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Nested if's are hard to understand to me.
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Autobuild-User: Volker Lendecke <vlendec@samba.org>
Autobuild-Date: Mon Jan 2 19:07:23 CET 2012 on sn-devel-104
The version change is needed because the ABI file
of the pytalloc code was fixed.
metze
Autobuild-User: Stefan Metzmacher <metze@samba.org>
Autobuild-Date: Thu Sep 15 22:32:59 CEST 2011 on sn-devel-104
This ensures that the sibling list of a pointer doesn't become invalid
during a free operation. It is an alternative fix to the fix in
6f51a1f45b, and avoids the problem of
trying to calculate the parent pointer early
This should fix the subtle spoolss talloc bug that Simo found
Autobuild-User: Andrew Tridgell <tridge@samba.org>
Autobuild-Date: Tue Aug 9 01:53:17 CEST 2011 on sn-devel-104
Otherwise tc->name will end up pointing to garbage when it is not
set to a const but rather to a string allocate as child of the context itself.
Signed-off-by: Andrew Tridgell <tridge@samba.org>
*talloc_pool_objectcount(pool_tc) == 2 doesn't mean the one of the objects
is the pool itself! So we better check for == 1 and calculate the chunk count.
metze
The optimization of the object_count == 1 case should only happen
for when we're not destroying the pool itself. And it should only
happen if the pool itself is still valid.
If the pool isn't valid (it has TALLOC_FLAG_FREE),
object_count == 1 does not mean that the pool is the last object,
which can happen if you use talloc_steal/move() on memory
from the pool and then free the pool itself.
Thanks to Volker for noticing this!
metze
If we optimize on top of raw realloc() we need
TC_INVALIDATE_SHRINK_CHUNK together with TC_UNDEFINE_GROW_CHUNK
(with was missing and caused false positive valgrind warnings).
But that is really slow, as we do a lot of talloc_realloc calls in samba.
That's why we only to TC_UNDEFINE_SHRINK_CHUNK() for now.
metze
metze
Signed-off-By: Andrew Tridgell <tridge@samba.org>
Autobuild-User: Stefan Metzmacher <metze@samba.org>
Autobuild-Date: Fri Apr 8 10:15:41 CEST 2011 on sn-devel-104
- Fix some typos
- Document better the differences in the behaviour between talloc 1.X and 2.X.
Previously this seemed a bit spongy to me.
Reviewed-by: Jelmer + Tridge
Autobuild-User: Matthias Dieter Wallnöfer <mdw@samba.org>
Autobuild-Date: Mon Apr 4 11:05:42 CEST 2011 on sn-devel-104
this uses a temporary waf lock file to force the build directory
Autobuild-User: Andrew Tridgell <tridge@samba.org>
Autobuild-Date: Sat Jan 8 02:35:22 CET 2011 on sn-devel-104
this is the minimal fix for the problem Rusty found. I previously
thought that the best fix would be to change tc->parent to be valid
for all pointers, but that is expensive for realloc with large numbers
of child pointers, which is much more commmon than I expected it to
be.
Autobuild-User: Andrew Tridgell <tridge@samba.org>
Autobuild-Date: Wed Jan 5 07:22:27 CET 2011 on sn-devel-104
This should not change any behaviour - the intent is just to reduce
the "nuisance" warnings.
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Autobuild-User: Stefan Metzmacher <metze@samba.org>
Autobuild-Date: Mon Jan 3 11:12:39 CET 2011 on sn-devel-104
This function is a wrapper around waf's check_python_header.
It avoids searching more than once for the headers bringing a small
speed improvement and a better lisibility of the logs.
But it's mainly to avoid a nasty bug when python libraries are in path
pointed by python_LIBPL (ie. /usr/local/lib/python2.6/config/) instead
of python_LIBDIR (ie. /usr/local/lib).
On the first call waf will correctly find that in order to link with
python libs it needs to add -L$python_LIBPL.
But on the next calls of check_python_headers, waf will use both the
current library path value (ie. -L/usr/local/lib/python2.6/config) and
-L$python_LIBDIR (ie. /usr/local/lib/) which will make him beleive that
python libraries are in $python_LIBDIR which at the end will make the
final link test fails in check_python_headers as it will not use the
good directory.
So by avoiding calling check_python_headers more than once we avoid
making waf fooling itself.
we need the vnum for ABI checking for public libraries built as
private libraries when bundled
Autobuild-User: Andrew Tridgell <tridge@samba.org>
Autobuild-Date: Thu Dec 9 12:47:41 CET 2010 on sn-devel-104
This changes our version-script generation to use the ABI files that
are saved in git with each version number change of our public
libraries.
We use these ABI files to generate a linker version script that gives
the exact version number that each symbol was introduced. This
provides us with automatic fine grained symbol versioning.
Pair-Programmed-With: Jelmer Vernooij <jelmer@samba.org>
Pair-Programmed-With: Andrew Bartlett <abartlet@samba.org>
this is only set when rpath is used on install. It ensures that
applications that link against Samba libraries get the rpath right
Autobuild-User: Andrew Tridgell <tridge@samba.org>
Autobuild-Date: Wed Dec 8 12:46:00 CET 2010 on sn-devel-104
when this environment variable is set, talloc will fill freed memory
with the value from that environment variable. This can be used to
help find use after free bugs when valgrind is too slow to be used
this avoids using the non-portable shell command in makefiles
Autobuild-User: Andrew Tridgell <tridge@samba.org>
Autobuild-Date: Wed Nov 3 22:44:59 UTC 2010 on sn-devel-104
as these files are checked in, and the source might not be available.
Autobuild-User: Jelmer Vernooij <jelmer@samba.org>
Autobuild-Date: Sun Oct 31 22:27:56 UTC 2010 on sn-devel-104
The new waf-based build system now has all the same functionality, and
the old build system has been broken for quite some time.
Autobuild-User: Jelmer Vernooij <jelmer@samba.org>
Autobuild-Date: Sun Oct 31 02:01:44 UTC 2010 on sn-devel-104
We need to use 'libtalloc.so.1' as soname, otherwise the
compat library is useless.
metze
Autobuild-User: Stefan Metzmacher <metze@samba.org>
Autobuild-Date: Wed Oct 27 03:53:21 UTC 2010 on sn-devel-104
Those type of objects are referenced every time we assign
them to other py_talloc objects, which leads to runtime
warnings that we are trying to free an object with references
Wrap talloc_unlink() in SMB_ASSERT() to ensure we catch possible failure
Autobuild-User: Kamen Mazdrashki <kamenim@samba.org>
Autobuild-Date: Wed Oct 20 21:37:06 UTC 2010 on sn-devel-104
py_talloc_steal() was implemented as a macro which evaluated it's 2nd
argument twice. It was often called via a macro with a 2nd argument
that was a function call, for example an allocation in
py_talloc_new(). This meant it allocated memory twice, and leaked one
of them.
This re-implements py_talloc_steal() as a function, so that it only
does the allocation once.
when a ptr has a single reference and a NULL parent, then
talloc_free(ptr) is not ambiguous, as the caller could not have done a
talloc_free(NULL) to free the memory
Pair-Programmed-With: Rusty Russell <rusty@samba.org>
- use 'va_list' instead of 'struct __va_list_tag *'
Using the C name for va_list is preferable
- add support for negative ABI name matches in abi_match=. That is
used to exlude ldb_*module_ops from the ldb ABI
- don't include the ldb module ops or backend ops in the ABI
this allows the RPM spec file to be used with only a tiny mod (using
autogen-waf.sh instead of autogen.sh and using ln -sf for the library
links instead of ln -s)
Pair-Programmed-With: Andrew Bartlett <abartlet@samba.org>
when we use a system version of a library such as talloc, then we
no longer get the automtica dependency propogation of talloc implying
libreplace. That means we don't get the includes for libreplace, which
means things can fail to build.
To fix this this change adds an implied_deps option to
CHECK_BUNDLED_SYSTEM(), which tells the samba_deps module to add an
implied dependency on the listed targets if the system library is
chosen.
distros can set --bundled-libraries=NONE to force use of all system
libraries. If the right version isn't found then configure will fail.
Users may choose which libraries to use from the system, and which to
use bundled libs. The default is to try system libs, and use them if
their version matches the one in the source tree.
When we have a system talloc library, we still need to grab pytalloc.h
from lib/talloc. We don't want to just use -Ilib/talloc, as otherwise
we'll get the in-tree talloc.h which may not be compatible with the
system talloc.h
So we need to give the path to pytalloc.h
This should make it easier to keep all release scripts alined as it will reduce
the difference between them to ideally a few variables
Also moves the tdb script in the scripts directory.
If ALWASY_REALLOC is defined and we are to 'shrink' memory block,
memcpy() will write outside memory just allocated.
Signed-off-by: Andrew Tridgell <tridge@samba.org>
Make sure we always have a sorted (per file) export file.
This way we can directly compare the real export and the check file w/o having
to further sort things.
Also return error code from abi_checks.sh if warnings were reported
When we disable null tracking, we need to move any existing objects
that are under the null_context to be parented by the true NULL
context.
We also need a new talloc_enable_null_tracking_no_autofree() function,
as the talloc testsuite cannot cope with the moving of the autofree
context under the null_context as it wants to check exact counts of
objects under the null_context, and smbtorture has a large number of
objects in the autofree_context from .init functions
It's annoying when you use
p talloc_report_full(ctx, fopen("/tmp/xx","w"))
in gdb, and if you don't have write permission on the file then
you get a segv.
If NULL tracking is enabled after the autofree context is initialised
then autofree ends up separate from the null_context. This means that
talloc_report_full() doesn't report the autofree context. Fix this by
reparenting the autofree context when we create the null_context.
When we get a double free abort from talloc it is often hard to work
out where the first free came from. This patch takes advantage of the
fact that _talloc_free() now takes a location the free was called from
to allow the double free abort code to print the location of the first
free that conflicts.
USAGE: abi_checks.sh LIBRARY_NAME header1 [header2 ...]
This creates symbol signature lists using the mksyms and mksigs scripts
and compares them with the checked in lists.
Michael
This produces output like the output gcc produces when
invoked with the -aux-info switch.
Run like this: cat talloc.h | ./script/mksigs.pl
This simple parser is probably too coarse to handle all possible
header files, but it does treat talloc.h correctly.
Michael
We also use the major and minor versions in the TALLOC_MAGIC,
so that we can detect if two conflicting versions of talloc
are loaded in one process. In this case we use talloc_log() to
output a very useful debug message before we call
talloc_abort().
metze
This is needed to prevent samba3 and samba4 from using an ABI
incompatible system version of talloc
See ongoing discussion on the samba-technical mailing list
These changes follow from the discussions on samba-technical. The
changes are in several parts, and stem from the inherent ambiguity
that was in talloc_free() and talloc_steal() when the pointer that is
being changes has more than one parent, via references.
The changes are:
1) when you call talloc_free() on a pointer with more than one parent
the free will fail, and talloc will log an error to stderr like this:
ERROR: talloc_free with references at some/foo.c:123
reference at other/bar.c:201
reference at other/foobar.c:641
2) Similarly, when you call talloc_steal() on a pointer with more
than one parent, the steal will fail and talloc will log an error to
stderr like this:
ERROR: talloc_steal with references at some/foo.c:123
reference at other/bar.c:201
3) A new function talloc_reparent() has been added to change a parent
in a controlled fashion. You need to supply both the old parent and
the new parent. It handles the case whether either the old parent was
a normal parent or a reference
The use of stderr in the logging is ugly (and potentially dangerous),
and will be removed in a future patch. We'll need to add a debug
registration function to talloc.
The previous code caused memory leaks, and also caused situations
where talloc_free could be called on pointers with multiple parents
The new approach is to have two functions:
py_talloc_import : steals the pointer, so it becomes wholly owned by
the python object
py_talloc_reference: uses a reference, so it is owned by both python
and C
This is a first attempt at exporting symbols only for public functions
We also provide a rudimentary ABI checker that tries to check that
function signatures are not changed by mistake.
Given our use of macros this is not an API checker.
It's all based on talloc.h contents and the gcc -aux-info option
