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soc_getsockopt: report the pending error for SO_ERROR - #611
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October 13, 2026 22:34
The SOC service doesn't wake a poll() waiting for POLLOUT when a non-blocking connect() completes, so poll() only returns once its timeout runs out (curl waits a second per new connection this way). It also reports a refused connection only as readable, so a POLLOUT waiter never learns about it. Wait for POLLOUT in 10 ms slices, and watch those sockets for POLLIN too: POLLIN without POLLOUT on a socket that then fails to receive is a failed connection, reported as POLLERR | POLLHUP. Nothing tells a socket that is still connecting from a connected one (getpeername() succeeds for both), so connected sockets waiting for POLLOUT are sliced as well. Waits for POLLIN alone are unchanged. Fixes the poll() part of devkitPro#412.
For SO_ERROR the service returns the result code of an earlier operation on the socket, in its own codes, instead of the socket's pending error: -26 (EINPROGRESS) after a non-blocking connect(), even once it has completed. Convert the code, and for the ones that aren't errors of the socket itself (EINPROGRESS, EALREADY, ENOTCONN, EAGAIN) report whether its connection failed instead: 0, or the reason (ECONNREFUSED for a refused connection). Fixes the SO_ERROR part of devkitPro#412.
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