83 lines
1.7 KiB
Go
83 lines
1.7 KiB
Go
// 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.
|
|
|
|
// +build aix darwin dragonfly freebsd linux nacl netbsd openbsd solaris
|
|
|
|
package time
|
|
|
|
import (
|
|
"errors"
|
|
"syscall"
|
|
)
|
|
|
|
// for testing: whatever interrupts a sleep
|
|
func interrupt() {
|
|
syscall.Kill(syscall.Getpid(), syscall.SIGCHLD)
|
|
}
|
|
|
|
// readFile reads and returns the content of the named file.
|
|
// It is a trivial implementation of ioutil.ReadFile, reimplemented
|
|
// here to avoid depending on io/ioutil or os.
|
|
// It returns an error if name exceeds maxFileSize bytes.
|
|
func readFile(name string) ([]byte, error) {
|
|
f, err := syscall.Open(name, syscall.O_RDONLY, 0)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
defer syscall.Close(f)
|
|
var (
|
|
buf [4096]byte
|
|
ret []byte
|
|
n int
|
|
)
|
|
for {
|
|
n, err = syscall.Read(f, buf[:])
|
|
if n > 0 {
|
|
ret = append(ret, buf[:n]...)
|
|
}
|
|
if n == 0 || err != nil {
|
|
break
|
|
}
|
|
if len(ret) > maxFileSize {
|
|
return nil, fileSizeError(name)
|
|
}
|
|
}
|
|
return ret, err
|
|
}
|
|
|
|
func open(name string) (uintptr, error) {
|
|
fd, err := syscall.Open(name, syscall.O_RDONLY, 0)
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
return uintptr(fd), nil
|
|
}
|
|
|
|
func closefd(fd uintptr) {
|
|
syscall.Close(int(fd))
|
|
}
|
|
|
|
func preadn(fd uintptr, buf []byte, off int) error {
|
|
whence := seekStart
|
|
if off < 0 {
|
|
whence = seekEnd
|
|
}
|
|
if _, err := syscall.Seek(int(fd), int64(off), whence); err != nil {
|
|
return err
|
|
}
|
|
for len(buf) > 0 {
|
|
m, err := syscall.Read(int(fd), buf)
|
|
if m <= 0 {
|
|
if err == nil {
|
|
return errors.New("short read")
|
|
}
|
|
return err
|
|
}
|
|
buf = buf[m:]
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func isNotExist(err error) bool { return err == syscall.ENOENT }
|