1 files changed, 164 insertions, 0 deletions
diff --git a/gdb-native.go b/gdb-native.go
new file mode 100644
index 0000000..a4e6189
--- /dev/null
+++ b/gdb-native.go
@@ -0,0 +1,164 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"os/exec"
+	"syscall"
+	"time"
+
+	"github.com/Sirupsen/logrus"
+	"github.com/kr/pty"
+)
+
+type GdbNative struct {
+	log   *logrus.Logger
+	ccmd  string
+	aargs []string
+	eenv  []string
+
+	exeCmd *exec.Cmd
+	fdPty  *os.File
+
+	// callbacks
+	cbOnDisconnect func(error)
+	cbRead         func(timestamp, stdout, stderr string)
+	cbInferiorRead func(timestamp, stdout, stderr string)
+	cbOnExit       func(code int, err error)
+
+	running bool
+}
+
+// NewGdbNative creates a new instance of GdbNative
+func NewGdbNative(log *logrus.Logger, args []string, env []string) *GdbNative {
+	return &GdbNative{
+		log:   log,
+		ccmd:  "/usr/bin/gdb",
+		aargs: args,
+		eenv:  env,
+	}
+}
+
+// SetConfig set additional config fields
+func (g *GdbNative) SetConfig(name string, value interface{}) error {
+	return fmt.Errorf("Unknown %s field", name)
+}
+
+// Init initializes gdb XDS
+func (g *GdbNative) Init() (int, error) {
+
+	// Create the exec command
+	g.exeCmd = exec.Command(g.ccmd, g.aargs...)
+
+	return 0, nil
+}
+
+// Close
+func (g *GdbNative) Close() error {
+	g.cbOnDisconnect = nil
+	g.cbOnExit = nil
+	g.cbRead = nil
+	g.cbInferiorRead = nil
+
+	g.running = false
+
+	return nil
+}
+
+// Start sends a request to start remotely gdb within xds-server
+func (g *GdbNative) Start(inferiorTTY bool) (int, error) {
+	var err error
+
+	// Start pty and consequently gdb process
+	if g.fdPty, err = pty.Start(g.exeCmd); err != nil {
+		return int(syscall.ESPIPE), err
+	}
+
+	g.running = true
+
+	// Monitor gdb process EOF
+	go func() {
+		// Execute command and wait EOF
+		err := g.exeCmd.Wait()
+		g.cbOnDisconnect(err)
+		g.running = false
+	}()
+
+	// Handle STDOUT
+	go func() {
+		sc := bufio.NewScanner(g.fdPty)
+		sc.Split(split)
+		for sc.Scan() {
+			if g.cbRead != nil {
+				g.cbRead(time.Now().String(), sc.Text(), "")
+			}
+			if !g.running {
+				return
+			}
+		}
+	}()
+
+	return 0, nil
+}
+
+// Cmd returns the command name
+func (g *GdbNative) Cmd() string {
+	return g.ccmd
+}
+
+// Args returns the list of arguments
+func (g *GdbNative) Args() []string {
+	return g.aargs
+}
+
+// Env returns the list of environment variables
+func (g *GdbNative) Env() []string {
+	return g.eenv
+}
+
+// OnError doesn't make sens
+func (g *GdbNative) OnError(f func(error)) {
+	// nothing to do
+}
+
+// OnDisconnect is called when stdin is disconnected
+func (g *GdbNative) OnDisconnect(f func(error)) {
+	g.cbOnDisconnect = f
+}
+
+// OnExit calls when exit event is received
+func (g *GdbNative) OnExit(f func(code int, err error)) {
+	g.cbOnExit = f
+}
+
+// Read calls when a message/string event is received on stdout or stderr
+func (g *GdbNative) Read(f func(timestamp, stdout, stderr string)) {
+	g.cbRead = f
+}
+
+// InferiorRead calls when a message/string event is received on stdout or stderr of the debugged program (IOW inferior)
+func (g *GdbNative) InferiorRead(f func(timestamp, stdout, stderr string)) {
+	g.cbInferiorRead = f
+}
+
+// Write writes message/string into gdb stdin
+func (g *GdbNative) Write(args ...interface{}) error {
+	s := fmt.Sprint(args...)
+	_, err := g.fdPty.Write([]byte(s))
+	return err
+}
+
+// SendSignal is used to send a signal to remote process/gdb
+func (g *GdbNative) SendSignal(sig os.Signal) error {
+	return g.exeCmd.Process.Signal(sig)
+}
+
+//***** Private functions *****
+
+func split(data []byte, atEOF bool) (advance int, token []byte, err error) {
+	if atEOF && len(data) == 0 {
+		return 0, nil, nil
+	}
+	return len(data), data, nil
+}