Difference: SolutionsToTheExercises (2 vs. 3)

Line: 1 to 1

META TOPICPARENT	name="WebHome"

Solutions to the exercises

Line: 18 to 18

- if argv[1] is "write", make sure argc is exactly 4
- convert the pin number from string to integer. You may be tempted to use atoi() but you must not, because atoi() does not check for conversion errors. Use strtol() instead.
- Make sure the converted pin number is in the range 0..7
  For the "read" case we are done with our checks here

Changed:

<
<

- for the "write" case convert the logic level and make sure you get either 0 or 1

>
>

- for the "write" case convert the logic level and make sure you get either 0 or 1
Solutions to the exercises on files, pipes and sockets

These exercises have been skipped but I attach the solution codes nevertheless such that you can have a look at them and/or use them in a future course

Solutions to exercise 5: The DHT11 temperature and humidity sensor

The code contains an example of how to write a shared library. You can collect all libraries for your course in a common directory (.g. /opt/ucc/lib) as you do for all corresponding include files (/opt/ucc/include). Then you make the directory of libraries globally known to the system by putting a file ucc.conf into /etc/ld.so.conf. ucc.conf simply contains the text /opt/ucc/lib. Finally you run the command sudo ldconf and /opt/ucc/lib will be added to the search path of shared libraries on the system

Line: 28 to 31

META FILEATTACHMENT	attachment="solEx2.tar.gz" attr="" comment="" date="1507985585" name="solEx2.tar.gz" path="solEx2.tar.gz" size="818105" user="uli" version="1"
META FILEATTACHMENT	attachment="makeExamples.tar.gz" attr="" comment="" date="1507985978" name="makeExamples.tar.gz" path="makeExamples.tar.gz" size="1714" user="uli" version="1"

Added:

>
>

META FILEATTACHMENT	attachment="communication.tar.gz" attr="" comment="" date="1509006291" name="communication.tar.gz" path="communication.tar.gz" size="128" user="uli" version="1"