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
214 lines
5.5 KiB
Groff
214 lines
5.5 KiB
Groff
.\" $NetBSD: chown.2,v 1.31 2010/05/31 12:16:20 njoly Exp $
|
|
.\"
|
|
.\" Copyright (c) 1980, 1991, 1993, 1994
|
|
.\" The Regents of the University of California. All rights reserved.
|
|
.\"
|
|
.\" 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.
|
|
.\" 3. Neither the name of the University nor the names of its contributors
|
|
.\" may be used to endorse or promote products derived from this software
|
|
.\" without specific prior written permission.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
|
|
.\"
|
|
.\" @(#)chown.2 8.4 (Berkeley) 4/19/94
|
|
.\"
|
|
.Dd April 19, 1994
|
|
.Dt CHOWN 2
|
|
.Os
|
|
.Sh NAME
|
|
.Nm chown ,
|
|
.Nm lchown ,
|
|
.Nm fchown
|
|
.Nd change owner and group of a file
|
|
.Sh LIBRARY
|
|
.Lb libc
|
|
.Sh SYNOPSIS
|
|
.In unistd.h
|
|
.Ft int
|
|
.Fn chown "const char *path" "uid_t owner" "gid_t group"
|
|
.Ft int
|
|
.Fn lchown "const char *path" "uid_t owner" "gid_t group"
|
|
.Ft int
|
|
.Fn fchown "int fd" "uid_t owner" "gid_t group"
|
|
.Sh DESCRIPTION
|
|
The owner ID and group ID of the file
|
|
named by
|
|
.Fa path
|
|
or referenced by
|
|
.Fa fd
|
|
is changed as specified by the arguments
|
|
.Fa owner
|
|
and
|
|
.Fa group .
|
|
The owner of a file may change the
|
|
.Fa group
|
|
to a group of which
|
|
he or she is a member,
|
|
but the change
|
|
.Fa owner
|
|
capability is restricted to the super-user.
|
|
.Pp
|
|
When called to change the owner of a file,
|
|
.Fn chown ,
|
|
.Fn lchown
|
|
and
|
|
.Fn fchown
|
|
clear the set-user-id
|
|
.Dv ( S_ISUID )
|
|
bit on the file.
|
|
When a called to change the group of a file,
|
|
.Fn chown ,
|
|
.Fn lchown
|
|
and
|
|
.Fn fchown
|
|
clear the set-group-id
|
|
.Dv ( S_ISGID )
|
|
bit on the file.
|
|
These actions are taken to prevent accidental or mischievous creation of
|
|
set-user-id and set-group-id programs.
|
|
.Pp
|
|
.Fn lchown
|
|
is like
|
|
.Fn chown
|
|
except in the case where the named file is a symbolic link,
|
|
in which case
|
|
.Fn lchown
|
|
changes the owner and group of the link,
|
|
while
|
|
.Fn chown
|
|
changes the owner and group of the file the link references.
|
|
.Pp
|
|
.Fn fchown
|
|
is particularly useful when used in conjunction
|
|
with the file locking primitives (see
|
|
.Xr flock 2 ) .
|
|
.Pp
|
|
One of the owner or group id's
|
|
may be left unchanged by specifying it as (uid_t)\-1 or (gid_t)\-1 respectively.
|
|
.Sh RETURN VALUES
|
|
Zero is returned if the operation was successful;
|
|
\-1 is returned if an error occurs, with a more specific
|
|
error code being placed in the global variable
|
|
.Va errno .
|
|
.Sh ERRORS
|
|
.Fn chown
|
|
and
|
|
.Fn lchown
|
|
will fail and the file will be unchanged if:
|
|
.Bl -tag -width Er
|
|
.It Bq Er ENOTDIR
|
|
A component of the path prefix is not a directory.
|
|
.It Bq Er ENAMETOOLONG
|
|
A component of a pathname exceeded
|
|
.Brq Dv NAME_MAX
|
|
characters, or an entire path name exceeded
|
|
.Brq Dv PATH_MAX
|
|
characters.
|
|
.It Bq Er ENOENT
|
|
The named file does not exist.
|
|
.It Bq Er EACCES
|
|
Search permission is denied for a component of the path prefix.
|
|
.It Bq Er ELOOP
|
|
Too many symbolic links were encountered in translating the pathname.
|
|
.It Bq Er EPERM
|
|
The effective user ID is not the super-user.
|
|
.It Bq Er EROFS
|
|
The named file resides on a read-only file system.
|
|
.It Bq Er EFAULT
|
|
.Fa path
|
|
points outside the process's allocated address space.
|
|
.It Bq Er EIO
|
|
An I/O error occurred while reading from or writing to the file system.
|
|
.El
|
|
.Pp
|
|
.Fn fchown
|
|
will fail if:
|
|
.Bl -tag -width Er
|
|
.It Bq Er EBADF
|
|
.Fa fd
|
|
does not refer to a valid descriptor.
|
|
.It Bq Er EINVAL
|
|
.Fa fd
|
|
refers to a socket, not a file.
|
|
.It Bq Er EPERM
|
|
The effective user ID is not the super-user.
|
|
.It Bq Er EROFS
|
|
The named file resides on a read-only file system.
|
|
.It Bq Er EIO
|
|
An I/O error occurred while reading from or writing to the file system.
|
|
.El
|
|
.Sh SEE ALSO
|
|
.Xr chgrp 1 ,
|
|
.Xr chmod 2 ,
|
|
.Xr flock 2 ,
|
|
.Xr symlink 7 ,
|
|
.Xr chown 8
|
|
.Sh STANDARDS
|
|
The
|
|
.Fn chown
|
|
function deviates from the semantics defined in
|
|
.St -p1003.1-90 ,
|
|
which specifies that, unless the caller is the super-user, both the
|
|
set-user-id and set-group-id bits on a file shall be cleared, regardless
|
|
of the file attribute changed.
|
|
The
|
|
.Fn lchown
|
|
and
|
|
.Fn fchown
|
|
functions, as defined by
|
|
.St -xpg4.2 ,
|
|
provide the same semantics.
|
|
.Pp
|
|
To retain conformance to these standards, compatibility interfaces
|
|
are provided by the
|
|
.Lb libposix
|
|
as follows:
|
|
.Bl -bullet -compact
|
|
.It
|
|
The
|
|
.Fn chown
|
|
function conforms to
|
|
.St -p1003.1-90
|
|
and
|
|
.St -xpg4.2 .
|
|
.It
|
|
The
|
|
.Fn lchown
|
|
and
|
|
.Fn fchown
|
|
functions conform to
|
|
.St -xpg4.2 .
|
|
.El
|
|
.Sh HISTORY
|
|
The
|
|
.Fn fchown
|
|
function call appeared in
|
|
.Bx 4.2 .
|
|
.Pp
|
|
The
|
|
.Fn chown
|
|
and
|
|
.Fn fchown
|
|
functions were changed to follow symbolic links in
|
|
.Bx 4.4 .
|
|
The
|
|
.Fn lchown
|
|
function call appeared in
|
|
.Nx 1.3 .
|