Make fewer syscalls#117

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daurnimator wants to merge 17 commits intowahern:masterfrom

daurnimator:less-syscalls

Commits on Jan 6, 2016

src/lib/socket.c: If SOCK_NONBLOCK and/or SOCK_CLOEXEC are defined; use them in so_socket
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src/lib/socket.c: Only call 'SETFL' if 'GETFL' doesn't return what we wanted
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src/lib/socket.c: Only call 'SETFD' if 'GETFD' doesn't return what we wanted
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src/socket.c: Pass SOCK_NONBLOCK and SOCK_CLOEXEC to socketpair if possible
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src/lib/socket: ftype can fill in only what is unknown
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src/lib/socket.c: Skip so_ftype call when information already available
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src/lib/socket.c: Assume natural state of newly created socket is all flags off
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src/socket.c: reuseaddr can be turned off by default for sockets that will connect
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src/cqueues: Only call kevent() once
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Commits on Nov 2, 2016

Commits on Jun 2, 2018

src/cqueues.c: Only move threads to pending queue when their events of interest occur
daurnimator
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