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authorSebastien Douheret <sebastien.douheret@iot.bzh>2017-08-07 08:49:25 +0200
committerSebastien Douheret <sebastien.douheret@iot.bzh>2017-08-07 18:01:35 +0200
commit60974e66c57cacdc2483d74718c4bb0a993d2183 (patch)
tree2722369e9cf2c7a3fb499011030fc4718f31e30f /gdb-native.go
Initial commitv0.0.1
Signed-off-by: Sebastien Douheret <sebastien.douheret@iot.bzh>
Diffstat (limited to 'gdb-native.go')
-rw-r--r--gdb-native.go164
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
+}