Hello Greg, Thanks for the input. It still does not work ( I rewrote my terminal code to look similar to lldb's PseudoTerminal, and it is still not working)
To simplify things, I tried some basic things with the *command line* tool 'lldb': I created a file ~/.lldbinit with the following content: eran@eran-linux: ~/llvm/build/bin $ cat ~/.lldbinit settings set target.output-path /tmp/dbg.out eran@eran-linux: ~/llvm/build/bin $ I then ran lldb while having tail -f /tmp/dbg.out& in another terminal to see if the stdout is being redirected Now, this is the interesting part: In the first run when the file /tmp/dbg.out was empty - the redirection worked (tail showed the debuggee stdout) In the second run (and later) - nothing was written to the file However, if I truncate the file using the below command: $ > /tmp/dbg.out and run lldb again - I see the stdout again - but same as before only for the first time (i.e. as long as the file is empty the stdout was redirected) The next thing I tried was to use a terminal name for redirection: - Open a new terminal and type `tty` (in my case it gave /dev/pts/19 ) - Edit the ~/.lldbinit: settings set target.output-path /dev/pts/19 - Start lldb and verify that the setting is set properly by running: settings show target.output-path - Run the program under lldb - the output is not redirected (i.e. it is show in the same console where I ran lldb) Any ideas? P.S. Sorry if this looks like a voodoo, but this is what I am getting here... ;) Eran On Mon, Mar 24, 2014 at 6:46 PM, Greg Clayton <[email protected]> wrote: > Check out the PseudoTerminal class in > trunk/source/Utility/PseudoTerminal.cpp. > > See the function named PseudoTerminal::OpenFirstAvailableMaster(...). You > must call posix_openpt, grantpt, and unlockpt. I am guessing that because > you aren't calling grantpt and granting access to the slave you are failing > to be able to use the slave in your child process. > > Greg Clayton > > On Mar 23, 2014, at 11:32 AM, Eran Ifrah <[email protected]> wrote: > > > Sure, thanks for the help so far > > Eran > > > > > > On Sun, Mar 23, 2014 at 8:31 PM, Piotr Rak <[email protected]> wrote: > > I am sorry, but nothing obvious comes to me right now, probably you'll > need to wait for Monday, when people more familiar with lldb will be able > to help you debug this problem. > > > > > > 2014-03-23 16:07 GMT+01:00 Eran Ifrah <[email protected]>: > > > > > > > > > > On Sun, Mar 23, 2014 at 4:29 PM, Piotr Rak <[email protected]> wrote: > > Sorry I misinformed you about posix_spawn - it is not true for Linux and > FreeBSD at least, it will use ordinary fork. > > > > > > 2014-03-23 15:23 GMT+01:00 Piotr Rak <[email protected]>: > > > > > > Hi, > > > > 2014-03-23 14:04 GMT+01:00 Eran Ifrah <[email protected]>: > > > > Thanks for your pointer Piotr. Here is the code I am using to open a > pseudo-terminal (there is the UI part, which I left out): > > > > char __name[128]; > > memset(__name, 0, sizeof(__name)); > > > > int master(-1); > > m_slave = -1; > > if(openpty(&master, &m_slave, __name, NULL, NULL) != 0) > > return wxT(""); > > > > // disable ECHO > > struct termios termio; > > tcgetattr(master, &termio); > > termio.c_lflag = ICANON; > > termio.c_oflag = ONOCR | ONLRET; > > tcsetattr(master, TCSANOW, &termio); > > > > m_tty = wxString(__name, wxConvUTF8); > > > > At the end, m_tty contains a string name (e.g. /dev/pts/19 ). > > Note that the above code works flawlessly when using it with gdb (i.e. > if I pass this "/dev/pts/19" to gdb's switch -tty=/dev/pts/19 I will get > all the inferior output/err/input to my internal terminal) > > > > However, doing the same with LLDB (using C++ API not the command line , > i.e. passing "/dev/pts/19" as an argument to SBTarget::Launch(...)) I get > nothing as output... > > > > Looks sane to me. > > > > Also, I am not sure I am following the idea behind replacing the > "Launch" function with my own fork(), looking at the code of Launch() > suggests that it does more than a simple fork... > > > > > > That was my idea to debug issue if nothing else helps. > > Or rather bisect on which side it really is, sorry if I did not make it > clear... > > So I was trying suggest replacing SBTarget::Launch with fork, write to > child stdout/err, and see if that works alone.... > > > > SBTarget::Launch is usually actually posix_spawn right now, it uses > posix_spawnattr_addopen to open descriptors for your specified paths, and > should open it 3 times - given current implementation - even it is just one > file. > > > > Have you inspected SBProcess and SBError returned by SBTarget::Launch? > > > > I checked IsValid() on both and its OK for both. I can actually run > "next" Continue etc and seems to be working. Its just that I can't seem to > redirect the stdout/err to my own console. > > > > > > Do you see your inferior process is indeed launching, just not > displaying anything? > > Yes, ps -ef shows the debugee > > > > Do you have an option to check if those terminals are actually being > opened (like examining /proc/<pid>/fd for linux)? > > The terminal is opened. Like I mentioned in my previous email, using the > _same_ code with gdb works > > I also have a standalone terminal application which I wrote which is > also using the same set of classes all of the are working for couple of > years now without any problems > > > > I also tried this: > > I typed in my konsole 'tty' and used that as the input for Launch - it > also seems to have no effect > > > > > > > > Good luck, > > /Piotr > > > > Any more hints? > > Eran > > > > > > > > On Sat, Mar 22, 2014 at 9:36 PM, Piotr Rak <[email protected]> wrote: > > Hi, > > > > It should. > > Have you opened master pseudoterminal like?: > > > > int fd = posix_openpt(flags); // open("/dev/ptmx") might work here too > but less portable; > > grantpt(fd); > > unlockpt(fd); > > > > Depending on target you might need some bizarre ioctls here, but > assuming you are using Linux/FreeBSD/MacOSX > > you should be fine. > > > > If you had already master pseudo-terminal file descriptor you can skip > steps above. > > > > You can use ptsname for master file descriptor it will return you name > of slave pseudo-terminal for your master. > > Later you can pass name returned by ptsname(fd) as Launch arguments. > > > > If above won't work you can try replacing Launch() call with ordinary > fork, and in child process: > > > > slavefd = open(slavename, O_RDWR); > > > > dup2(0, slavefd); > > dup2(1, slavefd); > > dup2(2, slavefd); > > > > And see if that works alone for you... > > > > Good luck, > > /Piotr > > > > > > 2014-03-22 19:29 GMT+01:00 Eran Ifrah <[email protected]>: > > Hello, > > > > I am trying to use the C++ API with good success so far. > > I am now at a point where I want to redirect stdin/out/err of the > inferior to my application (my application creates a separate pseudo > terminal window) > > > > Looking at the SBTarget::Launch, I thought that simply passing > "/dev/pts/<some-number>" as the 3rd, 4th and 5th argument will do the trick > .. well, it did not. > > I am missing something basic here, can anyone shed some light please? or > give an example (better) of how to achieve this? > > > > Thanks! > > > > -- > > Eran Ifrah > > Author of codelite, a cross platform open source C/C++ IDE: > http://www.codelite.org > > wxCrafter, a wxWidgets RAD: http://wxcrafter.codelite.org > > > > _______________________________________________ > > lldb-dev mailing list > > [email protected] > > http://lists.cs.uiuc.edu/mailman/listinfo/lldb-dev > > > > > > > > > > > > -- > > Eran Ifrah > > Author of codelite, a cross platform open source C/C++ IDE: > http://www.codelite.org > > wxCrafter, a wxWidgets RAD: http://wxcrafter.codelite.org > > > > > > > > > > > > -- > > Eran Ifrah > > Author of codelite, a cross platform open source C/C++ IDE: > http://www.codelite.org > > wxCrafter, a wxWidgets RAD: http://wxcrafter.codelite.org > > > > > > > > > > -- > > Eran Ifrah > > Author of codelite, a cross platform open source C/C++ IDE: > http://www.codelite.org > > wxCrafter, a wxWidgets RAD: http://wxcrafter.codelite.org > > _______________________________________________ > > lldb-dev mailing list > > [email protected] > > http://lists.cs.uiuc.edu/mailman/listinfo/lldb-dev > > -- Eran Ifrah Author of codelite, a cross platform open source C/C++ IDE: http://www.codelite.org wxCrafter, a wxWidgets RAD: http://wxcrafter.codelite.org
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