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PiperOrigin-RevId: 194583126
Change-Id: Ica1d8821a90f74e7e745962d71801c598c652463

1 files changed, 79 insertions, 0 deletions

diff --git a/pkg/sentry/arch/signal_act.go b/pkg/sentry/arch/signal_act.go
new file mode 100644
index 000000000..36437b965
--- /dev/null
+++ b/pkg/sentry/arch/signal_act.go
@@ -0,0 +1,79 @@
+// 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 arch
+
+// Special values for SignalAct.Handler.
+const (
+	// SignalActDefault is SIG_DFL and specifies that the default behavior for
+	// a signal should be taken.
+	SignalActDefault = 0
+
+	// SignalActIgnore is SIG_IGN and specifies that a signal should be
+	// ignored.
+	SignalActIgnore = 1
+)
+
+// Available signal flags.
+const (
+	SignalFlagNoCldStop    = 0x00000001
+	SignalFlagNoCldWait    = 0x00000002
+	SignalFlagSigInfo      = 0x00000004
+	SignalFlagRestorer     = 0x04000000
+	SignalFlagOnStack      = 0x08000000
+	SignalFlagRestart      = 0x10000000
+	SignalFlagInterrupt    = 0x20000000
+	SignalFlagNoDefer      = 0x40000000
+	SignalFlagResetHandler = 0x80000000
+)
+
+// IsSigInfo returns true iff this handle expects siginfo.
+func (s SignalAct) IsSigInfo() bool {
+	return s.Flags&SignalFlagSigInfo != 0
+}
+
+// IsNoDefer returns true iff this SignalAct has the NoDefer flag set.
+func (s SignalAct) IsNoDefer() bool {
+	return s.Flags&SignalFlagNoDefer != 0
+}
+
+// IsRestart returns true iff this SignalAct has the Restart flag set.
+func (s SignalAct) IsRestart() bool {
+	return s.Flags&SignalFlagRestart != 0
+}
+
+// IsResetHandler returns true iff this SignalAct has the ResetHandler flag set.
+func (s SignalAct) IsResetHandler() bool {
+	return s.Flags&SignalFlagResetHandler != 0
+}
+
+// IsOnStack returns true iff this SignalAct has the OnStack flag set.
+func (s SignalAct) IsOnStack() bool {
+	return s.Flags&SignalFlagOnStack != 0
+}
+
+// HasRestorer returns true iff this SignalAct has the Restorer flag set.
+func (s SignalAct) HasRestorer() bool {
+	return s.Flags&SignalFlagRestorer != 0
+}
+
+// NativeSignalAct is a type that is equivalent to struct sigaction in the
+// guest architecture.
+type NativeSignalAct interface {
+	// SerializeFrom copies the data in the host SignalAct s into this object.
+	SerializeFrom(s *SignalAct)
+
+	// DeserializeTo copies the data in this object into the host SignalAct s.
+	DeserializeTo(s *SignalAct)
+}