Monitoring file "read" activity of applications under Mac OS X

Question

Is it possible to monitor file read activity of processes under Mac OS X? (programmatically, or do you know any applications that does this? That can also be helpful.)

Answer 1

Get a file descriptor to your file with open, then use stat to get its last access time.

That method works on any POSIX compliant platform.

Answer 2

You could look at the source for fs_usage in Darwin.