Does valgrind memcheck support checking mmap
c, c++, memory-leaks, mmap, valgrind
Solution
Not directly, it's very hard to debug, take a look to valgrind.h
VALGRIND_MALLOCLIKE_BLOCK should be put immediately after the point where a
heap block -- that will be used by the client program -- is allocated.
It's best to put it at the outermost level of the allocator if possible;
for example, if you have a function my_alloc() which calls
internal_alloc(), and the client request is put inside internal_alloc(),
stack traces relating to the heap block will contain entries for both
my_alloc() and internal_alloc(), which is probably not what you want.
For Memcheck users: if you use VALGRIND_MALLOCLIKE_BLOCK to carve out
custom blocks from within a heap block, B, that has been allocated with
malloc/calloc/new/etc, then block B will be *ignored* during leak-checking
-- the custom blocks will take precedence.
VALGRIND_FREELIKE_BLOCK is the partner to VALGRIND_MALLOCLIKE_BLOCK. For
Memcheck, it does two things:
- It records that the block has been deallocated. This assumes that the
block was annotated as having been allocated via
VALGRIND_MALLOCLIKE_BLOCK. Otherwise, an error will be issued.
- It marks the block as being unaddressable.
VALGRIND_FREELIKE_BLOCK should be put immediately after the point where a
heap block is deallocated.
Problem
I am trying valgrind for detecting memory leak. It works well on heap leak(i.e. memory allocation from malloc or new). however, does it support check mmap leaking in linux? Thanks Chang