CODEWITHSUNDEEP
c++visual-c++c++17visual-studio-2019
Andrew Tomazos
Andrew Tomazos

Reputation: 68738

Equivalent of segfault on Windows/MSVC?

On Linux, the following code:

long* p = (long*)reinterpret_cast<void*>(0x634963963496034) // random memory address
std::cout << *p;

will likely cause a read of memory that hasn't been allocated, and the program will raise a SIGSEGV signal. Otherwise known as a segfault. (An action can be attached via sigaction(2)).

Is there an equivalent mechanism on Windows / MSVC ?

What will the above code do on Windows? Is there any way to trap this memory access violation, and run a user-provided function?

Upvotes: 2

Views: 1024

Answers (2)

Andrew Tomazos
Andrew Tomazos

Reputation: 68738

What I was looking for was SetUnhandledExceptionFilter. SetUnhandledExceptionFilter on Windows is equivalent to sigaction on Linux for this use case.

Upvotes: 0

Andreas Wenzel
Andreas Wenzel

Reputation: 25396

On Windows, when catching the exception using Structured Exception Handling, the macro GetExceptionCode() will return EXCEPTION_ACCESS_VIOLATION.

It is also possible to use C++ exception handling to catch SEH exceptions, as described here.

Upvotes: 2

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