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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
}
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