On Tue, Apr 23, 2013 at 12:04 PM, Paul Smith <psm...@gnu.org> wrote: > > I'm not sure if the lock locks the FD (so that if you dup'd the FD but > it still pointed to the same output, you could take exclusive locks on > both), or if it locks the underlying resource.
I'm pretty sure it's the underlying resource that gets locked. The man page is not quite explicit but implicitly fairly clear. The opening paragraph says: "Apply, test or remove a POSIX lock on a section of an open file. The file is specified by fd, a file descriptor open for writing...". David
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