source: MondoRescue/branches/2.2.5/mindi-busybox/libbb/device_open.c

/* vi: set sw=4 ts=4: */
/*
 * Utility routines.
 *
 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
 *
 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
 */

#include "libbb.h"

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

    m = mode | O_NONBLOCK;

    /* Retry up to 5 times */
    /* TODO: explain why it can't be considered insane */
    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;
}