From owner-freebsd-questions  Fri May 25 14: 0:53 2001
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Date: Fri, 25 May 2001 14:00:48 -0700
From: Doug Barton <DougB@DougBarton.net>
Organization: Triborough Bridge & Tunnel Authority
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To: boshea@ricochet.net
Cc: freebsd-questions@FreeBSD.ORG
Subject: Re: tail(1) uses kqueue, which doesn't seem to work on NFS filesystems
References: <20010515161052.O1813@shaolin.hq.netapp.com>
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Brian O'Shea wrote:

> I noticed in the code for tail(1) (src/usr.bin/tail/forward.c) that
> there is a local variable in the forward() function called "action"
> which seems to control weather or not tail uses sleep or kqueue (it
> seems to be assigned one of three values at various times, defined
> respectively to be USE_SLEEP, USE_KQUEUE, and ADD_EVENTS).  However, it
> isn't clear to me from looking at the code if this variable can be used
> to disable the use of kqueue.

	The built in logic should be able to handle this. Can you try the attached
patch and see if you're actually using kqueue in your problematic case? 

Thanks,

Doug
-- 
    I need someone really bad. Are you really bad?
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Index: forward.c
===================================================================
RCS file: /usr/ncvs/src/usr.bin/tail/forward.c,v
retrieving revision 1.25
diff -u -r1.25 forward.c
--- forward.c	2001/03/28 13:10:17	1.25
+++ forward.c	2001/05/25 20:56:13
@@ -211,8 +211,10 @@
 				close(kq);
 				kq = -1;
 				action = USE_SLEEP;
+				(void)fprintf(stderr, "Using sleep\n");
 			} else {
 				action = USE_KQUEUE;
+				(void)fprintf(stderr, "Using kqueue\n");
 			}
 			break;
 		}

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