1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
|
// Copyright 2018 Google Inc.
//
// 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.googlesource.com/gvisor/pkg/abi/linux"
"gvisor.googlesource.com/gvisor/pkg/sentry/arch"
"gvisor.googlesource.com/gvisor/pkg/sentry/fs"
"gvisor.googlesource.com/gvisor/pkg/sentry/fs/timerfd"
"gvisor.googlesource.com/gvisor/pkg/sentry/kernel"
"gvisor.googlesource.com/gvisor/pkg/sentry/kernel/kdefs"
ktime "gvisor.googlesource.com/gvisor/pkg/sentry/kernel/time"
"gvisor.googlesource.com/gvisor/pkg/syserror"
)
// TimerfdCreate implements Linux syscall timerfd_create(2).
func TimerfdCreate(t *kernel.Task, args arch.SyscallArguments) (uintptr, *kernel.SyscallControl, error) {
clockID := args[0].Int()
flags := args[1].Int()
if flags&^(linux.TFD_CLOEXEC|linux.TFD_NONBLOCK) != 0 {
return 0, nil, syserror.EINVAL
}
var c ktime.Clock
switch clockID {
case linux.CLOCK_REALTIME:
c = t.Kernel().RealtimeClock()
case linux.CLOCK_MONOTONIC:
c = t.Kernel().MonotonicClock()
default:
return 0, nil, syserror.EINVAL
}
f := timerfd.NewFile(t, c)
defer f.DecRef()
f.SetFlags(fs.SettableFileFlags{
NonBlocking: flags&linux.TFD_NONBLOCK != 0,
})
fd, err := t.FDMap().NewFDFrom(0, f, kernel.FDFlags{
CloseOnExec: flags&linux.TFD_CLOEXEC != 0,
}, t.ThreadGroup().Limits())
if err != nil {
return 0, nil, err
}
return uintptr(fd), nil, nil
}
// TimerfdSettime implements Linux syscall timerfd_settime(2).
func TimerfdSettime(t *kernel.Task, args arch.SyscallArguments) (uintptr, *kernel.SyscallControl, error) {
fd := kdefs.FD(args[0].Int())
flags := args[1].Int()
newValAddr := args[2].Pointer()
oldValAddr := args[3].Pointer()
if flags&^(linux.TFD_TIMER_ABSTIME) != 0 {
return 0, nil, syserror.EINVAL
}
f := t.FDMap().GetFile(fd)
if f == nil {
return 0, nil, syserror.EBADF
}
defer f.DecRef()
tf, ok := f.FileOperations.(*timerfd.TimerOperations)
if !ok {
return 0, nil, syserror.EINVAL
}
var newVal linux.Itimerspec
if _, err := t.CopyIn(newValAddr, &newVal); err != nil {
return 0, nil, err
}
var s ktime.Setting
var err error
if flags&linux.TFD_TIMER_ABSTIME != 0 {
s, err = ktime.SettingFromAbsSpec(ktime.FromTimespec(newVal.Value),
newVal.Interval.ToDuration())
} else {
s, err = ktime.SettingFromSpec(newVal.Value.ToDuration(),
newVal.Interval.ToDuration(), tf.Clock())
}
if err != nil {
return 0, nil, err
}
valueNS, intervalNS := ktime.SpecFromSetting(tf.SetTime(s))
if oldValAddr == 0 {
return 0, nil, nil
}
oldVal := linux.Itimerspec{
Interval: linux.DurationToTimespec(intervalNS),
Value: linux.DurationToTimespec(valueNS),
}
_, err = t.CopyOut(oldValAddr, &oldVal)
return 0, nil, err
}
// TimerfdGettime implements Linux syscall timerfd_gettime(2).
func TimerfdGettime(t *kernel.Task, args arch.SyscallArguments) (uintptr, *kernel.SyscallControl, error) {
fd := kdefs.FD(args[0].Int())
curValAddr := args[1].Pointer()
f := t.FDMap().GetFile(fd)
if f == nil {
return 0, nil, syserror.EBADF
}
defer f.DecRef()
tf, ok := f.FileOperations.(*timerfd.TimerOperations)
if !ok {
return 0, nil, syserror.EINVAL
}
valueNS, intervalNS := ktime.SpecFromSetting(tf.GetTime())
curVal := linux.Itimerspec{
Interval: linux.DurationToTimespec(intervalNS),
Value: linux.DurationToTimespec(valueNS),
}
_, err := t.CopyOut(curValAddr, &curVal)
return 0, nil, err
}
|
