ZDTM API

This page describes the API one should use to write new test in ZDTM.

API for test itself

The test should clearly describe 3 stages:

Preparations

These are actions that test does before the process(es) get checkpointed

Actions

During this the process(es) will be interrupted at arbitrary place and get dumped

Checks

After restore test should verify whether everything is OK or not and report the result

This is achieved by using the following API calls:

test_init(argc, argv)

Just initializes the test subsystem. After this call the preparations stage starts.

test_daemon()

This one says that we finished preparations and ready to get dumped at any time. I.e. -- the actions begin.

test_go()

This routine checks whether the process was dumped and restored or not yet, i.e. the actions stage still goes on.

test_waitsig()

Calling this blocks the task till it's restored. After this the checks stage starts.

pass()

Calling this marks test as PASSED

fail(message)

Calling this would report test failure. The message argument will be written into logs

err(message)

Use this function to mark the test as being unable to work at all.

test_msg(message)

This is for logging.

From the code perspective this looks like this:

int main(int argc, char **argv)
{
	test_init(argc, argv);

	/* Preparations */

	test_daemon();

#if test want to act and get c/r-ed unexpectedly
	while (test_go()) {
		/* Actions go here */
	}
#else test just want to wait for c/r to happen
	/* Actions go here. */

	test_waitsig();
#endif

	/* checks */

	if (test_passed())
		pass();
	else
		fail("Something went wrong");

	return 0;
}