Top Forums Programming read() without changing atime ? Post 302113226 by Perderabo on Wednesday 4th of April 2007 08:14:08 AM
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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TIME(3F)																  TIME(3F)

NAME
time, ctime, ltime, gmtime - return system time SYNOPSIS
integer function time() character*(*) function ctime (stime) integer stime subroutine ltime (stime, tarray) integer stime, tarray(9) subroutine gmtime (stime, tarray) integer stime, tarray(9) DESCRIPTION
Time returns the time since 00:00:00 GMT, Jan. 1, 1970, measured in seconds. This is the value of the UNIX system clock. Ctime converts a system time to a 24 character ASCII string. The format is described under ctime(3). No 'newline' or NULL will be included. Ltime and gmtime disect a UNIX time into month, day, etc., either for the local time zone or as GMT. The order and meaning of each element returned in tarray is described under ctime(3). FILES
/usr/lib/libU77.a SEE ALSO
ctime(3), itime(3F), idate(3F), fdate(3F) 4.2 Berkeley Distribution May 15, 1985 TIME(3F)

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