YAMAMOTO Takashi 0bae950b63 webclient: Implement non-blocking I/O
* webclient_perform
    * Add a new flag to use non-blocking mode (WEBCLIENT_FLAG_NON_BLOCKING)
    * Implement restarting

* Add a few associated API functions
    * webclient_get_poll_info: get the descriptor info for poll/select
    * webclient_abort: abort the operation (instead of restarting)
2021-08-08 22:34:26 -07:00
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