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Denys Vlasenko
ec1ea163376
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Denys Vlasenko committed 3720a61daf209 Oct 2016
ifupdown: rewrite state file atomically

By user's request.
Decided to not use fcntl(F_SETLKW) in lieu of problems with locking
on networked filesystems. The existence of /var/run/ifstate.new
is treated as a write lock. rename() provides atomicity.

function                                             old     new   delta
ifupdown_main                                       1019    1122    +103

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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