tcpsock_plan9.go

     1  // Copyright 2009 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package net
     6  
     7  import (
     8  	"context"
     9  	"io"
    10  	"os"
    11  )
    12  
    13  func (c *TCPConn) readFrom(r io.Reader) (int64, error) {
    14  	return genericReadFrom(c, r)
    15  }
    16  
    17  func (sd *sysDialer) dialTCP(ctx context.Context, laddr, raddr *TCPAddr) (*TCPConn, error) {
    18  	if testHookDialTCP != nil {
    19  		return testHookDialTCP(ctx, sd.network, laddr, raddr)
    20  	}
    21  	return sd.doDialTCP(ctx, laddr, raddr)
    22  }
    23  
    24  func (sd *sysDialer) doDialTCP(ctx context.Context, laddr, raddr *TCPAddr) (*TCPConn, error) {
    25  	switch sd.network {
    26  	case "tcp4":
    27  		// Plan 9 doesn't complain about [::]:0->127.0.0.1, so it's up to us.
    28  		if laddr != nil && len(laddr.IP) != 0 && laddr.IP.To4() == nil {
    29  			return nil, &AddrError{Err: "non-IPv4 local address", Addr: laddr.String()}
    30  		}
    31  	case "tcp", "tcp6":
    32  	default:
    33  		return nil, UnknownNetworkError(sd.network)
    34  	}
    35  	if raddr == nil {
    36  		return nil, errMissingAddress
    37  	}
    38  	fd, err := dialPlan9(ctx, sd.network, laddr, raddr)
    39  	if err != nil {
    40  		return nil, err
    41  	}
    42  	return newTCPConn(fd), nil
    43  }
    44  
    45  func (ln *TCPListener) ok() bool { return ln != nil && ln.fd != nil && ln.fd.ctl != nil }
    46  
    47  func (ln *TCPListener) accept() (*TCPConn, error) {
    48  	fd, err := ln.fd.acceptPlan9()
    49  	if err != nil {
    50  		return nil, err
    51  	}
    52  	tc := newTCPConn(fd)
    53  	if ln.lc.KeepAlive >= 0 {
    54  		setKeepAlive(fd, true)
    55  		ka := ln.lc.KeepAlive
    56  		if ln.lc.KeepAlive == 0 {
    57  			ka = defaultTCPKeepAlive
    58  		}
    59  		setKeepAlivePeriod(fd, ka)
    60  	}
    61  	return tc, nil
    62  }
    63  
    64  func (ln *TCPListener) close() error {
    65  	if err := ln.fd.pfd.Close(); err != nil {
    66  		return err
    67  	}
    68  	if _, err := ln.fd.ctl.WriteString("hangup"); err != nil {
    69  		ln.fd.ctl.Close()
    70  		return err
    71  	}
    72  	if err := ln.fd.ctl.Close(); err != nil {
    73  		return err
    74  	}
    75  	return nil
    76  }
    77  
    78  func (ln *TCPListener) file() (*os.File, error) {
    79  	f, err := ln.dup()
    80  	if err != nil {
    81  		return nil, err
    82  	}
    83  	return f, nil
    84  }
    85  
    86  func (sl *sysListener) listenTCP(ctx context.Context, laddr *TCPAddr) (*TCPListener, error) {
    87  	fd, err := listenPlan9(ctx, sl.network, laddr)
    88  	if err != nil {
    89  		return nil, err
    90  	}
    91  	return &TCPListener{fd: fd, lc: sl.ListenConfig}, nil
    92  }
    93
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