dlclose crashing in 64bit Post: 302098568

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Top Forums Programming dlclose crashing in 64bit Post 302098568 by jim mcnamara on Tuesday 5th of December 2006 05:44:31 AM

12-05-2006

Registered User

If it is on different hardware platforms then it's possible. SIGBUS usually means alignment problems - instead of a pointer being aligned on a page boundary or a longword boundary, it's off by a few bytes. Or, more likely, it references an address that is off.

The reason I suggested corruption (or something is changing the value) is because
the code obviously worked earlier in the code - dlclose is called after you're done.
The pointer "worked" earlier.

I'm guessing you are probably overwriting the stack somewhere earlier in the code.

Now, if you suspect the compilation issue, then compile locally, and do a test run. If problems go away, then you have runtime library differences from box to box that are trashing the pointer.

See the post by driver about tracking down mysterious corruption:
https://www.unix.com/programming/20704-memory-stack-problem.html

jim mcnamara

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LEARN ABOUT HPUX

memalign

memalign(3C)															      memalign(3C)

NAME

       memalign() - allocate aligned memory

SYNOPSIS

DESCRIPTION

       allocates  space  for a block of size bytes, whose address is a multiple of boundary.  The space is not initialized. The boundary must be a
       power of 2.

EXTERNAL INFLUENCES

       employs the allocator.  For tuning information, see the malloc(3C) man page.

RETURN VALUE

       Upon successful completion, returns a pointer to space aligned to a multiple of boundary.  Otherwise, it returns a NULL pointer.

DIAGNOSTICS

       returns a NULL pointer if there is no available memory, or if the value of boundary is not a power of 2.

ERRORS

	      sets     to and returns a NULL pointer when an out-of-memory condition arises.

	      sets     to and returns a NULL pointer when the value of boundary is not a power of 2.

	      sets     to and returns a NULL pointer when the memory being managed by has been detectably corrupted.

WARNINGS

       For warnings, see the malloc(3C) man page.

SEE ALSO

       thread_safety(5).

STANDARDS CONFORMANCE

       There appear to be no standards applicable to Some implementations do not check that boundary is a power of 2.  The HP-UX implementation is
       not derived from any predecessor.

																      memalign(3C)