02-20-2010
Quote:
Sure -- but that's not the problem (and it won't be the problem).
Of all the faith-based initiatives Bush funded, faith-based software maintenance has to be the worst.
Bottom line is, you don't know why it crashed, don't know why it stopped crashing, and don't know if the problem is truly solved yet or not. All we know is that something trashed some memory somewhere somehow. Time for a memory debugger.
All this odd stack rearranging makes me more and more suspicious of memory trashing, not less! When it works perfectly it works perfectly, but one mistake and you're mangling your own stack frame. It could also be a disguised array-bounds problem, these macros are using hidden stack variables and writing beyond them could smash your stack too.
Last edited by Corona688; 02-20-2010 at 05:22 PM..
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LEARN ABOUT NETBSD
alloca
ALLOCA(3) BSD Library Functions Manual ALLOCA(3)
NAME
alloca -- memory allocator
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <stdlib.h>
void *
alloca(size_t size);
DESCRIPTION
The alloca() function allocates size bytes of space in the stack frame of the caller. This temporary space is automatically freed on return.
RETURN VALUES
The alloca() function returns a pointer to the beginning of the allocated space. If the allocation failed, a NULL pointer is returned.
SEE ALSO
brk(2), calloc(3), getpagesize(3), malloc(3), realloc(3)
CAVEATS
Few limitations can be mentioned:
o The alloca() function is machine dependent; its use is discouraged.
o The alloca() function is slightly unsafe because it cannot ensure that the pointer returned points to a valid and usable block of memory.
The allocation made may exceed the bounds of the stack, or even go further into other objects in memory, and alloca() cannot determine
such an error. Avoid alloca() with large unbounded allocations.
o Since alloca() modifies the stack at runtime, it causes problems to certain security features. See security(7) for a discussion.
BSD
March 21, 2011 BSD