From owner-freebsd-hackers  Tue Mar 12 13:49: 0 2002
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Date: Tue, 12 Mar 2002 13:48:51 -0800
From: Alfred Perlstein <bright@mu.org>
To: Farooq Mela <fmela0@sm.socccd.cc.ca.us>
Cc: freebsd-hackers@freebsd.org
Subject: Re: Recv() to a mmap'ed file?
Message-ID: <20020312214851.GK92565@elvis.mu.org>
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* Farooq Mela <fmela0@sm.socccd.cc.ca.us> [020312 13:01] wrote:
> 
> Rather than the usual recv() to a fixed size buffer, write() to the
> file descriptor, loop, etc.  However when I try to do this recv gives
> me back an EFAULT (bad address).  Is there a limitation of the
> architecture which does not allows us to recv() to an mmap'ed area of
> a file, or is it just something which hasn't been implemented?

You may not extend a file using mmap(2), you must use ftuncate(2)
or write(2).

-Alfred

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