On Wed, Feb 25, 2009 at 8:20 AM, Pei Lin <[email protected]> wrote:
> "sys_clock_gettime " is System call which is provided to usr space as > a interface for kernel.As you write a module you should use function > in kernel system map that is export to use for your drive. > > if you want get time in your module,you can check recent > include/linux/time.h like current_kernel_time() > or > CURRENT_TIME() > do_gettimeofday etc. > > Maybe this can give u some help. > Yes, generally its 'do_gettimeofday' so use this in your kernel module. > > Lin > > 2009/2/25 Ole Loots <[email protected]>: > > But I wan't to call a function that is not part of my module... i want to > > call sys_clock_gettime - which is a function of the kernel. > > > > > > ----- Original Message ----- From: "Guo Hongruan" <[email protected]> > > To: "Ole Loots" <[email protected]> > > Sent: Wednesday, February 25, 2009 12:47 PM > > Subject: Re: Getting kernel symbols in kernel module (dynamically) > > > > > >> If you want to call a symbol in kernel module, you need to make sure it > is > >> exported. Through the macro EXPORT_SYMBOL, you can export the kernel > >> function or variables, so that you can call them in kernel module. > >> > >> The following is an example: > >> > >> EXPORT_SYMBOL(acpi_bus_get_device); > >> > >> 在 Wed, 25 Feb 2009 18:45:05 +0800，Ole Loots <[email protected]> 写道: > >> > >>> > >>> Hello Guo, > >>> > >>> I'm talking about kernel space. I want to get kernel space symbols when > >>> running a kernel module... Or maybe the linker can link agains the > kernel > >>> (so the addresses of the symbols are statically inserted into my > module, > >>> also), but that wouldn't be as good as getting the symbols dynamically. > >>> > >>> On Wed, 25 Feb 2009 18:20:21 +0800, "Guo Hongruan" <[email protected] > > > >>> wrote: > >>>> > >>>> Too dangrous!! > >>>> > >>>> In kernel space or userspace? If in userspace, you can only call > >>>> clock_gettime. > >>>> > >>>> 在 Wed, 25 Feb 2009 18:08:55 +0800，Ole Loots <[email protected]> > >>> > >>> 写道: > >>>> > >>>>> Hello, > >>>>> > >>>>> I want to call the kernel function sys_clock_gettime, but when I just > >>>>> try to call it, the linker complains about the unknown > symbol/function > >>>>> sys_clock_gettime, so i have hard coded a function pointer in my > >>>>> module...: > >>>>> > >>>>> long (*p_sys_clock_gettime)(clockid_t, struct timespec *tp) = > >>> > >>> 0xc004373c; > >>>>> > >>>>> That works fine for my system, but I know thats not the way to do it. > >>>>> How is it done properly? > >>>>> > >>>>> Regards, > >>>>> Ole > >>>>> > >>>>> > >>>>> -- > >>>>> To unsubscribe from this list: send an email with > >>>>> "unsubscribe kernelnewbies" to [email protected] > >>>>> Please read the FAQ at http://kernelnewbies.org/FAQ > >>>>> > >> > >> > >> > >> -- > >> Guo Hongruan, Embedded Linux Consultant > >> Mobile: +86-0-13484056007 > >> Skype: camelguo > >> http://www.gulessoft.com > >> > > > > > > -- > > To unsubscribe from this list: send an email with > > "unsubscribe kernelnewbies" to [email protected] > > Please read the FAQ at http://kernelnewbies.org/FAQ > > > > > > -- > To unsubscribe from this list: send an email with > "unsubscribe kernelnewbies" to [email protected] > Please read the FAQ at http://kernelnewbies.org/FAQ > > -- Thanks Rizavan
