As of 3.12 `_lsprof` no longer calls `_PyEval_SetProfile` making `sys.getprofile()` useless with `cProfile`

Bug report

Bug description:

Starting in 3.12 with the addition of sys.monitoring, _lsprof, specifically in profiler_enable, no longer calls _PyEval_SetProfile.

Very specifically, this impacts previous functionality where python -m cProfile -m whatever would result in sys.setprofile() being called, and subsequently the whatever module could access the profiler object via sys.getprofile()

To my knowledge this is now completely impossible as sys.monitoring provides no meaningful way to access the profiler object.

In my particular use case, profiling could be enabled within the application, or if python -m cProfile was used, the existing profiler could be used allowing profiling to happen earlier than the enablement point of cProfile within the application.

Something to the effect of:

p = sys.getprofile()
if p is None:
    p = cProfile.Profile()
    p.enable()

CPython versions tested on:

3.13

Operating systems tested on:

Linux

Inizia tracciando il comportamento di profiler_enable di _lsprof e la sua relazione con _PyEval_SetProfile, quindi confronta il comportamento di python -m cProfile -m whatever tra la 3.11 e la 3.12. Verifica come interagiscono sys.getprofile(), cProfile e sys.monitoring; il lavoro è completato quando l’oggetto profiler previsto rimane accessibile senza compromettere il design del monitoring dalla 3.12 in poi.