Error-handling Questions

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Example of strerror_r

I'm a newbie in error handling; in my code i need to test the returned value of a function and to print the error's description if an error

Node.JS service layer design

I have a very simple express js server that accepts a request from a client, performs some business logic and respond back to the client. the
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State is not defined

I'm new to react and i'm getting an error for the state and method: ./src/app.js line 5: 'state' is not defined
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Not getting firebase access token

Firebase messaging error in http server, but works well in https server. ; firebaseerror: messaging: the required permissions were not
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