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Old 11-23-2008
jim mcnamara jim mcnamara is online now Forum Staff  
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Join Date: Feb 2004
Location: NM
Posts: 5,795
Look at the GNU C code for touch. Download from here:
http://ftp.gnu.org/gnu/coreutils/

Normally the kernel/filesystem maintains timestamps so you would have to look at that code if your OS is opensource.