[lldb-dev] -o "process launch" and stdio forwarding

Pavel Labath labath at google.com
Tue Mar 10 03:42:03 PDT 2015

Thanks for the replies.

On Linux, I was testing this with lldb-server. But actually, this does not
work on Mac either. That is why I was unsure and wanted to double check the
expected behavior. You can reproduce it like this:

labath-macbookair ~/ll/lldb/DerivedData $ cat a.cc

#include <iostream>

int main() {

std::string s;

std::cin >> s;

std::cout << "Read: " << s << std::endl;


labath-macbookair ~/ll/lldb/DerivedData $ clang++ a.cc

labath-macbookair ~/ll/lldb/DerivedData $ ./a.out


Read: asdf

labath-macbookair ~/ll/lldb/DerivedData $ lldb/Build/Products/Debug/lldb
./a.out -o "process launch"

(lldb) target create "./a.out"

Current executable set to './a.out' (x86_64).

(lldb) process launch



^CProcess 22694 stopped

* thread #1: tid = 0x434ef4, 0x00007fff8df928ea
libsystem_kernel.dylib`__read_nocancel + 10, queue =
'com.apple.main-thread', stop reason = signal SIGSTOP

Since we seem to agree that this is a bug, I will try to find a solution to
fix it.



On 9 March 2015 at 20:18, Greg Clayton <gclayton at apple.com> wrote:

> This is a bug. It works on MacOSX, so this will be something we need to
> fix for Linux. The question is: is this with lldb-server or with the
> ProcessLinux?
> Greg
> > On Mar 9, 2015, at 6:03 AM, Pavel Labath <labath at google.com> wrote:
> >
> > Hi all,
> >
> > I have noticed that after starting a debug session with -o "process
> launch", the standard input does not get forwarded to the debugged process.
> Is this the indented behavior (not forwarding stdio when debugging with a
> script), or a bug? I would consider it a bug, because it means I can't just
> start the debug session from the command line and wait for the bug to occur
> if I need to give input to the application for the bug to manifest.
> >
> > cheers,
> > pavel
> > _______________________________________________
> > lldb-dev mailing list
> > lldb-dev at cs.uiuc.edu
> > http://lists.cs.uiuc.edu/mailman/listinfo/lldb-dev
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