Function Bun__linux_trace_emit 

#[unsafe(no_mangle)]
pub extern "C" fn Bun__linux_trace_emit(
    event_name: *const i8,
    duration_ns: i64,
) -> i32

Emit one complete event: event_name + duration_ns.

Returns 0 on success, non-zero on failure (not initialized / I/O error / null name). Never panics.