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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 . |