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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.
// We used to use this code for Darwin, but according to issue #19314
// waitid returns if the process is stopped, even when using WEXITED.
//go:build linux
package os
import (
"internal/syscall/unix"
"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 info unix.SiginfoChild
err := ignoringEINTR(func() error {
return unix.Waitid(unix.P_PID, p.Pid, &info, syscall.WEXITED|syscall.WNOWAIT, nil)
})
runtime.KeepAlive(p)
if err != nil {
// waitid has been available since Linux 2.6.9, but
// reportedly is not available in Ubuntu on Windows.
// See issue 16610.
if err == syscall.ENOSYS {
return false, nil
}
return false, NewSyscallError("waitid", err)
}
return true, nil
}
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