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Starting With Stat (dyn linked shell routines)

Posted 02-19-2012 at 08:51 PM by rainbowsally

Features:
  • dynamic linkage of shell subroutines
  • automatically loading shell dependencies
In order to dynamically link subroutine files we need a method of blocking multiple loads of any file.

For this, we load a set of base definitions in a file named sub.sub. The sub.sub file includes some simple functions for listing functions and the main function that blocks multiple-loading as well as a 'sub.unload <filename> function so we can unload and reload subroutines while editing...
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Old

Create a self-extracting archive

Posted 02-16-2012 at 05:45 AM by rainbowsally
Updated 02-23-2012 at 07:50 AM by rainbowsally

CHANGELOG Feb 22, 2012
Changed the temp dir from /tmp to $HOME/tmp so everyone has write and execute perms in it. Added more cleanups including removal of the temp dir unless the user already had it and was using it.


Features:
  • Embedding binary data in a shell script.
  • Writing a program with a program.
  • Various useful snippets even if the app doesn't turn you on.

Requires:
  • base64 (encoder in core utils)
  • tar (core utils)
  • xz (lzma stuff, real old linux
...
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Old

Simple C: some ideas on how to find headers, names, and a name demangler tool

Posted 02-08-2012 at 03:23 AM by rainbowsally
Updated 09-04-2013 at 10:20 PM by rainbowsally

The simplest yet, I think.. at least the C program is.

Features:
  • tips on how to find C/C++ header paths and declarations
  • tips on how to find libs containing references and definitions
  • a super-simple program to demangle C++ names
----------------
Note: With even a simple automatic makefile generator such as the one built from sources in this blog (
http://www.linuxquestions.org/questi...-part-2-34421/),
...
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Old

ASM: mixing assembler and C++

Posted 02-05-2012 at 12:05 PM by rainbowsally
Updated 09-04-2013 at 10:19 PM by rainbowsally

This is for intel 32 bit assembler. For 64-bits the calling convention is a bit different. See previous entries (specifically asm 64 bits) if you need a leg-up to break the 64 bit barrier.

Features:
  • Asm functions that can call class functions (using an object pointer) through jump vectors written in C.
  • Usage of extern "C" declarations to un-mangle names we need to keep simple for asm coding.

[If you really want to get down, you can use the mangled names as...
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Old

ASM: Intercepting (and using) Errors (like segfaults) in asm (aka SEH)

Posted 02-03-2012 at 04:10 PM by rainbowsally

This is for i86 and x86_64 types but with a bit of poking around you can probably find a similar way to do this with other CPUs.

Note: This asm requires 'sigaction'. (See the test code. And bear in mind that this is not an attempt to create a full-blown system of signal handlers. Check the libc docs for 'sigaction' for ideas on how you can use something like this for a seed for a more extensive application.)

There used to be a lot of cool little programs for the...
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