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readFileSync Appears Un-synchronous or Fails on Raspberry Pi 3 #10621
Description
Activity
You can’t use
fs.readFileSyncwith callbacks, it just gives you the file contents as the return value. You’ll have to write something like this:ifs.eth0 = fs.readFileSync('/sys/class/net/eth0/address');
etc.
I’ll be closing this as it’s very likely not an issue with node core, but if you have any trouble getting this to work, please open an issue at https://github.com/nodejs/help :)
@addaleax I think Homer Simpson has a word for this... But thanks!
Reacted by Anna Henningsen
Situation:
I'm trying to capture my RPi3's mac addresses using synchronous file reading, getting information from my host system at `/sys/class/net/*/address`.Action:
I have two branches at this repo: https://github.com/noncreature0714/gen-sys-id-node.gitBranch master is the asynchronous version, and works successfully.
Branch sync-test is synchronous, and is not working as expected - almost as if it never ran synchronously.
Results:
Output of 'master' (asynchronous) branch is:Output of 'sync-test' branch is:
Summary
The values where never assigned, almost like what happens when asynchronous operations occur after accessing variables. Additionally, the `console.log()` inside the functions never logs. Which leads me to consider the possibility that `readFileSync` may not be working at all.