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a const pointer really means that "the data pointed to by this pointer
won't change", and that is certainly true of talloc(). The fact that
some behind-the-scenes meta-data can change doesn't matter from the
point of view of const.
this fixes a number of const warnings caused by const data structures
being passed as talloc contexts. That will no longer generate a
warning.
also changed the talloc leak reporting option from --leak-check to
--leak-report, as all it does is generate a report on exit. A new
--leak-report-full option has been added that shows the complete tree
of memory allocations, which is is quite useful in tracking things down.
NOTE: I find it quite useful to insert talloc_report_full(ptr, stderr)
calls at strategic points in the code while debugging memory
allocation problems, particularly before freeing a major context (such
as the connection context). This allows you to see if that context has
been accumulating too much data, such as per-request data, which
should have been freed when the request finished.
and can't properly handle leaks of doubly linked lists which we use a
lot (as the memory is always reachable). Even with --show-reachable
its hard to track leaks down sometimes.
I realised that talloc does have the necessary information to track
these, and by using the cascading property of the new talloc it can
report on leaks in a much more succinct fashion than valgrind can.
I have added a new samba option --leak-check that applies to all Samba
tools. When enabled it prints a leak report summarising all top level
contexts that are present when the program exits. A typical report
looks like this:
talloc report on 'null_context' (total 1071 bytes in 52 blocks)
iconv(CP850,UTF8) contains 43 bytes in 3 blocks
UNNAMED contains 24 bytes in 1 blocks
UNNAMED contains 24 bytes in 1 blocks
dcesrv_init contains 604 bytes in 26 blocks
server_service contains 120 bytes in 6 blocks
UNNAMED contains 24 bytes in 1 blocks
UNNAMED contains 24 bytes in 1 blocks
server_service contains 104 bytes in 4 blocks
server_context contains 12 bytes in 2 blocks
iconv(UTF8,UTF-16LE) contains 46 bytes in 3 blocks
iconv(UTF-16LE,UTF8) contains 46 bytes in 3 blocks
the numbers are recursive summaries for all the memory hanging off each context.
this option is not thread safe when used, but the code is thread safe
if the option is not given, so I don't think thats a problem.
