From owner-freebsd-hackers  Sat Aug 21 19:48:32 1999
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Date: Sat, 21 Aug 1999 19:47:03 -0700 (PDT)
From: Matthew Dillon <dillon@apollo.backplane.com>
Message-Id: <199908220247.TAA75778@apollo.backplane.com>
To: Wes Peters <wes@softweyr.com>
Cc: Don Lewis <Don.Lewis@tsc.tdk.com>, hackers@FreeBSD.ORG
Subject: Re: mmap mapped segment length
References: <199908210906.CAA17706@salsa.gv.tsc.tdk.com> <37BF4C99.67814B7@softweyr.com>
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:Now I've got to go figure out what *I've* screwed up.  I fstat the file before
:mapping it and pass S.st_size as the map length.  Is there any reason why
:mmap would return non-NULL but map less than the requested size?
:
:Scratching my head,

    Note that mmap() returns (void *)-1 when an error occurs, *not* NULL.

    This is because it is legal to mmap at address 0.

					-Matt
					Matthew Dillon 
					<dillon@backplane.com>


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