I'm developing a C program that needs to send data to a server, but I want it to run only when there's an active network connection. What's the best way to check for an internet connection on a Linux system?
3 Answers
You really need to clarify what you mean by "connected to the network." Are you checking if the network interface is up, if it has an IP address, or maybe if it can reach a gateway? You could also look for a specific remote IP or URL that's responsive. Without knowing what exactly you're defining as being connected, it's hard to give a precise solution.
If you just want to see if there's any internet connection, you can try using the ping command on Google.com.
A simple way to check if you're online is to ping a reliable server, like Google. If you get a response, you know you're connected to the internet.
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