Thank you, BrowserUk for your help.

POSIX's lseek does indeed suffer of the same flaw and returns a negative integer.

I guess you're right: unless some other monk comes up with a miraculous solution, I'll stick with with a call to the VMS system.

Thank you for your help.

Update: fixed a typo.

In reply to Re^2: Integer overflow in -s or file stat results by Laurent_R
in thread Integer overflow in -s or file stat results by Laurent_R

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