Re: [darwin-dev] n00b uiomove64 question, Was: Where is uwritec ?
Re: [darwin-dev] n00b uiomove64 question, Was: Where is uwritec ?
- Subject: Re: [darwin-dev] n00b uiomove64 question, Was: Where is uwritec ?
- From: Alexander von Below <email@hidden>
- Date: Mon, 1 Oct 2007 01:44:02 +0200
Thanks, it had not been answered!
Keeping state and returning 0 bytes works like intended!
Alex
Am 01.10.2007 um 01:27 schrieb Justin C. Walker:
On Sep 30, 2007, at 7:03 PM, Alexander von Below wrote:
Hello List,
I have another, hopefully simple question:
How can I signal that there is no more data to transfer? All I want
at this point is to transfer a certain number of characters per
read. My implementation of read looks somewhat like this:
int len;
char buf[1024];
len = snprintf(buf, 1024, "Hello World\n");
error = uiomove64((unsigned long long)buf, len, uio);
When I do cat /dev/mydevice, I get an ever-repeating "Hello World",
until I cancel with CTRL-C. How can I signal EOF?
My mail is squirrelly so I don't know whether this has been answered
(so this is off-list). Your read routine has to keep state: once
it's been called (for a particular "session" if you keep track of
that), you change state, and the next time, return 0 bytes.
Justin
--
Justin C. Walker, Curmudgeon-At-Large
Institute for the Absorption of Federal Funds
--------
If you're not confused,
You're not paying attention
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