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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 (
"gvisor.dev/gvisor/pkg/abi/linux"
"gvisor.dev/gvisor/pkg/sentry/arch"
"gvisor.dev/gvisor/pkg/sentry/kernel"
"gvisor.dev/gvisor/pkg/sentry/usage"
)
// Sysinfo implements the sysinfo syscall as described in man 2 sysinfo.
func Sysinfo(t *kernel.Task, args arch.SyscallArguments) (uintptr, *kernel.SyscallControl, error) {
addr := args[0].Pointer()
mf := t.Kernel().MemoryFile()
mfUsage, err := mf.TotalUsage()
if err != nil {
return 0, nil, err
}
memStats, _ := usage.MemoryAccounting.Copy()
totalUsage := mfUsage + memStats.Mapped
totalSize := usage.TotalMemory(mf.TotalSize(), totalUsage)
memFree := totalSize - totalUsage
if memFree > totalSize {
// Underflow.
memFree = 0
}
// Only a subset of the fields in sysinfo_t make sense to return.
si := linux.Sysinfo{
Procs: uint16(t.Kernel().TaskSet().Root.NumTasks()),
Uptime: t.Kernel().MonotonicClock().Now().Seconds(),
TotalRAM: totalSize,
FreeRAM: memFree,
Unit: 1,
}
_, err = si.CopyOut(t, addr)
return 0, nil, err
}
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