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/* SPDX-License-Identifier: GPL-2.0 */ /* * An API to allow a function, that may fail, to be executed, and recover in a * controlled manner. * * Copyright (C) 2019, Google LLC. * Author: Brendan Higgins <[email protected]> */ #ifndef _KUNIT_TRY_CATCH_H #define _KUNIT_TRY_CATCH_H #include <linux/types.h> typedef void (*kunit_try_catch_func_t)(void *); struct completion; struct kunit; /** * struct kunit_try_catch - provides a generic way to run code which might fail. * @test: The test case that is currently being executed. * @try_completion: Completion that the control thread waits on while test runs. * @try_result: Contains any errno obtained while running test case. * @try: The function, the test case, to attempt to run. * @catch: The function called if @try bails out. * @context: used to pass user data to the try and catch functions. * * kunit_try_catch provides a generic, architecture independent way to execute * an arbitrary function of type kunit_try_catch_func_t which may bail out by * calling kunit_try_catch_throw(). If kunit_try_catch_throw() is called, @try * is stopped at the site of invocation and @catch is called. * * struct kunit_try_catch provides a generic interface for the functionality * needed to implement kunit->abort() which in turn is needed for implementing * assertions. Assertions allow stating a precondition for a test simplifying * how test cases are written and presented. * * Assertions are like expectations, except they abort (call * kunit_try_catch_throw()) when the specified condition is not met. This is * useful when you look at a test case as a logical statement about some piece * of code, where assertions are the premises for the test case, and the * conclusion is a set of predicates, rather expectations, that must all be * true. If your premises are violated, it does not makes sense to continue. */ struct kunit_try_catch { /* private: internal use only. */ struct kunit *test; struct completion *try_completion; int try_result; kunit_try_catch_func_t try; kunit_try_catch_func_t catch; void *context; }; void kunit_try_catch_run(struct kunit_try_catch *try_catch, void *context); void __noreturn kunit_try_catch_throw(struct kunit_try_catch *try_catch); static inline int kunit_try_catch_get_result(struct kunit_try_catch *try_catch) { return try_catch->try_result; } #endif /* _KUNIT_TRY_CATCH_H */