go sys_plan9 源码
golang sys_plan9 代码
文件路径：/src/time/sys_plan9.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.
//go:build plan9
package time
import (
"errors"
"syscall"
)
// for testing: whatever interrupts a sleep
func interrupt() {
// cannot predict pid, don't want to kill group
}
func open(name string) (uintptr, error) {
fd, err := syscall.Open(name, syscall.O_RDONLY)
if err != nil {
return 0, err
}
return uintptr(fd), nil
}
func read(fd uintptr, buf []byte) (int, error) {
return syscall.Read(int(fd), buf)
}
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
}
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