137 lines
4 KiB
Groff
137 lines
4 KiB
Groff
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.\" $NetBSD: chdir.2,v 1.21 2010/05/31 12:16:20 njoly Exp $
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.\"
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.\" 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. 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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.\"
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.Dd December 11, 1993
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.Dt CHDIR 2
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.Os
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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 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 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
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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 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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.It Bq Er EPERM
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The argument
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.Fa fd
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references a directory which is not at or below the current process's
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root directory.
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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 conforms to
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.St -p1003.1-90 .
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.Sh HISTORY
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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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