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// Copyright 2016 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 dragonfly || freebsd || netbsd
package os
import (
"runtime"
"syscall"
)
// blockUntilWaitable attempts to block until a call to p.Wait will
// succeed immediately, and reports whether it has done so.
// It does not actually call p.Wait.
func (p *Process) blockUntilWaitable() (bool, error) {
var errno syscall.Errno
for {
_, errno = wait6(_P_PID, p.Pid, syscall.WEXITED|syscall.WNOWAIT)
if errno != syscall.EINTR {
break
}
}
runtime.KeepAlive(p)
if errno == syscall.ENOSYS {
return false, nil
} else if errno != 0 {
return false, NewSyscallError("wait6", errno)
}
return true, nil
}