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Top Forums Programming *** glibc detected *** double free or corruption: 0x40236ff4 *** Post 302074124 by Corona688 on Saturday 20th of May 2006 01:47:50 AM
Old 05-20-2006
I dunno. If you can't track down exactly where the crash is happening, it'll be very hard to tell anything... can you compile it with the '-ggdb' flag, then run it like this:
Code:
gdb ./program
gdb prompt> run
crash error message
gdb prompt> bt f
full backtrace printout
gdb prompt> quit

I also notice that, since you're using cout, your messages aren't necessarily getting printed when you think they are -- it buffers. If it crashes before the buffer is flushed, it won't get printed, even if the cout call happened first. Even explicit flushing doesn't seem to help that on some systems. Try fprintf instead:
Code:
#include <stdio.h>

...

fprintf(stderr,"printf example:  c-str %s, int %i, ptr %p, float %f char %c\n",
    "c-string", 42, (void *)(0xdeadbeef), 3.14159, 'q');

stderr never buffers.

It also helps in debugging that fprintf is one single function call, while cout is as many function calls as there are << paramaters...

Last edited by Corona688; 05-20-2006 at 02:56 AM..
 

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DL(3)							     Library Functions Manual							     DL(3)

NAME
DL - generate logging messages in C and C++ using a debugger SYNOPSIS
#include <DL.h> DL(format,...) DLG(guard,format,...) DLH(handler,format,...) DLP(param,format,...) DLGH(guard,handler,format,...) DLHP(handler,param,format,...) DLGHP(guard,handler,param,format,...) DESCRIPTION
The DL macro is used to print logging or debugging messages using a debugger. The nana(1) command generates a set of debugger commands which are then sourced into gdb(1) to implement the logging. If you don't run the executable under gdb(1) then no tracing will occur. The arguments are: format,... - a printf(3) style argument list containing the message guard - print only if the guard is true. handler - the code that does the printing. Default: fprintf param - a parameter to be passed off to the handler. Default: stdout See nana.info for details on configuring the behaviour. SEE ALSO
nana-clg(1), nana(1), nana(3), I(3), DI(3), L(3), DL(3), Q(3) and nana.info. The nana.info file is the primary documentation for this library. AUTHOR
Phil Maker <pjm@gnu.org> DL(3)
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