2fe8fb192f
There is important information about booting non-ack images in docs/UPDATING. ack/aout-format images can't be built any more, and booting clang/ELF-format ones is a little different. Updating to the new boot monitor is recommended. Changes in this commit: . drop boot monitor -> allowing dropping ack support . facility to copy ELF boot files to /boot so that old boot monitor can still boot fairly easily, see UPDATING . no more ack-format libraries -> single-case libraries . some cleanup of OBJECT_FMT, COMPILER_TYPE, etc cases . drop several ack toolchain commands, but not all support commands (e.g. aal is gone but acksize is not yet). . a few libc files moved to netbsd libc dir . new /bin/date as minix date used code in libc/ . test compile fix . harmonize includes . /usr/lib is no longer special: without ack, /usr/lib plays no kind of special bootstrapping role any more and bootstrapping is done exclusively through packages, so releases depend even less on the state of the machine making them now. . rename nbsd_lib* to lib* . reduce mtree
152 lines
4.7 KiB
Groff
152 lines
4.7 KiB
Groff
.\" $NetBSD: chroot.2,v 1.23 2010/05/31 12:16:20 njoly Exp $
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.\"
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.\" Copyright (c) 1983, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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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. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)chroot.2 8.1 (Berkeley) 6/4/93
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.\"
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.Dd April 18, 2001
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.Dt CHROOT 2
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.Os
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.Sh NAME
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.Nm chroot
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.Nd change root directory
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In unistd.h
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.Ft int
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.Fn chroot "const char *dirname"
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.Ft int
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.Fn fchroot "int fd"
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.Sh DESCRIPTION
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.Fa dirname
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is the address of the pathname of a directory, terminated by an ASCII NUL.
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.Fn chroot
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causes
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.Fa dirname
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to become the root directory,
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that is, the starting point for path searches of pathnames
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beginning with
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.Ql / .
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.Pp
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In order for a directory to become the root directory
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a process must have execute (search) access for that directory.
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.Pp
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If the current working directory is not at or under the new root
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directory, it is silently set to the new root directory.
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It should be noted that, on most other systems,
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.Fn chroot
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has no effect on the process's current directory.
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.Pp
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This call is restricted to the super-user.
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.Pp
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The
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.Fn fchroot
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function performs the same operation on an open directory file
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known by the file descriptor
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.Fa fd .
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.Sh RETURN VALUES
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Upon successful completion, a value of 0 is returned.
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Otherwise, a value of \-1 is returned and
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.Va errno
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is set to indicate an error.
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.Sh ERRORS
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.Fn chroot
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will fail and the root directory will be unchanged if:
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.Bl -tag -width Er
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.It Bq Er ENOTDIR
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A component of the path name is not a directory.
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.It Bq Er ENAMETOOLONG
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A component of a pathname exceeded
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.Brq Dv NAME_MAX
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characters, or an entire path name exceeded
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.Brq Dv PATH_MAX
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characters.
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.It Bq Er ENOENT
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The named directory does not exist.
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.It Bq Er EACCES
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Search permission is denied for any component of the path name.
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.It Bq Er ELOOP
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Too many symbolic links were encountered in translating the pathname.
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.It Bq Er EFAULT
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.Fa dirname
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points outside the process's allocated address space.
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.It Bq Er EIO
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An I/O error occurred while reading from or writing to the file system.
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.It Bq Er EPERM
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The effective user ID of the calling process is not the super-user.
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.El
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.Pp
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.Fn fchroot
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will fail and the root directory will be unchanged if:
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.Bl -tag -width Er
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.It Bq Er EACCES
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Search permission is denied for the directory referenced
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by the file descriptor.
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.It Bq Er EBADF
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The argument
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.Fa fd
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is not a valid file descriptor.
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.It Bq Er EIO
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An I/O error occurred while reading from or writing to the file system.
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.It Bq Er ENOTDIR
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The argument
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.Fa fd
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does not reference a directory.
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.It Bq Er EPERM
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The effective user ID of the calling process is not the super-user.
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.El
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.Sh SEE ALSO
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.Xr chdir 2
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.Sh STANDARDS
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The
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.Fn chroot
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function conforms to
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.St -xsh5 ,
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with the restriction that the calling process' working directory must be at
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or under the new root directory.
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Otherwise, the working directory is silently set to the new root directory;
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this is an extension to the standard.
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.Pp
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.Fn chroot
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was declared a legacy interface, and subsequently removed in
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.St -p1003.1-2001 .
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.Sh HISTORY
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The
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.Fn chroot
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function call appeared in
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.Bx 4.2 .
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Working directory handling was changed in
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.Nx 1.4
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to prevent one way a process could use a second
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.Fn chroot
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call to a different directory to "escape" from the restricted subtree.
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The
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.Fn fchroot
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function appeared in
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.Nx 1.4 .
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