minix/lib/libutil/opendisk.c
David van Moolenbroek de27460e2e libutil: let opendisk(3) try /dev
If a device node is given without path, and opening the node fails
initially, prepend "/dev/" to the node name and try opening again.
This is more in line with NetBSD behavior.

Change-Id: Ib544aec52abe43132510f0e4b173b00fb3dbaab8
2014-02-19 11:22:19 +01:00

122 lines
3.3 KiB
C

/* $NetBSD: opendisk.c,v 1.12 2009/10/13 22:00:31 pooka Exp $ */
/*-
* Copyright (c) 1997 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Luke Mewburn.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
__RCSID("$NetBSD: opendisk.c,v 1.12 2009/10/13 22:00:31 pooka Exp $");
#endif
#include <sys/param.h>
#include <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <util.h>
#include <paths.h>
#include <stdio.h>
#include <string.h>
static int
__opendisk(const char *path, int flags, char *buf, size_t buflen, int iscooked,
int (*ofn)(const char *, int, ...))
{
#ifndef __minix
int f, rawpart;
#else
int f;
#endif
#ifdef __minix
/*
* MINIX does not have the cooked/raw distinction. Do not prepend 'r'
* to the device name when generating a full path.
*/
iscooked = 1;
#endif
if (buf == NULL) {
errno = EFAULT;
return (-1);
}
snprintf(buf, buflen, "%s", path);
if ((flags & O_CREAT) != 0) {
errno = EINVAL;
return (-1);
}
#ifndef __minix
rawpart = getrawpartition();
if (rawpart < 0)
return (-1); /* sysctl(3) in getrawpartition sets errno */
#endif
f = ofn(buf, flags, 0);
if (f != -1 || errno != ENOENT)
return (f);
#ifndef __minix
snprintf(buf, buflen, "%s%c", path, 'a' + rawpart);
f = ofn(buf, flags, 0);
if (f != -1 || errno != ENOENT)
return (f);
#endif
if (strchr(path, '/') != NULL)
return (-1);
snprintf(buf, buflen, "%s%s%s", _PATH_DEV, iscooked ? "" : "r", path);
f = ofn(buf, flags, 0);
if (f != -1 || errno != ENOENT)
return (f);
#ifndef __minix
snprintf(buf, buflen, "%s%s%s%c", _PATH_DEV, iscooked ? "" : "r", path,
'a' + rawpart);
f = ofn(buf, flags, 0);
#endif
return (f);
}
int
opendisk(const char *path, int flags, char *buf, size_t buflen, int iscooked)
{
return __opendisk(path, flags, buf, buflen, iscooked, open);
}
int
opendisk1(const char *path, int flags, char *buf, size_t buflen, int iscooked,
int (*ofn)(const char *, int, ...))
{
return __opendisk(path, flags, buf, buflen, iscooked, ofn);
}