import (
	"bytes"
	"internal/testenv"
	"io"
	"os"
	"os/exec"
	"runtime"
	"runtime/debug"
	"strings"
	"sync"
	"syscall"
	"testing"
	"time"
	"unsafe"
)

func init() {
	if runtime.Sigisblocked(int(syscall.SIGQUIT)) {
		// We can't use SIGQUIT to kill subprocesses because
		// it's blocked. Use SIGKILL instead. See issue
		// #19196 for an example of when this happens.
		testenv.Sigquit = syscall.SIGKILL
	}
}

var NonblockingPipe = nonblockingPipe
var Fcntl = fcntl
var Closeonexec = closeonexec

func sigismember(mask *sigset, i int) bool {
	clear := *mask
	sigdelset(&clear, i)
	return clear != *mask
}

func Sigisblocked(i int) bool {
	var sigmask sigset
	sigprocmask(_SIG_SETMASK, nil, &sigmask)
	return sigismember(&sigmask, i)
}

type M = m

var waitForSigusr1 struct {
	rdpipe int32
	wrpipe int32
	mID    int64