init

.gitattributes

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+*.js linguist-language=GO
+*.css linguist-language=GO
+*.html linguist-language=GO

.gitignore

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+.buildpath
+.hgignore.swp
+.project
+.orig
+.swp
+.idea/
+.settings/
+.vscode/
+vender/
+log/
+composer.lock
+gitpush.sh
+pkg/
+bin/
+cbuild
+**/.DS_Store
+.vscode/
+go.sum
+

LICENSE

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+MIT License
+
+Copyright (c) 2017 [email protected] https://goframe.org
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.MD

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+# greuseport [![Go Doc](https://godoc.org/github.com/gogf/greuseport?status.svg)](https://godoc.org/github.com/gogf/greuseport) [![Documents](https://img.shields.io/badge/docs-100%25-green.svg)](https://goframe.org) [![License](https://img.shields.io/github/license/gogf/greuseport.svg?style=flat)](https://github.com/gogf/greuseport) [![Language](https://img.shields.io/badge/language-go-blue.svg)](https://github.com/gogf/greuseport) [![Release](https://img.shields.io/github/release/gogf/greuseport.svg?style=flat)](https://github.com/gogf/greuseport/releases)
+
+Package greuseport provides Listen and Dial functions that set socket options in order to be able to reuse ports. You should only use this package if you know what SO_REUSEADDR and SO_REUSEPORT are.
+
+# Installation
+```
+go get -u github.com/gogf/greuseport
+```
+or use `go.mod`
+```
+require github.com/gogf/greuseport latest
+```
+
+# Documentation
+
+* [https://godoc.org/github.com/gogf/greuseport](https://godoc.org/github.com/gogf/greuseport)
+
+# Quick Start
+```go
+package main
+
+import (
+    "fmt"
+    "github.com/gogf/greuseport"
+    "net/http"
+    "os"
+)
+
+// We can create two processes with this code.
+// Do some requests, then watch the output of the console.
+func main() {
+    listener, err := greuseport.Listen("tcp", ":8881")
+    if err != nil {
+        panic(err)
+    }
+    defer listener.Close()
+
+    server := &http.Server{}
+    http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
+        fmt.Fprintf(w, "gid: %d, pid: %d\n", os.Getgid(), os.Getpid())
+    })
+
+    panic(server.Serve(listener))
+}
+```
+
+
+# License
+
+`greuseport` is licensed under the [MIT License](LICENSE), 100% free and open-source, forever.
+

go.mod

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+module github.com/gogf/greuseport

greuseport.go

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+// Package greuseport provides Listen and Dial functions that set socket
+// options in order to be able to reuse ports. You should only use this
+// package if you know what SO_REUSEADDR and SO_REUSEPORT are.
+//
+// For example:
+//
+//  // listen on the same port.
+//  l1, _ := reuse.Listen("tcp", "127.0.0.1:1234")
+//  l2, _ := reuse.Listen("tcp", "127.0.0.1:1234")
+//
+//  // dial from the same port.
+//  l1, _ := reuse.Listen("tcp", "127.0.0.1:1234")
+//  l2, _ := reuse.Listen("tcp", "127.0.0.1:1235")
+//  c, _ := reuse.Dial("tcp", "127.0.0.1:1234", "127.0.0.1:1235")
+//
+// Note: cant dial self because tcp/ip stacks use 4-tuples to identify connections,
+// and doing so would clash.
+package greuseport
+
+import (
+	"context"
+	"net"
+)
+
+var (
+	Enabled      = false
+	listenConfig = net.ListenConfig {
+		Control: Control,
+	}
+)
+
+// Listen listens at the given network and address. see net.Listen
+// Returns a net.Listener created from a file discriptor for a socket
+// with SO_REUSEPORT and SO_REUSEADDR option set.
+func Listen(network, address string) (net.Listener, error) {
+	return listenConfig.Listen(context.Background(), network, address)
+}
+
+// ListenPacket listens at the given network and address. see net.ListenPacket
+// Returns a net.Listener created from a file discriptor for a socket
+// with SO_REUSEPORT and SO_REUSEADDR option set.
+func ListenPacket(network, address string) (net.PacketConn, error) {
+	return listenConfig.ListenPacket(context.Background(), network, address)
+}
+
+// Dial dials the given network and address. see net.Dialer.Dial
+// Returns a net.Conn created from a file discriptor for a socket
+// with SO_REUSEPORT and SO_REUSEADDR option set.
+func Dial(network, laddr, raddr string) (net.Conn, error) {
+	nla, err := ResolveAddr(network, laddr)
+	if err != nil {
+		return nil, err
+	}
+	d := net.Dialer {
+		Control:   Control,
+		LocalAddr: nla,
+	}
+	return d.Dial(network, raddr)
+}

greuseport_addr.go

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+package greuseport
+
+import (
+	"net"
+)
+
+func ResolveAddr(network, address string) (net.Addr, error) {
+	switch network {
+		case "ip", "ip4", "ip6":
+			return net.ResolveIPAddr(network, address)
+		case "tcp", "tcp4", "tcp6":
+			return net.ResolveTCPAddr(network, address)
+		case "udp", "udp4", "udp6":
+			return net.ResolveUDPAddr(network, address)
+		case "unix", "unixgram", "unixpacket":
+			return net.ResolveUnixAddr(network, address)
+        default:
+            return nil, net.UnknownNetworkError(network)
+	}
+}

greuseport_other.go

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+// +build !windows,!linux,!darwin,!dragonfly,!freebsd,!netbsd,!openbsd
+
+package greuseport
+
+import (
+    "syscall"
+)
+
+// See net.RawConn.Control
+func Control(network, address string, c syscall.RawConn) (err error) {
+	return nil
+}

greuseport_unix.go

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+// +build linux darwin dragonfly freebsd netbsd openbsd
+
+package greuseport
+
+import (
+    "github.com/gogf/gf/third/golang.org/x/sys/unix"
+    "syscall"
+)
+
+func init() {
+    Enabled = true
+}
+
+// See net.RawConn.Control
+func Control(network, address string, c syscall.RawConn) (err error) {
+	c.Control(func(fd uintptr) {
+		if err = unix.SetsockoptInt(int(fd), unix.SOL_SOCKET, unix.SO_REUSEADDR, 1); err != nil {
+            panic(err)
+		    return
+		}
+		if err = unix.SetsockoptInt(int(fd), unix.SOL_SOCKET, unix.SO_REUSEPORT, 1); err != nil {
+			panic(err)
+		    return
+		}
+
+	})
+	return
+}

greuseport_windows.go

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+// +build windows
+
+package greuseport
+
+import (
+    "github.com/gogf/gf/third/golang.org/x/sys/windows"
+    "syscall"
+)
+
+// See net.RawConn.Control
+func Control(network, address string, c syscall.RawConn) (err error) {
+	return c.Control(func(fd uintptr) {
+        if err = windows.SetsockoptInt(windows.Handle(fd), windows.SOL_SOCKET, windows.SO_REUSEADDR, 1); err != nil {
+            return
+        }
+	})
+}