Wednesday, July 28, 2010

Update 28 Jul

Again failing to post topics and my assignments I said previously to post.
These days I am particularly busy with an assignment to implement a small dbms. Though a big task doing it as a part by part assignment. Hoping to post all my previous assignments, but main problem i am facing is where to upload the programs. I used ensips for my previous uploads but esnips is not working here at my univ as flash is blocked.
Any way that's for today.

Wednesday, July 21, 2010

GDB guide

Today I found a good short and quick introduction to gdb here.

This is a short preview of it -

Help Commands
help commandGet help on a certain command
apropos keywordSearch help for a particular keyword
Starting and Quitting
gdb [-tui] [-c core] [exename](Unix Command) Start gdb on an executable or standalone; specify "-tui" to start the TUI GUI; specify "-c" with a corefile name to see where a crash occurred
run [arg1] [arg2] [...]Run the currently loaded program with the given command line arguments
quitExit the debugger
file exenameLoad an executable file by name
Breakpoints and Watchpoints
break locationSet a breakpoint at a location, line number, or file (e.g. "main", "5", or "hello.c:23")
watch expressionBreak when a variable is written to
rwatch expressionBreak when a variable is read from
awatch expressionBreak when a variable is written to or read from
info breakDisplay breakpoint and watchpoint information and numbers
info watchSame as info break
clear locationClear a breakpoint from a location
delete numDelete a breakpoint or watchpoint by number
Stepping and Running
nextRun to the next line of this function
stepStep into the function on this line, if possible
stepiStep a single assembly instruction
continueKeep running from here
CTRL-CStop running, wherever you are
finishRun until the end of the current function
advance locationAdvance to a location, line number, or file (e.g. "somefunction", "5", or "hello.c:23")
jump locationJust like continue, except jump to a particular location first.
Examining and Modifying Variables
display expressionDisplay the value of a variable or expression every step of the program—the expression must make sense in the current scope
info displayShow a list of expressions currently being displayed and their numbers
undisplay numStop showing an expression identified by its number (see info display)
print expressionPrint the value of a variable or expression
printf formatstr expressionlistDo some formatted output with printf() e.g. printf "i = %d, p = %s\n", i, p
set variable expressionSet a variable to value, e.g. set variable x=20
set (expression)Works like set variable
Window Commands
info winShows current window info
focus winnameSet focus to a particular window bby name ("SRC", "CMD", "ASM", or "REG") or by position ("next" or "prev")
fsAlias for focus
layout typeSet the window layout ("src", "asm", "split", or "reg")
tui reg typeSet the register window layout ("general", "float", "system", or "next")
winheight valSet the window height (either an absolute value, or a relative value prefaced with "+" or "-")
whAlias for winheight
set disassembly-flavor flavorSet the look-and-feel of the disassembly. On Intel machines, valid flavors are intel and att
Misc Commands
RETURNHit RETURN to repeat the last command
backtraceShow the current stack
btAlias for backtrace
attach pidAttach to an already-running process by its PID
info registersDump integer registers to screen
info all-registersDump all registers to screen

Monday, July 19, 2010

After One Year...

Almost one year have passed since my college ended and I came to this new University.I don't know what have I really done during this time.Sometimes I feel I may have changed during this time.But things have not changed much though.

I said earlier that I would post here more frequently than ever, but something never change so easily.

By the way, I have only posted my programs from my first term. Posting programs from 4 terms is pending hoping to post that soon.

I know nobody reads this blog, but I am thinking to post things here just to practice writing.

Oh well. Thats for now...