refactor(symfony-process): extract symfony/process into the shirabe-symfony-process crate

Move `Symfony\Component\Process` out of shirabe-external-packages and
into its own crate, so the path is `shirabe_symfony_process::Process`
instead of `shirabe_external_packages::symfony::process::Process`.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

1 files changed, 1293 insertions, 0 deletions

diff --git a/crates/shirabe-symfony-process/src/process.rs b/crates/shirabe-symfony-process/src/process.rs
new file mode 100644
index 00000000..6a078b9e
--- /dev/null
+++ b/crates/shirabe-symfony-process/src/process.rs
@@ -0,0 +1,1293 @@
+//! ref: composer/vendor/symfony/process/Process.php
+
+use crate::exception::invalid_argument_exception::InvalidArgumentException;
+use crate::exception::logic_exception::LogicException;
+use crate::exception::process_signaled_exception::ProcessSignaledException;
+use crate::exception::process_timed_out_exception::ProcessTimedOutException;
+use crate::exception::runtime_exception::RuntimeException;
+use crate::executable_finder::ExecutableFinder;
+use crate::pipes::pipes_interface::PipesInterface;
+use crate::pipes::unix_pipes::UnixPipes;
+use crate::pipes::windows_pipes::WindowsPipes;
+use crate::process_utils::ProcessUtils;
+use indexmap::IndexMap;
+use shirabe_php_shim::{Descriptor, PhpMixed, PhpResource, php_regex};
+use std::sync::OnceLock;
+
+/// A user-supplied callback invoked with the output type ("out"/"err") and a chunk of output.
+pub type UserCallback = Box<dyn FnMut(&str, &str) -> bool>;
+
+/// The callback built by `build_callback`. It receives the owning Process so it can append output
+/// to the internal buffers, mirroring the `$this`-capturing closure produced in PHP.
+type ProcessCallback = Box<dyn FnMut(&mut Process, &str, &str) -> bool>;
+
+/// PHP `$this->commandline` is `array|string`.
+#[derive(Debug, Clone)]
+enum CommandLine {
+    Array(Vec<String>),
+    String(String),
+}
+
+/// Test-only behaviour for a Process fabricated via [`Process::__mock`]: `getOutput`/
+/// `getErrorOutput`/`getExitCode`/`isSuccessful` return these fixed values instead of reading a
+/// real subprocess. Mirrors PHPUnit's `getMockBuilder(Process::class)->disableOriginalConstructor()`
+/// mocks used by the Composer test suite (e.g. `ZipDownloaderTest`). Held in [`Process::mock`];
+/// always `None` in production.
+#[derive(Debug, Clone)]
+pub struct ProcessMock {
+    pub exit_code: i64,
+    pub stdout: String,
+    pub stderr: String,
+}
+
+/// Process is a thin wrapper around proc_* functions to easily
+/// start independent PHP processes.
+pub struct Process {
+    callback: Option<ProcessCallback>,
+    commandline: CommandLine,
+    cwd: Option<String>,
+    env: IndexMap<String, PhpMixed>,
+    input: PhpMixed,
+    starttime: Option<f64>,
+    timeout: Option<f64>,
+    exitcode: Option<i64>,
+    fallback_status: IndexMap<String, PhpMixed>,
+    process_information: Option<IndexMap<String, PhpMixed>>,
+    stdout: Option<PhpResource>,
+    stderr: Option<PhpResource>,
+    process: Option<PhpResource>,
+    status: String,
+    incremental_output_offset: i64,
+    incremental_error_output_offset: i64,
+    tty: bool,
+    options: IndexMap<String, PhpMixed>,
+    use_file_handles: bool,
+    process_pipes: Option<Box<dyn PipesInterface>>,
+    latest_signal: Option<i64>,
+    cached_exit_code: Option<i64>,
+    /// Test-only mock state. `None` in production; set via [`Process::__mock`] in tests.
+    mock: Option<ProcessMock>,
+}
+
+impl std::fmt::Debug for Process {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        f.debug_struct("Process")
+            .field("commandline", &self.commandline)
+            .field("cwd", &self.cwd)
+            .field("status", &self.status)
+            .field("exitcode", &self.exitcode)
+            .finish_non_exhaustive()
+    }
+}
+
+fn descriptor(items: &[&str]) -> Descriptor {
+    match items {
+        ["pipe", mode] => Descriptor::Pipe(mode.to_string()),
+        ["file", path, mode] => Descriptor::File(path.to_string(), mode.to_string()),
+        _ => panic!("unsupported descriptor spec: {:?}", items),
+    }
+}
+
+/// PHP `(string)` cast for an environment value or stream payload.
+fn to_php_string(value: &PhpMixed) -> String {
+    match value {
+        PhpMixed::String(s) => s.clone(),
+        PhpMixed::Int(i) => i.to_string(),
+        PhpMixed::Float(f) => f.to_string(),
+        PhpMixed::Bool(b) => {
+            if *b {
+                "1".to_string()
+            } else {
+                String::new()
+            }
+        }
+        _ => String::new(),
+    }
+}
+
+impl Process {
+    pub const ERR: &'static str = "err";
+    pub const OUT: &'static str = "out";
+
+    pub const STATUS_READY: &'static str = "ready";
+    pub const STATUS_STARTED: &'static str = "started";
+    pub const STATUS_TERMINATED: &'static str = "terminated";
+
+    pub const STDOUT: i64 = 1;
+    pub const STDERR: i64 = 2;
+
+    // Timeout Precision in seconds.
+    pub const TIMEOUT_PRECISION: f64 = 0.2;
+
+    /// Exit codes translation table.
+    fn exit_code_text(code: i64) -> Option<&'static str> {
+        Some(match code {
+            0 => "OK",
+            1 => "General error",
+            2 => "Misuse of shell builtins",
+
+            126 => "Invoked command cannot execute",
+            127 => "Command not found",
+            128 => "Invalid exit argument",
+
+            // signals
+            129 => "Hangup",
+            130 => "Interrupt",
+            131 => "Quit and dump core",
+            132 => "Illegal instruction",
+            133 => "Trace/breakpoint trap",
+            134 => "Process aborted",
+            135 => "Bus error: \"access to undefined portion of memory object\"",
+            136 => "Floating point exception: \"erroneous arithmetic operation\"",
+            137 => "Kill (terminate immediately)",
+            138 => "User-defined 1",
+            139 => "Segmentation violation",
+            140 => "User-defined 2",
+            141 => "Write to pipe with no one reading",
+            142 => "Signal raised by alarm",
+            143 => "Termination (request to terminate)",
+            // 144 - not defined
+            145 => "Child process terminated, stopped (or continued*)",
+            146 => "Continue if stopped",
+            147 => "Stop executing temporarily",
+            148 => "Terminal stop signal",
+            149 => "Background process attempting to read from tty (\"in\")",
+            150 => "Background process attempting to write to tty (\"out\")",
+            151 => "Urgent data available on socket",
+            152 => "CPU time limit exceeded",
+            153 => "File size limit exceeded",
+            154 => "Signal raised by timer counting virtual time: \"virtual timer expired\"",
+            155 => "Profiling timer expired",
+            // 156 - not defined
+            157 => "Pollable event",
+            // 158 - not defined
+            159 => "Bad syscall",
+            _ => return None,
+        })
+    }
+
+    fn empty() -> Self {
+        let mut options = IndexMap::new();
+        options.insert("suppress_errors".to_string(), PhpMixed::Bool(true));
+        options.insert("bypass_shell".to_string(), PhpMixed::Bool(true));
+
+        Self {
+            callback: None,
+            commandline: CommandLine::Array(Vec::new()),
+            cwd: None,
+            env: IndexMap::new(),
+            input: PhpMixed::Null,
+            starttime: None,
+            timeout: None,
+            exitcode: None,
+            fallback_status: IndexMap::new(),
+            process_information: None,
+            stdout: None,
+            stderr: None,
+            process: None,
+            status: Self::STATUS_READY.to_string(),
+            incremental_output_offset: 0,
+            incremental_error_output_offset: 0,
+            tty: false,
+            options,
+            use_file_handles: false,
+            process_pipes: None,
+            latest_signal: None,
+            cached_exit_code: None,
+            mock: None,
+        }
+    }
+
+    /// For testing only. Builds an already-terminated mock Process whose getOutput/
+    /// getErrorOutput/getExitCode/isSuccessful return the configured values, without spawning a
+    /// real subprocess.
+    pub fn __mock(mock: ProcessMock) -> Self {
+        let mut this = Self::empty();
+        this.status = Self::STATUS_TERMINATED.to_string();
+        this.exitcode = Some(mock.exit_code);
+        this.mock = Some(mock);
+        this
+    }
+
+    pub fn new(
+        command: Vec<String>,
+        cwd: Option<String>,
+        env: Option<IndexMap<String, String>>,
+        input: PhpMixed,
+        timeout: Option<f64>,
+    ) -> anyhow::Result<Self> {
+        if !shirabe_php_shim::function_exists("proc_open") {
+            return Err(LogicException::new(
+                "The Process class relies on proc_open, which is not available on your PHP installation.".to_string(),
+            )
+            .into());
+        }
+
+        let mut this = Self::empty();
+        this.commandline = CommandLine::Array(command);
+        this.cwd = cwd;
+
+        // on Windows, if the cwd changed via chdir(), proc_open defaults to the dir where PHP was started
+        // PHP: null === $this->cwd && (\defined('ZEND_THREAD_SAFE') || '\\' === \DIRECTORY_SEPARATOR)
+        // `\defined('ZEND_THREAD_SAFE')` is unconditionally true in modern PHP (the constant always
+        // exists; its value merely reflects the NTS/ZTS build), so the disjunction is always true and
+        // the cwd is defaulted to getcwd() whenever it was null.
+        if this.cwd.is_none() {
+            this.cwd = shirabe_php_shim::getcwd();
+        }
+        if let Some(env) = env {
+            this.set_env(
+                env.into_iter()
+                    .map(|(k, v)| (k, PhpMixed::String(v)))
+                    .collect(),
+            );
+        }
+
+        this.set_input(input)?;
+        this.set_timeout(timeout)?;
+        this.use_file_handles = cfg!(windows);
+
+        Ok(this)
+    }
+
+    /// Creates a Process instance as a command-line to be run in a shell wrapper.
+    pub fn from_shell_commandline(
+        command: &str,
+        cwd: Option<&str>,
+        env: Option<IndexMap<String, String>>,
+        input: PhpMixed,
+        timeout: Option<f64>,
+    ) -> anyhow::Result<Self> {
+        let mut process = Self::new(Vec::new(), cwd.map(String::from), env, input, timeout)?;
+        process.commandline = CommandLine::String(command.to_string());
+
+        Ok(process)
+    }
+
+    /// Runs the process.
+    pub fn run(
+        &mut self,
+        callback: Option<UserCallback>,
+        env: IndexMap<String, PhpMixed>,
+    ) -> anyhow::Result<i64> {
+        self.start(callback, env)?;
+
+        self.wait(None)
+    }
+
+    /// Starts the process and returns after writing the input to STDIN.
+    pub fn start(
+        &mut self,
+        callback: Option<UserCallback>,
+        mut env: IndexMap<String, PhpMixed>,
+    ) -> anyhow::Result<()> {
+        if self.is_running() {
+            return Err(RuntimeException::new("Process is already running.".to_string()).into());
+        }
+
+        self.reset_process_data();
+        self.starttime = Some(shirabe_php_shim::microtime());
+        self.callback = Some(self.build_callback(callback));
+        let mut descriptors = self.get_descriptors();
+
+        if !self.env.is_empty() {
+            // non-Windows: $env += $this->env;
+            for (k, v) in &self.env {
+                env.entry(k.clone()).or_insert_with(|| v.clone());
+            }
+        }
+
+        for (k, v) in self.get_default_env() {
+            env.entry(k).or_insert(v);
+        }
+
+        let mut commandline = match &self.commandline {
+            CommandLine::Array(args) => {
+                let mut cmd = args
+                    .iter()
+                    .map(|a| self.escape_argument(Some(a)))
+                    .collect::<Vec<_>>()
+                    .join(" ");
+
+                if !cfg!(windows) {
+                    // exec is mandatory to deal with sending a signal to the process
+                    cmd = format!("exec {}", cmd);
+                }
+                cmd
+            }
+            CommandLine::String(s) => self.replace_placeholders(s, &env)?,
+        };
+
+        if cfg!(windows) {
+            commandline = self.prepare_windows_command_line(&commandline, &mut env)?;
+        } else if !self.use_file_handles && self.is_sigchild_enabled() {
+            // last exit code is output on the fourth pipe and caught to work around --enable-sigchild
+            descriptors.push(descriptor(&["pipe", "w"]));
+
+            commandline = format!("{{ ({}) <&3 3<&- 3>/dev/null & }} 3<&0;", commandline);
+            commandline.push_str(
+                "pid=$!; echo $pid >&3; wait $pid 2>/dev/null; code=$?; echo $code >&3; exit $code",
+            );
+
+            // Workaround for the bug, when PTS functionality is enabled.
+            let _pts_workaround = shirabe_php_shim::fopen("Process.php", "r");
+        }
+
+        let mut env_pairs: Vec<String> = Vec::new();
+        for (k, v) in &env {
+            let is_false = matches!(v, PhpMixed::Bool(false));
+            if !is_false && !["argc", "argv", "ARGC", "ARGV"].contains(&k.as_str()) {
+                env_pairs.push(format!("{}={}", k, to_php_string(v)));
+            }
+        }
+
+        if !self
+            .cwd
+            .as_deref()
+            .map(shirabe_php_shim::is_dir)
+            .unwrap_or(false)
+        {
+            return Err(RuntimeException::new(format!(
+                "The provided cwd \"{}\" does not exist.",
+                self.cwd.as_deref().unwrap_or("")
+            ))
+            .into());
+        }
+
+        let cwd = self.cwd.clone();
+        let options = self.options.clone();
+        let process = {
+            let pipes = self.process_pipes.as_mut().unwrap().pipes_mut();
+            shirabe_php_shim::proc_open(
+                &commandline,
+                &descriptors,
+                pipes,
+                cwd.as_deref().map(std::path::Path::new),
+                Some(&env_pairs),
+                Some(&options),
+            )
+        };
+        self.process = process.ok();
+
+        if self.process.is_none() {
+            return Err(
+                RuntimeException::new("Unable to launch a new process.".to_string()).into(),
+            );
+        }
+        self.status = Self::STATUS_STARTED.to_string();
+
+        if descriptors.len() > 3 {
+            let pipe3 = self
+                .process_pipes
+                .as_ref()
+                .unwrap()
+                .pipes()
+                .get(&3)
+                .cloned();
+            let pid = pipe3
+                .and_then(|p| shirabe_php_shim::fgets(&p, None))
+                .map(|s| s.trim().parse::<i64>().unwrap_or(0))
+                .unwrap_or(0);
+            self.fallback_status
+                .insert("pid".to_string(), PhpMixed::Int(pid));
+        }
+
+        if self.tty {
+            return Ok(());
+        }
+
+        self.update_status(false);
+        self.check_timeout()?;
+        Ok(())
+    }
+
+    /// Waits for the process to terminate.
+    pub fn wait(&mut self, callback: Option<UserCallback>) -> anyhow::Result<i64> {
+        self.require_process_is_started("wait")?;
+
+        self.update_status(false);
+
+        if let Some(callback) = callback {
+            self.callback = Some(self.build_callback(Some(callback)));
+        }
+
+        loop {
+            self.check_timeout()?;
+            let running = self.is_running()
+                && (cfg!(windows) || self.process_pipes.as_ref().unwrap().are_open());
+            self.read_pipes(running, !cfg!(windows) || !running);
+            if !running {
+                break;
+            }
+        }
+
+        while self.is_running() {
+            self.check_timeout()?;
+            shirabe_php_shim::usleep(1000);
+        }
+
+        let signaled = self
+            .process_information
+            .as_ref()
+            .and_then(|i| i.get("signaled"))
+            .map(shirabe_php_shim::php_truthy)
+            .unwrap_or(false);
+        let termsig = self
+            .process_information
+            .as_ref()
+            .and_then(|i| i.get("termsig"))
+            .and_then(|v| v.as_int());
+        if signaled && termsig != self.latest_signal {
+            return Err(ProcessSignaledException::new(self)?.into());
+        }
+
+        Ok(self.exitcode.unwrap_or(0))
+    }
+
+    /// Returns the Pid (process identifier), if applicable.
+    pub fn get_pid(&mut self) -> Option<i64> {
+        if self.is_running() {
+            self.process_information
+                .as_ref()
+                .and_then(|i| i.get("pid"))
+                .and_then(|v| v.as_int())
+        } else {
+            None
+        }
+    }
+
+    /// Returns the current output of the process (STDOUT).
+    pub fn get_output(&mut self) -> anyhow::Result<String> {
+        if let Some(mock) = &self.mock {
+            return Ok(mock.stdout.clone());
+        }
+
+        self.read_pipes_for_output("getOutput", false)?;
+
+        Ok(
+            shirabe_php_shim::stream_get_contents3(self.stdout.as_ref().unwrap(), -1, 0)
+                .unwrap_or_default(),
+        )
+    }
+
+    /// Returns the current error output of the process (STDERR).
+    pub fn get_error_output(&mut self) -> anyhow::Result<String> {
+        if let Some(mock) = &self.mock {
+            return Ok(mock.stderr.clone());
+        }
+
+        self.read_pipes_for_output("getErrorOutput", false)?;
+
+        Ok(
+            shirabe_php_shim::stream_get_contents3(self.stderr.as_ref().unwrap(), -1, 0)
+                .unwrap_or_default(),
+        )
+    }
+
+    /// Returns the exit code returned by the process.
+    pub fn get_exit_code(&mut self) -> Option<i64> {
+        if self.mock.is_some() {
+            return self.exitcode;
+        }
+
+        self.update_status(false);
+
+        self.exitcode
+    }
+
+    /// Returns a string representation for the exit code returned by the process.
+    pub fn get_exit_code_text(&mut self) -> Option<String> {
+        let exitcode = self.get_exit_code()?;
+
+        Some(
+            Self::exit_code_text(exitcode)
+                .unwrap_or("Unknown error")
+                .to_string(),
+        )
+    }
+
+    /// Checks if the process ended successfully.
+    pub fn is_successful(&mut self) -> bool {
+        self.get_exit_code() == Some(0)
+    }
+
+    /// Returns the number of the signal that caused the child process to terminate.
+    pub fn get_term_signal(&mut self) -> anyhow::Result<i64> {
+        self.require_process_is_terminated("getTermSignal")?;
+
+        let termsig = self
+            .process_information
+            .as_ref()
+            .and_then(|i| i.get("termsig"))
+            .and_then(|v| v.as_int());
+        if self.is_sigchild_enabled() && termsig == Some(-1) {
+            return Err(RuntimeException::new(
+                "This PHP has been compiled with --enable-sigchild. Term signal cannot be retrieved.".to_string(),
+            )
+            .into());
+        }
+
+        Ok(termsig.unwrap_or(0))
+    }
+
+    /// Checks if the process is currently running.
+    pub fn is_running(&mut self) -> bool {
+        if Self::STATUS_STARTED != self.status {
+            return false;
+        }
+
+        self.update_status(false);
+
+        self.process_information
+            .as_ref()
+            .and_then(|i| i.get("running"))
+            .map(shirabe_php_shim::php_truthy)
+            .unwrap_or(false)
+    }
+
+    /// Checks if the process has been started with no regard to the current state.
+    pub fn is_started(&self) -> bool {
+        Self::STATUS_READY != self.status
+    }
+
+    /// Checks if the process is terminated.
+    pub fn is_terminated(&mut self) -> bool {
+        self.update_status(false);
+
+        Self::STATUS_TERMINATED == self.status
+    }
+
+    /// Stops the process.
+    pub fn stop(&mut self, timeout: f64, signal: Option<i64>) -> Option<i64> {
+        let timeout_micro = shirabe_php_shim::microtime() + timeout;
+        if self.is_running() {
+            // given SIGTERM may not be defined and that "proc_terminate" uses the constant value
+            // and not the constant itself, we use the same here
+            let _ = self.do_signal(15, false);
+            loop {
+                shirabe_php_shim::usleep(1000);
+                if !(self.is_running() && shirabe_php_shim::microtime() < timeout_micro) {
+                    break;
+                }
+            }
+
+            if self.is_running() {
+                // Avoid exception here: process is supposed to be running, but it might have
+                // stopped just after this line. Silently discard the error.
+                let _ = self.do_signal(signal.filter(|&s| s != 0).unwrap_or(9), false);
+            }
+        }
+
+        if self.is_running() {
+            if self.fallback_status.contains_key("pid") {
+                self.fallback_status.shift_remove("pid");
+
+                return self.stop(0.0, signal);
+            }
+            self.close();
+        }
+
+        self.exitcode
+    }
+
+    /// Adds a line to the STDOUT stream.
+    pub fn add_output(&mut self, line: &str) {
+        let stdout = self.stdout.as_ref().unwrap();
+        shirabe_php_shim::fseek(stdout, 0, shirabe_php_shim::SEEK_END);
+        shirabe_php_shim::fwrite(stdout, line, Some(line.len() as i64));
+        shirabe_php_shim::fseek(
+            stdout,
+            self.incremental_output_offset,
+            shirabe_php_shim::SEEK_SET,
+        );
+    }
+
+    /// Adds a line to the STDERR stream.
+    pub fn add_error_output(&mut self, line: &str) {
+        let stderr = self.stderr.as_ref().unwrap();
+        shirabe_php_shim::fseek(stderr, 0, shirabe_php_shim::SEEK_END);
+        shirabe_php_shim::fwrite(stderr, line, Some(line.len() as i64));
+        shirabe_php_shim::fseek(
+            stderr,
+            self.incremental_error_output_offset,
+            shirabe_php_shim::SEEK_SET,
+        );
+    }
+
+    /// Gets the command line to be executed.
+    pub fn get_command_line(&self) -> String {
+        match &self.commandline {
+            CommandLine::Array(args) => args
+                .iter()
+                .map(|a| self.escape_argument(Some(a)))
+                .collect::<Vec<_>>()
+                .join(" "),
+            CommandLine::String(s) => s.clone(),
+        }
+    }
+
+    /// Gets the process timeout in seconds (max. runtime).
+    pub fn get_timeout(&self) -> Option<f64> {
+        self.timeout
+    }
+
+    /// Sets the process timeout (max. runtime) in seconds.
+    pub fn set_timeout(&mut self, timeout: Option<f64>) -> anyhow::Result<&mut Self> {
+        self.timeout = self.validate_timeout(timeout)?;
+
+        Ok(self)
+    }
+
+    /// Enables or disables the TTY mode.
+    pub fn set_tty(&mut self, tty: bool) -> anyhow::Result<&mut Self> {
+        if cfg!(windows) && tty {
+            return Err(RuntimeException::new(
+                "TTY mode is not supported on Windows platform.".to_string(),
+            )
+            .into());
+        }
+
+        if tty && !Self::is_tty_supported() {
+            return Err(RuntimeException::new(
+                "TTY mode requires /dev/tty to be read/writable.".to_string(),
+            )
+            .into());
+        }
+
+        self.tty = tty;
+
+        Ok(self)
+    }
+
+    /// Checks if the TTY mode is enabled.
+    pub fn is_tty(&self) -> bool {
+        self.tty
+    }
+
+    /// Gets the working directory.
+    pub fn get_working_directory(&self) -> Option<String> {
+        if self.cwd.is_none() {
+            // getcwd() will return false if any one of the parent directories does not have
+            // the readable or search mode set, even if the current directory does
+            return shirabe_php_shim::getcwd().filter(|s| !s.is_empty());
+        }
+
+        self.cwd.clone()
+    }
+
+    /// Sets the environment variables.
+    pub fn set_env(&mut self, env: IndexMap<String, PhpMixed>) -> &mut Self {
+        self.env = env;
+
+        self
+    }
+
+    /// Sets the input.
+    pub fn set_input(&mut self, input: PhpMixed) -> anyhow::Result<&mut Self> {
+        if self.is_running() {
+            return Err(LogicException::new(
+                "Input cannot be set while the process is running.".to_string(),
+            )
+            .into());
+        }
+
+        self.input =
+            ProcessUtils::validate_input("Symfony\\Component\\Process\\Process::setInput", input)?;
+
+        Ok(self)
+    }
+
+    /// Performs a check between the timeout definition and the time the process started.
+    pub fn check_timeout(&mut self) -> anyhow::Result<()> {
+        if Self::STATUS_STARTED != self.status {
+            return Ok(());
+        }
+
+        if let Some(timeout) = self.timeout
+            && timeout < shirabe_php_shim::microtime() - self.starttime.unwrap_or(0.0)
+        {
+            self.stop(0.0, None);
+
+            return Err(ProcessTimedOutException::new(self).into());
+        }
+
+        Ok(())
+    }
+
+    /// Returns whether TTY is supported on the current operating system.
+    pub fn is_tty_supported() -> bool {
+        static IS_TTY_SUPPORTED: OnceLock<bool> = OnceLock::new();
+
+        *IS_TTY_SUPPORTED.get_or_init(|| {
+            let mut pipes = IndexMap::new();
+            shirabe_php_shim::proc_open(
+                "echo 1 >/dev/null",
+                &[
+                    descriptor(&["file", "/dev/tty", "r"]),
+                    descriptor(&["file", "/dev/tty", "w"]),
+                    descriptor(&["file", "/dev/tty", "w"]),
+                ],
+                &mut pipes,
+                None,
+                None,
+                None,
+            )
+            .is_ok()
+        })
+    }
+
+    /// Creates the descriptors needed by the proc_open.
+    fn get_descriptors(&mut self) -> Vec<Descriptor> {
+        // TODO(plugin): $this->input instanceof \Iterator -> rewind() is not modeled.
+        if cfg!(windows) {
+            self.process_pipes = Some(Box::new(WindowsPipes::new(self.input.clone())));
+        } else {
+            self.process_pipes = Some(Box::new(UnixPipes::new(
+                Some(self.is_tty()),
+                self.input.clone(),
+            )));
+        }
+
+        self.process_pipes.as_mut().unwrap().get_descriptors()
+    }
+
+    /// Builds up the callback used by wait().
+    fn build_callback(&self, callback: Option<UserCallback>) -> ProcessCallback {
+        let mut callback = callback;
+        let out = Self::OUT;
+
+        Box::new(
+            move |this: &mut Process, r#type: &str, data: &str| -> bool {
+                if out == r#type {
+                    this.add_output(data);
+                } else {
+                    this.add_error_output(data);
+                }
+
+                match callback.as_mut() {
+                    Some(cb) => cb(r#type, data),
+                    None => false,
+                }
+            },
+        )
+    }
+
+    /// Updates the status of the process, reads pipes.
+    fn update_status(&mut self, blocking: bool) {
+        if Self::STATUS_STARTED != self.status {
+            return;
+        }
+
+        self.process_information = Some(shirabe_php_shim::proc_get_status(
+            self.process.as_ref().unwrap(),
+        ));
+        let running = self
+            .process_information
+            .as_ref()
+            .unwrap()
+            .get("running")
+            .map(shirabe_php_shim::php_truthy)
+            .unwrap_or(false);
+
+        // In PHP < 8.3, "proc_get_status" only returns the correct exit status on the first call.
+        if shirabe_php_shim::PHP_VERSION_ID < 80300 {
+            let exitcode = self
+                .process_information
+                .as_ref()
+                .unwrap()
+                .get("exitcode")
+                .and_then(|v| v.as_int());
+            if self.cached_exit_code.is_none() && !running && exitcode != Some(-1) {
+                self.cached_exit_code = exitcode;
+            }
+
+            if let Some(cached) = self.cached_exit_code
+                && !running
+                && exitcode == Some(-1)
+            {
+                self.process_information
+                    .as_mut()
+                    .unwrap()
+                    .insert("exitcode".to_string(), PhpMixed::Int(cached));
+            }
+        }
+
+        self.read_pipes(running && blocking, !cfg!(windows) || !running);
+
+        if !self.fallback_status.is_empty() && self.is_sigchild_enabled() {
+            // processInformation = fallbackStatus + processInformation (fallback keys win)
+            let mut merged = self.fallback_status.clone();
+            for (k, v) in self.process_information.take().unwrap() {
+                merged.entry(k).or_insert(v);
+            }
+            self.process_information = Some(merged);
+        }
+
+        if !running {
+            self.close();
+        }
+    }
+
+    /// Returns whether PHP has been compiled with the '--enable-sigchild' option or not.
+    fn is_sigchild_enabled(&self) -> bool {
+        static SIGCHILD: OnceLock<bool> = OnceLock::new();
+
+        if let Some(v) = SIGCHILD.get() {
+            return *v;
+        }
+
+        if !shirabe_php_shim::function_exists("phpinfo") {
+            return *SIGCHILD.get_or_init(|| false);
+        }
+
+        shirabe_php_shim::ob_start();
+        shirabe_php_shim::phpinfo(shirabe_php_shim::INFO_GENERAL);
+
+        *SIGCHILD.get_or_init(|| {
+            shirabe_php_shim::str_contains(
+                &shirabe_php_shim::ob_get_clean().unwrap_or_default(),
+                "--enable-sigchild",
+            )
+        })
+    }
+
+    /// Reads pipes for the freshest output.
+    fn read_pipes_for_output(&mut self, caller: &str, blocking: bool) -> anyhow::Result<()> {
+        self.require_process_is_started(caller)?;
+
+        self.update_status(blocking);
+        Ok(())
+    }
+
+    /// Validates and returns the filtered timeout.
+    fn validate_timeout(&self, timeout: Option<f64>) -> anyhow::Result<Option<f64>> {
+        let timeout = timeout.unwrap_or(0.0);
+
+        if timeout == 0.0 {
+            Ok(None)
+        } else if timeout < 0.0 {
+            Err(InvalidArgumentException::new(
+                "The timeout value must be a valid positive integer or float number.".to_string(),
+            )
+            .into())
+        } else {
+            Ok(Some(timeout))
+        }
+    }
+
+    /// Reads pipes, executes callback.
+    fn read_pipes(&mut self, blocking: bool, close: bool) {
+        let result = self
+            .process_pipes
+            .as_mut()
+            .unwrap()
+            .read_and_write(blocking, close);
+
+        let mut callback = self.callback.take();
+        for (r#type, data) in result {
+            if r#type != 3 {
+                if let Some(cb) = callback.as_mut() {
+                    cb(
+                        self,
+                        if Self::STDOUT == r#type {
+                            Self::OUT
+                        } else {
+                            Self::ERR
+                        },
+                        &data,
+                    );
+                }
+            } else if !self.fallback_status.contains_key("signaled") {
+                self.fallback_status.insert(
+                    "exitcode".to_string(),
+                    PhpMixed::Int(data.trim().parse().unwrap_or(0)),
+                );
+            }
+        }
+        self.callback = callback;
+    }
+
+    /// Closes process resource, closes file handles, sets the exitcode.
+    fn close(&mut self) -> i64 {
+        if let Some(p) = self.process_pipes.as_mut() {
+            p.close();
+        }
+        if self.process.is_some() {
+            shirabe_php_shim::proc_close(self.process.as_ref().unwrap());
+            self.process = None;
+        }
+        self.exitcode = self
+            .process_information
+            .as_ref()
+            .and_then(|i| i.get("exitcode"))
+            .and_then(|v| v.as_int());
+        self.status = Self::STATUS_TERMINATED.to_string();
+
+        if self.exitcode == Some(-1) {
+            let signaled = self
+                .process_information
+                .as_ref()
+                .and_then(|i| i.get("signaled"))
+                .map(shirabe_php_shim::php_truthy)
+                .unwrap_or(false);
+            let termsig = self
+                .process_information
+                .as_ref()
+                .and_then(|i| i.get("termsig"))
+                .and_then(|v| v.as_int())
+                .unwrap_or(0);
+            if signaled && termsig > 0 {
+                // if process has been signaled, no exitcode but a valid termsig, apply Unix convention
+                self.exitcode = Some(128 + termsig);
+            } else if self.is_sigchild_enabled()
+                && let Some(i) = self.process_information.as_mut()
+            {
+                i.insert("signaled".to_string(), PhpMixed::Bool(true));
+                i.insert("termsig".to_string(), PhpMixed::Int(-1));
+            }
+        }
+
+        // Free memory from self-reference callback created by buildCallback
+        self.callback = None;
+
+        self.exitcode.unwrap_or(-1)
+    }
+
+    /// Resets data related to the latest run of the process.
+    fn reset_process_data(&mut self) {
+        self.starttime = None;
+        self.callback = None;
+        self.exitcode = None;
+        self.fallback_status = IndexMap::new();
+        self.process_information = None;
+        // php://temp is an in-memory stream; fopen never fails for it.
+        self.stdout = Some(
+            shirabe_php_shim::fopen(&format!("php://temp/maxmemory:{}", 1024 * 1024), "w+")
+                .unwrap(),
+        );
+        self.stderr = Some(
+            shirabe_php_shim::fopen(&format!("php://temp/maxmemory:{}", 1024 * 1024), "w+")
+                .unwrap(),
+        );
+        self.process = None;
+        self.latest_signal = None;
+        self.status = Self::STATUS_READY.to_string();
+        self.incremental_output_offset = 0;
+        self.incremental_error_output_offset = 0;
+    }
+
+    /// Sends a POSIX signal to the process.
+    fn do_signal(&mut self, signal: i64, throw_exception: bool) -> anyhow::Result<bool> {
+        let pid = match self.get_pid() {
+            None => {
+                if throw_exception {
+                    return Err(LogicException::new(
+                        "Cannot send signal on a non running process.".to_string(),
+                    )
+                    .into());
+                }
+
+                return Ok(false);
+            }
+            Some(pid) => pid,
+        };
+
+        if cfg!(windows) {
+            let mut output: Vec<String> = Vec::new();
+            let mut exit_code: i64 = 0;
+            shirabe_php_shim::exec(
+                &format!("taskkill /F /T /PID {} 2>&1", pid),
+                Some(&mut output),
+                Some(&mut exit_code),
+            );
+            if exit_code != 0 && self.is_running() {
+                if throw_exception {
+                    return Err(RuntimeException::new(format!(
+                        "Unable to kill the process ({}).",
+                        output.join(" ")
+                    ))
+                    .into());
+                }
+
+                return Ok(false);
+            }
+        } else {
+            let ok;
+            if !self.is_sigchild_enabled() {
+                ok = shirabe_php_shim::proc_terminate(self.process.as_ref().unwrap(), signal);
+            } else if shirabe_php_shim::function_exists("posix_kill") {
+                ok = shirabe_php_shim::posix_kill(pid, signal);
+            } else {
+                let mut pipes = IndexMap::new();
+                let opened = shirabe_php_shim::proc_open(
+                    &format!("kill -{} {}", signal, pid),
+                    &[
+                        Descriptor::Inherit,
+                        Descriptor::Inherit,
+                        descriptor(&["pipe", "w"]),
+                    ],
+                    &mut pipes,
+                    None,
+                    None,
+                    None,
+                );
+                ok = match opened {
+                    Ok(_) => pipes
+                        .get(&2)
+                        .and_then(|p| shirabe_php_shim::fgets(p, None))
+                        .is_none(),
+                    Err(_) => false,
+                };
+            }
+            if !ok {
+                if throw_exception {
+                    return Err(RuntimeException::new(format!(
+                        "Error while sending signal \"{}\".",
+                        signal
+                    ))
+                    .into());
+                }
+
+                return Ok(false);
+            }
+        }
+
+        self.latest_signal = Some(signal);
+        self.fallback_status
+            .insert("signaled".to_string(), PhpMixed::Bool(true));
+        self.fallback_status
+            .insert("exitcode".to_string(), PhpMixed::Int(-1));
+        self.fallback_status.insert(
+            "termsig".to_string(),
+            PhpMixed::Int(self.latest_signal.unwrap()),
+        );
+
+        Ok(true)
+    }
+
+    fn prepare_windows_command_line(
+        &mut self,
+        cmd: &str,
+        env: &mut IndexMap<String, PhpMixed>,
+    ) -> anyhow::Result<String> {
+        let uid = shirabe_php_shim::uniqid("", true);
+        let mut var_count = 0;
+        let mut var_cache: IndexMap<String, String> = IndexMap::new();
+        let cmd = shirabe_php_shim::preg_replace_callback(
+            php_regex!(
+                r#"/"(?:(
+                [^"%!^]*+
+                (?:
+                    (?: !LF! | "(?:\^[%!^])?+" )
+                    [^"%!^]*+
+                )++
+            ) | [^"]*+ )"/x"#
+            ),
+            |m: &[Option<String>]| -> anyhow::Result<String> {
+                let m0 = m.first().cloned().flatten().unwrap_or_default();
+                let m1 = m.get(1).cloned().flatten();
+                if m1.is_none() {
+                    return Ok(m0);
+                }
+                if let Some(cached) = var_cache.get(&m0) {
+                    return Ok(cached.clone());
+                }
+                let mut value = m1.unwrap();
+                if value.contains('\0') {
+                    value = value.replace('\0', "?");
+                }
+                if shirabe_php_shim::strpbrk(&value, "\"%!\n").is_none() {
+                    return Ok(format!("\"{}\"", value));
+                }
+
+                for (from, to) in [
+                    ("!LF!", "\n"),
+                    ("\"^!\"", "!"),
+                    ("\"^%\"", "%"),
+                    ("\"^^\"", "^"),
+                    ("\"\"", "\""),
+                ] {
+                    value = value.replace(from, to);
+                }
+                value = format!(
+                    "\"{}\"",
+                    shirabe_php_shim::preg_replace(php_regex!(r#"/(\\*)"/"#), "$1$1\\\"", &value)
+                );
+                var_count += 1;
+                let var = format!("{}{}", uid, var_count);
+
+                env.insert(var.clone(), PhpMixed::String(value));
+
+                let replacement = format!("!{}!", var);
+                var_cache.insert(m0, replacement.clone());
+                Ok(replacement)
+            },
+            cmd,
+        )?;
+
+        static COM_SPEC: OnceLock<Option<String>> = OnceLock::new();
+        let com_spec = COM_SPEC
+            .get_or_init(|| {
+                ExecutableFinder::new()
+                    .find("cmd.exe", None, &[])
+                    .map(|spec| {
+                        format!(
+                            "\"{}\"",
+                            shirabe_php_shim::preg_replace(
+                                php_regex!(r#"{(\\*+)"}"#),
+                                "$1$1\\\"",
+                                &spec,
+                            )
+                        )
+                    })
+            })
+            .clone();
+
+        let mut cmd = format!(
+            "{} /V:ON /E:ON /D /C ({})",
+            com_spec.unwrap_or_else(|| "cmd".to_string()),
+            cmd.replace('\n', " ")
+        );
+        for (offset, filename) in self.process_pipes.as_ref().unwrap().get_files() {
+            cmd.push_str(&format!(" {}>\"{}\"", offset, filename));
+        }
+
+        Ok(cmd)
+    }
+
+    /// Ensures the process is running or terminated.
+    fn require_process_is_started(&self, function_name: &str) -> anyhow::Result<()> {
+        if !self.is_started() {
+            return Err(LogicException::new(format!(
+                "Process must be started before calling \"{}()\".",
+                function_name
+            ))
+            .into());
+        }
+        Ok(())
+    }
+
+    /// Ensures the process is terminated.
+    fn require_process_is_terminated(&mut self, function_name: &str) -> anyhow::Result<()> {
+        if !self.is_terminated() {
+            return Err(LogicException::new(format!(
+                "Process must be terminated before calling \"{}()\".",
+                function_name
+            ))
+            .into());
+        }
+        Ok(())
+    }
+
+    /// Escapes a string to be used as a shell argument.
+    fn escape_argument(&self, argument: Option<&str>) -> String {
+        let argument = match argument {
+            None | Some("") => return "\"\"".to_string(),
+            Some(a) => a,
+        };
+        if !cfg!(windows) {
+            return format!("'{}'", argument.replace('\'', "'\\''"));
+        }
+        let mut argument = argument.to_string();
+        if argument.contains('\0') {
+            argument = argument.replace('\0', "?");
+        }
+        if !shirabe_php_shim::preg_match(
+            php_regex!(r#"/[()%!^"<>&|\s\[\]=;*?'$]/"#),
+            &argument,
+            &mut Vec::new(),
+        ) {
+            return argument;
+        }
+        argument = shirabe_php_shim::preg_replace(php_regex!(r"/(\\+)$/"), "$1$1", &argument);
+
+        let mut result = argument;
+        for (from, to) in [
+            ("\"", "\"\""),
+            ("^", "\"^^\""),
+            ("%", "\"^%\""),
+            ("!", "\"^!\""),
+            ("\n", "!LF!"),
+        ] {
+            result = result.replace(from, to);
+        }
+        format!("\"{}\"", result)
+    }
+
+    fn replace_placeholders(
+        &self,
+        commandline: &str,
+        env: &IndexMap<String, PhpMixed>,
+    ) -> anyhow::Result<String> {
+        shirabe_php_shim::preg_replace_callback(
+            php_regex!(r#"/"\$\{:([_a-zA-Z]+[_a-zA-Z0-9]*)\}"/"#),
+            |matches: &[Option<String>]| -> anyhow::Result<String> {
+                let key = matches.get(1).cloned().flatten().unwrap_or_default();
+                match env.get(&key) {
+                    None => Err(InvalidArgumentException::new(format!(
+                        "Command line is missing a value for parameter \"{}\": {}",
+                        key, commandline
+                    ))
+                    .into()),
+                    Some(PhpMixed::Bool(false)) => Err(InvalidArgumentException::new(format!(
+                        "Command line is missing a value for parameter \"{}\": {}",
+                        key, commandline
+                    ))
+                    .into()),
+                    Some(v) => Ok(self.escape_argument(Some(&to_php_string(v)))),
+                }
+            },
+            commandline,
+        )
+    }
+
+    fn get_default_env(&self) -> IndexMap<String, PhpMixed> {
+        let env: IndexMap<String, String> = shirabe_php_shim::getenv_all()
+            .map(|(k, v)| {
+                (
+                    k.to_string_lossy().into_owned(),
+                    v.to_string_lossy().into_owned(),
+                )
+            })
+            .collect();
+        let server = shirabe_php_shim::PHP_SERVER.lock().unwrap();
+
+        // non-Windows: array_intersect_key($env, $_SERVER) ?: $env
+        let mut intersect: IndexMap<String, PhpMixed> = IndexMap::new();
+        for (k, v) in &env {
+            if server.get(k).is_some() {
+                intersect.insert(k.clone(), PhpMixed::String(v.clone()));
+            }
+        }
+        let env_map: IndexMap<String, PhpMixed> = if intersect.is_empty() {
+            env.into_iter()
+                .map(|(k, v)| (k, PhpMixed::String(v)))
+                .collect()
+        } else {
+            intersect
+        };
+
+        // $_ENV + env_map
+        let mut result: IndexMap<String, PhpMixed> = shirabe_php_shim::PHP_ENV
+            .lock()
+            .unwrap()
+            .get_all()
+            .map(|(k, v)| {
+                (
+                    k.to_string_lossy().into_owned(),
+                    PhpMixed::String(v.to_string_lossy().into_owned()),
+                )
+            })
+            .collect();
+        for (k, v) in env_map {
+            result.entry(k).or_insert(v);
+        }
+        result
+    }
+}
+
+impl Drop for Process {
+    fn drop(&mut self) {
+        self.stop(0.0, None);
+    }
+}