blob: 9568423557f1a434a60c8eda1b6c1b49012bce89 (
plain)
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
|
package seccomp
import (
"os"
"runtime"
"sync"
)
type exporter struct {
opts SyscallOpts
r, w *os.File
prepareOnce sync.Once
prepareErr error
closeOnce sync.Once
closeErr error
exportErr <-chan error
}
func (e *exporter) prepare() error {
e.prepareOnce.Do(func() {
if r, w, err := os.Pipe(); err != nil {
e.prepareErr = err
return
} else {
e.r, e.w = r, w
}
ec := make(chan error, 1)
go func(fd uintptr) {
ec <- buildFilter(int(fd), e.opts)
close(ec)
_ = e.closeWrite()
runtime.KeepAlive(e.w)
}(e.w.Fd())
e.exportErr = ec
runtime.SetFinalizer(e, (*exporter).closeWrite)
})
return e.prepareErr
}
func (e *exporter) closeWrite() error {
e.closeOnce.Do(func() {
if e.w == nil {
panic("closeWrite called on invalid exporter")
}
e.closeErr = e.w.Close()
// no need for a finalizer anymore
runtime.SetFinalizer(e, nil)
})
return e.closeErr
}
func newExporter(opts SyscallOpts) *exporter {
return &exporter{opts: opts}
}
|
