bsd/man/man2/chflags.2

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  34 .\"     @(#)chflags.2   8.1 (Berkeley) 6/9/93
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  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  75 The file has been archived.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 .It SF_DATALESS
  81 The file is a dataless placeholder.
  82 The system will attempt to materialize it when accessed according to the dataless file materialization policy of the accessing thread or process.
  83 See
  84 .Xr getiopolicy_np 3 .
  85 .El
  86 .Pp
  87 The
  88 .Dq UF_IMMUTABLE ,
  89 .Dq UF_APPEND ,
  90 .Dq UF_OPAQUE ,
  91 and
  92 .Dq UF_HIDDEN
  93 flags may be set or unset by either the owner of a file or the super-user.
  94 .Pp
  95 The
  96 .Dq SF_ARCHIVED ,
  97 .Dq SF_IMMUTABLE
  98 and
  99 .Dq SF_APPEND
 100 flags may only be set or unset by the super-user.
 101 .Pp
 102 The
 103 .Dq SF_DATALESS
 104 flag is an internal flag and may not be set from user space.
 105 .Sh RETURN VALUES
 106 Upon successful completion, a value of 0 is returned.
 107 Otherwise, -1 is returned and the global variable
 108 .Va errno
 109 is set to indicate the error.
 110 .Sh ERRORS
 111 .Fn chflags
 112 will fail if:
 113 .Bl -tag -width Er
 114 .It Bq Er ENOTDIR
 115 A component of the path prefix is not a directory.
 116 .It Bq Er ENAMETOOLONG
 117 A component of a pathname exceeded
 118 .Dv {NAME_MAX}
 119 characters, or an entire path name exceeded
 120 .Dv {PATH_MAX}
 121 characters.
 122 .It Bq Er ENOENT
 123 The named file does not exist.
 124 .It Bq Er EACCES
 125 Search permission is denied for a component of the path prefix.
 126 .It Bq Er ELOOP
 127 Too many symbolic links were encountered in translating the pathname.
 128 .It Bq Er EPERM
 129 The effective user ID does not match the owner of the file and
 130 the effective user ID is not the super-user.
 131 .It Bq Er EROFS
 132 The named file resides on a read-only file system.
 133 .It Bq Er EFAULT
 134 .Fa Path
 135 points outside the process's allocated address space.
 136 .It Bq Er EIO
 137 An
 138 .Tn I/O
 139 error occurred while reading from or writing to the file system.
 140 .It Bq Er ENOTSUP
 141 The operation isn't supported by the filesystem.
 142 .El
 143 .Pp
 144 .Fn fchflags
 145 will fail if:
 146 .Bl -tag -width Er
 147 .It Bq Er EBADF
 148 The descriptor is not valid.
 149 .It Bq Er EINVAL
 150 .Fa fd
 151 refers to a socket, not to a file.
 152 .It Bq Er EPERM
 153 The effective user ID does not match the owner of the file and
 154 the effective user ID is not the super-user.
 155 .It Bq Er EROFS
 156 The file resides on a read-only file system.
 157 .It Bq Er EIO
 158 An
 159 .Tn I/O
 160 error occurred while reading from or writing to the file system.
 161 .It Bq Er ENOTSUP
 162 The operation isn't supported by the filesystem.
 163 .El
 164 .Sh SEE ALSO
 165 .Xr chflags 1 ,
 166 .Xr fflagstostr 3 ,
 167 .Xr lchflags 3 ,
 168 .Xr strtofflags 3 ,
 169 .Xr launchd 8
 170 .Sh HISTORY
 171 The
 172 .Fn chflags
 173 and
 174 .Nm fchflags
 175 functions first appeared in 4.4BSD.