The ID Creation File (Obsolete As of V5.62): nf
Old versions of sendmail used an
nf file when
creating a message identifier to avoid race
conditions.[178] But contemporary versions of
sendmail create the queue
identifier when first creating the qf file. The nf file is
obsolete.
[178] * Historical footnote: this stems from the days when the only atomic filesystem call was link(2).
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