Function catch_unwind

pub unsafe extern "rust-intrinsic" fn catch_unwind(
    try_fn: fn(_: *mut u8),
    data: *mut u8,
    catch_fn: fn(_: *mut u8, _: *mut u8),
) -> i32

🔬This is a nightly-only experimental API. (core_intrinsics)

Rust’s “try catch” construct for unwinding. Invokes the function pointer try_fn with the data pointer data, and calls catch_fn if unwinding occurs while try_fn runs.

catch_fn must not unwind.

The third argument is a function called if an unwind occurs (both Rust panic and foreign unwinds). This function takes the data pointer and a pointer to the target- and runtime-specific exception object that was caught.

Note that in the case of a foreign unwinding operation, the exception object data may not be safely usable from Rust, and should not be directly exposed via the standard library. To prevent unsafe access, the library implementation may either abort the process or present an opaque error type to the user.

For more information, see the compiler’s source, as well as the documentation for the stable version of this intrinsic, std::panic::catch_unwind.