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@@ -1,3 +1,25 @@
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+/*
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+ Copyright (c) 2019-2020 Bruce A Henderson
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+
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+ This software is provided 'as-is', without any express or implied
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+ warranty. In no event will the authors be held liable for any damages
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+ arising from the use of this software.
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+
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+ Permission is granted to anyone to use this software for any purpose,
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+ including commercial applications, and to alter it and redistribute it
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+ freely, subject to the following restrictions:
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+
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+ 1. The origin of this software must not be misrepresented; you must not
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+ claim that you wrote the original software. If you use this software
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+ in a product, an acknowledgment in the product documentation would be
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+ appreciated but is not required.
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+
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+ 2. Altered source versions must be plainly marked as such, and must not be
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+ misrepresented as being the original software.
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+
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+ 3. This notice may not be removed or altered from any source
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+ distribution.
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+*/
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#include <unistd.h>
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#include <sys/sysctl.h>
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