Hive Helsinki (School 42) 7th project (Rank02/06) of core curriculum.
About · Program · Requirements · Instructions
The repository contains files for creating two executables (./server and ./client) which can communicate with each other by utilising signals.
Launching the server executable presents a PID in the terminal which can be used as first argument for the client executable which in turn
needs to be launched in a second terminal window. The second argument for the ./client is the message which should be transferred to the server (if writing sentences, the whole arguement
needs to be put into quotes " "). Also emojis are supported.
The program makes use of several signal functions of the signal.h library, such as sigaction for setting up respective signal handlers.
Overall logic: First the client sends the length of the message which should be transferred to the server. The server allocates memory accordingly for the incoming message which is terminated by '/0'. As the project requirements only allow the usage of the two signals SIGUSER1 and SIGUSER2 for sending the information, the message is encoded from client with help of bitshifting into bits and then decoded again on server side.
gcccompiler
To compile the two executables, navigate into the repo folder and run:
$ make
Start the server and check the PID on the terminal.
$ ./server
Start the client by inserting the command below in a second terminal window (replace PID with the PID number displayed by the server and message with any text).
$ ./client <PID> <"message">
The sent message will appear in the terminal window of the server. The client terminal window in turn shows every bit transfer to the server for this message.