Hello, yelninei--- via Bug reports for the GNU Hurd, le lun. 01 sept. 2025 14:36:32 +0200, a ecrit: > Trying to use streamio with O_NONBLOCK and select results in select claiming > that the fd is readable but when trying to read returning EWOULDBLOCK. > > > Removing the O_NONBLOCK check in io_select_common makes select behave (I > tried with timeout of NULL, 0 and 10s)
This O_NONBLOCK check indeed looks wrong: select() is not supposed to be affected by O_NONBLOCK, and just block. Does your system work fine with that change? We should probably land it, patch welcome! > however the input_buffer stays empty forever so it is never woken up. Any > ideas? Does device_read_reply_inband get called with errorcode == D_WOULD_BLOCK? I wonder if in that case we'd be supposed to call start_input again, to make another device_read request. If that second request gets D_WOULD_BLOCK immediately, there is something wrong in the kernel driver itself that doesn't manage to let us block. Samuel
