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	1	.\" $NetBSD: chdir.2,v 1.7 1995/02/27 12:32:00 cgd Exp $
	2	.\"
	3	.\" Copyright (c) 1980, 1991, 1993
	4	.\" The Regents of the University of California. All rights reserved.
	5	.\"
	6	.\" Redistribution and use in source and binary forms, with or without
	7	.\" modification, are permitted provided that the following conditions
	8	.\" are met:
	9	.\" 1. Redistributions of source code must retain the above copyright
	10	.\" notice, this list of conditions and the following disclaimer.
	11	.\" 2. Redistributions in binary form must reproduce the above copyright
	12	.\" notice, this list of conditions and the following disclaimer in the
	13	.\" documentation and/or other materials provided with the distribution.
	14	.\" 3. All advertising materials mentioning features or use of this software
	15	.\" must display the following acknowledgement:
	16	.\" This product includes software developed by the University of
	17	.\" California, Berkeley and its contributors.
	18	.\" 4. Neither the name of the University nor the names of its contributors
	19	.\" may be used to endorse or promote products derived from this software
	20	.\" without specific prior written permission.
	21	.\"
	22	.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	23	.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	24	.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	25	.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	26	.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	27	.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	28	.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	29	.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	30	.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	31	.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	32	.\" SUCH DAMAGE.
	33	.\"
	34	.\" @(#)chdir.2 8.2 (Berkeley) 12/11/93
	35	.\"
	36	.Dd December 11, 1993
	37	.Dt CHDIR 2
	38	.Os BSD 4
	39	.Sh NAME
	40	.Nm chdir ,
	41	.Nm fchdir
	42	.Nd change current working directory
	43	.Sh SYNOPSIS
	44	.Fd #include <unistd.h>
	45	.Ft int
	46	.Fo chdir
	47	.Fa "const char *path"
	48	.Fc
	49	.Ft int
	50	.Fo fchdir
	51	.Fa "int fildes"
	52	.Fc
	53	.Sh DESCRIPTION
	54	The
	55	.Fa path
	56	argument points to the pathname of a directory.
	57	The
	58	.Fn chdir
	59	function
	60	causes the named directory
	61	to become the current working directory, that is,
	62	the starting point for path searches of pathnames not beginning with
	63	a slash,
	64	.Ql / .
	65	.Pp
	66	The
	67	.Fn fchdir
	68	function
	69	causes the directory referenced by
	70	.Fa fildes
	71	to become the current working directory,
	72	the starting point for path searches of pathnames not beginning with
	73	a slash,
	74	.Ql / .
	75	.Pp
	76	In order for a directory to become the current directory,
	77	a process must have execute (search) access to the directory.
	78	.Sh RETURN VALUES
	79	Upon successful completion, a value of 0 is returned.
	80	Otherwise, a value of -1 is returned and
	81	.Va errno
	82	is set to indicate
	83	the error.
	84	.Sh ERRORS
	85	The
	86	.Fn chdir
	87	system call will fail
	88	and the current working directory will be unchanged
	89	if one or more of the following are true:
	90	.Bl -tag -width Er
	91	.\" ==========
	92	.It Bq Er EACCES
	93	Search permission is denied for any component of
	94	the path name.
	95	.\" ==========
	96	.It Bq Er EFAULT
	97	.Fa Path
	98	points outside the process's allocated address space.
	99	.\" ==========
	100	.It Bq Er EIO
	101	An I/O error occurred while reading from or writing to the file system.
	102	.\" ==========
	103	.It Bq Er ELOOP
	104	Too many symbolic links were encountered in translating the pathname.
	105	This is taken to be indicative of a looping symbolic link.
	106	.\" ==========
	107	.It Bq Er ENAMETOOLONG
	108	A component of a pathname exceeded
	109	.Dv {NAME_MAX}
	110	characters, or an entire path name exceeded
	111	.Dv {PATH_MAX}
	112	characters.
	113	.\" ==========
	114	.It Bq Er ENOENT
	115	The named directory does not exist.
	116	.\" ==========
	117	.It Bq Er ENOTDIR
	118	A component of the path prefix is not a directory.
	119	.El
	120	.Pp
	121	.Fn fchdir
	122	will fail and the current working directory will be unchanged if
	123	one or more of the following are true:
	124	.Bl -tag -width Er
	125	.\" ==========
	126	.It Bq Er EACCES
	127	Search permission is denied for the directory referenced by the
	128	file descriptor.
	129	.\" ==========
	130	.It Bq Er EBADF
	131	The argument
	132	.Fa fildes
	133	is not a valid file descriptor.
	134	.\" ==========
	135	.It Bq Er EINTR
	136	.Fn fchdir
	137	was interrupted by a signal.
	138	.\" ==========
	139	.It Bq Er EIO
	140	An I/O error occurred while reading from or writing to the file system.
	141	.\" ==========
	142	.It Bq Er ENOTDIR
	143	The file descriptor does not reference a directory.
	144	.El
	145	.Sh SEE ALSO
	146	.Xr chroot 2
	147	.Sh STANDARDS
	148	The
	149	.Fn chdir
	150	is expected to conform to
	151	.St -p1003.1-88 .
	152	.Sh HISTORY
	153	The
	154	.Fn fchdir
	155	function call
	156	appeared in
	157	.Bx 4.2 .