busybox/libbb/device_open.c

/* vi: set sw=4 ts=4: */
/*
 * Utility routines.
 *
 * Copyright (C) 1999,2000,2001 by Erik Andersen <andersee@debian.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#include <stdio.h>
#include <fcntl.h>
#include "libbb.h"


/* try to open up the specified device */
extern int device_open(const char *device, int mode)
{
	int m, f, fd = -1;

	m = mode | O_NONBLOCK;

	/* Retry up to 5 times */
	for (f = 0; f < 5; f++)
		if ((fd = open(device, m, 0600)) >= 0)
			break;
	if (fd < 0)
		return fd;
	/* Reset original flags. */
	if (m != mode)
		fcntl(fd, F_SETFL, mode);
	return fd;
}

/* END CODE */
/*
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*/