Debugging A Project with qtcreator

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QT

Backgroud:
System:CentOS
tools: QTCreator2.0.1
lib: qt/ace

Question
The first question:
there was a warning about this.

&warning: GDB: Failed to set controlling terminal:\346\227\240\346\225\210\347\232\204\345\217\202\346\225\260\n"

The tools->Options->Debugger->Gdb has already chained. /usr/bin/gdb

The second question :
I used the ace libary, used ACE_Dev_Poll_Reactor, it had worked.But When i debuged this,
The QtCreator had outputed "1094719808:work_pending_i:Interrupted system call."
I track ACE code.

int
ACE_Dev_Poll_Reactor::handle_events_i
{
.......
    do{
      result = this->work_pending_i (max_wait_time);
      if (result == -1 && (this->restart_ == 0 || errno != EINTR))
        ACE_ERROR ((LM_ERROR, ACE_TEXT("%t: %p\n"), ACE_TEXT("work_pending_i")));
    }
  while (result == -1 && this->restart_ != 0 && errno == EINTR);
............
}

The message maybe print from here.I am not sure.




[orig. title]
There was a warning "warning :gdb failed to set .." when i had debuged a project with qtcreator.