Example socket
This is a guide to the socket C example project included in the EMAC OE SDK.
This application demonstrates how to set up host and client node sockets on an ethernet network.
The socket project builds one executable: socket.
Contents
Opening, Building and Uploading the Project Files
1. Open the C/C++ editing perspective.
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2. Open the project files.
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3. Build the project.
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4. Upload the executables to the target system.
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Usage and Behavior
Hardware Requirements
The socket C example project will run just fine on any system for which it can be compiled.
Using socket
Get 2 machines. We're going to refer to our machines as MACHINE0 and MACHINE1.
Compile and upload the socket executable to each of them.
Connect them both to the same ethernet network.
On MACHINE0 run the socket program like this:
som9g45:/tmp# ./socket -s 9999
Note that we specified -s, thus configuring MACHINE0 as a server. 9999 is an arbitrarily chosen (and assumed to be free) port address on the host machine.
...MACHINE0 has been configured as a server and now it's waiting for a connection...
On MACHINE1 run the socket program like this:
som9g20:/tmp# ./socket -c 10.0.2.204 9999
Note that we specified -c, thus configuring MACHINE1 as a client. 10.0.2.204 is the host machine's address. 9999 is that port address on the host machine.
On MACHINE0 you will see something like this:
som9g45:/tmp# ./socket -s 9999
Starting server
Making socket
Binding to port 9999opened socket as fd (3) on port (9999) for stream i/o
Server
sin_family = 2
sin_addr.s_addr = 0
sin_port = 9999
Making a listen queue of 5 elements
Waiting for a connection
Got a connection
Sending "Message from the socket server" to client
The messages match
Closing the socket
Waiting for a connection
On MACHINE1 you will see something like this:
root@som9g20:/tmp# ./socket -c 10.0.2.204 9999
Making a socket
Connecting to 10.0.2.204 on port 9999
Received "Message from the socket server" from server
Writing "Message from the socket server" to server
Closing socket
This is what happened: MACHINE0 (the server) was set as a server and waited for a connection. MACHINE1 (the client) connected to MACHINE0. MACHINE0 sent a message to MACHINE1: "Message from the socket server". MACHINE1 received the message and sent it right back again to check the accuracy of the transmission. The messages match so the transmission was successful.
Summary
The socket C example project demonstrates how to set up host and client node sockets on an ethernet network.
