SO_TIMESTAPMNS option in NetBSD

I've made a small patch that implements SO_TIMESTAMPNS option in NetBSD kernel. Userlevel program that can test it is here.
One nasty thing i faced is that i used older header files for userspace program, and struct timespec was changed since.

struct timespec
{
    time_t tv_sec; //Now 64 bits long (was 32)
    long tv_nsec;
};

I have been getting zero tv_nsec all the time because of that. 

For real the receieved structre is:
+---------------------------+
| tv_sec  | [lower 4 bytes] |
| tv_sec  | [upper 4 bytes] |
| tv_nsec | [4 bytes]       |
+---------------------------+

Userspace thinks:
+---------------------------+
| tv_sec  | [lower 4 bytes] |
| tv_nsec | [4 bytes]       |
+---------------------------+

Had a hard time debugging that ;)

Base64 and Pipes

Today I needed to copy an rpm file to Xen virtual machine having xm console as the only access to VM (xm console opens console to virtualized OS).

The first idea that comes is to open editor in the VM and copy-paste the contents of rpm there. 

Unfortunatelly it's not going to work because virtual console will interpret non-ASCII symbols of binary file stream as escape codes which makes copying in this way impossible.

The UNIX utility which can help us is base64. It converts binary file to text representation which can be copied safely.

The whole process can be simplified to following:

from host side:
base64 file.rpm | xm console vm

from VM side:
base64 -d < /dev/tty > file.rpm

Where
"< /dev/tty" - standart input (from console),
"> file.rpm" - standart output (to file)