Poll update

Initial pass at poll()ifying all the things (except utilities like sexyz)

There's still a few complicated bits to iron out.

Specifically, services_thread(), CGI stuff in websrvr.c, and sbbs_t::external()

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• 3e4e1881 - Initial poll() work

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• c8aa68ae - Implement poll() for services thread.

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• d6c5d539 - Update sbbs::external() for poll() usage

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• f880f279 - Use poll() instead of select() for CGI

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unmarked as a Work In Progress

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• ca8d87c4 - Use single-purpose socket_*() functions instead of socket_check

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• bba0b385 - Properly set buffer size when calling getsockopt()
• a61c48f6 - Return an error if calloc() fails allocating pollfd array.

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• bd81e6dd - free() fds before error returns.

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• f7073670 - free() fds on services recycle/terminate.
• 51b5704f - Handle error allocating poll() array

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• ca21735c - post_to_file() shouldn't close the file since it didn't open it.

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mentioned in commit 3971ef4d

merged

mentioned in commit 84f5e4c3