Function std::io::copy
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[src]
pub fn copy<R: Read, W: Write>(r: &mut R, w: &mut W) -> Result<u64>
Copies the entire contents of a reader into a writer.
This function will continuously read data from r`rand then write it into` and then write it into
w`win a streaming fashion until` in a streaming fashion until r`r` returns EOF.
On success the total number of bytes that were copied from r`rto` to w`w` is
returned.
Errors
This function will return an error immediately if any call to read`reador` or
write`writereturns an error. All instances of` returns an error. All instances of ErrorKind::Interrupted`ErrorKind::Interrupted` are
handled by this function and the underlying operation is retried.