[usrbinbash]

> you didn’t handle the possible error condition, you just silently ignored it.

Problem is, the error condition is not even that obvious. I tried it, and printf() will happily return the number of bytes written, even when redirecting stdout to /dev/full.

I am not 100% sure, but I think this has to do with the fact that printf uses buffered io, and writing the bytes to the buffer will work. It's only when the buffer is flushed that this will become a problem, but this would need to be handled in the code to show an error message.