Re: [Xen-devel] [RFC PATCH 4/8] libxl: wait up to 5s in libxl_console_exec for xenconsoled

[Ian Jackson <ian.jackson@xxxxxxxxxxxxx>]

Wei Liu writes ("[RFC PATCH 4/8] libxl: wait up to 5s in libxl_console_exec for 
xenconsoled"):
> Wait until the tty node is available before exec'ing xenconsole.

You shouldn't poll.  We have a perfectly good xenstore watch
mechanism.

You could either:

(a) do something ad-hoc with poll(), the xenstore fd, etc.

(b) make libxl_console_exec by a weird special case which starts an AO
but always synchronously (ie, doesn't take an ao_how), and then use
the existing libxl__xswait and a callback.

Doing the latter would mean that you would already have done half (a
third?) of the work for a future libxl_console_get_fd function.

Ian.

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