github.com/prattmic/llgo-embedded@v0.0.0-20150820070356-41cfecea0e1e/third_party/gofrontend/libgo/go/net/fd_poll_nacl.go (about)

     1  // Copyright 2013 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  	"syscall"
     9  	"time"
    10  )
    11  
    12  type pollDesc struct {
    13  	fd      *netFD
    14  	closing bool
    15  }
    16  
    17  func (pd *pollDesc) Init(fd *netFD) error { pd.fd = fd; return nil }
    18  
    19  func (pd *pollDesc) Close() {}
    20  
    21  func (pd *pollDesc) Lock() {}
    22  
    23  func (pd *pollDesc) Unlock() {}
    24  
    25  func (pd *pollDesc) Wakeup() {}
    26  
    27  func (pd *pollDesc) Evict() bool {
    28  	pd.closing = true
    29  	if pd.fd != nil {
    30  		syscall.StopIO(pd.fd.sysfd)
    31  	}
    32  	return false
    33  }
    34  
    35  func (pd *pollDesc) Prepare(mode int) error {
    36  	if pd.closing {
    37  		return errClosing
    38  	}
    39  	return nil
    40  }
    41  
    42  func (pd *pollDesc) PrepareRead() error { return pd.Prepare('r') }
    43  
    44  func (pd *pollDesc) PrepareWrite() error { return pd.Prepare('w') }
    45  
    46  func (pd *pollDesc) Wait(mode int) error {
    47  	if pd.closing {
    48  		return errClosing
    49  	}
    50  	return errTimeout
    51  }
    52  
    53  func (pd *pollDesc) WaitRead() error { return pd.Wait('r') }
    54  
    55  func (pd *pollDesc) WaitWrite() error { return pd.Wait('w') }
    56  
    57  func (pd *pollDesc) WaitCanceled(mode int) {}
    58  
    59  func (pd *pollDesc) WaitCanceledRead() {}
    60  
    61  func (pd *pollDesc) WaitCanceledWrite() {}
    62  
    63  func (fd *netFD) setDeadline(t time.Time) error {
    64  	return setDeadlineImpl(fd, t, 'r'+'w')
    65  }
    66  
    67  func (fd *netFD) setReadDeadline(t time.Time) error {
    68  	return setDeadlineImpl(fd, t, 'r')
    69  }
    70  
    71  func (fd *netFD) setWriteDeadline(t time.Time) error {
    72  	return setDeadlineImpl(fd, t, 'w')
    73  }
    74  
    75  func setDeadlineImpl(fd *netFD, t time.Time, mode int) error {
    76  	d := t.UnixNano()
    77  	if t.IsZero() {
    78  		d = 0
    79  	}
    80  	if err := fd.incref(); err != nil {
    81  		return err
    82  	}
    83  	switch mode {
    84  	case 'r':
    85  		syscall.SetReadDeadline(fd.sysfd, d)
    86  	case 'w':
    87  		syscall.SetWriteDeadline(fd.sysfd, d)
    88  	case 'r' + 'w':
    89  		syscall.SetReadDeadline(fd.sysfd, d)
    90  		syscall.SetWriteDeadline(fd.sysfd, d)
    91  	}
    92  	fd.decref()
    93  	return nil
    94  }