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It’s simple to generate a write error in a test suite by writing to /dev/full. Is there a good technique to generate a read error? I’m currently using LD_PRELOAD to override read but that seems too complicated and non-portable (not that /dev/full is portable…).
Besides reading from a directory (as mentioned in a previous answer) you can try to read
/proc/self/memto get an error (this should get you anEIOon Linux). For an explanation, please see: https://unix.stackexchange.com/a/6302