Engineering and technology

#include – Arduino Reference

Jovan Stosic May 8, 2021

#include is used to include outside libraries in your sketch. This gives the programmer access to a large group of standard C libraries (groups of pre-made functions), and also libraries written especially for Arduino.

The main reference page for AVR C libraries (AVR is a reference to the Atmel chips on which the Arduino is based) is here.

Note that #include, similar to #define, has no semicolon terminator, and the compiler will yield cryptic error messages if you add one.

Syntax

#include <LibraryFile.h>
#include "LocalFile.h"

https://www.arduino.cc/reference/en/language/structure/further-syntax/include/

Shutdown is so slow in16.04 – Ask Ubuntu

Jovan Stosic May 4, 2021

ccpd = Canon Printer Daemon for CUPS

On a system with Linux MINT 18 (based on Ubuntu 16.4 LTS) and a Canon LBP7210C network printer, I did this for a faster timeout to take precedence.

Edit the override.conf file

$ sudo systemctl edit ccpd.service

and enter

[Service]
TimeoutStopSec=10

to set the timeout to 10 seconds. Save and exit.
This change will prevail between each shutdown.

To check the modified timeout value, run

$ systemctl show ccpd.service -p TimeoutStopUSec
TimeoutStopUSec=10s

The same method was used in this post https://askubuntu.com/a/810237 for a different service.

Note: Each service has a timeout and its there for a reason. Changing the timeout for a network printer seems OK. For other services (eg: disk drives) the effect of changing a preset value must be carefully considered.

 

Source: Shutdown is so slow in16.04 – Ask Ubuntu