*oldlenp comes back with wrong value in helper sysctl_createv() function
Emile 'iMil' Heitor <[email protected]>
| Newsgroups | gmane.os.netbsd.devel.kernel |
|---|---|
| Message-ID | <[email protected]> |
I am creating a sysctl entry for TSLOG
https://man.freebsd.org/cgi/man.cgi?query=tslog&sektion=4&manpath=freebsd-release
In every example I see in our source tree, I read that when oldp is
NULL, *oldlenp should be set to desired size, return 0, and the
sysctl_createv() helper function will be again called with the right
*oldlenp value.
Except it does not, the first time it calls back the helper function,
*oldlenp value is 1024 no matter what I set it to before.
But if I return once again (either with ENOMEM or 0, doesn't matter),
the helper function will now be called with the right *oldlenp value.
I fail to see where this behavior comes from and I'd like to
understand the logic behind it.
--
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Emile `iMil' Heitor <imil@{home.imil.net,NetBSD.org}> | https://imil.net