#### gdb shit

http://yusufonlinux.blogspot.com/2010/11/debugging-core-using-gdb.html
https://en.wikibooks.org/wiki/Linux_Applications_Debugging_Techniques/Core_files

* compile with -g for c++ applications

* start-up

gdb program = run program in gdb to get more output if immediate crash
gdb program core = start gdb with program and its core (more information)
check threads for possible match with core.pid/lwp

* running gdb

## basic information gathering
bt (full) = print stack (optional full info)
frame n = select n frame in stack
where full = get more information on frame; use with thread apply all
info frame = get register, args, local info from frame
info variables = get all variables and memory locations from core
info locals = get all local variables
info functions func? = get all functions and memory locations from core
info symbol MEM = get more information from calling SO?
info shared = get list of shared objects in core
info proc = get process information (if using core, will give pid)
info scope (funcname,source line,*address) = prints all variables local to scope defined
info registers = get all registers
info threads = less verbose thread details
whatis = get type
disassemble = get all assembly instructions

## break/check points

b function_name, line_number = run program and stop at break
c = continue execution from breakpoint
c n = countinue n times
d/delete b n|c n = delete breakpoint/checkpoint number
clear ln|function_name = delete breakpoint set on specific line numer or function_name
disable/enable = disable/enable breakpoints instead of delete
info = get break/check point information
step = execute next line
run = execute program w/ optional args

## printing
print can be used for displaying pointer information - print *dump_ptr->blah
print /format (x (int), d(decimal), u(unsigned decimal), o(octal), t(binary int), a(address), c(char), f(float))

## setting 
set var/variable v=n  = set a variable v's value to n


## examining threads
thread n = select thread number n (normal commands work here)
thread apply all cmd = run cmd on all threads (use with bt)

## lock stuff
print mutex
print locks_mutex
print locks

## viewing source code
list + = gets source code from selected frame; useful to get variables for printing


### using x/ (examine memory)
format = s(null string), i (machine instruction), x (hex) = x/3sh (examine 3 half words of null string memory)
x/ MEM = get information from memory location
x/nfu MEM = get more inforamtion concerning stack (ASCII) n = number, f = format, u = unit (requires bytes, halfwords(2 bytes), words(4 bytes), giantwords(8 bytes))
x/16i $pc = get all instructions












#### organize 

* printing vectors
print vector = print entire vector
print vector.size() = get list of elements in vector
print *(vector._M_impl._M_start|finish) = print first|last element
print *(vector._M_impl._M_start)@N = print N elements from start