.. _posix-gettimeofday-sample:
POSIX gettimeofday() with clock initialization over SNTP
########################################################
Overview
********
This sample application demonstrates using the POSIX gettimeofday()
function to display the absolute wall clock time every second. At
system startup, the current time is queried using the SNTP networking
protocol, enabled by setting the :option:`CONFIG_NET_CONFIG_CLOCK_SNTP_INIT`
and :option:`CONFIG_NET_CONFIG_SNTP_INIT_SERVER` options.
Building and Running
********************
This project outputs to the console. It can be built and executed
on QEMU as follows:
.. zephyr-app-commands::
:zephyr-app: samples/posix/gettimeofday
:host-os: unix
:board: qemu_x86
:goals: run
:compact:
For comparison, a version for native POSIX operating systems (e.g. Linux)
can be built using:
.. code-block:: console
make -f Makefile.posix
4e116873f5