Thanks, Graham.
On Mar 8, 2011, at 12:39 AM, Graham Cox wrote:
You could just make it bigger - it's a very transient piece of
memory on the stack (or, if that's a problem, just malloc and free a
chunk). Since getxattr allows you to pass in the max size of the
buffer, it's also safe from a buffer overflow attack.
Another solution was suggested offline:
On Mar 7, 2011, at 10:14 PM, Scott Ribe wrote:
From the xattr man page:
When value is set to NULL, getxattr() returns current size of the
named attribute. This facility can be used to determine the size of
a buffer sufficiently large to hold the data currently associated
with the attribute.
--
Scott Ribe
scott_r...@elevated-dev.com
http://www.elevated-dev.com/
(303) 722-0567 voice
My response:
Thanks, Scott. Obviously I should RTFM 8-)
I coded it to get the attribute size as you've described, allocate a
large enough buffer, and call getxattr() again for the data. It
works great!
I found, though, that strangely I don't have any documentation of
the getxattr() behaviour you've described.
1) I was using the book "Advanced Mac OS X Programming", by
Dalrymple and Hillegass. It has a section on xattributes, but
doesn't mention
the ability to set value to NULL in getxattr().
2) I tried to get the xattr man page, but typing 'man xattr' and
'man getxattr()' into the terminal didn't return anything.
a) I thought man pages were only for commands. Can we get man
pages for C functions too?
b) I'm still on OS X 10.5. Maybe that's why I don't get anything?
------------------------------------------------
In further discussion with Scott, it looks like the xattribute docs
aren't in the 10.5 man pages
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