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Re: RFC: locking policy for Debian

Christian Schwarz <schwarz@monet.m.isar.de> writes:

> AFAIK, the only way to lock a file (even reliable over NFS) is to create
> another file with a unique filename, e.g. foo.lock-ipaddress-processid,
> and create a link say to foo.lock. The "link" function is atomic per
> definition, even via NFS and will fail if the file already exists. Is this
> correct?

Almost.  link(2) is atomic, but it can fail and still return a
succesful return code.  It's necessary to check the file with stat(2)


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