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Date: Thu, 7 Aug 1997 05:30:02 -0700 (PDT)
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From: David Greenman <dg@root.com>
Subject: Re: kern/4243: file locking doesn't work for pipe 
Reply-To: David Greenman <dg@root.com>
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The following reply was made to PR kern/4243; it has been noted by GNATS.

From: David Greenman <dg@root.com>
To: tetsuya@secom-sis.co.jp
Cc: FreeBSD-gnats-submit@FreeBSD.ORG
Subject: Re: kern/4243: file locking doesn't work for pipe 
Date: Thu, 07 Aug 1997 05:22:17 -0700

 >In flock() in /sys/kern/kern_descrip.c, the following statement:
 >
 >    f (fp->f_type != DTYPE_VNODE)
 >	    return (EOPNOTSUPP);
 >
 >rejects the file descriptor if fp->f_type == DTYPE_PIPE.
 >F_SETLK and F_GETLK of fcntl() have also the similar statements.
 >
 >"Program rewriting map" (RewriteMap mapname prg:filename) of
 >the URL rewriting module (mod_rewrite) of the Apache HTTP server
 >uses file locking for pipe, so FreeBSD users cannot use the fine
 >feature of "program rewriting map".
 
    Hmmm. Maybe I'm missing something obvious, but I can't think of a reason
 why one would want to do file locking on a pipe (which is not a shared
 resource). This sounds like a bug in Apache to me...
 
 -DG
 
 David Greenman
 Core-team/Principal Architect, The FreeBSD Project