github.com/peggyl/go@v0.0.0-20151008231540-ae315999c2d5/src/time/sys_windows.go (about)

     1  // Copyright 2011 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 time
     6  
     7  import (
     8  	"errors"
     9  	"syscall"
    10  )
    11  
    12  // for testing: whatever interrupts a sleep
    13  func interrupt() {
    14  }
    15  
    16  // readFile reads and returns the content of the named file.
    17  // It is a trivial implementation of ioutil.ReadFile, reimplemented
    18  // here to avoid depending on io/ioutil or os.
    19  func readFile(name string) ([]byte, error) {
    20  	f, err := syscall.Open(name, syscall.O_RDONLY, 0)
    21  	if err != nil {
    22  		return nil, err
    23  	}
    24  	defer syscall.Close(f)
    25  	var (
    26  		buf [4096]byte
    27  		ret []byte
    28  		n   int
    29  	)
    30  	for {
    31  		n, err = syscall.Read(f, buf[:])
    32  		if n > 0 {
    33  			ret = append(ret, buf[:n]...)
    34  		}
    35  		if n == 0 || err != nil {
    36  			break
    37  		}
    38  	}
    39  	return ret, err
    40  }
    41  
    42  func open(name string) (uintptr, error) {
    43  	fd, err := syscall.Open(name, syscall.O_RDONLY, 0)
    44  	if err != nil {
    45  		return 0, err
    46  	}
    47  	return uintptr(fd), nil
    48  }
    49  
    50  func closefd(fd uintptr) {
    51  	syscall.Close(syscall.Handle(fd))
    52  }
    53  
    54  func preadn(fd uintptr, buf []byte, off int) error {
    55  	whence := 0
    56  	if off < 0 {
    57  		whence = 2
    58  	}
    59  	if _, err := syscall.Seek(syscall.Handle(fd), int64(off), whence); err != nil {
    60  		return err
    61  	}
    62  	for len(buf) > 0 {
    63  		m, err := syscall.Read(syscall.Handle(fd), buf)
    64  		if m <= 0 {
    65  			if err == nil {
    66  				return errors.New("short read")
    67  			}
    68  			return err
    69  		}
    70  		buf = buf[m:]
    71  	}
    72  	return nil
    73  }