The read function pointer of the sysfs bin_attribute structure has this
signature:
ssize_t (*read)(struct kobject *kobj, struct bin_attribute *attr,
char *buf, loff_t offset, size_t size);
I've figured out the purpose of all the parameters except the loff_t
parameter.
Obviously it's an offset of some sort, but what is the meaning of the offset?
If I have binary data in a char* named bindata of size bsize, should it be
copied into buf+offset in something like:
memcpy(buf+offset, bindata, bsize);
Or, is it an offset from both buf and bindata in something like:
memcpy(buf+offset, bindata+offset, bsize-offset);
Thanks,
Rick
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