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Could it be because of the age of the codebase? When ICQ started the available TCP/IP stacks were not good enough and it doesn't make sense to refactor the whol

by pimeys 10y ago

Could it be because of the age of the codebase? When ICQ started the available TCP/IP stacks were not good enough and it doesn't make sense to refactor the whole project to use the system stack.

hal9000xp 10y ago
Yes, that's mostly true. In early days, native TCP/IP stacks wasn't good at handling so many simultaneous connections as ICQ needed to handle. So AOL just wrote their own TCP/IP stack (I think they used this implementation not only in ICQ). In modern days, it's legacy. I think they already removed this stack since I left company.