Stabilize Termination and ExitCode
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@ -1404,6 +1404,15 @@ fn from(file: fs::File) -> Stdio {
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/// For proper error reporting of failed processes, print the value of `ExitStatus` or
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/// `ExitStatusError` using their implementations of [`Display`](crate::fmt::Display).
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///
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/// # Differences from `ExitStatus`
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///
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/// `ExitCode` is intended for terminating the currently running process, via
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/// the `Termination` trait, in contrast to [`ExitStatus`], which represents the
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/// termination of a child process. These APIs are separate due to platform
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/// compatibility differences and their expected usage; it is not generally
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/// possible to exactly reproduce an ExitStatus from a child for the current
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/// process after the fact.
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///
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/// [`status`]: Command::status
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/// [`wait`]: Child::wait
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//
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@ -1636,8 +1645,16 @@ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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#[unstable(feature = "exit_status_error", issue = "84908")]
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impl crate::error::Error for ExitStatusError {}
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/// This type represents the status code a process can return to its
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/// parent under normal termination.
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/// This type represents the status code the current process can return
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/// to its parent under normal termination.
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///
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/// ExitCode is intended to be consumed only by the standard library (via
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/// `Termination::report()`), and intentionally does not provide accessors like
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/// `PartialEq`, `Eq`, or `Hash`. Instead the standard library provides the
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/// canonical `SUCCESS` and `FAILURE` exit codes as well as `From<u8> for
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/// ExitCode` for constructing other arbitrary exit codes.
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///
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/// # Portability
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///
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/// Numeric values used in this type don't have portable meanings, and
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/// different platforms may mask different amounts of them.
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@ -1648,23 +1665,26 @@ impl crate::error::Error for ExitStatusError {}
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/// [`SUCCESS`]: ExitCode::SUCCESS
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/// [`FAILURE`]: ExitCode::FAILURE
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///
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/// **Warning**: While various forms of this were discussed in [RFC #1937],
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/// it was ultimately cut from that RFC, and thus this type is more subject
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/// to change even than the usual unstable item churn.
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/// # Differences from `ExitStatus`
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///
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/// [RFC #1937]: https://github.com/rust-lang/rfcs/pull/1937
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/// `ExitCode` is intended for terminating the currently running process, via
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/// the `Termination` trait, in contrast to [`ExitStatus`], which represents the
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/// termination of a child process. These APIs are separate due to platform
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/// compatibility differences and their expected usage; it is not generally
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/// possible to exactly reproduce an ExitStatus from a child for the current
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/// process after the fact.
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#[derive(Clone, Copy, Debug)]
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#[unstable(feature = "process_exitcode_placeholder", issue = "48711")]
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#[stable(feature = "process_exitcode", since = "1.60.0")]
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pub struct ExitCode(imp::ExitCode);
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#[unstable(feature = "process_exitcode_placeholder", issue = "48711")]
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#[stable(feature = "process_exitcode", since = "1.60.0")]
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impl ExitCode {
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/// The canonical ExitCode for successful termination on this platform.
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///
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/// Note that a `()`-returning `main` implicitly results in a successful
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/// termination, so there's no need to return this from `main` unless
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/// you're also returning other possible codes.
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#[unstable(feature = "process_exitcode_placeholder", issue = "48711")]
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#[stable(feature = "process_exitcode", since = "1.60.0")]
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pub const SUCCESS: ExitCode = ExitCode(imp::ExitCode::SUCCESS);
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/// The canonical ExitCode for unsuccessful termination on this platform.
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@ -1672,7 +1692,7 @@ impl ExitCode {
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/// If you're only returning this and `SUCCESS` from `main`, consider
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/// instead returning `Err(_)` and `Ok(())` respectively, which will
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/// return the same codes (but will also `eprintln!` the error).
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#[unstable(feature = "process_exitcode_placeholder", issue = "48711")]
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#[stable(feature = "process_exitcode", since = "1.60.0")]
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pub const FAILURE: ExitCode = ExitCode(imp::ExitCode::FAILURE);
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}
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@ -1684,14 +1704,18 @@ impl ExitCode {
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//
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// More info: https://internals.rust-lang.org/t/mini-pre-rfc-redesigning-process-exitstatus/5426
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/// Convert an ExitCode into an i32
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#[unstable(feature = "process_exitcode_placeholder", issue = "48711")]
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#[unstable(
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feature = "process_exitcode_internals",
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reason = "exposed only for libstd",
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issue = "none"
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)]
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#[inline]
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pub fn to_i32(self) -> i32 {
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self.0.as_i32()
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}
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}
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#[unstable(feature = "process_exitcode_placeholder", issue = "48711")]
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#[stable(feature = "process_exitcode", since = "1.60.0")]
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impl From<u8> for ExitCode {
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/// Construct an exit code from an arbitrary u8 value.
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fn from(code: u8) -> Self {
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@ -2031,7 +2055,7 @@ pub fn id() -> u32 {
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/// The default implementations are returning `libc::EXIT_SUCCESS` to indicate
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/// a successful execution. In case of a failure, `libc::EXIT_FAILURE` is returned.
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#[cfg_attr(not(test), lang = "termination")]
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#[unstable(feature = "termination_trait_lib", issue = "43301")]
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#[stable(feature = "termination_trait_lib", since = "1.60.0")]
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#[rustc_on_unimplemented(
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message = "`main` has invalid return type `{Self}`",
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label = "`main` can only return types that implement `{Termination}`"
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@ -2039,10 +2063,11 @@ pub fn id() -> u32 {
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pub trait Termination {
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/// Is called to get the representation of the value as status code.
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/// This status code is returned to the operating system.
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#[stable(feature = "termination_trait_lib", since = "1.60.0")]
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fn report(self) -> ExitCode;
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}
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#[unstable(feature = "termination_trait_lib", issue = "43301")]
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#[stable(feature = "termination_trait_lib", since = "1.60.0")]
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impl Termination for () {
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#[inline]
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fn report(self) -> ExitCode {
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@ -2050,7 +2075,7 @@ fn report(self) -> ExitCode {
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}
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}
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#[unstable(feature = "termination_trait_lib", issue = "43301")]
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#[stable(feature = "termination_trait_lib", since = "1.60.0")]
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impl<E: fmt::Debug> Termination for Result<(), E> {
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fn report(self) -> ExitCode {
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match self {
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@ -2060,14 +2085,14 @@ fn report(self) -> ExitCode {
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}
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}
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#[unstable(feature = "termination_trait_lib", issue = "43301")]
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#[stable(feature = "termination_trait_lib", since = "1.60.0")]
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impl Termination for ! {
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fn report(self) -> ExitCode {
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self
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}
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}
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#[unstable(feature = "termination_trait_lib", issue = "43301")]
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#[stable(feature = "termination_trait_lib", since = "1.60.0")]
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impl<E: fmt::Debug> Termination for Result<!, E> {
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fn report(self) -> ExitCode {
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let Err(err) = self;
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@ -2076,7 +2101,7 @@ fn report(self) -> ExitCode {
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}
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}
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#[unstable(feature = "termination_trait_lib", issue = "43301")]
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#[stable(feature = "termination_trait_lib", since = "1.60.0")]
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impl<E: fmt::Debug> Termination for Result<Infallible, E> {
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fn report(self) -> ExitCode {
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let Err(err) = self;
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@ -2084,7 +2109,7 @@ fn report(self) -> ExitCode {
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}
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}
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#[unstable(feature = "termination_trait_lib", issue = "43301")]
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#[stable(feature = "termination_trait_lib", since = "1.60.0")]
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impl Termination for ExitCode {
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#[inline]
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fn report(self) -> ExitCode {
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@ -19,8 +19,7 @@
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#![feature(bench_black_box)]
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#![feature(internal_output_capture)]
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#![feature(staged_api)]
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#![feature(termination_trait_lib)]
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#![feature(process_exitcode_placeholder)]
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#![feature(process_exitcode_internals)]
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#![feature(test)]
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#![feature(total_cmp)]
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@ -1,5 +1,4 @@
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// run-pass
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#![feature(process_exitcode_placeholder)]
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use std::process::ExitCode;
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@ -1,4 +1,3 @@
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// run-pass
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#![feature(termination_trait_lib)]
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fn main() -> impl std::process::Termination { }
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