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// Copyright 2020 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 vfs2
import (
"gvisor.dev/gvisor/pkg/abi/linux"
"gvisor.dev/gvisor/pkg/sentry/arch"
"gvisor.dev/gvisor/pkg/sentry/kernel"
"gvisor.dev/gvisor/pkg/syserror"
)
// Ioctl implements Linux syscall ioctl(2).
func Ioctl(t *kernel.Task, args arch.SyscallArguments) (uintptr, *kernel.SyscallControl, error) {
fd := args[0].Int()
file := t.GetFileVFS2(fd)
if file == nil {
return 0, nil, syserror.EBADF
}
defer file.DecRef()
// Handle ioctls that apply to all FDs.
switch args[1].Int() {
case linux.FIONCLEX:
t.FDTable().SetFlagsVFS2(fd, kernel.FDFlags{
CloseOnExec: false,
})
return 0, nil, nil
case linux.FIOCLEX:
t.FDTable().SetFlagsVFS2(fd, kernel.FDFlags{
CloseOnExec: true,
})
return 0, nil, nil
case linux.FIONBIO:
var set int32
if _, err := t.CopyIn(args[2].Pointer(), &set); err != nil {
return 0, nil, err
}
flags := file.StatusFlags()
if set != 0 {
flags |= linux.O_NONBLOCK
} else {
flags &^= linux.O_NONBLOCK
}
return 0, nil, file.SetStatusFlags(t, t.Credentials(), flags)
case linux.FIOASYNC:
var set int32
if _, err := t.CopyIn(args[2].Pointer(), &set); err != nil {
return 0, nil, err
}
flags := file.StatusFlags()
if set != 0 {
flags |= linux.O_ASYNC
} else {
flags &^= linux.O_ASYNC
}
file.SetStatusFlags(t, t.Credentials(), flags)
return 0, nil, nil
case linux.FIOGETOWN, linux.SIOCGPGRP:
var who int32
owner, hasOwner := getAsyncOwner(t, file)
if hasOwner {
if owner.Type == linux.F_OWNER_PGRP {
who = -owner.PID
} else {
who = owner.PID
}
}
_, err := t.CopyOut(args[2].Pointer(), &who)
return 0, nil, err
case linux.FIOSETOWN, linux.SIOCSPGRP:
var who int32
if _, err := t.CopyIn(args[2].Pointer(), &who); err != nil {
return 0, nil, err
}
ownerType := int32(linux.F_OWNER_PID)
if who < 0 {
// Check for overflow before flipping the sign.
if who-1 > who {
return 0, nil, syserror.EINVAL
}
ownerType = linux.F_OWNER_PGRP
who = -who
}
return 0, nil, setAsyncOwner(t, file, ownerType, who)
}
ret, err := file.Ioctl(t, t.MemoryManager(), args)
return ret, nil, err
}
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