Dear all: I saw there is a callback function in file_operations, sendfile, and it seems user mode can pass file handle to kernel by this function. is there any document or example can tell me how to use this function? thanks for your kind help, miloody -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ