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Example: sig-handler funcs for C and C++ (throw-catch) PART 2

Posted 05-13-2012 at 11:37 PM by rainbowsally
Updated 05-14-2012 at 07:39 AM by rainbowsally (possible cpu hang if -O2 switch is used)

Tags compiling, computer mad science, signal handlers, throw-catch in c, throw-catch segfaults

UPDATE:
Note: The signal-handler files can't be compiled with the -O2 switch and it's probably best if you only trap the signals you really intend to redirect, such as SIGSEGV (11). If you compile what we have here with the -O2 switch your cpu may hang if you try to exit using Ctrl-C for example. See implementation notes added to signal-handler.c below.

See part 1 for main functions to test this in C and C++.

To throw and catch stuff like segfaults in C++ it's...

rainbowsally

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Example: sig-handler funcs for C and C++ (throw-catch) PART 1

Posted 05-13-2012 at 11:22 PM by rainbowsally

Tags compiling, computer mad science, signal handlers, throw-catch in c, throw-catch segfaults

Today's Features

THROW-CATCH in C
Translating signals to C++ throw-catch parameters.

To compile the C++ example these vars are set in mc2.def and should be similar for other methods of building it.

Code:

COMPILE = g++ -m32 -c -o # COMPILE <output_file> ...
CFLAGS = -Wall -g3 --save-temps
# or CFLAGS = -Wall -O2 # optimized
INCLUDE = -I $(SRCDIR) -I$(PREFIX)/include 

LINK = g++ -m32 -o # LINK <output_file> ...
LDFLAGS = #

...

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Handle segmentation faults in try-catch block

Posted 05-06-2012 at 12:52 AM by rainbowsally
Updated 05-06-2012 at 05:19 AM by rainbowsally (updated code for 32 and also 64 bit arch)

Tags catching sigsegv, compiling, computer mad science, try-catch seg violations

[CHANGELOG:
May 6, 2012 (second edit)
Latest:
Tested 64 bit code (and also 32), corrected close brace in function that got lost in the #if-#else-#endif mixup (with extern "C" close brace)... nevermind. It works now.

Features:

catch segmentation faults and continue normally

Don't underestimate this concept. We'll be using it in the GUI-Interactive interpreter.

This is a highly simplified version of the SEH for linux experiment posted...

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GUI-Interactive: Display a list of QT4 classes

Posted 05-05-2012 at 04:51 AM by rainbowsally
Updated 05-05-2012 at 05:00 AM by rainbowsally

Tags compiling, computer mad science

Today's features:

A stand alone executable to list all of QT4's classes.
A first function for an interactive interpreter for QT funcs and classes
Another simple but interesting parse job.

Requres:

the libLQ download (or your own work-alike hack)

http://www.linuxquestions.org/questi...eration-34648/

We are delving into QT's system for reasons explained in earlier blog entries. When I tried early...

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QT4 Event preemption: mouse click to get object name

Posted 05-03-2012 at 11:30 AM by rainbowsally
Updated 08-06-2014 at 10:15 AM by rainbowsally

Tags compiling, computer mad science

See also the experiment to dump properties.
http://www.linuxquestions.org/questi...nal-app-34716/

Now that we have event preemption ability, let's get simple again and create ui application that can tell the name of a widget by clicking on it.

[It's simpler than you think but I have uploaded the sources and makefile in case my description of this process is too complicated or confusing.]
...

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