bsd/man/man2/chflags.2

   1 .\"     $NetBSD: chflags.2,v 1.6 1995/02/27 12:32:03 cgd 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. 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 .\"     @(#)chflags.2   8.1 (Berkeley) 6/9/93
  35 .\"
  36 .Dd June 9, 1993
  37 .Dt CHFLAGS 2
  38 .Os
  39 .Sh NAME
  40 .Nm chflags ,
  41 .Nm fchflags
  42 .Nd set file flags
  43 .Sh SYNOPSIS
  44 .Fd #include <sys/stat.h>
  45 .Fd #include <unistd.h>
  46 .Ft int
  47 .Fn chflags "const char *path"  "u_int flags"
  48 .Ft int
  49 .Fn fchflags "int fd" "u_int flags"
  50 .Sh DESCRIPTION
  51 The file whose name
  52 is given by
  53 .Fa path
  54 or referenced by the descriptor
  55 .Fa fd
  56 has its flags changed to
  57 .Fa flags .
  58 .Pp
  59 The flags specified are formed by
  60 .Em or Ns 'ing
  61 the following values
  62 .Pp
  63 .Bl -tag -width "SF_IMMUTABLEX" -compact -offset indent
  64 .It UF_NODUMP
  65 Do not dump the file.
  66 .It UF_IMMUTABLE
  67 The file may not be changed.
  68 .It UF_APPEND
  69 The file may only be appended to.
  70 .It UF_OPAQUE
  71 The directory is opaque when viewed through a union stack.
  72 .It UF_HIDDEN
  73 The file or directory is not intended to be displayed to the user.
  74 .It SF_ARCHIVED
  75 The file has been archived.
  76 .It SF_IMMUTABLE
  77 The file may not be changed.
  78 .It SF_APPEND
  79 The file may only be appended to.
  80 .El
  81 .Pp
  82 The
  83 .Dq UF_IMMUTABLE ,
  84 .Dq UF_APPEND ,
  85 .Dq UF_OPAQUE ,
  86 and
  87 .Dq UF_HIDDEN
  88 flags may be set or unset by either the owner of a file or the super-user.
  89 .Pp
  90 The
  91 .Dq SF_ARCHIVED ,
  92 .Dq SF_IMMUTABLE
  93 and
  94 .Dq SF_APPEND
  95 flags may only be set or unset by the super-user.
  96 They may be set at any time, but normally may only be unset when
  97 the system is in single-user mode.
  98 (See
  99 .Xr init 8
 100 for details.)
 101 .Sh RETURN VALUES
 102 Upon successful completion, a value of 0 is returned.
 103 Otherwise, -1 is returned and the global variable
 104 .Va errno
 105 is set to indicate the error.
 106 .Sh ERRORS
 107 .Fn Chflags
 108 will fail it:
 109 .Bl -tag -width Er
 110 .It Bq Er ENOTDIR
 111 A component of the path prefix is not a directory.
 112 .It Bq Er ENAMETOOLONG
 113 A component of a pathname exceeded
 114 .Dv {NAME_MAX}
 115 characters, or an entire path name exceeded
 116 .Dv {PATH_MAX}
 117 characters.
 118 .It Bq Er ENOENT
 119 The named file does not exist.
 120 .It Bq Er EACCES
 121 Search permission is denied for a component of the path prefix.
 122 .It Bq Er ELOOP
 123 Too many symbolic links were encountered in translating the pathname.
 124 .It Bq Er EPERM
 125 The effective user ID does not match the owner of the file and
 126 the effective user ID is not the super-user.
 127 .It Bq Er EROFS
 128 The named file resides on a read-only file system.
 129 .It Bq Er EFAULT
 130 .Fa Path
 131 points outside the process's allocated address space.
 132 .It Bq Er EIO
 133 An
 134 .Tn I/O
 135 error occurred while reading from or writing to the file system.
 136 .El
 137 .Pp
 138 .Fn Fchflags
 139 will fail if:
 140 .Bl -tag -width Er
 141 .It Bq Er EBADF
 142 The descriptor is not valid.
 143 .It Bq Er EINVAL
 144 .Fa fd
 145 refers to a socket, not to a file.
 146 .It Bq Er EPERM
 147 The effective user ID does not match the owner of the file and
 148 the effective user ID is not the super-user.
 149 .It Bq Er EROFS
 150 The file resides on a read-only file system.
 151 .It Bq Er EIO
 152 An
 153 .Tn I/O
 154 error occurred while reading from or writing to the file system.
 155 .El
 156 .Sh SEE ALSO
 157 .Xr chflags 1 ,
 158 .Xr fflagstostr 3 ,
 159 .Xr strtofflags 3 ,
 160 .Xr init 8
 161 .Sh HISTORY
 162 The
 163 .Fn chflags
 164 and
 165 .Nm fchflags
 166 functions first appeared in 4.4BSD.