Edward Tomasz Napierala 8d113f4aec Don't call stat(2) on nsswitch.conf(5) every time nsdispatch(3)
and dependent functions (eg getpwname(3)) get called. This can
improve performance of binaries that perform a lot of name
lookups, such as gssd(8). It also matches documented behaviour
of Linux and Solaris.

The old code is left in place, should anyone need it, guarded
by #ifdef NS_REREAD_CONF.

Reviewed by:	imp, bcr
MFC after:	2 weeks
Relnotes:	yes
Sponsored by:	DARPA, AFRL
Differential Revision:	https://reviews.freebsd.org/D17934
2018-11-10 23:07:46 +00:00
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