KasperskyOS Community Edition 1.0

multi_vfs_ntpd example

This example shows how to use an external NTP server in KasperskyOS. The kl.Ntpd entity is included in KasperskyOS Community Edition and is an implementation of an NTP client, which gets time parameters from an external NTP servers in the background and passes them to the KasperskyOS kernel.

The example also demonstrates the use of various virtual file systems (VFS) in a single solution. The example uses different VFS to access the functions for working with the file system and functions for working with the network:

• VfsNet is used for working with the network.
• VfsRamfs and VfsSdCardFs are used for working with the file system.

The Client entity uses standard libc library functions for getting time information, which are converted to calls to VFS entities via IPC.

The Env entity is used to pass environment variables and main function arguments to other entities.

The CMake system, which is included with KasperskyOS Community Edition, is used to build and run the example.

Supplied resources

The following configuration files are included in the example:

• ./resources/include/config.h.in contains a description of the backend file system that will be used in the solution: sdcard or ramfs.

  Each backend in the solution also uses a separate VFS: respectively VfsSdCardFs or VfsRamfs.

• The ./resources/ramfs/etc and /resources/sdcard/etc directories contain configuration files for the VFS and Ntpd entities.

Example files

The code of the example and build scripts are available at the following path:

Building and running example

To run an example on QEMU, go to the directory containing the example, build the example and run the following commands:

See also Building and running examples section.