Re: gui/pager problem on MacOSX

[Ben Abbott]

On Oct 27, 2013, at 7:49 PM, John W. Eaton wrote:

> On 10/24/2013 08:56 AM, Ben Abbott wrote:
>> On Oct 24, 2013, at 7:58 AM, Ben Abbott wrote:
>> 
>>> On 10/11/2013 12:51 PM, John W. Eaton wrote:
>>> 
>>> I think we can get away with doing an exec to start the GUI program
>>> after the fork, even if we have already called some GUI functions in
>>> the main program.
>>> 
>>> So instead of forking without exec, I propose that we create a small
>>> driver program that will
>>> 
>>> 1. Check to see whether there is a graphical display available.  If
>>>    not, start the command-line version of the program.
>>> 
>>> 2. Check the command line arguments for --no-gui.  If it is present,
>>>    start the command-line version of the program.
>>> 
>>> 3. Fork.  In the parent, set up signal handling to pass any signals
>>>    to the child process and wait for the child.  In the child, exec
>>>    the GUI version of the program.
>>> 
>>> A simple prototype of this idea is attached.
>>> 
>>> Ben, can you try this and see whether it works?  You'll need to edit
>>> the file to define OCTAVE_INSTALL_DIR to point to the location where
>>> you have a copy of Octave with the GUI installed.  You'll also need to
>>> link with the Carbon libraries.
>>> 
>>> If this approach works on OS X, then I can work on integrating it with
>>> the Octave sources.  It will still need a more work to also avoid
>>> starting the GUI if a filename has been provided on the command line,
>>> either with a command like "octave foo.m" or "octave<  foo.m".  That
>>> logic is already in octave.cc, so it should not be too hard to make
>>> this work.  But it will take some time to get it fully working and
>>> merged with the Octave build system.
>> 
>> Carlo, I had a few minutes to try out the driver.  I built it using a script 
>> containing ...
>> 
>> #! /bin/sh -e
>> CC=/opt/local/bin/gcc-mp-4.7
>> CFLAGS="-pipe -O2 -m64 -D_THREAD_SAFE -pthread"
>> CARBON_LIBS="-Wl,-framework -Wl,Carbon"
>> $CC driver.c -o driver $CFLAGS $CARBON_LIBS
>> 
>> jwe, Using your driver, the pager works for me.  Thanks!
> 
> OK, I checked in a changeset with a more complete program based on
> this idea.


The pager now works for me.

Ben