1 files changed, 100 insertions, 0 deletions
diff --git a/pkg/sentry/syscalls/linux/sys_sched.go b/pkg/sentry/syscalls/linux/sys_sched.go
new file mode 100644
index 000000000..ff9e46077
--- /dev/null
+++ b/pkg/sentry/syscalls/linux/sys_sched.go
@@ -0,0 +1,100 @@
+// 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 linux
+
+import (
+	"syscall"
+
+	"gvisor.googlesource.com/gvisor/pkg/abi/linux"
+	"gvisor.googlesource.com/gvisor/pkg/sentry/arch"
+	"gvisor.googlesource.com/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
+}