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// Copyright 2018 Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package strace
import (
"gvisor.googlesource.com/gvisor/pkg/abi"
"gvisor.googlesource.com/gvisor/pkg/abi/linux"
)
// FutexCmd are the possible futex(2) commands.
var FutexCmd = abi.ValueSet{
{
Value: linux.FUTEX_WAIT,
Name: "FUTEX_WAIT",
},
{
Value: linux.FUTEX_WAKE,
Name: "FUTEX_WAKE",
},
{
Value: linux.FUTEX_FD,
Name: "FUTEX_FD",
},
{
Value: linux.FUTEX_REQUEUE,
Name: "FUTEX_REQUEUE",
},
{
Value: linux.FUTEX_CMP_REQUEUE,
Name: "FUTEX_CMP_REQUEUE",
},
{
Value: linux.FUTEX_WAKE_OP,
Name: "FUTEX_WAKE_OP",
},
{
Value: linux.FUTEX_LOCK_PI,
Name: "FUTEX_LOCK_PI",
},
{
Value: linux.FUTEX_UNLOCK_PI,
Name: "FUTEX_UNLOCK_PI",
},
{
Value: linux.FUTEX_TRYLOCK_PI,
Name: "FUTEX_TRYLOCK_PI",
},
{
Value: linux.FUTEX_WAIT_BITSET,
Name: "FUTEX_WAIT_BITSET",
},
{
Value: linux.FUTEX_WAKE_BITSET,
Name: "FUTEX_WAKE_BITSET",
},
{
Value: linux.FUTEX_WAIT_REQUEUE_PI,
Name: "FUTEX_WAIT_REQUEUE_PI",
},
{
Value: linux.FUTEX_CMP_REQUEUE_PI,
Name: "FUTEX_CMP_REQUEUE_PI",
},
}
func futex(op uint64) string {
cmd := op &^ (linux.FUTEX_PRIVATE_FLAG | linux.FUTEX_CLOCK_REALTIME)
clockRealtime := (op & linux.FUTEX_CLOCK_REALTIME) == linux.FUTEX_CLOCK_REALTIME
private := (op & linux.FUTEX_PRIVATE_FLAG) == linux.FUTEX_PRIVATE_FLAG
s := FutexCmd.Parse(cmd)
if clockRealtime {
s += "|FUTEX_CLOCK_REALTIME"
}
if private {
s += "|FUTEX_PRIVATE_FLAG"
}
return s
}
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