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vendor/symfony/process/Pipes/AbstractPipes.php

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+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Process\Pipes;
+
+use Symfony\Component\Process\Exception\InvalidArgumentException;
+
+/**
+ * @author Romain Neutron <imprec@gmail.com>
+ *
+ * @internal
+ */
+abstract class AbstractPipes implements PipesInterface
+{
+    public $pipes = [];
+
+    private $inputBuffer = '';
+    private $input;
+    private $blocked = true;
+    private $lastError;
+
+    /**
+     * @param resource|string|int|float|bool|\Iterator|null $input
+     */
+    public function __construct($input)
+    {
+        if (\is_resource($input) || $input instanceof \Iterator) {
+            $this->input = $input;
+        } elseif (\is_string($input)) {
+            $this->inputBuffer = $input;
+        } else {
+            $this->inputBuffer = (string) $input;
+        }
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function close()
+    {
+        foreach ($this->pipes as $pipe) {
+            if (\is_resource($pipe)) {
+                fclose($pipe);
+            }
+        }
+        $this->pipes = [];
+    }
+
+    /**
+     * Returns true if a system call has been interrupted.
+     */
+    protected function hasSystemCallBeenInterrupted(): bool
+    {
+        $lastError = $this->lastError;
+        $this->lastError = null;
+
+        // stream_select returns false when the `select` system call is interrupted by an incoming signal
+        return null !== $lastError && false !== stripos($lastError, 'interrupted system call');
+    }
+
+    /**
+     * Unblocks streams.
+     */
+    protected function unblock()
+    {
+        if (!$this->blocked) {
+            return;
+        }
+
+        foreach ($this->pipes as $pipe) {
+            stream_set_blocking($pipe, 0);
+        }
+        if (\is_resource($this->input)) {
+            stream_set_blocking($this->input, 0);
+        }
+
+        $this->blocked = false;
+    }
+
+    /**
+     * Writes input to stdin.
+     *
+     * @throws InvalidArgumentException When an input iterator yields a non supported value
+     */
+    protected function write(): ?array
+    {
+        if (!isset($this->pipes[0])) {
+            return null;
+        }
+        $input = $this->input;
+
+        if ($input instanceof \Iterator) {
+            if (!$input->valid()) {
+                $input = null;
+            } elseif (\is_resource($input = $input->current())) {
+                stream_set_blocking($input, 0);
+            } elseif (!isset($this->inputBuffer[0])) {
+                if (!\is_string($input)) {
+                    if (!\is_scalar($input)) {
+                        throw new InvalidArgumentException(sprintf('"%s" yielded a value of type "%s", but only scalars and stream resources are supported.', get_debug_type($this->input), get_debug_type($input)));
+                    }
+                    $input = (string) $input;
+                }
+                $this->inputBuffer = $input;
+                $this->input->next();
+                $input = null;
+            } else {
+                $input = null;
+            }
+        }
+
+        $r = $e = [];
+        $w = [$this->pipes[0]];
+
+        // let's have a look if something changed in streams
+        if (false === @stream_select($r, $w, $e, 0, 0)) {
+            return null;
+        }
+
+        foreach ($w as $stdin) {
+            if (isset($this->inputBuffer[0])) {
+                $written = fwrite($stdin, $this->inputBuffer);
+                $this->inputBuffer = substr($this->inputBuffer, $written);
+                if (isset($this->inputBuffer[0])) {
+                    return [$this->pipes[0]];
+                }
+            }
+
+            if ($input) {
+                while (true) {
+                    $data = fread($input, self::CHUNK_SIZE);
+                    if (!isset($data[0])) {
+                        break;
+                    }
+                    $written = fwrite($stdin, $data);
+                    $data = substr($data, $written);
+                    if (isset($data[0])) {
+                        $this->inputBuffer = $data;
+
+                        return [$this->pipes[0]];
+                    }
+                }
+                if (feof($input)) {
+                    if ($this->input instanceof \Iterator) {
+                        $this->input->next();
+                    } else {
+                        $this->input = null;
+                    }
+                }
+            }
+        }
+
+        // no input to read on resource, buffer is empty
+        if (!isset($this->inputBuffer[0]) && !($this->input instanceof \Iterator ? $this->input->valid() : $this->input)) {
+            $this->input = null;
+            fclose($this->pipes[0]);
+            unset($this->pipes[0]);
+        } elseif (!$w) {
+            return [$this->pipes[0]];
+        }
+
+        return null;
+    }
+
+    /**
+     * @internal
+     */
+    public function handleError(int $type, string $msg)
+    {
+        $this->lastError = $msg;
+    }
+}