mirror of
https://github.com/netbirdio/gvisor.git
synced 2026-05-22 17:12:49 -07:00
Etienne Perot
44e2d0fcfe
This will be used to plumb the syscall number through to a counter metric that exports the number of times an unimplemented syscall has been called. Plenty of syscall implementations call `EmitUnimplementedEvent` for flags and settings that are not implemented. With `sysno` available, they will be able to plumb that bit of information through. PiperOrigin-RevId: 518635831
53 lines
1.6 KiB
Go
53 lines
1.6 KiB
Go
// Copyright 2018 The gVisor Authors.
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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.dev/gvisor/pkg/abi/linux"
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"gvisor.dev/gvisor/pkg/sentry/arch"
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"gvisor.dev/gvisor/pkg/sentry/kernel"
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"gvisor.dev/gvisor/pkg/sentry/usage"
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)
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// Sysinfo implements Linux syscall sysinfo(2).
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func Sysinfo(t *kernel.Task, sysno uintptr, args arch.SyscallArguments) (uintptr, *kernel.SyscallControl, error) {
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addr := args[0].Pointer()
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mf := t.Kernel().MemoryFile()
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mfUsage, err := mf.TotalUsage()
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if err != nil {
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return 0, nil, err
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}
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memStats, _ := usage.MemoryAccounting.Copy()
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totalUsage := mfUsage + memStats.Mapped
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totalSize := usage.TotalMemory(mf.TotalSize(), totalUsage)
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memFree := totalSize - totalUsage
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if memFree > totalSize {
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// Underflow.
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memFree = 0
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}
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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(t.Kernel().TaskSet().Root.NumTasks()),
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Uptime: t.Kernel().MonotonicClock().Now().Seconds(),
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TotalRAM: totalSize,
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FreeRAM: memFree,
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Unit: 1,
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}
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_, err = si.CopyOut(t, addr)
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return 0, nil, err
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}
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