return nil, syscall.EINVAL
	}
	defer p.handleTransientRelease()

	var (
		info   unix.SiginfoChild
		rusage syscall.Rusage
		e      syscall.Errno
	)
	for {
		_, _, e = syscall.Syscall6(syscall.SYS_WAITID, _P_PIDFD, handle, uintptr(unsafe.Pointer(&info)), syscall.WEXITED, uintptr(unsafe.Pointer(&rusage)), 0)
		if e != syscall.EINTR {
			break
		}
	}
	if e != 0 {
		return nil, NewSyscallError("waitid", e)
	}

	// On darwin/amd64, it requires 104 bytes.
	// We don't care about the values it returns.
	var siginfo [16]uint64
	psig := &siginfo[0]
	var e syscall.Errno
	for {
		_, _, e = syscall.Syscall6(syscall.SYS_WAITID, _P_PID, uintptr(p.Pid), uintptr(unsafe.Pointer(psig)), syscall.WEXITED|syscall.WNOWAIT, 0, 0)
		if e != syscall.EINTR {
			break
		}
	}
	runtime.KeepAlive(p)
	if e != 0 {

	SYS_ACCT                   = 89
	SYS_CAPGET                 = 90
	SYS_CAPSET                 = 91
	SYS_PERSONALITY            = 92
	SYS_EXIT                   = 93
	SYS_EXIT_GROUP             = 94
	SYS_WAITID                 = 95
	SYS_SET_TID_ADDRESS        = 96
	SYS_UNSHARE                = 97
	SYS_FUTEX                  = 98
	SYS_SET_ROBUST_LIST        = 99
	SYS_GET_ROBUST_LIST        = 100

	SYS_ACCT                   = 89
	SYS_CAPGET                 = 90
	SYS_CAPSET                 = 91
	SYS_PERSONALITY            = 92
	SYS_EXIT                   = 93
	SYS_EXIT_GROUP             = 94
	SYS_WAITID                 = 95
	SYS_SET_TID_ADDRESS        = 96
	SYS_UNSHARE                = 97
	SYS_FUTEX                  = 98
	SYS_SET_ROBUST_LIST        = 99
	SYS_GET_ROBUST_LIST        = 100

	SYS_MQ_UNLINK              = 5231
	SYS_MQ_TIMEDSEND           = 5232
	SYS_MQ_TIMEDRECEIVE        = 5233
	SYS_MQ_NOTIFY              = 5234
	SYS_MQ_GETSETATTR          = 5235
	SYS_VSERVER                = 5236
	SYS_WAITID                 = 5237
	SYS_ADD_KEY                = 5239
	SYS_REQUEST_KEY            = 5240
	SYS_KEYCTL                 = 5241
	SYS_SET_THREAD_AREA        = 5242
	SYS_INOTIFY_INIT           = 5243

	SYS_MQ_UNLINK              = 5231
	SYS_MQ_TIMEDSEND           = 5232
	SYS_MQ_TIMEDRECEIVE        = 5233
	SYS_MQ_NOTIFY              = 5234
	SYS_MQ_GETSETATTR          = 5235
	SYS_VSERVER                = 5236
	SYS_WAITID                 = 5237
	SYS_ADD_KEY                = 5239
	SYS_REQUEST_KEY            = 5240
	SYS_KEYCTL                 = 5241
	SYS_SET_THREAD_AREA        = 5242
	SYS_INOTIFY_INIT           = 5243

	SYS_MQ_UNLINK              = 241
	SYS_MQ_TIMEDSEND           = 242
	SYS_MQ_TIMEDRECEIVE        = 243
	SYS_MQ_NOTIFY              = 244
	SYS_MQ_GETSETATTR          = 245
	SYS_KEXEC_LOAD             = 246
	SYS_WAITID                 = 247
	SYS_ADD_KEY                = 248
	SYS_REQUEST_KEY            = 249
	SYS_KEYCTL                 = 250
	SYS_IOPRIO_SET             = 251
	SYS_IOPRIO_GET             = 252

	SYS_MQ_NOTIFY              = 275
	SYS_MQ_GETSETATTR          = 276
	SYS_KEXEC_LOAD             = 277
	SYS_ADD_KEY                = 278
	SYS_REQUEST_KEY            = 279
	SYS_KEYCTL                 = 280
	SYS_WAITID                 = 281
	SYS_IOPRIO_SET             = 282
	SYS_IOPRIO_GET             = 283
	SYS_INOTIFY_INIT           = 284
	SYS_INOTIFY_ADD_WATCH      = 285
	SYS_INOTIFY_RM_WATCH       = 286

	SYS_MQ_UNLINK              = 4272
	SYS_MQ_TIMEDSEND           = 4273
	SYS_MQ_TIMEDRECEIVE        = 4274
	SYS_MQ_NOTIFY              = 4275
	SYS_MQ_GETSETATTR          = 4276
	SYS_VSERVER                = 4277
	SYS_WAITID                 = 4278
	SYS_ADD_KEY                = 4280
	SYS_REQUEST_KEY            = 4281
	SYS_KEYCTL                 = 4282
	SYS_SET_THREAD_AREA        = 4283
	SYS_INOTIFY_INIT           = 4284

	SYS_MQ_OPEN                = 274
	SYS_MQ_UNLINK              = 275
	SYS_MQ_TIMEDSEND           = 276
	SYS_MQ_TIMEDRECEIVE        = 277
	SYS_MQ_NOTIFY              = 278
	SYS_MQ_GETSETATTR          = 279
	SYS_WAITID                 = 280
	SYS_SOCKET                 = 281
	SYS_BIND                   = 282
	SYS_CONNECT                = 283
	SYS_LISTEN                 = 284
	SYS_ACCEPT                 = 285