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MatkovIvan avatar MatkovIvan commented on July 24, 2024

Hi @jackieyk,

Thanks for getting in touch!
It's expected - by design PLCrashReporterCallbacks calls after writing the crash to disk. Also, this callback has significant limitations, and cannot be considered as regular "on crash callback". Please read that doc for details:

plcrashreporter/Source/CrashReporter.h

Lines 213 to 239 in 81cdec2

/**
* @page async_safety Async-Safe Programming Guide
*
* Plausible CrashReporter provides support for executing an application specified function in the context of the
* crash reporter's signal handler, after the crash report has been written to disk. This was a regularly requested
* feature, and provides the ability to implement application finalization in the event of a crash. However, writing
* code intended for execution inside of a signal handler is exceptionally difficult, and is not recommended.
*
* @section program_flow Program Flow and Signal Handlers
*
* When the signal handler is called the normal flow of the program is interrupted, and your program is an unknown
* state. Locks may be held, the heap may be corrupt (or in the process of being updated), and your signal
* handler may invoke a function that was being executed at the time of the signal. This may result in deadlocks,
* data corruption, and program termination.
*
* @section functions Async-Safe Functions
*
* A subset of functions are defined to be async-safe by the OS, and are safely callable from within a signal handler. If
* you do implement a custom post-crash handler, it must be async-safe. A table of POSIX-defined async-safe functions
* and additional information is available from the
* <a href="https://www.securecoding.cert.org/confluence/display/seccode/SIG30-C.+Call+only+asynchronous-safe+functions+within+signal+handlers">CERT programming guide - SIG30-C</a>
*
* Most notably, the Objective-C runtime itself is not async-safe, and Objective-C may not be used within a signal
* handler.
*
* @sa PLCrashReporter::setCrashCallbacks:
*/

The same is for customData - it's by design that it must be set before the crash. The reasons are similar.

from plcrashreporter.

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