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os: use wait6 to avoid wait/kill race on freebsd

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This change is a followup to https://go-review.googlesource.com/23967
for FreeBSD.

Updates #13987.
Updates #16028.

Change-Id: I0f0737372fce6df89d090fe9847305749b79eb4c
Reviewed-on: https://go-review.googlesource.com/24021
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This commit is contained in:
Mikio Hara 2016-06-11 19:55:34 +09:00
parent ccd9a55609
commit 5d876e3e2e
2 changed files with 47 additions and 1 deletions
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2
src/os/wait_unimp.go
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@ -2,7 +2,7 @@
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// +build dragonfly freebsd nacl netbsd openbsd solaris
// +build dragonfly nacl netbsd openbsd solaris
package os

46
src/os/wait_wait6.go Normal file
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@ -0,0 +1,46 @@
// 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.
// +build freebsd
package os
import (
"runtime"
"syscall"
)
const _P_PID = 0
// blockUntilWaitable attempts to block until a call to p.Wait will
// succeed immediately, and returns whether it has done so.
// It does not actually call p.Wait.
func (p *Process) blockUntilWaitable() (bool, error) {
var errno syscall.Errno
switch runtime.GOARCH {
case "386", "arm":
// The arguments on 32-bit FreeBSD look like the
// following:
// - freebsd32_wait6_args{ idtype, id1, id2, status, options, wrusage, info } or
// - freebsd32_wait6_args{ idtype, pad, id1, id2, status, options, wrusage, info } when PAD64_REQUIRED=1 on MIPS or PowerPC
_, _, errno = syscall.Syscall9(syscall.SYS_WAIT6, _P_PID, 0, uintptr(p.Pid), 0, syscall.WEXITED|syscall.WNOWAIT, 0, 0, 0, 0)
default:
_, _, errno = syscall.Syscall6(syscall.SYS_WAIT6, _P_PID, uintptr(p.Pid), 0, syscall.WEXITED|syscall.WNOWAIT, 0, 0)
}
if errno != 0 {
// The wait6 system call is supported only on FreeBSD
// 9.3 and above, so it may return an ENOSYS error.
// Also the system call may return an ECHILD error
// when the child process has not finished the
// transformation using execve system call.
// In both cases, we just leave the care of child
// process to the following wait4 system call in
// Process.wait.
if errno == syscall.ENOSYS || errno == syscall.ECHILD {
return false, nil
}
return false, NewSyscallError("wait6", errno)
}
return true, nil
}