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listxattr.2: Add note on handling increases in sizes of keys or values 

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
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Michael Kerrisk 2015-02-11 12:11:10 +01:00
parent 9c321ba20b
commit a8215524ac
1 changed files with 12 additions and 0 deletions
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man2/listxattr.2
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@ -171,6 +171,18 @@ To keep the code simple, the program assumes that attribute keys and
values are constant during the execution of the program.
A production program should expect and handle changes during
execution of the program.
For example,
the number of bytes required for attribute keys
might increase between the two calls to
.BR listxattr ().
An application could handle this possibility using
a loop that retries the call
(perhaps up to a predetermined maximum number of attempts)
with a larger buffer each time it fails with the error
.BR ERANGE .
Calls to
.BR getxattr (2)
could be handled similarly.
The following output was recorded by first creating a file, setting
some extended file attributes,