⁉️ Interview question
How does Python’s mmap module behave when mapping a file that is concurrently being truncated by another process using os.ftruncate()? What are the implications for memory safety, and under what conditions might this lead to segmentation faults or undefined behavior?

When a file is mapped via `mmap` and simultaneously truncated by another process, the virtual memory pages remain valid until accessed. However, if the mapped region refers to data beyond the new file size, accessing those pages results in undefined behavior, potentially causing segmentation faults. The operating system may not immediately invalidate the mappings, leading to crashes or data corruption. This scenario highlights the need for synchronization mechanisms like file locks or signals to ensure safe concurrent access

#️⃣ tags: #Python #AdvancedPython #FileHandling #MemoryMapping #mmap #ConcurrentProgramming #OS #SystemCalls #UndefinedBehavior #SegmentationFault #FileLocking

By: t.iss.one/DataScienceQ 🚀