xref: /dragonfly/lib/libc/sys/chflags.2 (revision dc71b7ab) 
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28.\"	@(#)chflags.2	8.3 (Berkeley) 5/2/95
29.\" $FreeBSD: src/lib/libc/sys/chflags.2,v 1.11.2.7 2001/12/14 18:34:00 ru Exp $
30.\" $DragonFly: src/lib/libc/sys/chflags.2,v 1.5 2008/11/11 00:55:49 pavalos Exp $
31.\"
32.Dd November 10, 2008
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
52The file whose name
53is given by
54.Fa path
55or referenced by the descriptor
56.Fa fd
57has its flags changed to
58.Fa flags .
59.Pp
60The
61.Fn lchflags
62system call is like
63.Fn chflags
64except in the case where the named file is a symbolic link,
65in which case
66.Fn lchflags
67will change the flags of the link itself,
68rather than the file it points to.
69.Pp
70The flags specified are formed by
71.Em or Ns 'ing
72the following values
73.Pp
74.Bl -tag -width "SF_IMMUTABLE" -compact -offset indent
75.It UF_NODUMP
76Do not dump the file.
77.It UF_IMMUTABLE
78The file may not be changed.
79.It UF_APPEND
80The file may only be appended to.
81.It UF_OPAQUE
82The directory is opaque when viewed through a union stack.
83.It UF_NOUNLINK
84The file may not be renamed or deleted.
85.It UF_NOHISTORY
86Do not retain history for file.
87.It UF_CACHE
88Enable
89.Xr swapcache 8
90data caching.
91The flag is recursive and need only be set on a top-level directory.
92.It SF_ARCHIVED
93The file may be archived.
94.It SF_IMMUTABLE
95The file may not be changed.
96.It SF_APPEND
97The file may only be appended to.
98.It SF_NOUNLINK
99The file may not be renamed or deleted.
100.It SF_NOHISTORY
101Do not retain history for file.
102.It SF_NOCACHE
103Disable
104.Xr swapcache 8
105data caching.
106The flag is recursive and need only be set on a top-level directory.
107.El
108.Pp
109The
110.Dq UF_
111prefixed
112flags may be set or unset by either the owner of a file or the super-user.
113.Pp
114The
115.Dq SF_
116prefixed
117flags may only be set or unset by the super-user.
118Attempts by the non-super-user to set the super-user only flags
119are silently ignored.
120These flags may be set at any time, but normally may only be unset when
121the system is in single-user mode.
122(See
123.Xr init 8
124for details.)
125.Sh RETURN VALUES
126.Rv -std
127.Sh ERRORS
128.Fn Chflags
129will fail if:
130.Bl -tag -width Er
131.It Bq Er ENOTDIR
132A component of the path prefix is not a directory.
133.It Bq Er ENAMETOOLONG
134A component of a pathname exceeded 255 characters,
135or an entire path name exceeded 1023 characters.
136.It Bq Er ENOENT
137The named file does not exist.
138.It Bq Er EACCES
139Search permission is denied for a component of the path prefix.
140.It Bq Er ELOOP
141Too many symbolic links were encountered in translating the pathname.
142.It Bq Er EPERM
143The effective user ID does not match the owner of the file and
144the effective user ID is not the super-user.
145.It Bq Er EROFS
146The named file resides on a read-only file system.
147.It Bq Er EFAULT
148.Fa Path
149points outside the process's allocated address space.
150.It Bq Er EIO
151An
152.Tn I/O
153error occurred while reading from or writing to the file system.
154.It Bq Er EOPNOTSUPP
155The underlying file system does not support file flags.
156.El
157.Pp
158.Fn Fchflags
159will fail if:
160.Bl -tag -width Er
161.It Bq Er EBADF
162The descriptor is not valid.
163.It Bq Er EINVAL
164.Fa fd
165refers to a socket, not to a file.
166.It Bq Er EPERM
167The effective user ID does not match the owner of the file and
168the effective user ID is not the super-user.
169.It Bq Er EROFS
170The file resides on a read-only file system.
171.It Bq Er EIO
172An
173.Tn I/O
174error occurred while reading from or writing to the file system.
175.It Bq Er EOPNOTSUPP
176The underlying file system does not support file flags.
177.El
178.Sh SEE ALSO
179.Xr chflags 1 ,
180.Xr fflagstostr 3 ,
181.Xr strtofflags 3 ,
182.Xr init 8 ,
183.Xr mount_union 8 ,
184.Xr swapcache 8
185.Sh HISTORY
186The
187.Nm chflags
188and
189.Nm fchflags
190functions first appeared in
191.Bx 4.4 .
192