wait_waitid.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  // We used to use this code for Darwin, but according to issue #19314
     6  // waitid returns if the process is stopped, even when using WEXITED.
     7  
     8  //go:build linux
     9  
    10  package os
    11  
    12  import (
    13  	"internal/syscall/unix"
    14  	"runtime"
    15  	"syscall"
    16  )
    17  
    18  // blockUntilWaitable attempts to block until a call to p.Wait will
    19  // succeed immediately, and reports whether it has done so.
    20  // It does not actually call p.Wait.
    21  func (p *Process) blockUntilWaitable() (bool, error) {
    22  	var info unix.SiginfoChild
    23  	err := ignoringEINTR(func() error {
    24  		return unix.Waitid(unix.P_PID, p.Pid, &info, syscall.WEXITED|syscall.WNOWAIT, nil)
    25  	})
    26  	runtime.KeepAlive(p)
    27  	if err != nil {
    28  		// waitid has been available since Linux 2.6.9, but
    29  		// reportedly is not available in Ubuntu on Windows.
    30  		// See issue 16610.
    31  		if err == syscall.ENOSYS {
    32  			return false, nil
    33  		}
    34  		return false, NewSyscallError("waitid", err)
    35  	}
    36  	return true, nil
    37  }
    38
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