package proc import ( "fmt" sys "golang.org/x/sys/unix" ) type WaitStatus sys.WaitStatus // OSSpecificDetails hold Linux specific // process details. type OSSpecificDetails struct { registers sys.PtraceRegs } func (t *Thread) halt() (err error) { err = sys.Tgkill(t.dbp.pid, t.ID, sys.SIGSTOP) if err != nil { err = fmt.Errorf("halt err %s on thread %d", err, t.ID) return } _, _, err = t.dbp.wait(t.ID, 0) if err != nil { err = fmt.Errorf("wait err %s on thread %d", err, t.ID) return } return } func (t *Thread) stopped() bool { state := status(t.ID, t.dbp.os.comm) return state == StatusTraceStop || state == StatusTraceStopT } func (t *Thread) resume() error { return t.resumeWithSig(0) } func (t *Thread) resumeWithSig(sig int) (err error) { t.running = true t.dbp.execPtraceFunc(func() { err = PtraceCont(t.ID, sig) }) return } func (t *Thread) singleStep() (err error) { for { t.dbp.execPtraceFunc(func() { err = sys.PtraceSingleStep(t.ID) }) if err != nil { return err } wpid, status, err := t.dbp.waitFast(t.ID) if err != nil { return err } if (status == nil || status.Exited()) && wpid == t.dbp.pid { t.dbp.postExit() rs := 0 if status != nil { rs = status.ExitStatus() } return ProcessExitedError{Pid: t.dbp.pid, Status: rs} } if wpid == t.ID && status.StopSignal() == sys.SIGTRAP { return nil } } } func (t *Thread) blocked() bool { pc, _ := t.PC() fn := t.dbp.goSymTable.PCToFunc(pc) if fn != nil && ((fn.Name == "runtime.futex") || (fn.Name == "runtime.usleep") || (fn.Name == "runtime.clone")) { return true } return false } func (t *Thread) saveRegisters() (Registers, error) { var err error t.dbp.execPtraceFunc(func() { err = sys.PtraceGetRegs(t.ID, &t.os.registers) }) if err != nil { return nil, fmt.Errorf("could not save register contents") } return &Regs{&t.os.registers, nil}, nil } func (t *Thread) restoreRegisters() (err error) { t.dbp.execPtraceFunc(func() { err = sys.PtraceSetRegs(t.ID, &t.os.registers) }) return } func (t *Thread) writeMemory(addr uintptr, data []byte) (written int, err error) { if len(data) == 0 { return } t.dbp.execPtraceFunc(func() { written, err = sys.PtracePokeData(t.ID, addr, data) }) return } func (t *Thread) readMemory(addr uintptr, size int) (data []byte, err error) { if size == 0 { return } data = make([]byte, size) t.dbp.execPtraceFunc(func() { _, err = sys.PtracePeekData(t.ID, addr, data) }) return }