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Diffstat (limited to 'pkg/sentry/socket/unix/io.go')
-rw-r--r--pkg/sentry/socket/unix/io.go13
1 files changed, 13 insertions, 0 deletions
diff --git a/pkg/sentry/socket/unix/io.go b/pkg/sentry/socket/unix/io.go
index 2ec1a662d..2447f24ef 100644
--- a/pkg/sentry/socket/unix/io.go
+++ b/pkg/sentry/socket/unix/io.go
@@ -83,6 +83,19 @@ type EndpointReader struct {
ControlTrunc bool
}
+// Truncate calls RecvMsg on the endpoint without writing to a destination.
+func (r *EndpointReader) Truncate() error {
+ // Ignore bytes read since it will always be zero.
+ _, ms, c, ct, err := r.Endpoint.RecvMsg(r.Ctx, [][]byte{}, r.Creds, r.NumRights, r.Peek, r.From)
+ r.Control = c
+ r.ControlTrunc = ct
+ r.MsgSize = ms
+ if err != nil {
+ return err.ToError()
+ }
+ return nil
+}
+
// ReadToBlocks implements safemem.Reader.ReadToBlocks.
func (r *EndpointReader) ReadToBlocks(dsts safemem.BlockSeq) (uint64, error) {
return safemem.FromVecReaderFunc{func(bufs [][]byte) (int64, error) {