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Subjectmmap/VM snapshot question
I have four processes accessing the same file using mmap() with MAP_SHARED.
I'd like to take a copy-on-write snapshot of that file so that I can do a
backup. However, if I try to start a fifth process and map the file with
MAP_PRIVATE, the copy-on-write only works one way; i.e. changes made by the
other processes can be visible by the backup process.

How do you get the Linux VM to reverse the copy-on-write, where the four
original processes can keep sharing their data and the fifth backup process
retains the data made at the time of the snapshot?


Byron Stanoszek Ph: (330) 644-3059
Systems Programmer Fax: (330) 644-8110
Commercial Timesharing Inc. Email:
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