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
172 lines
4.3 KiB
Groff
172 lines
4.3 KiB
Groff
.\" $NetBSD: getcwd.3,v 1.18 2010/04/29 06:54:26 jruoho Exp $
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.\"
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.\" Copyright (c) 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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.\" @(#)getcwd.3 8.2 (Berkeley) 12/11/93
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.\"
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.Dd April 29, 2010
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.Dt GETCWD 3
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.Os
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.Sh NAME
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.Nm getcwd ,
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.Nm getwd
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.Nd get working directory pathname
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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 char *
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.Fn getcwd "char *buf" "size_t size"
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.Ft char *
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.Fn getwd "char *buf"
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.Sh DESCRIPTION
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The
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.Fn getcwd
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function copies the absolute pathname of the current working directory
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into the memory referenced by
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.Fa buf
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and returns a pointer to
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.Fa buf .
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The
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.Fa size
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argument is the size, in bytes, of the array referenced by
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.Fa buf .
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.Pp
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If
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.Fa buf
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is
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.Dv NULL ,
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space is allocated as necessary to store the pathname.
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This space may later be
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.Xr free 3 Ns 'd .
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.Pp
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The function
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.Fn getwd
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is a compatibility routine which calls
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.Fn getcwd
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with its
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.Fa buf
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argument and a size of
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.Dv MAXPATHLEN
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(as defined in the include
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file
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.In sys/param.h ) .
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Obviously,
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.Fa buf
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should be at least
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.Dv MAXPATHLEN
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bytes in length.
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.Pp
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These routines have traditionally been used by programs to save the
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name of a working directory for the purpose of returning to it.
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A much faster and less error-prone method of accomplishing this is to
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open the current directory
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.Pq Ql \&.
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and use the
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.Xr fchdir 2
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function to return.
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.Sh RETURN VALUES
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Upon successful completion, a pointer to the pathname is returned.
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Otherwise a
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.Dv NULL
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pointer is returned and the global variable
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.Va errno
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is set to indicate the error.
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In addition,
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.Fn getwd
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copies the error message associated with
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.Va errno
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into the memory referenced by
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.Fa buf .
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.Sh ERRORS
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The
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.Fn getcwd
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function
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will fail if:
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.Bl -tag -width Er
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.It Bq Er EACCES
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Read or search permission was denied for a component of the pathname.
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.It Bq Er EINVAL
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The
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.Fa size
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argument is zero.
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.It Bq Er ENOENT
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A component of the pathname no longer exists.
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.It Bq Er ENOMEM
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Insufficient memory is available.
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.It Bq Er ERANGE
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The
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.Fa size
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argument is greater than zero but smaller than the length of the pathname
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plus 1.
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.El
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.Sh SEE ALSO
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.Xr chdir 2 ,
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.Xr fchdir 2 ,
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.Xr malloc 3 ,
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.Xr strerror 3
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.Sh STANDARDS
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The
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.Fn getwd
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and
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.Fn getcwd
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functions conform to
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.St -p1003.1-90 .
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The
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.St -p1003.1-2004
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revision marked
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.Fn getwd
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as legacy and recommended the use of
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.Fn getcwd
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instead.
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The
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.St -p1003.1-2008
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revision removed
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.Fn getwd
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from the specification.
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.Pp
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The ability to specify a
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.Dv NULL
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pointer and have
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.Fn getcwd
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allocate memory as necessary is an extension.
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.Sh HISTORY
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The
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.Fn getwd
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function appeared in
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.Bx 4.0 .
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.Sh SECURITY CONSIDERATIONS
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As
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.Fn getwd
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does not know the length of the supplied buffer, it is possible
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for a long (but valid) path to overflow the buffer and provide
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a means for an attacker to exploit the caller.
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.Fn getcwd
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should be used in place of
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.Fn getwd
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(the latter is only provided for compatibility purposes).
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