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Top Forums Programming read() without changing atime ? Post 302113659 by tantric on Sunday 8th of April 2007 08:42:09 PM
Old 04-08-2007
Guys, why is the atime not changing ? I use cat to read the file.. why the hell does the atime not change Smilie is there some setting that I need to change ? Also, if I use read in my program, the atime does not change..

% uname -a
SunOS 5.8 Generic_108528-29 sun4u sparc SUNW,Sun-Fire-480R
% date
Sun Apr 8 17:32:09 PDT 2007
% vi file <--------------------------------------- just create a file
% ls -lu file
-rw-rw-r-- 1 varkm 15 Apr 8 17:32 file <----- note the access time
% date
Sun Apr 8 17:35:45 PDT 2007
% cat file
This is a file
% ls -lu file
-rw-rw-r-- 1 varunj 15 Apr 8 17:32 file <---- acc time did not change
%



Now whats weird is that If i do the same thing on a GNU/Linux machine, the cat changes the access time the first time. Any cat after that does not change the atime.

Please help.. I have been breaking my head over this since a long time

Thanks in advance !!!
 

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STAT(3) 								 1								   STAT(3)

stat - Gives information about a file

SYNOPSIS
array stat (string $filename) DESCRIPTION
Gathers the statistics of the file named by $filename. If $filename is a symbolic link, statistics are from the file itself, not the sym- link. lstat(3) is identical to stat(3) except it would instead be based off the symlinks status. PARAMETERS
o $filename - Path to the file. RETURN VALUES
stat(3) and fstat(3) result format +--------+--------------------------------------+---+ |Numeric | | | | | | | | | Associative | | | | | | | | Description | | | | | | +--------+--------------------------------------+---+ | 0 | | | | | | | | | dev | | | | | | | | device number | | | | | | | 1 | | | | | | | | | ino | | | | | | | | inode number * | | | | | | | 2 | | | | | | | | | mode | | | | | | | | inode protection mode | | | | | | | 3 | | | | | | | | | nlink | | | | | | | | number of links | | | | | | | 4 | | | | | | | | | uid | | | | | | | | userid of owner * | | | | | | | 5 | | | | | | | | | gid | | | | | | | | groupid of owner * | | | | | | | 6 | | | | | | | | | rdev | | | | | | | | device type, if inode device | | | | | | | 7 | | | | | | | | | size | | | | | | | | size in bytes | | | | | | | 8 | | | | | | | | | atime | | | | | | | | time of last access (Unix timestamp) | | | | | | | 9 | | | | | | | | | mtime | | | | | | | | time of last modification (Unix | | | | timestamp) | | | | | | | 10 | | | | | | | | | ctime | | | | | | | | time of last inode change (Unix | | | | timestamp) | | | | | | | 11 | | | | | | | | | blksize | | | | | | | | blocksize of filesystem IO ** | | | | | | | 12 | | | | | | | | | blocks | | | | | | | | number of 512-byte blocks allocated | | | | ** | | | | | | +--------+--------------------------------------+---+ * On Windows this will always be 0. ** Only valid on systems supporting the st_blksize type - other systems (e.g. Windows) return -1. In case of error, stat(3) returns FALSE. Note Because PHP's integer type is signed and many platforms use 32bit integers, some filesystem functions may return unexpected results for files which are larger than 2GB. ERRORS
/EXCEPTIONS Upon failure, an E_WARNING is emitted. EXAMPLES
Example #1 stat(3) example <?php /* Get file stat */ $stat = stat('C:phpphp.exe'); /* * Print file access time, this is the same * as calling fileatime() */ echo 'Access time: ' . $stat['atime']; /* * Print file modification time, this is the * same as calling filemtime() */ echo 'Modification time: ' . $stat['mtime']; /* Print the device number */ echo 'Device number: ' . $stat['dev']; ?> Example #2 Using stat(3) information together with touch(3) <?php /* Get file stat */ $stat = stat('C:phpphp.exe'); /* Did we failed to get stat information? */ if (!$stat) { echo 'stat() call failed...'; } else { /* * We want the access time to be 1 week * after the current access time. */ $atime = $stat['atime'] + 604800; /* Touch the file */ if (!touch('some_file.txt', time(), $atime)) { echo 'Failed to touch file...'; } else { echo 'touch() returned success...'; } } ?> NOTES
Note Note that time resolution may differ from one file system to another. Note The results of this function are cached. See clearstatcache(3) for more details. Tip As of PHP 5.0.0, this function can also be used with some URL wrappers. Refer to "Supported Protocols and Wrappers" to determine which wrappers support stat(3) family of functionality. SEE ALSO
lstat(3), fstat(3), filemtime(3), filegroup(3). PHP Documentation Group STAT(3)
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