[Xen-devel] How to use XS_WATCH in

To:	xen-devel@xxxxxxxxxxxxxxxxxxx
Subject:	[Xen-devel] How to use XS_WATCH in
From:	胡少龙 <sunofblack@xxxxxxxx>
Date:	Sun, 5 Sep 2010 09:43:10 +0800 (CST)
Delivery-date:	Sat, 04 Sep 2010 18:44:23 -0700
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Hi,

I want to know how to use XS_WATCH, i assume first i do as fellow:

struct xsd_sockmsg msg;
msg.type=XS_WATCH;

write_request((char*)msg, sizeof(msg));
write_request(path, path_length);

struct evtchn_send event;
event.port=xenstore_event;
hypercall_event_channel_op(EVTCHNOP_send, &event);

after that, what should i do? does it just block in 
hypercall_event_channel_op() until the value in xenstore specified by path is 
changed , and when it return ,i can read the changed value by the responds msg?





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[Xen-devel] How to use XS_WATCH in