INSERT INTO sites(host) VALUES('markshroyer.com') 1045: Access denied for user 'www-data'@'localhost' (using password: NO) markshroyer.com Estimated Worth $394,495 - MYIP.NET Website Information
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Registrant Organization: Shroyer, Mark

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Debugging the OpenBSD kernel via QEMU
January 4, 2013 ndash; 12:03 am
Recently I had to track down a minor bug in the OpenBSD kernel. I tapped QEMU and GDB as debugging tools for the task, running on Ubuntu 12.04 as the host OS. This combination worked extremely well, so for the record here #8217;s how I set it all up.
OpenBSD comes equipped with two kernel debugging mechanisms: ddb and kgdb. ddb(4) is an in-kernel debugger, enabled by default in the GENERIC kernel, and can be invoked either explicitly from the console or automatically in the event of a panic. It is analogous to the Linux debugger kdb in that it can be used to set breakpoints and examine the stack or register state, but (like kdb) it is not a source-level debugger.
For source debugging there is kgdb(7), which offers the ability to remotely debug the kernel by way of a GDB stub running over a serial port; this is similar to the Linux debugger kgdboc. However, kgdb it is not available in the GENERIC kernel, and it imposes an additional set of configurations and debugger latencies on the user. If your debugging task is amenable to running OpenBSD within a virtual machine, as mine was, then there is an easier and better way #8230;
Continue reading rarr;
Posted in Computers, Unix | 5 replies
Keyboard navigation in Emacs GDB mode
November 24, 2012 ndash; 5:12 pm
I love Emacs GDB mode, but I always found it annoying that there is no given key binding (or function which could be directly mapped into a key binding) for switching between the different views given by gdb-many-windows. The usual window and buffer switching functions are insufficient because the GDB windows are flagged as dedicated (so switch-buffer refuses to swap them in place), and in the case of the Locals/Registers and Breakpoints/Threads windows, the buffer you want to visit doesn #8217;t necessarily even exist until you click that button.
This went from mildly annoying to a major headache when I needed to run the debugger in a remote Emacs session, over SSH from Mac OS X #8217;s Terminal.app which does not support xterm mouse emulation. So I wrote this gdb-select-window function and corresponding key bindings to finally get the desired behavior #8230;
code class="language-emacs lisp emacs lisp";; For the consistency of gdb-select-window's calling convention...
(defun gdb-comint-buffer-name ()
(buffer-name gud-comint-buffer))
(defun gdb-source-buffer-name ()
(buffer-name (window-buffer gdb-source-window)))
(defun gdb-select-window (header)
quot;Switch directly to the specified GDB window.
Moves the cursor to the requested window, switching between
`gdb-many-windows' \ quot;tabs\ quot; if necessary in order to get there.
Recognized window header names are: 'comint, 'locals, 'registers,
'stack, 'breakpoints, 'threads, and 'source. quot;
(interactive quot;Sheader: quot;)
(let* ((header-alternate (case header
('locals 'registers)
('registers 'locals)
('breakpoints 'threads)
('threads 'breakpoints)))
(buffer (intern (concat quot;gdb- quot; (symbol-name header) quot;-buffer quot;)))
(buffer-names (mapcar (lambda (header)
(funcall (intern (concat quot;gdb- quot;
(symbol-name header)
quot;-buffer-name quot;))))
(if (null header-alternate)
(list header)
(list header header-alternate))))
(window (if (eql header 'source)
gdb-source-window
(or (get-buffer-window (car buffer-names))
(when (not (null (cadr buffer-names)))
(get-buffer-window (cadr buffer-names)))))))
(when (not (null window))
(let ((was-dedicated (window-dedicated-p window)))
(select-window window)
(set-window-dedicated-p window nil)
(when (member header '(locals registers breakpoints threads))
(switch-to-buffer (gdb-get-buffer-create buffer))
(setq header-line-format (gdb-set-header buffer)))
(set-window-dedicated-p window was-dedicated))
t)))
;; Use global keybindings for the window selection functions so that they
;; work from the source window too...
(mapcar (lambda (setting)
(lexical-let ((key (car setting))
(header (cdr setting)))
(global-set-key (concat quot;\C-c\C-g quot; key) #'(lambda ()
(interactive)
(gdb-select-window header)))))
'(( quot;c quot; . comint)
( quot;l quot; . locals)
( quot;r quot; . registers)
( quot;u quot; . source)
( quot;s quot; . stack)
( quot;b quot; . breakpoints)
( quot;t quot; . threads)))
code
Put this in your ~/.emacs.el or init.el and fire up gdb-many-windows, and then you #8217;ll be able to quickly switch between the GDB windows with the following keyboard shortcuts:
C-c C-g c #8212; comint (GDB command) buffer
C-c C-g l #8212; locals buffer
C-c C-g r #8212; registers buffer
C-c C-g u #8212; source window
C-c C-g s #8212; stack buffer
C-c C-g b #8212; breakpoints buffer
C-c C-g t #8212; threads buffer
Posted in Code, Linux | 1 reply
Both true and false: a Zen moment with C
June 27, 2012 ndash; 7:15 am
Update: Discussion on Hacker News
I ran into a really fun bug at work yesterday, where I discovered that my C program was branching down logically inconsistent code paths. After drinking another cup of coffee and firing up GDB I realized that somehow, a boolean variable in my code was simultaneously testing as both true and not true.
While I cannot reproduce the actual source code here, the effect was that code like
bool p;
/* ... */
if ( p )
puts( quot;p is true quot;);
if ( ! p )
puts( quot;p is false quot;);
would produce the output:
p is true
p is false
So what #8217;s going on here?
Continue reading rarr;
Posted in Code | 63 replies
Pointfree style in Python
November 14, 2011 ndash; 6:12 am
I #8217;ve been getting back into Python lately #8230; I just wrote a small module that provides support for pointfree style programming with a combination of automatic partial function/method application and operator overloading for function composition:
from pointfree import *
from operator import add
fn = pfmap(len) \
gt; gt; pfmap(lambda n: n**2) \
gt; gt; pfreduce(add, initial=0)
fn([ quot;foo quot;, quot;barr quot;, quot;bazzz quot;]) # == 50
See the overview for a lengthier introduction. You can install the pointfree module from the Python Package Index:
$ pip install pointfree
Links:
Module documentation
Github project page
Python Package Index page
Posted in Code | Leave a reply
Martin Kleppmann: Accounting for Computer Scientists
March 7, 2011 ndash; 10:43 pm
I just found a great blog post by Martin Kleppmann titled Accounting for Computer Scientists, a succinct introduction to double-entry accounting (although he doesn #8217;t refer to it as such) in terms of basic graph theory:
Eventually I figured it out: basic accounting is just graph theory. The traditional ways of representing financial information hide that structure astonishingly well, but once I had figured out that it was just a graph, it suddenly all made sense.
He goes on to illustrate how a profit-and-loss statement and a balance sheet can be visualized on a simple DAG. 聽Good stuff #8230;
Posted in Uncategorized | 1 reply
OpenBSD Router Guide
February 7, 2011 ndash; 12:22 am
I #8217;ve been using OpenBSD as a NAT router for a few years now. Here #8217;s a guide showing how I got it up and running, in case anyone is interested in doing the same.
Posted in Computers, Unix | 2 replies
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Debugging the OpenBSD kernel via QEMU
Keyboard navigation in Emacs GDB mode
Both true and false: a Zen moment with C
Pointfree style in Python
Martin Kleppmann: Accounting for Computer Scientists
OpenBSD Router Guide
Updating your music collection with PowerShell
PXE booting OpenBSD on an ALIX via Ubuntu Live CD
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