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A talloc pool is a chunk of memory that can be used as a context for further
talloc calls. Allocations with the pool as the parent just chew from that
memory by incrementing a pointer. If the talloc pool is full, then we fall back
to the normal system-level malloc(3) to get memory.
The use case for talloc pools is the transient memory that is used for handling
a single SMB request. Incrementing a pointer will be way faster than any malloc
implementation.
There is a downside of this: If you use talloc_steal() to move something out of
the pool, the whole pool memory is kept around until the last object inside the
pool is freed. So if you talloc_free() the pool, it might happen that the
memory is freed later. So don't hang anything off a talloc pool that should
live long.
Volker
This also adds some more headers to the list that is installed and a couple of extra #include lines so these
headers can be used externally without problems.
meant for moving pointers between structures. The difference is that
talloc_move() will zero the source pointer, thus ensuring you don't
reference the pointer in the old context.
talloc_move() is appropriate in some, but not all cases where we use
talloc_steal() now. The interface came out of a discussion with
Jeremy.
to do the actual report.
- make the talloc_report_depth_file() a wrapper of it
- and talloc_report() and talloc_report_full() are wrapper of
talloc_report_depth_file()
metze
in very annoying ways for talloc_steal. This rather strange looking
cpp approach avoids these warnings. It's really a problem in gcc, but
better to do this than put up with the huge flood of warnings.
type safe. This only works on recent gcc versions. With other
compilers it reverts to a non-typesafe cast
The patch also ensures that talloc_free() does not change error on
systems where free() can change errno
have a structure that references one of its parents, and a parent of
that parent is freed, then the whole structure should be freed, not
just the reference.
this was found by the change notify code, as a side effect of fixing
the memory leak yesterday
These provide a way to find a parent of a ptr that is of a given
type. I will be using this to find the event context in smbd, relying
on the fact that everything is a child of the top level event
context. I did look at the alternatives, and found that passing the
event context to just about every call in smbd was getting way too
complex (we need to get it to anything that can do a ldb operation, as
that can invoke ldap).
So this method avoids a global, and seems to work nicely
the type names that talloc already keeps around for pointers, and
allows the user to type check void* private pointers. It can also be
used to implement polymorphism in C, as I'm sure someone would have
pointed out to me sooner or later :-)
- expanded the talloc_realloc() test a little (I was concerned about a
possible bug, which turned out to be an illusion)
- don't enable gcov by default in Makefile.talloc
- added #if TALLOC_DEPRECATED around the _p functions
- fixes the code that broke from the above
while doing this I fixed quite a number of places that were
incorrectly using the non type-safe talloc functions to use the type
safe ones. Some were even doing multiplies for array allocation, which
is potentially unsafe.
talloc_size() if you want the old behaviour.
I have kept talloc_p() as an alias for now. Once we change all calls
to be plain talloc() then we can remove it.
- cleaned up some talloc usage in various files
I'd like to get to the point that we have no calls to talloc(), at
which point we will rename talloc_p() to talloc(), to encourage
everyone to use the typesafe functions.
- added gcov flags to Makefile.talloc
- expanded talloc testsuite to add a test for realloc with a child ptr
- fixed a bug in talloc_realloc() with realloc of a ptr that has child ptrs
