43 lines
1.5 KiB
Go
43 lines
1.5 KiB
Go
// Copyright 2018 Google Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package linux
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import (
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"gvisor.googlesource.com/gvisor/pkg/abi/linux"
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"gvisor.googlesource.com/gvisor/pkg/sentry/arch"
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"gvisor.googlesource.com/gvisor/pkg/sentry/kernel"
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"gvisor.googlesource.com/gvisor/pkg/sentry/usage"
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)
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// Sysinfo implements the sysinfo syscall as described in man 2 sysinfo.
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func Sysinfo(t *kernel.Task, args arch.SyscallArguments) (uintptr, *kernel.SyscallControl, error) {
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addr := args[0].Pointer()
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mem := t.Kernel().Platform.Memory()
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mem.UpdateUsage()
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_, totalUsage := usage.MemoryAccounting.Copy()
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totalSize := usage.TotalMemory(mem.TotalSize(), totalUsage)
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// Only a subset of the fields in sysinfo_t make sense to return.
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si := linux.Sysinfo{
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Procs: uint16(len(t.PIDNamespace().Tasks())),
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Uptime: t.Kernel().MonotonicClock().Now().Seconds(),
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TotalRAM: totalSize,
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FreeRAM: totalSize - totalUsage,
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}
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_, err := t.CopyOut(addr, si)
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return 0, nil, err
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}
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