1 files changed, 86 insertions, 0 deletions
diff --git a/pkg/sentry/strace/signal.go b/pkg/sentry/strace/signal.go
new file mode 100644
index 000000000..00ed02a3c
--- /dev/null
+++ b/pkg/sentry/strace/signal.go
@@ -0,0 +1,86 @@
+// Copyright 2018 Google LLC
+//
+// 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 strace
+
+import (
+	"fmt"
+	"strings"
+
+	"gvisor.googlesource.com/gvisor/pkg/abi"
+	"gvisor.googlesource.com/gvisor/pkg/abi/linux"
+	"gvisor.googlesource.com/gvisor/pkg/sentry/kernel"
+	"gvisor.googlesource.com/gvisor/pkg/sentry/usermem"
+)
+
+// signalNames contains the names of all named signals.
+var signalNames = abi.ValueSet{
+	uint64(linux.SIGABRT):   "SIGABRT",
+	uint64(linux.SIGALRM):   "SIGALRM",
+	uint64(linux.SIGBUS):    "SIGBUS",
+	uint64(linux.SIGCHLD):   "SIGCHLD",
+	uint64(linux.SIGCONT):   "SIGCONT",
+	uint64(linux.SIGFPE):    "SIGFPE",
+	uint64(linux.SIGHUP):    "SIGHUP",
+	uint64(linux.SIGILL):    "SIGILL",
+	uint64(linux.SIGINT):    "SIGINT",
+	uint64(linux.SIGIO):     "SIGIO",
+	uint64(linux.SIGKILL):   "SIGKILL",
+	uint64(linux.SIGPIPE):   "SIGPIPE",
+	uint64(linux.SIGPROF):   "SIGPROF",
+	uint64(linux.SIGPWR):    "SIGPWR",
+	uint64(linux.SIGQUIT):   "SIGQUIT",
+	uint64(linux.SIGSEGV):   "SIGSEGV",
+	uint64(linux.SIGSTKFLT): "SIGSTKFLT",
+	uint64(linux.SIGSTOP):   "SIGSTOP",
+	uint64(linux.SIGSYS):    "SIGSYS",
+	uint64(linux.SIGTERM):   "SIGTERM",
+	uint64(linux.SIGTRAP):   "SIGTRAP",
+	uint64(linux.SIGTSTP):   "SIGTSTP",
+	uint64(linux.SIGTTIN):   "SIGTTIN",
+	uint64(linux.SIGTTOU):   "SIGTTOU",
+	uint64(linux.SIGURG):    "SIGURG",
+	uint64(linux.SIGUSR1):   "SIGUSR1",
+	uint64(linux.SIGUSR2):   "SIGUSR2",
+	uint64(linux.SIGVTALRM): "SIGVTALRM",
+	uint64(linux.SIGWINCH):  "SIGWINCH",
+	uint64(linux.SIGXCPU):   "SIGXCPU",
+	uint64(linux.SIGXFSZ):   "SIGXFSZ",
+}
+
+var signalMaskActions = abi.ValueSet{
+	linux.SIG_BLOCK:   "SIG_BLOCK",
+	linux.SIG_UNBLOCK: "SIG_UNBLOCK",
+	linux.SIG_SETMASK: "SIG_SETMASK",
+}
+
+func sigSet(t *kernel.Task, addr usermem.Addr) string {
+	if addr == 0 {
+		return "null"
+	}
+
+	var b [linux.SignalSetSize]byte
+	if _, err := t.CopyInBytes(addr, b[:]); err != nil {
+		return fmt.Sprintf("%#x (error copying sigset: %v)", addr, err)
+	}
+
+	set := linux.SignalSet(usermem.ByteOrder.Uint64(b[:]))
+
+	var signals []string
+	linux.ForEachSignal(set, func(sig linux.Signal) {
+		signals = append(signals, signalNames.ParseDecimal(uint64(sig)))
+	})
+
+	return fmt.Sprintf("%#x [%v]", addr, strings.Join(signals, " "))
+}