Drop privileges on OpenBSD #38
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Only allow stdio access while handling data from the network. AFAIK, with this change the program will only compile on OpenBSD; further work would be needed to make this cross-platform.
This changes how we invoke OpenBSD's pledge(2) to drop privileges after initialization, using conditional compilation so we can still build on platforms where pledge is not available.
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On OpenBSD, use pledge(2) to drop unneeded privileges after initialization.