04-04-2007
You are right, you must have write permission to update atime and/or mtime. Bear in mind that such an update will set ctime and you cannot restore ctime. (ls -lc will show ctime)
If you mount a file system read-only atime will not be updated. Some filesystems have a mount option to inhibit atime updates (which is intended to improve performance.) No other way that I know of.
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LEARN ABOUT PHP
eio_futime
EIO_FUTIME(3) 1 EIO_FUTIME(3)
eio_futime - Change file last access and modification times
SYNOPSIS
resource eio_futime (mixed $fd, float $atime, float $mtime, [int $pri = EIO_PRI_DEFAULT], [callable $callback = NULL], [mixed $data =
NULL])
DESCRIPTION
eio_futime(3) changes file last access and modification times.
PARAMETERS
o $fd
- Stream, Socket resource, or numeric file descriptor, e.g. returned by eio_open(3)
o $atime
- Access time
o $mtime
- Modification time
o $pri
-The request priority: EIO_PRI_DEFAULT, EIO_PRI_MIN, EIO_PRI_MAX, or NULL. If NULL passed, $pri internally is set to
EIO_PRI_DEFAULT.
o $callback
-$callback function is called when the request is done. It should match the following prototype:
void callback(mixed $data, int $result[, resource $req]);
o $data
-is custom data passed to the request.
o $result
-request-specific result value; basically, the value returned by corresponding system call.
o $req
-is optional request resource which can be used with functions like eio_get_last_error(3)
o $data
- Arbitrary variable passed to $callback.
RETURN VALUES
eio_futime(3) returns request resource on success or FALSE on error.
SEE ALSO eio_utime.
PHP Documentation Group EIO_FUTIME(3)