[lwip-devel] [bug #26397] SLIP polling support

[Simon Goldschmidt]

Follow-up Comment #7, bug #26397 (project lwip):

I thought sio_recv would not block since it is used that way in ppp.c: if it
returns 0, nothing has been read and a sleep(1) is executed. If it would
block, this would never happen.

However, the sio.h file isn't very well documented (or not documented at all,
rather) - the only documentation seems to be in the win32 port's sio.c file,
and sio_recv isn't documented there, too.

But to me it seems like sio_recv shouldn't block, and if so I think we should
keep the current behaviour to avoid upgrading problems. That way, we have
sio_read for blocking mode and sio_recv for non-blocking mode.

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