1 files changed, 119 insertions, 0 deletions
diff --git a/src/net/file_unix.go b/src/net/file_unix.go
new file mode 100644
index 0000000..0df67db
--- /dev/null
+++ b/src/net/file_unix.go
@@ -0,0 +1,119 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build unix
+
+package net
+
+import (
+	"internal/poll"
+	"os"
+	"syscall"
+)
+
+func dupSocket(f *os.File) (int, error) {
+	s, call, err := poll.DupCloseOnExec(int(f.Fd()))
+	if err != nil {
+		if call != "" {
+			err = os.NewSyscallError(call, err)
+		}
+		return -1, err
+	}
+	if err := syscall.SetNonblock(s, true); err != nil {
+		poll.CloseFunc(s)
+		return -1, os.NewSyscallError("setnonblock", err)
+	}
+	return s, nil
+}
+
+func newFileFD(f *os.File) (*netFD, error) {
+	s, err := dupSocket(f)
+	if err != nil {
+		return nil, err
+	}
+	family := syscall.AF_UNSPEC
+	sotype, err := syscall.GetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_TYPE)
+	if err != nil {
+		poll.CloseFunc(s)
+		return nil, os.NewSyscallError("getsockopt", err)
+	}
+	lsa, _ := syscall.Getsockname(s)
+	rsa, _ := syscall.Getpeername(s)
+	switch lsa.(type) {
+	case *syscall.SockaddrInet4:
+		family = syscall.AF_INET
+	case *syscall.SockaddrInet6:
+		family = syscall.AF_INET6
+	case *syscall.SockaddrUnix:
+		family = syscall.AF_UNIX
+	default:
+		poll.CloseFunc(s)
+		return nil, syscall.EPROTONOSUPPORT
+	}
+	fd, err := newFD(s, family, sotype, "")
+	if err != nil {
+		poll.CloseFunc(s)
+		return nil, err
+	}
+	laddr := fd.addrFunc()(lsa)
+	raddr := fd.addrFunc()(rsa)
+	fd.net = laddr.Network()
+	if err := fd.init(); err != nil {
+		fd.Close()
+		return nil, err
+	}
+	fd.setAddr(laddr, raddr)
+	return fd, nil
+}
+
+func fileConn(f *os.File) (Conn, error) {
+	fd, err := newFileFD(f)
+	if err != nil {
+		return nil, err
+	}
+	switch fd.laddr.(type) {
+	case *TCPAddr:
+		return newTCPConn(fd), nil
+	case *UDPAddr:
+		return newUDPConn(fd), nil
+	case *IPAddr:
+		return newIPConn(fd), nil
+	case *UnixAddr:
+		return newUnixConn(fd), nil
+	}
+	fd.Close()
+	return nil, syscall.EINVAL
+}
+
+func fileListener(f *os.File) (Listener, error) {
+	fd, err := newFileFD(f)
+	if err != nil {
+		return nil, err
+	}
+	switch laddr := fd.laddr.(type) {
+	case *TCPAddr:
+		return &TCPListener{fd: fd}, nil
+	case *UnixAddr:
+		return &UnixListener{fd: fd, path: laddr.Name, unlink: false}, nil
+	}
+	fd.Close()
+	return nil, syscall.EINVAL
+}
+
+func filePacketConn(f *os.File) (PacketConn, error) {
+	fd, err := newFileFD(f)
+	if err != nil {
+		return nil, err
+	}
+	switch fd.laddr.(type) {
+	case *UDPAddr:
+		return newUDPConn(fd), nil
+	case *IPAddr:
+		return newIPConn(fd), nil
+	case *UnixAddr:
+		return newUnixConn(fd), nil
+	}
+	fd.Close()
+	return nil, syscall.EINVAL
+}