Date: Thu, 2 Jun 2005 22:20:55 -0700 From: John-Mark Gurney <gurney_j@resnet.uoregon.edu> To: shiner chen <shiner_chen@yahoo.com.cn> Cc: freebsd-hackers@freebsd.org Subject: Re: a error about the kern_sendit Message-ID: <20050603052054.GE594@funkthat.com> In-Reply-To: <20050603034129.34801.qmail@web15510.mail.cnb.yahoo.com> References: <20050603034129.34801.qmail@web15510.mail.cnb.yahoo.com>
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shiner chen wrote this message on Fri, Jun 03, 2005 at 11:41 +0800:
> i wrote a function to send the data of my a data structure in my kld by socket in kernel, the function as follow:
> the arg 1 is file descriptor of socket. the arg 2 is the address of data structure. the arg 3 is the length of data structure and it is 20 bytes .
>
> the error return by kern_sendit is EFAULT(14), i check the address of data structure ,but it is right!
> why ? who can tell me. thanks!!
This buffer is in SYSSPACE:
> /* do actual send operation now */
> aiov.iov_base = snd_buf ;
> aiov.iov_len = uBufLen;
> ///////// there is error////////////////////////
> /*st = kern_sendit(td, so_fd,&msg,0,0);*/
^ but you say it's in userspace..
Look at uio.h for the enum uio_seg definition... and uio(9) is also
useful... Try replacing that last zero with UIO_SYSSPACE..
> st = keta_kern_sendit(td, control_so,&msg,0,0);
and possibly here...
--
John-Mark Gurney Voice: +1 415 225 5579
"All that I will do, has been done, All that I have, has not."
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