* [9fans] zero-length writes with rc
@ 2004-02-09 22:12 andrey mirtchovski
2004-02-09 22:22 ` Bruce Ellis
2004-02-10 0:08 ` rob pike, esq.
0 siblings, 2 replies; 4+ messages in thread
From: andrey mirtchovski @ 2004-02-09 22:12 UTC (permalink / raw)
To: 9fans
how do I make a zero-length write in an rc script? wikifs uses
zero-length write as a signal to 'commit' information about a wiki
page...
andrey
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [9fans] zero-length writes with rc
2004-02-09 22:12 [9fans] zero-length writes with rc andrey mirtchovski
@ 2004-02-09 22:22 ` Bruce Ellis
2004-02-09 22:31 ` andrey mirtchovski
2004-02-10 0:08 ` rob pike, esq.
1 sibling, 1 reply; 4+ messages in thread
From: Bruce Ellis @ 2004-02-09 22:22 UTC (permalink / raw)
To: 9fans
echo -n
----- Original Message -----
From: "andrey mirtchovski" <mirtchov@cpsc.ucalgary.ca>
To: <9fans@cse.psu.edu>
Sent: Tuesday, February 10, 2004 9:12 AM
Subject: [9fans] zero-length writes with rc
> how do I make a zero-length write in an rc script? wikifs uses
> zero-length write as a signal to 'commit' information about a wiki
> page...
>
> andrey
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [9fans] zero-length writes with rc
2004-02-09 22:22 ` Bruce Ellis
@ 2004-02-09 22:31 ` andrey mirtchovski
0 siblings, 0 replies; 4+ messages in thread
From: andrey mirtchovski @ 2004-02-09 22:31 UTC (permalink / raw)
To: 9fans
> echo -n
thought of that, but unfortunately it has to be done on the same fid
as the rest, so something like this won't work:
echo 'datadatadata' > file
echo -n >> file
(the second echo opens up a new transaction)
oh, got it:
{ echo 'datadatadata'; echo -n } > file
seems to work :)
thanx
(sorry, writing as I go...)
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [9fans] zero-length writes with rc
2004-02-09 22:12 [9fans] zero-length writes with rc andrey mirtchovski
2004-02-09 22:22 ` Bruce Ellis
@ 2004-02-10 0:08 ` rob pike, esq.
1 sibling, 0 replies; 4+ messages in thread
From: rob pike, esq. @ 2004-02-10 0:08 UTC (permalink / raw)
To: 9fans
a direct way is
syscall write 1 0 buf 2>/dev/null
echo -n works, too, but it's not obvious.
-rob
^ permalink raw reply [flat|nested] 4+ messages in thread
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2004-02-09 22:12 [9fans] zero-length writes with rc andrey mirtchovski
2004-02-09 22:22 ` Bruce Ellis
2004-02-09 22:31 ` andrey mirtchovski
2004-02-10 0:08 ` rob pike, esq.
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