Brooks Davis 3076591b7a Attempt to use AT_PS_STRINGS to get the ps_strings pointer.
This saves a system call and avoids one of the (relatively rare) cases
of the kernel exporting pointers via sysctl.

As a temporary measure, keep the sysctl support to allow limited
compatability with old kernels.

Fail gracefully if ps_strings can't be found (should never happen).

Reviewed by:	kib
Obtained from:	CheriBSD
Sponsored by:	DARPA
Differential Revision:	https://reviews.freebsd.org/D24407
2020-04-15 20:28:20 +00:00
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