09-05-2008
I am aware of some UNIX-like enviroments where st_atime is not updated after a read. Interix i.e. Microsoft SUA is one and I think Cygwin is another.
What happens if you touch the file using the touch(1) utility?
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touch(1B) SunOS/BSD Compatibility Package Commands touch(1B)
NAME
touch - change file access and modification times
SYNOPSIS
/usr/ucb/touch [-acfm] file...
DESCRIPTION
touch sets the access and modification times of each file to the current time. file is created if it does not already exist.
OPTIONS
-a Change the access time of file. Do not change the modification time unless -m is also specified.
-c Do not create file if it does not exist.
-f Attempt to force the touch in spite of read and write permissions on file.
-m Change the modification time of file. Do not change the access time unless -a is also specified.
USAGE
See largefile(5) for the description of the behavior of touch when encountering files greater than or equal to 2 Gbyte ( 2**31 bytes).
EXIT STATUS
The following exit values are returned:
0 touch executed successfully and all requested changes were made.
>0 An error occurred. touch returns the number of files for which the times could not be successfully modified.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWscpu |
+-----------------------------+-----------------------------+
SEE ALSO
touch(1), attributes(5), largefile(5)
SunOS 5.10 26 Oct 1995 touch(1B)