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// Copyright 2018 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 (
"syscall"
"gvisor.dev/gvisor/pkg/abi/linux"
"gvisor.dev/gvisor/pkg/sentry/arch"
"gvisor.dev/gvisor/pkg/sentry/kernel"
)
const (
onlyScheduler = linux.SCHED_NORMAL
onlyPriority = 0
)
// SchedParam replicates struct sched_param in sched.h.
type SchedParam struct {
schedPriority int64
}
// SchedGetparam implements linux syscall sched_getparam(2).
func SchedGetparam(t *kernel.Task, args arch.SyscallArguments) (uintptr, *kernel.SyscallControl, error) {
pid := args[0].Int()
param := args[1].Pointer()
if param == 0 {
return 0, nil, syscall.EINVAL
}
if pid < 0 {
return 0, nil, syscall.EINVAL
}
if pid != 0 && t.PIDNamespace().TaskWithID(kernel.ThreadID(pid)) == nil {
return 0, nil, syscall.ESRCH
}
r := SchedParam{schedPriority: onlyPriority}
if _, err := t.CopyOut(param, r); err != nil {
return 0, nil, err
}
return 0, nil, nil
}
// SchedGetscheduler implements linux syscall sched_getscheduler(2).
func SchedGetscheduler(t *kernel.Task, args arch.SyscallArguments) (uintptr, *kernel.SyscallControl, error) {
pid := args[0].Int()
if pid < 0 {
return 0, nil, syscall.EINVAL
}
if pid != 0 && t.PIDNamespace().TaskWithID(kernel.ThreadID(pid)) == nil {
return 0, nil, syscall.ESRCH
}
return onlyScheduler, nil, nil
}
// SchedSetscheduler implements linux syscall sched_setscheduler(2).
func SchedSetscheduler(t *kernel.Task, args arch.SyscallArguments) (uintptr, *kernel.SyscallControl, error) {
pid := args[0].Int()
policy := args[1].Int()
param := args[2].Pointer()
if pid < 0 {
return 0, nil, syscall.EINVAL
}
if policy != onlyScheduler {
return 0, nil, syscall.EINVAL
}
if pid != 0 && t.PIDNamespace().TaskWithID(kernel.ThreadID(pid)) == nil {
return 0, nil, syscall.ESRCH
}
var r SchedParam
if _, err := t.CopyIn(param, &r); err != nil {
return 0, nil, syscall.EINVAL
}
if r.schedPriority != onlyPriority {
return 0, nil, syscall.EINVAL
}
return 0, nil, nil
}
// SchedGetPriorityMax implements linux syscall sched_get_priority_max(2).
func SchedGetPriorityMax(t *kernel.Task, args arch.SyscallArguments) (uintptr, *kernel.SyscallControl, error) {
return onlyPriority, nil, nil
}
// SchedGetPriorityMin implements linux syscall sched_get_priority_min(2).
func SchedGetPriorityMin(t *kernel.Task, args arch.SyscallArguments) (uintptr, *kernel.SyscallControl, error) {
return onlyPriority, nil, nil
}
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