Creating an Empty Text File for Safe File Reading
When working with files, encountering non-existent files can lead to unexpected errors. To prevent this, you can create a function that checks for file existence and creates an empty file if necessary. Here's how:
First, let's define a function to check if a file exists:
func exists(path string) (bool, error) { _, err := os.Stat(path) if err == nil { return true, nil } if os.IsNotExist(err) { return false, nil } return true, err }
However, this approach suffers from a race condition. If the file is created concurrently, its check may return false, leading to incorrect behavior.
To overcome this issue, use os.OpenFile() with the O_CREATE flag instead of checking existence first:
func createEmptyFile(path string) (*os.File, error) { return os.OpenFile(path, os.O_RDONLY|os.O_CREATE, 0666) }
Now, when calling createEmptyFile(), the file will be created if it doesn't exist, ensuring safe file reading.
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