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1130b656e5
This will make a number of things easier in the future, as well as (finally!) avoiding the Id-smashing problem which has plagued developers for so long. Boy, I'm glad we're not using sup anymore. This update would have been insane otherwise.
134 lines
4.1 KiB
Groff
134 lines
4.1 KiB
Groff
.\" Copyright (c) 1980, 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. 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 University of
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.\" California, Berkeley and its contributors.
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.\" 4. 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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.\" @(#)chdir.2 8.2 (Berkeley) 12/11/93
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.\" $FreeBSD$
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.\"
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.Dd December 11, 1993
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.Dt CHDIR 2
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.Os BSD 4
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.Sh NAME
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.Nm chdir ,
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.Nm fchdir
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.Nd change current working directory
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.Sh SYNOPSIS
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.Fd #include <unistd.h>
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.Ft int
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.Fn chdir "const char *path"
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.Ft int
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.Fn fchdir "int fd"
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.Sh DESCRIPTION
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The
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.Fa path
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argument points to the pathname of a directory.
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The
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.Fn chdir
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function
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causes the named directory
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to become the current working directory, that is,
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the starting point for path searches of pathnames not beginning with
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a slash,
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.Ql / .
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.Pp
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The
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.Fn fchdir
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function
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causes the directory referenced by
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.Fa fd
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to become the current working directory,
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the starting point for path searches of pathnames not beginning with
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a slash,
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.Ql / .
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.Pp
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In order for a directory to become the current directory,
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a process must have execute (search) access to the directory.
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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
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the error.
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.Sh ERRORS
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.Fn Chdir
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will fail and the current working directory will be unchanged if
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one or more of the following are true:
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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 prefix is not a directory.
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.It Bq Er ENAMETOOLONG
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A component of a pathname exceeded 255 characters,
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or an entire path name exceeded 1023 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 ELOOP
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Too many symbolic links were encountered in translating the pathname.
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.It Bq Er EACCES
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Search permission is denied for any component of
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the path name.
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.It Bq Er EFAULT
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.Fa Path
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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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.El
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.Pp
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.Fn Fchdir
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will fail and the current working directory will be unchanged if
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one or more of the following are true:
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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 by the
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file descriptor.
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.It Bq Er ENOTDIR
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The file descriptor does not reference a directory.
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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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.El
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.Sh SEE ALSO
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.Xr chroot 2
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.Sh STANDARDS
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The
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.Fn chdir
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function call is expected to conform to
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.St -p1003.1-90 .
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.Sh HISTORY
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A
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.Fn chdir
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function call appeared in
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.At v7 .
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The
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.Fn fchdir
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function call
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appeared in
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.Bx 4.2 .
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