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Better documentation for io::Read::read() return value #72031

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May 9, 2020
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Better documentation for io::Read::read() return value #72031

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5 changes: 5 additions & 0 deletions src/libstd/io/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -517,6 +517,11 @@ pub trait Read {
/// reader will *always* no longer be able to produce bytes.
/// 2. The buffer specified was 0 bytes in length.
///
/// It is not an error if the returned value `n` is smaller than the buffer size,
/// even when the reader is not at the end of the stream yet.
/// This may happen for example because fewer bytes are actually available right now
/// (e. g. being close to end-of-file) or because read() was interrupted by a signal.
///
/// No guarantees are provided about the contents of `buf` when this
/// function is called, implementations cannot rely on any property of the
/// contents of `buf` being true. It is recommended that *implementations*
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