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In Open5GS 2.7.x, when using curl 8.x with external epoll, an issue occurred where the peer connection was closed, triggering EPOLLERR. At this point, POLL_OUT should have been set to trigger the write event handler, invoking `event_cb()` and calling `curl_multi_socket_action`. This would allow `curl_multi_info_read` to execute without blocking. However, when `event_cb()` wasn't invoked, `curl_multi_socket_action` was not called, causing `curl_multi_info_read` to block. This resulted in a busy loop in epoll, continuously checking for the closed peer connection. This issue specifically affects Open5GS 2.7.x with curl 8.x, and is observed on Ubuntu versions starting from **noble** and later. It does not occur on Ubuntu Jammy. The solution involves globally ignoring SIGPIPE and fixing the epoll logic to ensure POLL_OUT is triggered when EPOLLERR occurs, allowing `curl_multi_socket_action` to be invoked and `curl_multi_info_read` to run non-blocking. This resolves the busy loop and connection issues caused by peer disconnects when using curl 8.x and external epoll. This fix improves the stability and performance of Open5GS when used with curl 8.x and Ubuntu versions **noble** and above.
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