74 lines
1.4 KiB
Go
74 lines
1.4 KiB
Go
// Copyright 2011 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package time
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import (
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"errors"
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"syscall"
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)
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// for testing: whatever interrupts a sleep
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func interrupt() {
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}
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// readFile reads and returns the content of the named file.
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// It is a trivial implementation of ioutil.ReadFile, reimplemented
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// here to avoid depending on io/ioutil or os.
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func readFile(name string) ([]byte, error) {
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f, err := syscall.Open(name, syscall.O_RDONLY, 0)
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if err != nil {
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return nil, err
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}
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defer syscall.Close(f)
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var (
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buf [4096]byte
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ret []byte
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n int
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)
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for {
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n, err = syscall.Read(f, buf[:])
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if n > 0 {
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ret = append(ret, buf[:n]...)
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}
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if n == 0 || err != nil {
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break
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}
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}
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return ret, err
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}
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func open(name string) (uintptr, error) {
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fd, err := syscall.Open(name, syscall.O_RDONLY, 0)
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if err != nil {
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return 0, err
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}
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return uintptr(fd), nil
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}
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func closefd(fd uintptr) {
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syscall.Close(syscall.Handle(fd))
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}
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func preadn(fd uintptr, buf []byte, off int) error {
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whence := seekStart
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if off < 0 {
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whence = seekEnd
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}
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if _, err := syscall.Seek(syscall.Handle(fd), int64(off), whence); err != nil {
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return err
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}
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for len(buf) > 0 {
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m, err := syscall.Read(syscall.Handle(fd), buf)
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if m <= 0 {
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if err == nil {
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return errors.New("short read")
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}
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return err
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}
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buf = buf[m:]
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}
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return nil
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}
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