mirror of
https://github.com/hanzoai/visor.git
synced 2026-09-24 17:04:14 +00:00
Etienne PerotandgVisor bot
da6948a692
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
99 lines
2.6 KiB
Go
99 lines
2.6 KiB
Go
// Copyright 2021 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/kernel/mq"
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)
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// MqOpen implements mq_open(2).
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func MqOpen(t *kernel.Task, sysno uintptr, args arch.SyscallArguments) (uintptr, *kernel.SyscallControl, error) {
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nameAddr := args[0].Pointer()
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flag := args[1].Int()
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mode := args[2].ModeT()
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attrAddr := args[3].Pointer()
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name, err := t.CopyInString(nameAddr, mq.MaxName)
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if err != nil {
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return 0, nil, err
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}
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rOnly := flag&linux.O_RDONLY == linux.O_RDONLY
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wOnly := flag&linux.O_WRONLY == linux.O_WRONLY
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readWrite := flag&linux.O_RDWR == linux.O_RDWR
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create := flag&linux.O_CREAT == linux.O_CREAT
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exclusive := flag&linux.O_EXCL == linux.O_EXCL
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block := flag&linux.O_NONBLOCK != linux.O_NONBLOCK
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var attr linux.MqAttr
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var attrPtr *linux.MqAttr
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if attrAddr != 0 {
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if _, err := attr.CopyIn(t, attrAddr); err != nil {
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return 0, nil, err
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}
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attrPtr = &attr
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}
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opts := openOpts(name, rOnly, wOnly, readWrite, create, exclusive, block)
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r := t.IPCNamespace().PosixQueues()
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queue, err := r.FindOrCreate(t, opts, linux.FileMode(mode), attrPtr)
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if err != nil {
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return 0, nil, err
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}
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fd, err := t.NewFDFrom(0, queue, kernel.FDFlags{
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CloseOnExec: flag&linux.O_CLOEXEC != 0,
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})
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if err != nil {
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return 0, nil, err
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}
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return uintptr(fd), nil, nil
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}
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// MqUnlink implements mq_unlink(2).
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func MqUnlink(t *kernel.Task, sysno uintptr, args arch.SyscallArguments) (uintptr, *kernel.SyscallControl, error) {
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nameAddr := args[0].Pointer()
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name, err := t.CopyInString(nameAddr, mq.MaxName)
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if err != nil {
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return 0, nil, err
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}
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return 0, nil, t.IPCNamespace().PosixQueues().Remove(t, name)
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}
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func openOpts(name string, rOnly, wOnly, readWrite, create, exclusive, block bool) mq.OpenOpts {
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var access mq.AccessType
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switch {
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case readWrite:
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access = mq.ReadWrite
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case wOnly:
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access = mq.WriteOnly
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case rOnly:
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access = mq.ReadOnly
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}
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return mq.OpenOpts{
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Name: name,
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Access: access,
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Create: create,
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Exclusive: exclusive,
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Block: block,
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}
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}
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