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Side by Side Diff: util/mach/exc_server_variants.h

Issue 566693003: ExcCrashRecoverOriginalException() (Closed) Base URL: https://chromium.googlesource.com/crashpad/crashpad@master
Patch Set: Created 6 years, 3 months ago
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1 // Copyright 2014 The Crashpad Authors. All rights reserved. 1 // Copyright 2014 The Crashpad Authors. All rights reserved.
2 // 2 //
3 // Licensed under the Apache License, Version 2.0 (the "License"); 3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License. 4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at 5 // You may obtain a copy of the License at
6 // 6 //
7 // http://www.apache.org/licenses/LICENSE-2.0 7 // http://www.apache.org/licenses/LICENSE-2.0
8 // 8 //
9 // Unless required by applicable law or agreed to in writing, software 9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS, 10 // distributed under the License is distributed on an "AS IS" BASIS,
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422 mach_msg_type_number_t old_state_count, 422 mach_msg_type_number_t old_state_count,
423 thread_state_t new_state, 423 thread_state_t new_state,
424 mach_msg_type_number_t* new_state_count, 424 mach_msg_type_number_t* new_state_count,
425 bool* destroy_complex_request) override; 425 bool* destroy_complex_request) override;
426 426
427 private: 427 private:
428 internal::SimplifiedExcServer exc_server_; 428 internal::SimplifiedExcServer exc_server_;
429 internal::SimplifiedMachExcServer mach_exc_server_; 429 internal::SimplifiedMachExcServer mach_exc_server_;
430 }; 430 };
431 431
432 //! \brief Recovers the original exception, first exception code, and signal
433 //! from the encoded form of the first exception code delivered with
434 //! `EXC_CRASH` exceptions.
435 //!
436 //! `EXC_CRASH` exceptions are generated when the kernel has committed to
437 //! terminating a process as a result of a core-generating POSIX signal and, for
438 //! hardware exceptions, an earlier Mach exception. Information about this
439 //! earlier exception and signal is made available to the `EXC_CRASH` handler
440 //! via its `code[0]` parameter. This function recovers the original exception,
441 //! the value of `code[0]` from the original exception, and the value of the
442 //! signal responsible for process termination.
443 //!
444 //! \param[in] code_0 The first exception code (`code[0]`) passed to a Mach
445 //! exception handler in an `EXC_CRASH` exception. It is invalid to call
446 //! this function with an exception code from any exception other than
447 //! `EXC_CRASH`.
448 //! \param[out] original_code_0 The first exception code (`code[0]`) passed to
449 //! the Mach exception handler for a hardware exception that resulted in the
450 //! generation of a POSIX signal that caused process termination. If the
451 //! signal that caused termination was not sent as a result of a hardware
452 //! exception, this will be `0`. Callers that do not need this value may
453 //! pass `NULL`.
454 //! \param[out] signal The POSIX signal that caused process termination. Callers
455 //! that do not need this value may pass `NULL`.
456 //!
457 //! \return The original exception for a hardware exception that resulted in the
458 //! generation of a POSIX signal that caused process termination. If the
459 //! signal that caused termination was not sent as a result of a hardware
460 //! exception, this will be `0`.
461 exception_type_t ExcCrashRecoverOriginalException(
462 mach_exception_data_type_t code_0,
463 mach_exception_data_type_t* original_code_0,
464 int* signal);
465
432 //! \brief Computes an approriate successful return value for an exception 466 //! \brief Computes an approriate successful return value for an exception
433 //! handler function. 467 //! handler function.
434 //! 468 //!
435 //! For exception handlers that respond to state-carrying behaviors, when the 469 //! For exception handlers that respond to state-carrying behaviors, when the
436 //! handler is called by the kernel (as it is normally), the kernel will attempt 470 //! handler is called by the kernel (as it is normally), the kernel will attempt
437 //! to set a new thread state when the exception handler returns successfully. 471 //! to set a new thread state when the exception handler returns successfully.
438 //! Other code that mimics the kernel’s exception-delivery semantics may 472 //! Other code that mimics the kernel’s exception-delivery semantics may
439 //! implement the same or similar behavior. In some situations, it is 473 //! implement the same or similar behavior. In some situations, it is
440 //! undesirable to set a new thread state. If the exception handler were to 474 //! undesirable to set a new thread state. If the exception handler were to
441 //! return unsuccessfully, however, the kernel would continue searching for an 475 //! return unsuccessfully, however, the kernel would continue searching for an
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475 //! \a behavior is not a state-carrying behavior, or when it is a 509 //! \a behavior is not a state-carrying behavior, or when it is a
476 //! state-carrying behavior and \a set_thread_state is `true`. 510 //! state-carrying behavior and \a set_thread_state is `true`.
477 //! `MACH_RCV_PORT_DIED` is used when \a behavior is a state-carrying 511 //! `MACH_RCV_PORT_DIED` is used when \a behavior is a state-carrying
478 //! behavior and \a set_thread_state is `false`. 512 //! behavior and \a set_thread_state is `false`.
479 kern_return_t ExcServerSuccessfulReturnValue(exception_behavior_t behavior, 513 kern_return_t ExcServerSuccessfulReturnValue(exception_behavior_t behavior,
480 bool set_thread_state); 514 bool set_thread_state);
481 515
482 } // namespace crashpad 516 } // namespace crashpad
483 517
484 #endif // CRASHPAD_UTIL_MACH_EXC_SERVER_VARIANTS_H_ 518 #endif // CRASHPAD_UTIL_MACH_EXC_SERVER_VARIANTS_H_
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