wait_wait6.go

     1  // Copyright 2016 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  //go:build dragonfly || freebsd || netbsd
     6  
     7  package os
     8  
     9  import (
    10  	"runtime"
    11  	"syscall"
    12  )
    13  
    14  // blockUntilWaitable attempts to block until a call to p.Wait will
    15  // succeed immediately, and reports whether it has done so.
    16  // It does not actually call p.Wait.
    17  func (p *Process) blockUntilWaitable() (bool, error) {
    18  	var errno syscall.Errno
    19  	for {
    20  		_, errno = wait6(_P_PID, p.Pid, syscall.WEXITED|syscall.WNOWAIT)
    21  		if errno != syscall.EINTR {
    22  			break
    23  		}
    24  	}
    25  	runtime.KeepAlive(p)
    26  	if errno == syscall.ENOSYS {
    27  		return false, nil
    28  	} else if errno != 0 {
    29  		return false, NewSyscallError("wait6", errno)
    30  	}
    31  	return true, nil
    32  }
    33
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