glog: don't use SIGABRT on platforms that don't support signals

cl/517387773 (google-internal)

glog.go

@@ -92,7 +92,6 @@ import (
 	"strconv"
 	"sync"
 	"sync/atomic"
-	"syscall"
 	"time"
 
 	"github.com/golang/glog/internal/logsink"
@@ -524,34 +523,6 @@ func fatalf(depth int, format string, args ...any) {
 	os.Exit(2) // Exit with the same code as the default SIGABRT handler.
 }
 
-// abortProcess attempts to kill the current process in a way that will dump the
-// currently-running goroutines someplace useful (Coroner or stderr).
-//
-// It does this by sending SIGABRT to the current process. Unfortunately, the
-// signal may or may not be delivered to the current thread; in order to do that
-// portably, we would need to add a cgo dependency and call pthread_kill.
-//
-// If successful, abortProcess does not return.
-func abortProcess() error {
-	p, err := os.FindProcess(os.Getpid())
-	if err != nil {
-		return err
-	}
-	if err := p.Signal(syscall.SIGABRT); err != nil {
-		return err
-	}
-
-	// Sent the signal.  Now we wait for it to arrive and any SIGABRT handlers to
-	// run (and eventually terminate the process themselves).
-	//
-	// We could just "select{}" here, but there's an outside chance that would
-	// trigger the runtime's deadlock detector if there happen not to be any
-	// background goroutines running.  So we'll sleep a while first to give
-	// the signal some time.
-	time.Sleep(10 * time.Second)
-	select {}
-}
-
 // Fatal logs to the FATAL, ERROR, WARNING, and INFO logs,
 // including a stack trace of all running goroutines, then calls os.Exit(2).
 // Arguments are handled in the manner of fmt.Print; a newline is appended if missing.

glog_file_linux.go

@@ -0,0 +1,39 @@
+// Go support for leveled logs, analogous to https://github.com/google/glog.
+//
+// Copyright 2023 Google Inc. All Rights Reserved.
+//
+// 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.
+
+//go:build linux
+
+package glog
+
+import (
+	"errors"
+	"runtime"
+	"syscall"
+)
+
+// abortProcess attempts to kill the current process in a way that will dump the
+// currently-running goroutines someplace useful (like stderr).
+//
+// It does this by sending SIGABRT to the current thread.
+//
+// If successful, abortProcess does not return.
+func abortProcess() error {
+	runtime.LockOSThread()
+	if err := syscall.Tgkill(syscall.Getpid(), syscall.Gettid(), syscall.SIGABRT); err != nil {
+		return err
+	}
+	return errors.New("log: killed current thread with SIGABRT, but still running")
+}

glog_file_other.go

@@ -0,0 +1,30 @@
+// Go support for leveled logs, analogous to https://github.com/google/glog.
+//
+// Copyright 2023 Google Inc. All Rights Reserved.
+//
+// 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.
+
+//go:build !(unix || windows)
+
+package glog
+
+import (
+	"fmt"
+	"runtime"
+)
+
+// abortProcess returns an error on platforms that presumably don't support signals.
+func abortProcess() error {
+	return fmt.Errorf("not sending SIGABRT (%s/%s does not support signals), falling back", runtime.GOOS, runtime.GOARCH)
+
+}

glog_file_posix.go

@@ -0,0 +1,53 @@
+// Go support for leveled logs, analogous to https://github.com/google/glog.
+//
+// Copyright 2023 Google Inc. All Rights Reserved.
+//
+// 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.
+
+//go:build (unix || windows) && !linux
+
+package glog
+
+import (
+	"os"
+	"syscall"
+	"time"
+)
+
+// abortProcess attempts to kill the current process in a way that will dump the
+// currently-running goroutines someplace useful (like stderr).
+//
+// It does this by sending SIGABRT to the current process. Unfortunately, the
+// signal may or may not be delivered to the current thread; in order to do that
+// portably, we would need to add a cgo dependency and call pthread_kill.
+//
+// If successful, abortProcess does not return.
+func abortProcess() error {
+	p, err := os.FindProcess(os.Getpid())
+	if err != nil {
+		return err
+	}
+	if err := p.Signal(syscall.SIGABRT); err != nil {
+		return err
+	}
+
+	// Sent the signal.  Now we wait for it to arrive and any SIGABRT handlers to
+	// run (and eventually terminate the process themselves).
+	//
+	// We could just "select{}" here, but there's an outside chance that would
+	// trigger the runtime's deadlock detector if there happen not to be any
+	// background goroutines running.  So we'll sleep a while first to give
+	// the signal some time.
+	time.Sleep(10 * time.Second)
+	select {}
+}