if err != nil {
		return "", nil, err
	}

	closeCh := make(chan struct{})
	addr := filepath.Join(p, "server.sock")
	teardown := func() {
		close(closeCh)
		os.RemoveAll(addr)
	}

	listener, err := net.Listen("unix", addr)
	if err != nil {
		teardown()
		return "", nil, err
	}

	s := grpc.NewServer()
	switch version {
	case v1alpha3Version:
		fakeGRPCServer := &fakeV1alpha3GRPCServer{}

				Name:         "https",
				Protocol:     protocol.HTTPS,
				ServicePort:  443,
				WorkloadPort: 8443,
				TLS:          true,
			},
		},
		// Set up TLS certs on the server. This will make the server listen with these credentials.
		TLSSettings: &common.TLSSettings{
			// Echo has these test certs baked into the docker image
			RootCert:   mustReadCert("root-cert.pem"),
			ClientCert: mustReadCert("cert-chain.pem"),

	flag.BindEnv(fs, constants.RestoreFormat, "f", "Print iptables rules in iptables-restore interpretable format.",
		&cfg.RestoreFormat)

	flag.BindEnv(fs, constants.IptablesProbePort, "", "Set listen port for failure detection.", &cfg.IptablesProbePort)

	flag.BindEnv(fs, constants.ProbeTimeout, "", "Failure detection timeout.", &cfg.ProbeTimeout)

* Providing user-specific information (e.g., authentication credentials)
* Defining machine-specific details (e.g., JDK locations)
* Registering build listeners (e.g., external tools that wish to listen to Gradle events might find this helpful)
* Registering loggers (e.g., customize how Gradle logs the events that it generates)

    * Here we pass the class that Gunicorn can import and use with:

        ```Python
        import uvicorn.workers.UvicornWorker
        ```

* `--bind`: This tells Gunicorn the IP and the port to listen to, using a colon (`:`) to separate the IP and the port.
    * If you were running Uvicorn directly, instead of `--bind 0.0.0.0:80` (the Gunicorn option) you would use `--host 0.0.0.0` and `--port 80`.

package net

import (
	"context"
	"internal/bytealg"
	"runtime"
	"sync"
	_ "unsafe" // for linkname
)

// BUG(rsc,mikio): On DragonFly BSD and OpenBSD, listening on the
// "tcp" and "udp" networks does not listen for both IPv4 and IPv6
// connections. This is due to the fact that IPv4 traffic will not be
// routed to an IPv6 socket - two separate sockets are required if
// both address families are to be supported.