php_params.php

Linux嵌入式设计配套光盘,学习嵌入式设计可参考

<?php

/******************************************************************** 
 * Copyright (c) 2006, Graham P Phillips
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions 
 * are met:
 *
 *   * Redistributions of source code must retain the above copyright 
 *     notice, this list of conditions and the following disclaimer.
 *   * Redistributions in binary form must reproduce the above 
 *     copyright notice, this list of conditions and the following 
 *     disclaimer in the documentation and/or other materials provided 
 *     with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 ********************************************************************/


/* is_php_environment() checks whether this script is running in an in-process 
 * environment (like Apache) or or a CGI environment.
 */
function is_php_environment() {

  if (array_key_exists('SERVER_SOFTWARE', $_SERVER)) {
    if (strstr($_SERVER['SERVER_SOFTWARE'], "PHP")) {
      return true;
    }
    /* We know that GoAhead does not support PHP */
    if (strstr($_SERVER['SERVER_SOFTWARE'], "GoAhead-Webs")) {
      return false;
    }
    /* Apache and lighttpd define PHP_SELF */
    if (array_key_exists('PHP_SELF', $_SERVER)) {
      return true; 
    }
  }
  return false;
}

/* read_params() provides uniform access to form input parameters.
 * The caller can use this function to retrieve form parameters in 
 * the same way regardless of whether this script is running in a 
 * in-process environment (like Apache) or a CGI environment. 
 */ 
function read_params() {
  $params = array();
  if (is_php_environment()) {
    foreach ($_REQUEST as $name => $value) {
      $params[$name] = $value;
    }
  } else {
    $content_length = -1;
    if (array_key_exists('CONTENT_LENGTH', $_ENV)) {
      /* post requests parameters are found in stdin */
      if (is_numeric($_ENV['CONTENT_LENGTH'])) {
        $content_length = $_ENV['CONTENT_LENGTH']; 
      } 

      if ($content_length > 0) {
        $stdin = fopen('php://stdin', 'r');
        $buffer = fgets($stdin, $content_length);
        parse_str($buffer, $params);
      }
    } 
    /* post requests parameters are set an environment variables */
    foreach ($_ENV as $name => $value) 
      $params[$name] = $value;
  }
  return $params;
}


/* daemon_connect() opens a connection using pg_connect() to the given
 * db_host, db_port and db_user.  The function returns the connection.
 * Error messages are appended to error[].
 */
function daemon_connect($db_host, $db_port, $db_user, &$error) {

  if (!function_exists('pg_connect')) {
    $error[] = "The pg_connect() function is not defined."; 
    $error[] = "This is probably because PHP on the web server was not configured with the --with-pgsql option."; 
    return NULL; 
  }

  /* Suppress Postgres error messages */
  error_reporting(error_reporting() & 0xFFFD);

  $connection = pg_connect($db_host, $db_port, $db_user);
  if (!$connection) {
    $error[] = "Unable to connect to daemon.  Attempted to connect to \"" .
$db_host . "\" on port " . $db_port . "."; 
    return NULL;
  }
  return $connection;
}


/* get_log_count() connects to logmuxd and gets the 'count'
 * field from the NetDest table.  The count is used as an
 * ID or signature to identify the most recent log message
 * available.  Returns a negative number if there is an error.
 */
function get_log_count($host,$port) {

  /* Suppress Postgres error messages */
  error_reporting(error_reporting() & 0xFFFD);

  /* connect to the RTA interface on the logger */
  $connection = pg_connect($host, $port, '');
  if ($connection == "") { 
    return(-1);
  }

  /* Get the count of log messages so far.  This count is the "ID". */
  $command = "SELECT count FROM NetDest WHERE destname = 'default'";
  $result = pg_exec($connection, $command);
  if ($result == "") { 
    pg_close($connection);
    return(-2);
  }
  $nrow = pg_NumRows($result);
  if ($nrow == 1) {
    $log_id = pg_result($result, 0, 0);
    return($log_id);
  }
  else {
    return(-3);
  }
  pg_freeresult($result);
  pg_close($connection);
}

?>