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package linux
import (
"os"
"golang.org/x/sys/unix"
"github.com/lxc/incus/v6/shared/revert"
)
// CreateMemfd creates a new memfd for the provided byte slice.
func CreateMemfd(content []byte) (*os.File, error) {
reverter := revert.New()
defer reverter.Fail()
// Create the memfd.
fd, err := unix.MemfdCreate("memfd", unix.MFD_CLOEXEC)
if err != nil {
return nil, err
}
reverter.Add(func() { _ = unix.Close(fd) })
// Set its size.
err = unix.Ftruncate(fd, int64(len(content)))
if err != nil {
return nil, err
}
// Prepare the storage.
data, err := unix.Mmap(fd, 0, len(content), unix.PROT_READ|unix.PROT_WRITE, unix.MAP_SHARED)
if err != nil {
return nil, err
}
// Write the content.
copy(data, content)
// Cleanup.
err = unix.Munmap(data)
if err != nil {
return nil, err
}
reverter.Success()
return os.NewFile(uintptr(fd), "memfd"), nil
}
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