>   off_t lseek(int fd, off_t offset, int whence);
>   ssize_t write(int fd, const void *buf, size_t count);
>   ssize_t pwrite(int fd, const void *buf, size_t count, off_t offset) {
>       lseek(fd, offset, SEEK_SET);
>       return write(fd, buf, count);
>   }

>    I may be wrong here. What I actually remember is that, in the 
>parameters received by the driver, there is an offset were to write to 
>or read from. Therefore the current location is managed at a higher 
>level, which may well be in the VFS and not in the libc. Sorry for 
>that inacuracy.