pkg syscall (darwin-arm64), const IPPROTO_APES = 99
pkg syscall (darwin-arm64), const IPPROTO_APES ideal-int
pkg syscall (darwin-arm64), const IPPROTO_ARGUS = 13
pkg syscall (darwin-arm64), const IPPROTO_ARGUS ideal-int
pkg syscall (darwin-arm64), const IPPROTO_AX25 = 93
pkg syscall (darwin-arm64), const IPPROTO_AX25 ideal-int
pkg syscall (darwin-arm64), const IPPROTO_BHA = 49

</p>

<h2 id="Notation">Notation</h2>
<p>
The syntax is specified using a
<a href="https://en.wikipedia.org/wiki/Wirth_syntax_notation">variant</a>
of Extended Backus-Naur Form (EBNF):
</p>

<pre class="grammar">
Syntax      = { Production } .
Production  = production_name "=" [ Expression ] "." .
Expression  = Term { "|" Term } .
Term        = Factor { Factor } .