1 files changed, 148 insertions, 0 deletions
diff --git a/pkg/sentry/strace/signal.go b/pkg/sentry/strace/signal.go
new file mode 100644
index 000000000..f82460e1c
--- /dev/null
+++ b/pkg/sentry/strace/signal.go
@@ -0,0 +1,148 @@
+// Copyright 2018 The gVisor Authors.
+//
+// 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",
+}
+
+var sigActionFlags = abi.FlagSet{
+	{
+		Flag: linux.SA_NOCLDSTOP,
+		Name: "SA_NOCLDSTOP",
+	},
+	{
+		Flag: linux.SA_NOCLDWAIT,
+		Name: "SA_NOCLDWAIT",
+	},
+	{
+		Flag: linux.SA_SIGINFO,
+		Name: "SA_SIGINFO",
+	},
+	{
+		Flag: linux.SA_RESTORER,
+		Name: "SA_RESTORER",
+	},
+	{
+		Flag: linux.SA_ONSTACK,
+		Name: "SA_ONSTACK",
+	},
+	{
+		Flag: linux.SA_RESTART,
+		Name: "SA_RESTART",
+	},
+	{
+		Flag: linux.SA_NODEFER,
+		Name: "SA_NODEFER",
+	},
+	{
+		Flag: linux.SA_RESETHAND,
+		Name: "SA_RESETHAND",
+	},
+}
+
+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[:]))
+
+	return fmt.Sprintf("%#x %s", addr, formatSigSet(set))
+}
+
+func formatSigSet(set linux.SignalSet) string {
+	var signals []string
+	linux.ForEachSignal(set, func(sig linux.Signal) {
+		signals = append(signals, signalNames.ParseDecimal(uint64(sig)))
+	})
+
+	return fmt.Sprintf("[%v]", strings.Join(signals, " "))
+}
+
+func sigAction(t *kernel.Task, addr usermem.Addr) string {
+	if addr == 0 {
+		return "null"
+	}
+
+	sa, err := t.CopyInSignalAct(addr)
+	if err != nil {
+		return fmt.Sprintf("%#x (error copying sigaction: %v)", addr, err)
+	}
+
+	var handler string
+	switch sa.Handler {
+	case linux.SIG_IGN:
+		handler = "SIG_IGN"
+	case linux.SIG_DFL:
+		handler = "SIG_DFL"
+	default:
+		handler = fmt.Sprintf("%#x", sa.Handler)
+	}
+
+	return fmt.Sprintf("%#x {Handler: %s, Flags: %s, Restorer: %#x, Mask: %s}", addr, handler, sigActionFlags.Parse(sa.Flags), sa.Restorer, formatSigSet(sa.Mask))
+}