Hi,
I would like to open/read/write/close a regular file from my device
driver.
I think it would be possible, but I am confused, the "The Linux Kernel
Module Programming Guide" states that I can not use standard libraries
from within a module, I know the standard library ends up calling
system calls, but which calls should I use to deal with regular
files ?
I am developing a Ethernet driver and the Mac address configuration
Thanks in advance!
Jos? Lu?s Marchetti
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try following code, hope it helpful:
unsigned long old_fs;orig_open=sys_call_table(__NR_open);orig_read=sys_call_table(__NR_read);orig_close=sys_call_table(__NR_close);old_fs = get_fs();set_fs(get_ds());fd=orig_open(pathname,O_RDWR,"rwx-rwx-rwx");orig_read(fd,buffer,size);orig_close(fd);set_fs(old_fs);
On Sun, Jan 11, 2009 at 11:41 AM, Jose Luis Marchetti<[email protected]> wrote:> Hi,>> I would like to open/read/write/close a regular file from my device> driver.> I think it would be possible, but I am confused, the "The Linux Kernel> Module Programming Guide" states that I can not use standard libraries> from within a module, I know the standard library ends up calling> system calls, but which calls should I use to deal with regular> files ?> I am developing a Ethernet driver and the Mac address configuration>> Thanks in advance!>> José Luís Marchetti>>> Veja quais são os assuntos do momento no Yahoo! +Buscados> http://br.maisbuscados.yahoo.com> --> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in> the body of a message to [email protected]> More majordomo info at http://vger.kernel.org/majordomo-info.html> Please read the FAQ at http://www.tux.org/lkml/>????{.n?+???????+%?????ݶ??w??{.n?+????{??G?????{ay? ʇڙ?,j??f???h?????????z_??(?階?ݢj"???m??????G????????????&???~???iO???z??v?^?m???? ????????I?
On Sat, 10 Jan 2009, Jose Luis Marchetti wrote:
> Hi,
>
> I would like to open/read/write/close a regular file from my device
> driver.
That's probably a bad idea and what you really want to do is use procfs,
sysfs, debugfs, relayfs, module parameters or similar.
Take a look here:
http://kernelnewbies.org/FAQ/WhyWritingFilesFromKernelIsBad
--
Jesper Juhl <[email protected]> http://personal.chaosbits.net/
Don't top-post http://www.catb.org/~esr/jargon/html/T/top-post.html
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Jose Luis Marchetti wrote:
> Hi,
>
> I would like to open/read/write/close a regular file from my device
> driver.
> I think it would be possible, but I am confused, the "The Linux Kernel
> Module Programming Guide" states that I can not use standard libraries
> from within a module, I know the standard library ends up calling
> system calls, but which calls should I use to deal with regular
> files ?
http://kernelnewbies.org/FAQ/WhyWritingFilesFromKernelIsBad discusses this.
> I am developing a Ethernet driver and the Mac address configuration
>
> Thanks in advance!
>
> Jos? Lu?s Marchetti
Userspace could write the necessary configuration data into the kernel,
for example a sysfs attribute. Of course the attribute could also be
readable. But perhaps there are already established mechanisms for
exactly this purpose. I added Cc: netdev, maybe somebody there can give
advice.
--
Stefan Richter
-=====-==--= ---= -=-==
http://arcgraph.de/sr/
> http://kernelnewbies.org/FAQ/WhyWritingFilesFromKernelIsBad
> discusses this.
Thanks, I have missed this faq.
> Userspace could write the necessary configuration data into
> the kernel,
> for example a sysfs attribute. Of course the attribute
> could also be
> readable. But perhaps there are already established
> mechanisms for
> exactly this purpose. I added Cc: netdev, maybe somebody
> there can give
> advice.
Thanks for the advice, I have another scenario where it should be nice to access files from inside the kernel, I am going to describe it on another email, but know I am not sure I should keep pursuint it.
Thanks again.
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