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[yaffs-website] / vendor / symfony / process / Pipes / WindowsPipes.php
1 <?php
2
3 /*
4  * This file is part of the Symfony package.
5  *
6  * (c) Fabien Potencier <fabien@symfony.com>
7  *
8  * For the full copyright and license information, please view the LICENSE
9  * file that was distributed with this source code.
10  */
11
12 namespace Symfony\Component\Process\Pipes;
13
14 use Symfony\Component\Process\Process;
15 use Symfony\Component\Process\Exception\RuntimeException;
16
17 /**
18  * WindowsPipes implementation uses temporary files as handles.
19  *
20  * @see https://bugs.php.net/bug.php?id=51800
21  * @see https://bugs.php.net/bug.php?id=65650
22  *
23  * @author Romain Neutron <imprec@gmail.com>
24  *
25  * @internal
26  */
27 class WindowsPipes extends AbstractPipes
28 {
29     /** @var array */
30     private $files = array();
31     /** @var array */
32     private $fileHandles = array();
33     /** @var array */
34     private $readBytes = array(
35         Process::STDOUT => 0,
36         Process::STDERR => 0,
37     );
38     /** @var bool */
39     private $haveReadSupport;
40
41     public function __construct($input, $haveReadSupport)
42     {
43         $this->haveReadSupport = (bool) $haveReadSupport;
44
45         if ($this->haveReadSupport) {
46             // Fix for PHP bug #51800: reading from STDOUT pipe hangs forever on Windows if the output is too big.
47             // Workaround for this problem is to use temporary files instead of pipes on Windows platform.
48             //
49             // @see https://bugs.php.net/bug.php?id=51800
50             $pipes = array(
51                 Process::STDOUT => Process::OUT,
52                 Process::STDERR => Process::ERR,
53             );
54             $tmpCheck = false;
55             $tmpDir = sys_get_temp_dir();
56             $lastError = 'unknown reason';
57             set_error_handler(function ($type, $msg) use (&$lastError) { $lastError = $msg; });
58             for ($i = 0;; ++$i) {
59                 foreach ($pipes as $pipe => $name) {
60                     $file = sprintf('%s\\sf_proc_%02X.%s', $tmpDir, $i, $name);
61                     if (file_exists($file) && !unlink($file)) {
62                         continue 2;
63                     }
64                     $h = fopen($file, 'xb');
65                     if (!$h) {
66                         $error = $lastError;
67                         if ($tmpCheck || $tmpCheck = unlink(tempnam(false, 'sf_check_'))) {
68                             continue;
69                         }
70                         restore_error_handler();
71                         throw new RuntimeException(sprintf('A temporary file could not be opened to write the process output: %s', $error));
72                     }
73                     if (!$h || !$this->fileHandles[$pipe] = fopen($file, 'rb')) {
74                         continue 2;
75                     }
76                     if (isset($this->files[$pipe])) {
77                         unlink($this->files[$pipe]);
78                     }
79                     $this->files[$pipe] = $file;
80                 }
81                 break;
82             }
83             restore_error_handler();
84         }
85
86         parent::__construct($input);
87     }
88
89     public function __destruct()
90     {
91         $this->close();
92         $this->removeFiles();
93     }
94
95     /**
96      * {@inheritdoc}
97      */
98     public function getDescriptors()
99     {
100         if (!$this->haveReadSupport) {
101             $nullstream = fopen('NUL', 'c');
102
103             return array(
104                 array('pipe', 'r'),
105                 $nullstream,
106                 $nullstream,
107             );
108         }
109
110         // We're not using pipe on Windows platform as it hangs (https://bugs.php.net/bug.php?id=51800)
111         // We're not using file handles as it can produce corrupted output https://bugs.php.net/bug.php?id=65650
112         // So we redirect output within the commandline and pass the nul device to the process
113         return array(
114             array('pipe', 'r'),
115             array('file', 'NUL', 'w'),
116             array('file', 'NUL', 'w'),
117         );
118     }
119
120     /**
121      * {@inheritdoc}
122      */
123     public function getFiles()
124     {
125         return $this->files;
126     }
127
128     /**
129      * {@inheritdoc}
130      */
131     public function readAndWrite($blocking, $close = false)
132     {
133         $this->unblock();
134         $w = $this->write();
135         $read = $r = $e = array();
136
137         if ($blocking) {
138             if ($w) {
139                 @stream_select($r, $w, $e, 0, Process::TIMEOUT_PRECISION * 1E6);
140             } elseif ($this->fileHandles) {
141                 usleep(Process::TIMEOUT_PRECISION * 1E6);
142             }
143         }
144         foreach ($this->fileHandles as $type => $fileHandle) {
145             $data = stream_get_contents($fileHandle, -1, $this->readBytes[$type]);
146
147             if (isset($data[0])) {
148                 $this->readBytes[$type] += strlen($data);
149                 $read[$type] = $data;
150             }
151             if ($close) {
152                 fclose($fileHandle);
153                 unset($this->fileHandles[$type]);
154             }
155         }
156
157         return $read;
158     }
159
160     /**
161      * {@inheritdoc}
162      */
163     public function haveReadSupport()
164     {
165         return $this->haveReadSupport;
166     }
167
168     /**
169      * {@inheritdoc}
170      */
171     public function areOpen()
172     {
173         return $this->pipes && $this->fileHandles;
174     }
175
176     /**
177      * {@inheritdoc}
178      */
179     public function close()
180     {
181         parent::close();
182         foreach ($this->fileHandles as $handle) {
183             fclose($handle);
184         }
185         $this->fileHandles = array();
186     }
187
188     /**
189      * Removes temporary files.
190      */
191     private function removeFiles()
192     {
193         foreach ($this->files as $filename) {
194             if (file_exists($filename)) {
195                 @unlink($filename);
196             }
197         }
198         $this->files = array();
199     }
200 }