EC
ErrorKind::InvalidInput
RustERRORCommonI/O

Invalid input parameter

Quick Answer

Validate all parameters before passing to I/O functions.

What this means

A parameter passed to an I/O function was invalid (e.g. a zero-length read, invalid socket option).

Why it happens
  1. 1Passing a zero-length buffer to write
  2. 2Negative timeout value
  3. 3Invalid socket option level

Fix

Validate buffer length

Validate buffer length
fn write_checked(w: &mut impl std::io::Write, buf: &[u8]) -> std::io::Result<()> {
    if buf.is_empty() { return Ok(()); }
    w.write_all(buf)
}

Why this works

Skips the write call entirely when the buffer is empty, avoiding InvalidInput.

Code examples
Triggerrust
socket.set_read_timeout(Some(std::time::Duration::ZERO))?; // InvalidInput
Same error in other languages
EINVALin Linux / POSIX→
Sources

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