Hi Mulyadi and John, On 4 October 2010 23:03, John Mahoney <[email protected]> wrote: >> >> Most of the times, network related devices aren't represented as file >> inside /dev. This is...well, you might think,against common sense that >> "everything is file" under Linux.
@Mulyadi: Yes, that's right. I saw the source code of uml_utils, and it has code to create a tun/tap device and obtain a file descriptor to it, but not open an existing tun/tap device that has been created using tunctl. The example was also there in Documentation/networking/tuntap.txt. > > tun/tap are the exception to the exception to the rule. In other works > network drives normally do not appear in /dev/ or as a file, but tun/tap do > at least in my using them over the past 4 years. OpenVpn is a high profile > known user of tun/tap, you may want to check there as a start. Are you sure > you have the tun/tap driver loaded. @John: I expected that, but currently, the only way for a program to create a tun/tap device is to use an ioctl call which returns a file descriptor that can be used to read/write on the device. I was wondering how to open an already existing tap device.. Thanks all. -- Vimal -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to [email protected] Please read the FAQ at http://kernelnewbies.org/FAQ
