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// Copyright 2017 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.
package main
import (
"bytes"
"fmt"
"io/ioutil"
"os"
"syscall"
)
func gettid() int {
return syscall.Gettid()
}
func tidExists(tid int) (exists, supported bool) {
stat, err := ioutil.ReadFile(fmt.Sprintf("/proc/self/task/%d/stat", tid))
if os.IsNotExist(err) {
return false, true
}
// Check if it's a zombie thread.
state := bytes.Fields(stat)[2]
return !(len(state) == 1 && state[0] == 'Z'), true
}
func getcwd() (string, error) {
if !syscall.ImplementsGetwd {
return "", nil
}
// Use the syscall to get the current working directory.
// This is imperative for checking for OS thread state
// after an unshare since os.Getwd might just check the
// environment, or use some other mechanism.
var buf [4096]byte
n, err := syscall.Getcwd(buf[:])
if err != nil {
return "", err
}
// Subtract one for null terminator.
return string(buf[:n-1]), nil
}
func unshareFs() error {
err := syscall.Unshare(syscall.CLONE_FS)
if err != nil {
errno, ok := err.(syscall.Errno)
if ok && errno == syscall.EPERM {
return errNotPermitted
}
}
return err
}
func chdir(path string) error {
return syscall.Chdir(path)
}
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