Is there any way to map kernel space (which is allocated in the driver)
to user space, or vice versa, so that both driver and the application
can simultaneously access to the same buffer ?
Kevin
by Kevin Sha » Wed, 08 Mar 2000 04:00:00
Kevin
by Fabrice Pei » Wed, 08 Mar 2000 04:00:00
> Is there any way to map kernel space (which is allocated in the driver)
> to user space, or vice versa, so that both driver and the application
> can simultaneously access to the same buffer ?
> Kevin
by Grant Edwar » Wed, 08 Mar 2000 04:00:00
Here's an example device driver that allows the user to mmap()
two blocks of PCI device memory and one page of buffer space
(it impliments three different minor devices):
ftp://ftp.visi.com/users/grante/stuff/demomm.tar.gz
--
Grant Edwards grante Yow! One FISHWICH coming
at up!!
visi.com
by Fabrice Pei » Thu, 09 Mar 2000 04:00:00
> > Is there any way to map kernel space (which is allocated in the driver)
> > to user space, or vice versa, so that both driver and the application
> > can simultaneously access to the same buffer ?
> > Kevin
> For kernel 2.2.x I think is not possible for 2.3.x i think the same
> thing but i am not sure...
1. Need help in understanding the mapping of user-space send, sendto, sendmsg to kernel-space sendmsg
Hello,
I am trying to implement my own transport layer protocol in Linux for
an experiment. I am going to use socket interface and add my protocol
using sock_register. For the proto_ops i can see that the parameters
for the sendmsg and recvmsg are (struct kiocb *iocb, struct socket
*sock, struct msghdr *msg, size_t len, int flags). But there are three
types of user api's send, sendto, sendmsg. Of these three only sendmsg
contains a parameter for msghdr. I find that the other two api's are
incompatible with the parameters supplied by the kernel to my kernel-
space sendmsg function. So what happens when we use send and sendto
user-space api's? Hope i am clear..
Thanks,
Bala
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