Konstantin Belousov 677258f7e7 Add procctl(2) PROC_TRACE_CTL command to enable or disable debugger
attachment to the process.  Note that the command is not intended to
be a security measure, rather it is an obfuscation feature,
implemented for parity with other operating systems.

Discussed with:	jilles, rwatson
Man page fixes by:	rwatson
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
2015-01-18 15:13:11 +00:00
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