prefork is a utility to prefork inetd-style wait services which itself runs as an inetd-style wait service. prefork expects to be passed file descriptor zero (0) as a listening socket on which accept(2) can be called and will spawn children, passing them file descriptor zero (0) under the expectation that these children will service the incoming connexions. The children should then service connexions by calling accept(2) on the socket.
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Binary packages can be installed with the high-level tool pkgin (which can be installed with pkg_add) or pkg_add(1) (installed by default). The NetBSD packages collection is also designed to permit easy installation from source.
The pkg_admin audit command locates any installed package which has been mentioned in security advisories as having vulnerabilities.
Please note the vulnerabilities database might not be fully accurate, and not every bug is exploitable with every configuration.
Problem reports, updates or suggestions for this package should be reported with send-pr.