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    inotify_init

    (PECL inotify >= 0.1.2)

    inotify_init — Initialize an inotify instance

    Descrição

    inotify_init(): resource|false

    Initialize an inotify instance for use with inotify_add_watch()

    Parâmetros

    Esta função não possui parâmetros.

    Valor Retornado

    A stream resource or false on error.

    Exemplos

    Exemplo #1 Example usage of inotify

    <?php
    // Open an inotify instance
    $fd = inotify_init();

    // Watch __FILE__ for metadata changes (e.g. mtime)
    $watch_descriptor = inotify_add_watch($fd, __FILE__, IN_ATTRIB);

    // generate an event
    touch(__FILE__);

    // Read events
    $events = inotify_read($fd);
    print_r($events);

    // The following methods allows to use inotify functions without blocking on inotify_read():

    // - Using stream_select() on $fd:
    $read = array($fd);
    $write = null;
    $except = null;
    stream_select($read,$write,$except,0);

    // - Using stream_set_blocking() on $fd
    stream_set_blocking($fd, 0);
    inotify_read($fd); // Does no block, and return false if no events are pending

    // - Using inotify_queue_len() to check if event queue is not empty
    $queue_len = inotify_queue_len($fd); // If > 0, inotify_read() will not block

    // Stop watching __FILE__ for metadata changes
    inotify_rm_watch($fd, $watch_descriptor);

    // Close the inotify instance
    // This may have closed all watches if this was not already done
    fclose($fd);

    ?>

    O exemplo acima produzirá algo semelhante a:

    array(
  array(
    'wd' => 1,     // Equals $watch_descriptor
    'mask' => 4,   // IN_ATTRIB bit is set
    'cookie' => 0, // unique id to connect related events (e.g. 
                   // IN_MOVE_FROM and IN_MOVE_TO events)
    'name' => '',  // the name of a file (e.g. if we monitored changes
                   // in a directory)
  ),
);

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    User Contributed Notes 1 note

    up
    9
    david dot schueler at tel-billig dot de
    14 years ago
    Example for tailing a file (like tail -f) using inotify.
    <?php
    /**
    * Tail a file (UNIX only!)
    * Watch a file for changes using inotify and return the changed data
    *
    * @param string $file - filename of the file to be watched
    * @param integer $pos - actual position in the file
    * @return string
    */
    function tail($file,&$pos) {
            // get the size of the file
            if(!$pos) $pos = filesize($file);
            // Open an inotify instance
            $fd = inotify_init();
            // Watch $file for changes.
            $watch_descriptor = inotify_add_watch($fd, $file, IN_ALL_EVENTS);
            // Loop forever (breaks are below)
            while (true) {
                // Read events (inotify_read is blocking!)
                $events = inotify_read($fd);
                // Loop though the events which occured
                foreach ($events as $event=>$evdetails) {
                    // React on the event type
                    switch (true) {
                        // File was modified
                        case ($evdetails['mask'] & IN_MODIFY):
                            // Stop watching $file for changes
                            inotify_rm_watch($fd, $watch_descriptor);
                            // Close the inotify instance
                            fclose($fd);
                            // open the file
                            $fp = fopen($file,'r');
                        if (!    $fp) return false;
                            // seek to the last EOF position
                            fseek($fp,$pos);
                            // read until EOF
                            while (!feof($fp)) {
                                $buf .= fread($fp,8192);
                        }
                            // save the new EOF to $pos
                            $pos = ftell($fp); // (remember: $pos is called by reference)
                        // close the file pointer
                            fclose($fp);
                            // return the new data and leave the function
                            return $buf;
                            // be a nice guy and program good code ;-)
                            break;

                            // File was moved or deleted
                        case ($evdetails['mask'] & IN_MOVE):
                    case (    $evdetails['mask'] & IN_MOVE_SELF):
                    case (    $evdetails['mask'] & IN_DELETE):
                    case (    $evdetails['mask'] & IN_DELETE_SELF):
                            // Stop watching $file for changes
                            inotify_rm_watch($fd, $watch_descriptor);
                            // Close the inotify instance
                            fclose($fd);
                            // Return a failure
                            return false;
                        break;
                }
            }
        }
    }

    // Use it like that:
    $lastpos = 0;
    while (    true) {
        echo     tail($file,$lastpos);
    }
    ?>
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