Hi. I'd like to know what is the purpose of the last (4th) argument of the proc file system operating functions like read and write ? The type of the argument is "loff_t *". When, how and why that (? offset ?) argument should be used and when it can be ignored ? ( i.e. what is the meaning of the argument ) Other things/arguments were obvious or I figured them out by "using the source" but I just didn't find out the correct way to use that argument... Thank U. |