LinuxQuestions.org - Blog Entries

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...

rainbowsally

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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

Tags computer mad science, utilities

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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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 02-08-2012 at 03:29 AM by rainbowsally

Tags compiling, computer mad science, demangle, simple c, utilities

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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ASM: mixing assembler and C++

Posted 02-05-2012 at 12:05 PM by rainbowsally

Tags asm, assembler, computer mad science

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

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

Tags asm, assembler, computer mad science, error handling, exceptions

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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