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From: kernelnewbies-bounces+jharan=bytemobile.com@xxxxxxxxxxxxxxxxx [mailto:kernelnewbies-bounces+jharan=bytemobile.com@xxxxxxxxxxxxxxxxx]
On Behalf Of Lucas Tanure (Forget the last e-mail, please, stupid Gmail) Hi, I'm looking for some information about : struct kobj_attribute { My function to handle the operation: static ssize_t my_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count) { char *buffer; buffer = (char*) kcalloc(count, sizeof(char), GFP_KERNEL); copy_from_user(buffer, buf, count); ..... ..... etc.... } So, this const char *buf, where ti come from ? Kernel space? My copy_from_user it's not working. Should return zero. There any Macro or function to test if the pointer buf
is a kernel pointer ? Thanks Lucas Tanure I haven’t written too many of these things, but the last time I wrote a store function I didn’t need to do the copy_to_user(). buf seemed to point to directly accessible kernel memory. I would think a simple memcpy above would do the trick. Jeff |
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