4 ms·
you lose explicit error handling I've never had to use mmap but this is always been the issue in my head. If you're treating I/O as memory pages, what happens
by commandersaki 10mo ago
you lose explicit error handling
I've never had to use mmap but this is always been the issue in my head. If you're treating I/O as memory pages, what happens when you read a page and it needs to "fault" by reading the backing storage but the storage fails to deliver? What can be said at that point, or does the program crash?
- kennethallen 10mo agoIf you fail to load an mmapped page because of an I/O error, Unix-like OSes interrupt your program with SIGBUS/SIGSEGV. It might be technically possible to write a program that would handle those signals and recover, but it seems like a lot more work and complexity than just checking errno after a read system call.