sw=4 ts=4: */
2/*
3 * Utility routines.
4 *
5 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
6 *
7 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
8 */
9
10#include "libbb.h"
11
12/* try to open up the specified device */
13int device_open(const char *device, int mode)
14{
15	int m, f, fd = -1;
16
17	m = mode | O_NONBLOCK;
18
19	/* Retry up to 5 times */
20	/* TODO: explain why it can't be considered insane */
21	for (f = 0; f < 5; f++)
22		if ((fd = open(device, m, 0600)) >= 0)
23			break;
24	if (fd < 0)
25		return fd;
26	/* Reset original flags. */
27	if (m != mode)
28		fcntl(fd, F_SETFL, mode);
29	return fd;
30}
31