Dear hackers,
I have a case, when I need to pass a small argument to kernel,
and receive large reply using getsockopt().
First I get the argument:
char var[MAX];
...
if ((error = sooptcopyin(sopt, var, MAX, 2))
...
Then I push reply to it using sooptcopyout(). But userland receives it
truncated to MAX. The problem lives in sooptcopyin() implementation,
which changes sopt->sopt_valsize.
Now, in my patch I solve this using bare copyin(). Another approach
may be saving sopt->sopt_valsize before call to sooptcopyin(), and then
restoring it. Not a nice solution however...
The questions are:
1) Is it OK to use bare copyin()? Which hidden problems can arise?
2) Is that correct that soopcopy[in|out]() changes sopt's fields?
--
Totus tuus, Glebius.
GLEBIUS-RIPN GLEB-RIPE
_______________________________________________
[EMAIL PROTECTED] mailing list
http://lists.freebsd.org/mailman/listinfo/freebsd-hackers
To unsubscribe, send any mail to "[EMAIL PROTECTED]"
