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// Copyright 2019 The gVisor Authors.
//
// 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 linux
import (
"gvisor.dev/gvisor/pkg/abi/linux"
"gvisor.dev/gvisor/pkg/sentry/arch"
"gvisor.dev/gvisor/pkg/sentry/kernel"
"gvisor.dev/gvisor/pkg/syserror"
)
// RSeq implements syscall rseq(2).
func RSeq(t *kernel.Task, args arch.SyscallArguments) (uintptr, *kernel.SyscallControl, error) {
addr := args[0].Pointer()
length := args[1].Uint()
flags := args[2].Int()
signature := args[3].Uint()
if !t.RSeqAvailable() {
// Event for applications that want rseq on a configuration
// that doesn't support them.
t.Kernel().EmitUnimplementedEvent(t)
return 0, nil, syserror.ENOSYS
}
switch flags {
case 0:
// Register.
return 0, nil, t.SetRSeq(addr, length, signature)
case linux.RSEQ_FLAG_UNREGISTER:
return 0, nil, t.ClearRSeq(addr, length, signature)
default:
// Unknown flag.
return 0, nil, syserror.EINVAL
}
}
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