Re: Create NSStrings from a mapped NSData object - safe?
Re: Create NSStrings from a mapped NSData object - safe?
- Subject: Re: Create NSStrings from a mapped NSData object - safe?
- From: Michael Vannorsdel <email@hidden>
- Date: Tue, 13 May 2008 21:57:53 -0600
I actually tested this a month back and not all operations/programs
respect link counts nor does the system appear to enforce them. For
instance an rm -f will destroy the file regardless of link count, as
well as some obscure APIs. After the file was removed the mapping
program crashed when trying to read more of the file; it failed to
load new map data.
On May 13, 2008, at 9:08 AM, Jens Alfke wrote:
You're correct about modifications, but not about deletions. An open
file descriptor counts as a link to a file, so the unlink(2) system
call will not actually delete the file from disk because there's
still a link to it. Once you close the mapped file, the last link
goes away and then the file is actually deleted.
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