implement opendisk(3), as discussed with Jason Thorpe
This commit is contained in:
lukem
parent
d65a5e7fd2
commit
1e372f6cf9
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@ -1,4 +1,4 @@
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/* $NetBSD: util.h,v 1.5 1997/07/24 08:47:48 phil Exp $ */
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/* $NetBSD: util.h,v 1.6 1997/09/25 05:04:02 lukem Exp $ */
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/*-
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* Copyright (c) 1995
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@ -63,6 +63,7 @@ int openpty __P((int *, int *, char *, struct termios *,
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pid_t forkpty __P((int *, char *, struct termios *, struct winsize *));
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int getmaxpartitions __P((void));
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int getrawpartition __P((void));
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int opendisk __P((const char *, int, char *, size_t, int));
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int ttyaction __P((char *tty, char *act, char *user));
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struct iovec;
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char *ttymsg __P((struct iovec *, int, const char *, int));
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@ -1,13 +1,13 @@
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# $NetBSD: Makefile,v 1.11 1997/06/29 18:45:24 christos Exp $
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# $NetBSD: Makefile,v 1.12 1997/09/25 04:53:30 lukem Exp $
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# @(#)Makefile 8.1 (Berkeley) 6/4/93
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LIB= util
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CFLAGS+=-DLIBC_SCCS -Wall -Wstrict-prototypes -Wmissing-prototypes
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SRCS= getmaxpartitions.c getrawpartition.c login.c login_tty.c logout.c \
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logwtmp.c passwd.c pty.c ttyaction.c ttymsg.c
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logwtmp.c opendisk.c passwd.c pty.c ttyaction.c ttymsg.c
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MAN= getmaxpartitions.3 getrawpartition.3 login.3 openpty.3 pw_init.3 \
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pw_lock.3 ttyaction.3 ttymsg.3
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MAN= getmaxpartitions.3 getrawpartition.3 login.3 opendisk.3 openpty.3 \
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pw_init.3 pw_lock.3 ttyaction.3 ttymsg.3
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MLINKS+=login.3 logout.3
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MLINKS+=login.3 logwtmp.3
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@ -0,0 +1,171 @@
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.\" $NetBSD: opendisk.3,v 1.1 1997/09/25 04:53:31 lukem Exp $
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.\"
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.\" Copyright (c) 1997 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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.\"
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.\" This code is derived from software contributed to The NetBSD Foundation
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.\" by Luke Mewburn.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the NetBSD
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.\" Foundation, Inc. and its contributors.
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.\" 4. Neither the name of The NetBSD Foundation nor the names of its
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.\" contributors may be used to endorse or promote products derived
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.\" from this software without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd September 22, 1997
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.Dt OPENDISK 3
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.Os NetBSD
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.Sh NAME
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.Nm opendisk
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.Nd open a disk's
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.Dq raw
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partition
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.Sh SYNOPSIS
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.Fd #include <util.h>
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.Ft int
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.Fo opendisk
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.Fa "const char *path"
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.Fa "int flags"
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.Fa "char *buf"
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.Fa "size_t buflen"
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.Fa "int iscooked"
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.Fc
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.Sh DESCRIPTION
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.Fn opendisk
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opens
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.Fa path ,
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for reading and/or writing as specified by the argument
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.Fa flags
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using
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.Xr open 2 ,
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and the file descriptor is returned to the caller.
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.Fa buf
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is used to store the resultant filename.
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.Fa buflen
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is the size, in bytes, of the array referenced by
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.Fa buf
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(usually
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.Dv MAXPATHLEN
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bytes).
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If
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.Fa iscooked
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is non zero, the
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.Dq cooked
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partition (block device) is opened, rather than the
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.Dq raw
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partition (character device).
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.Pp
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.Fn opendisk
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attempts to open the following variations of
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.Fa path ,
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in order:
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.Bl -tag -width "/dev/rpathX"
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.It Pa path
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The pathname as given.
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.It Pa path Ns Em X
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.Fa path
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with a suffix of
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.Sq Em X ,
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where
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.Sq Em X
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represents the raw partition of the device, as determined by
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.Xr getrawpartition 3 ,
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usually
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.Dq c .
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.El
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.Pp
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If
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.Fa iscooked
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is zero, then the following two variations are attempted:
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.Bl -tag -width "/dev/rpathX"
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.It Pa /dev/rpath
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.Fa path
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with a prefix of
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.Dq Pa /dev/r .
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.It Pa /dev/rpath Ns Em X
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.Fa path
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with a prefix of
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.Dq Pa /dev/r
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and a suffix of
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.Sq Em X
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(q.v.).
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.El
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.Pp
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Otherwise (i.e.,
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.Fa iscooked
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is non-zero), the following variations are attempted:
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.Bl -tag -width "/dev/rpathX"
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.It Pa /dev/path
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.Fa path
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with a prefix of
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.Dq Pa /dev/ .
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.It Pa /dev/path Ns Em X
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.Fa path
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with a prefix of
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.Dq Pa /dev/
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and a suffix of
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.Sq Em X
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(q.v.).
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.El
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.Sh RETURN VALUES
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An open file descriptor, or -1 if the
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.Xr open 2
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failed.
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.Sh ERRORS
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.Fn opendisk
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may set
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.Va errno
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to one of the following values:
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.Bl -tag -width Er
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.It Bq Er EINVAL
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.Dv O_CREAT
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was set in
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.Fa flags ,
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or
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.Xr getrawpartition 3
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didn't return a valid partition.
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.It Bq Er EFAULT
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.Fa buf
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was the
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.Dv NULL
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pointer.
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.El
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.Pp
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The
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.Fn opendisk
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function
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may also set
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.Va errno
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to any value specified by the
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.Xr open 2
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function.
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.Sh SEE ALSO
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.Xr open 2 ,
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.Xr getrawpartition 3
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.Sh HISTORY
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The
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.Fn opendisk
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function first appeared in
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.Nx 1.3 .
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@ -0,0 +1,100 @@
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/* $NetBSD: opendisk.c,v 1.1 1997/09/25 04:53:33 lukem Exp $ */
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/*-
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* Copyright (c) 1997 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Luke Mewburn.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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__RCSID("$NetBSD: opendisk.c,v 1.1 1997/09/25 04:53:33 lukem Exp $");
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#endif
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#include <sys/param.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <util.h>
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#include <paths.h>
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#include <stdio.h>
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#include <string.h>
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int
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opendisk(path, flags, buf, buflen, iscooked)
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const char *path;
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int flags;
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char *buf;
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size_t buflen;
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int iscooked;
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{
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int f, rawpart;
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if ((flags & O_CREAT) != 0) {
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errno = EINVAL;
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return (-1);
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}
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if (buf == NULL) {
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errno = EFAULT;
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return (-1);
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}
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rawpart = getrawpartition();
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if (rawpart < 0)
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return (-1); /* sysctl(3) in getrawpartition sets errno */
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snprintf(buf, buflen, "%s", path);
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f = open(buf, flags);
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if (f != -1 || errno != ENOENT)
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return (f);
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snprintf(buf, buflen, "%s%c", path, 'a' + rawpart);
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f = open(buf, flags);
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if (f != -1 || errno != ENOENT)
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return (f);
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if (strchr(path, '/') != NULL)
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return (-1);
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snprintf(buf, buflen, "%s%s%s", _PATH_DEV, iscooked ? "" : "r", path);
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f = open(buf, flags);
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if (f != -1 || errno != ENOENT)
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return (f);
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snprintf(buf, buflen, "%s%s%s%c", _PATH_DEV, iscooked ? "" : "r", path,
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'a' + rawpart);
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f = open(buf, flags);
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return (f);
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}
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@ -1,2 +1,2 @@
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major=4
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minor=0
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minor=1
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