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package seccomp
import (
"errors"
"io"
"os"
"syscall"
)
func Export(opts SyscallOpts) (f *os.File, err error) {
if f, err = tmpfile(); err != nil {
return
}
if err = exportFilter(f.Fd(), opts); err != nil {
return
}
_, err = f.Seek(0, io.SeekStart)
return
}
/*
An Encoder writes a BPF program to an output stream.
Methods of Encoder are not safe for concurrent use.
An Encoder must not be copied after first use.
*/
type Encoder struct {
*exporter
}
func (e *Encoder) Read(p []byte) (n int, err error) {
if err = e.prepare(); err != nil {
return
}
return e.r.Read(p)
}
func (e *Encoder) Close() error {
if e.r == nil {
return syscall.EINVAL
}
// this hangs if the cgo thread fails to exit
return errors.Join(e.closeWrite(), <-e.exportErr)
}
// New returns an inactive Encoder instance.
func New(opts SyscallOpts) *Encoder {
return &Encoder{newExporter(opts)}
}
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