implement reproducible talloc context printout, i.e. without memory addresses
In some tests (e.g. osmo-msc/tests/msc_vlr/msc_vlr_tests.c) we want to expect a specific non-empty talloc context, and it would be best to print a summary and verify against it in test.ok or test.err output. However, the talloc_report* functions print memory addresses that change for every invocation, and hence cannot be used easily for automatic verification.
Implement a talloc table walker similar to what Vadim has done for the "show talloc-context" VTY code.
Use it in msc_vlr_tests.c to add to expected output, and remove that comment added in https://gerrit.osmocom.org/4927 aka If92a18bb3dc24c2cf6498aa2da29266267488240
#1 Updated by laforge about 1 year ago
- Category set to libosmocore
- Assignee set to Osmocom CNI Developers
This could also be useful in the context of TTCN3 tests. If there was a way to obtain a talloc report without address information via the VTY, it could be queried using the existing VTY interface code we have in TTCN3, in order to verify no memory leaks occurred during the execution of a given (or at some point, hopefully each) test case.
Some general tips / ideas:
- the talloc_ctx_walk_cb() needs to be moved from libosmovty to libosmocore;
- it should accept a pointer to the target char buffer instead of printing directly to the VTY;
- it should accept a bitmask ('flags') where the caller can indicate whether to print addresses, references, etc. or not;
- one of the flags (e.g. OSMO_BLABLA_F_VTY) should indicate the need to use VTY-specific new line symbol (i.e. VTY_NEWLINE).