Implement CatchAll and StopCatch in signal_common.go

This is part of a set of changes to port podman to the FreeBSD platform.
The pkg/signal parts are needed to enable ABI mode on FreeBSD. No tests
are needed here because it should be a functional no-op for linux.

[NO NEW TESTS NEEDED]

Signed-off-by: Doug Rabson <dfr@rabson.org>

pkg/signal/signal_common.go

@@ -2,6 +2,8 @@ package signal
 
 import (
 	"fmt"
+	"os"
+	"os/signal"
 	"strconv"
 	"strings"
 	"syscall"
@@ -39,3 +41,18 @@ func ParseSignalNameOrNumber(rawSignal string) (syscall.Signal, error) {
 	}
 	return -1, fmt.Errorf("invalid signal: %s", basename)
 }
+
+// CatchAll catches all signals and relays them to the specified channel.
+func CatchAll(sigc chan os.Signal) {
+	handledSigs := make([]os.Signal, 0, len(SignalMap))
+	for _, s := range SignalMap {
+		handledSigs = append(handledSigs, s)
+	}
+	signal.Notify(sigc, handledSigs...)
+}
+
+// StopCatch stops catching the signals and closes the specified channel.
+func StopCatch(sigc chan os.Signal) {
+	signal.Stop(sigc)
+	close(sigc)
+}

pkg/signal/signal_linux.go

@@ -9,8 +9,6 @@ package signal
 // NOTE: this package has originally been copied from github.com/docker/docker.
 
 import (
-	"os"
-	"os/signal"
 	"syscall"
 
 	"golang.org/x/sys/unix"
@@ -91,18 +89,3 @@ var SignalMap = map[string]syscall.Signal{
 	"RTMAX-1":  sigrtmax - 1,
 	"RTMAX":    sigrtmax,
 }
-
-// CatchAll catches all signals and relays them to the specified channel.
-func CatchAll(sigc chan os.Signal) {
-	handledSigs := make([]os.Signal, 0, len(SignalMap))
-	for _, s := range SignalMap {
-		handledSigs = append(handledSigs, s)
-	}
-	signal.Notify(sigc, handledSigs...)
-}
-
-// StopCatch stops catching the signals and closes the specified channel.
-func StopCatch(sigc chan os.Signal) {
-	signal.Stop(sigc)
-	close(sigc)
-}

pkg/signal/signal_linux_mipsx.go

@@ -10,8 +10,6 @@ package signal
 // NOTE: this package has originally been copied from github.com/docker/docker.
 
 import (
-	"os"
-	"os/signal"
 	"syscall"
 
 	"golang.org/x/sys/unix"
@@ -92,18 +90,3 @@ var SignalMap = map[string]syscall.Signal{
 	"RTMAX-1":  sigrtmax - 1,
 	"RTMAX":    sigrtmax,
 }
-
-// CatchAll catches all signals and relays them to the specified channel.
-func CatchAll(sigc chan os.Signal) {
-	handledSigs := make([]os.Signal, 0, len(SignalMap))
-	for _, s := range SignalMap {
-		handledSigs = append(handledSigs, s)
-	}
-	signal.Notify(sigc, handledSigs...)
-}
-
-// StopCatch stops catching the signals and closes the specified channel.
-func StopCatch(sigc chan os.Signal) {
-	signal.Stop(sigc)
-	close(sigc)
-}

pkg/signal/signal_unix.go

@@ -5,7 +5,6 @@
 package signal
 
 import (
-	"os"
 	"syscall"
 )
 
@@ -88,13 +87,3 @@ var SignalMap = map[string]syscall.Signal{
 	"RTMAX-1":  sigrtmax - 1,
 	"RTMAX":    sigrtmax,
 }
-
-// CatchAll catches all signals and relays them to the specified channel.
-func CatchAll(sigc chan os.Signal) {
-	panic("Unsupported on non-linux platforms")
-}
-
-// StopCatch stops catching the signals and closes the specified channel.
-func StopCatch(sigc chan os.Signal) {
-	panic("Unsupported on non-linux platforms")
-}

pkg/signal/signal_unsupported.go

@@ -5,7 +5,6 @@
 package signal
 
 import (
-	"os"
 	"syscall"
 )
 
@@ -88,13 +87,3 @@ var SignalMap = map[string]syscall.Signal{
 	"RTMAX-1":  sigrtmax - 1,
 	"RTMAX":    sigrtmax,
 }
-
-// CatchAll catches all signals and relays them to the specified channel.
-func CatchAll(sigc chan os.Signal) {
-	panic("Unsupported on non-linux platforms")
-}
-
-// StopCatch stops catching the signals and closes the specified channel.
-func StopCatch(sigc chan os.Signal) {
-	panic("Unsupported on non-linux platforms")
-}