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// Copyright 2009 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.

// For systems with the waitpid library call.

package syscall

//sys   waitpid(pid Pid_t, status *int, options int) (wpid Pid_t, err error)

//waitpid(pid Pid_t, status *int, options int) Pid_t

func Wait4(pid int, wstatus *WaitStatus, options int, rusage *Rusage) (wpid int, err error) {

        var status int

        r, err := waitpid(Pid_t(pid), &status, options)

        wpid = int(r)

        if wstatus != nil {

                *wstatus = WaitStatus(status)

        }

        return

}