Hi! On 16:18 Fri 17 Dec , Hemanth Kumar wrote: > Hi All, > > In my driver code I have interrupt which is exactly 1 sec(gps-pps), > I want the data to be copied (copy_to_user) to the user space through read function,After the elapse of interrupt(1 sec gps-pps),how do I instantiate read function after elapse interrupt,Can anybody please share idea, > > Regards You cannot just call copy_to_user to dump your data somewhere to userspace. First you need to some some kind of kernel-userspace interface, e.g. a character device. The user space program could then open() it and do a read() to wait for some data. On the kernel side, you have to define and register a function, which gets called by the user space - in this case the counterpart of read(). If this function gets called, a buffer will be passed to you. You can then copy the data to this buffer with copy_to_user. But do *not* call this function in a interrupt handler or anywhere else. It *has* to be called inside your read() function or a function directly or indirectly called by it. If you receive the data only in your interrupt function, you may have to put the data in a queue which will then be read in your the read() function. -Michi -- programing a layer 3+4 network protocol for mesh networks see http://michaelblizek.twilightparadox.com -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ
