Enum SpawnError 

pub enum SpawnError {
    NotStarted,
    NoPipe {
        stream: &'static str,
    },
}

Why a child could not be started.

Variants

NotStarted

The program could not be started.

Carries no io::Error, for the reason StdioError does: the caller in a position to tell “no such file” from “not executable” is the one that has already failed to spawn, and it can report the program’s own refusal. A String here would put a path this process invented onto the error path of every caller above it.

NoPipe

The child started, but the platform did not give it one of the three pipes.

Not a failure the spawn can detect — Stdio::piped() succeeding and the handle coming back without the stream is not a thing that happens — and reported because the alternative on the only path that can observe it is an unwrap, and an unwrap on a path that runs for every client a caller ever spawns is a panic waiting for a platform nobody tested.

Fields

stream: &'static str

Which of the three standard streams the platform withheld.

Trait Implementations

impl Clone for SpawnError

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for SpawnError

impl Debug for SpawnError

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Display for SpawnError

fn fmt(&self, __formatter: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Eq for SpawnError

impl Error for SpawnError

fn source(&self) -> Option<&(dyn Error + 'static)>

Returns the lower-level source of this error, if any.

fn description(&self) -> &str

👎Deprecated since 1.42.0:

use the Display impl or to_string()

fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting

fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (error_generic_member_access)

Provides type-based access to context intended for error reports.

impl From<SpawnError> for StdioConnectError

fn from(source: SpawnError) -> Self

Converts to this type from the input type.

impl PartialEq for SpawnError

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for SpawnError