| blob | b045d6ea05f16316a15d4e5f552e335d0ab1f6c9 |
1 .\" $NetBSD: chflags.2,v 1.28 2013/06/08 06:05:03 kardel Exp $
2 .\"
3 .\" Copyright (c) 1989, 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. Neither the name of the University nor the names of its contributors
15 .\" may be used to endorse or promote products derived from this software
16 .\" without specific prior written permission.
17 .\"
18 .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
19 .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 .\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
22 .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 .\" SUCH DAMAGE.
29 .\"
30 .\" @(#)chflags.2 8.3 (Berkeley) 5/2/95
31 .\"
32 .Dd August 6, 2011
33 .Dt CHFLAGS 2
34 .Os
35 .Sh NAME
36 .Nm chflags ,
37 .Nm lchflags ,
38 .Nm fchflags
39 .Nd set file flags
40 .Sh LIBRARY
41 .Lb libc
42 .Sh SYNOPSIS
43 .In sys/stat.h
44 .In unistd.h
45 .Ft int
46 .Fn chflags "const char *path" "u_long flags"
47 .Ft int
48 .Fn lchflags "const char *path" "u_long flags"
49 .Ft int
50 .Fn fchflags "int fd" "u_long flags"
51 .Sh DESCRIPTION
52 The file whose name
53 is given by
54 .Fa path
55 or referenced by the descriptor
56 .Fa fd
57 has its flags changed to
58 .Fa flags .
59 For
60 .Fn lchflags ,
61 symbolic links are not traversed and thus their modes may be changed with
62 this call.
63 .Pp
64 The flags specified are formed by
65 .Em or Ns 'ing
66 the following values:
67 .Pp
68 .Bl -tag -width "SF_IMMUTABLE" -compact -offset indent
69 .It Dv UF_NODUMP
70 Do not dump the file.
71 .It Dv UF_IMMUTABLE
72 The file may not be changed.
73 .It Dv UF_APPEND
74 The file may only be appended to.
75 .It Dv UF_OPAQUE
76 The file (if a directory) is opaque for union mounts.
77 .It Dv SF_ARCHIVED
78 The file is archived.
79 .It Dv SF_IMMUTABLE
80 The file may not be changed.
81 .It Dv SF_APPEND
82 The file may only be appended to.
83 .El
84 .Pp
85 The
86 .Dv UF_NODUMP ,
87 .Dv UF_IMMUTABLE ,
88 .Dv UF_APPEND ,
89 and
90 .Dv UF_OPAQUE
91 flags may be set or unset by either the owner of a file or the super-user,
92 except on block and character devices, where only the super-user may set
93 or unset them.
94 .Pp
95 The
96 .Dv SF_ARCHIVED ,
97 .Dv SF_IMMUTABLE ,
98 and
99 .Dv SF_APPEND
100 flags may only be set or unset by the super-user.
101 These flags may be set at any time, but normally may only be unset when
102 the system is in single-user mode.
103 (See
104 .Xr init 8
105 for details.)
106 .Sh RETURN VALUES
107 Upon successful completion, a value of 0 is returned.
108 Otherwise, \-1 is returned and the global variable
109 .Va errno
110 is set to indicate the error.
111 .Sh ERRORS
112 .Fn chflags
113 will fail if:
114 .Bl -tag -width Er
115 .It Bq Er ENOTDIR
116 A component of the path prefix is not a directory.
117 .It Bq Er ENAMETOOLONG
118 A component of a pathname exceeded
119 .Brq Dv NAME_MAX
120 characters, or an entire path name exceeded
121 .Brq Dv PATH_MAX
122 characters.
123 .It Bq Er ENOENT
124 The named file does not exist.
125 .It Bq Er EACCES
126 Search permission is denied for a component of the path prefix.
127 .It Bq Er ELOOP
128 Too many symbolic links were encountered in translating the pathname.
129 .It Bq Er EPERM
130 The effective user ID does not match the owner of the file and
131 the effective user ID is not the super-user, or
132 the effective user ID is not the super-user and one or more of the
133 super-user-only flags for the named file would be changed.
134 .It Bq Er EOPNOTSUPP
135 The named file resides on a file system that does not support file
136 flags.
137 .It Bq Er EROFS
138 The named file resides on a read-only file system.
139 .It Bq Er EFAULT
140 .Fa path
141 points outside the process's allocated address space.
142 .It Bq Er EIO
143 An
144 .Tn I/O
145 error occurred while reading from or writing to the file system.
146 .El
147 .Pp
148 .Fn fchflags
149 will fail if:
150 .Bl -tag -width Er
151 .It Bq Er EBADF
152 The descriptor is not valid.
153 .It Bq Er EINVAL
154 .Fa fd
155 refers to a socket, not to a file.
156 .It Bq Er EPERM
157 The effective user ID does not match the owner of the file and
158 the effective user ID is not the super-user, or
159 the effective user ID is not the super-user and one or more of the
160 super-user-only flags for the file would be changed.
161 .It Bq Er EOPNOTSUPP
162 The file resides on a file system that does not support file flags.
163 .It Bq Er EROFS
164 The file resides on a read-only file system.
165 .It Bq Er EIO
166 An
167 .Tn I/O
168 error occurred while reading from or writing to the file system.
169 .El
170 .Sh SEE ALSO
171 .Xr chflags 1 ,
172 .Xr stat 2 ,
173 .Xr stat_flags 3 ,
174 .Xr init 8 ,
175 .Xr mount_union 8
176 .Sh HISTORY
177 The
178 .Fn chflags
179 and
180 .Fn fchflags
181 functions first appeared in
182 .Bx 4.4 .
183 The
184 .Fn lchflags
185 function first appeared in
186 .Nx 1.5 .