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this allows a ldb module to register a hook function called at various
stages of processing. It will be initially used for ldb command line
hooks, but should work generally.
Pair-Programmed-With: Andrew Bartlett <abartlet@samba.org>
this supports module loading in ldb which uses the approach of "load
all modules in a directory". This is much more flexible than the
current module loading, as it will allow us to load modules for
command line parsing and authentication.
Modules are loaded from a colon separated path, in the environment
variable LDB_MODULES_PATH. If unset, it defaults to LDB_MODULESDIR.
Within each directory modules are loaded recursively (traversing down
the directory tree). The device/inode number of each module is
remembered to prevent us loading a module twice.
Each module is checked for a ldb_init_module() function with
dlsym(). If found, it is called with the ldb module version as an
argument.
this is used to help debug async ldb requests. The ldb request handle
now contains a location string and the parent request pointer. This
allows us to print a backtrace of ldb requests in the dsdb modules.
To count LDB objects use variables of type "unsigned (int)" or "long long int"
on binary or downto searches.
To count characters in strings use "size_t".
To calculate differences between pointers use "ptrdiff_t".
The samldb module overrides the error code for some returns when
handling primaryGroupID. We need to take the error from the async
callback to allow this to work reliably
This helps pin down where errors occour, by printing a call stack and
setting error strings and trace messages in the transaction case.
Andrew Bartlett
When a top level method in a module returns an error, it is supposed
to call ldb_module_done(). We ran across a case where this wasn't
done, and then found that in fact that are hundreds of similar cases
in our modules. It took Andrew and I a full day to work out that this
was the cause of a subtle segv in another part of the code.
To try to prevent this happening again, this patch changes
ldb_next_request() to catch the error by checking if a module
returning an error has called ldb_module_done(). If it hasn't then the
call is made on behalf of the module.
The reason we need this is to make multi-tdb transactions safe, with
the partition module. The linked_attributes and repl_meta_data modules
now do extra processing when the transaction ends, and that processing
can fail. When it fails we need to cancel the transaction, which we
can only do if the hook is on the prepare commit instead of the end
transaction call. Otherwise the partition module cannot ensure that no
commit has been done on another partition.
Separate again the public from the private headers.
Add a new header specific for modules.
Also add service function for modules as now ldb_context and ldb_module are
opaque structures for them.
Current glibc libraries include a function called init_module(). If we
use the same name, then a dlsym() can find the glibc function if the
module doesn't have an initialisation function.
In ldb, none of our modules have an init_module(), so we end up calling the libc
functions with bogus arguments.
(This used to be commit 1b0621068998590e7b1e9528b78744dcd2cd5909)
Conflicts:
source/build/smb_build/header.pm
source/build/smb_build/makefile.pm
source/lib/ldb/include/ldb_private.h
(This used to be commit 1a646af0647f021d99473a8991c35e616a423ea6)
