const syscall.SO_KEEPALIVE

2 uses

	syscall (current package)
		zerrors_darwin_amd64.go#L951: 	SO_KEEPALIVE                      = 0x8

	net
		sockopt_posix.go#L117: 	err := fd.pfd.SetsockoptInt(syscall.SOL_SOCKET, syscall.SO_KEEPALIVE, boolint(keepalive))

The pages are generated with Golds v0.3.2-preview. (GOOS=darwin GOARCH=amd64)
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