xattr_get
(no version information, might be only in CVS)
xattr_get --
Get an extended attribute
Description
string
xattr_get ( string filename, string name [, int flags] )
This function gets the value of an extended attribute of a file.
Extended attributes have two different namespaces: user
and root namespace. User namespace is available for all users while root namespace
is available only for user with root privileges. xattr operates on user namespace
by default, but you can change that using flags argument.
Parameters
- filename
The file from which we get the attribute.
- name
The name of the attribute.
- flags
Table 1. Supported xattr flags
| XATTR_DONTFOLLOW | Do not follow the symbolic link but operate on symbolic link itself. |
| XATTR_ROOT | Set attribute in root (trusted) namespace. Requires root privileges. |
Return Values
Returns a string containing the value or FALSE if the attribute doesn't
exist.
Examples
Example 1. Checks if system administrator has signed the file
<?php
$file = '/usr/local/sbin/some_binary';
$signature = xattr_get($file, 'Root signature', XATTR_ROOT);
/* ... check if $signature is valid ... */
?>
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