<?php
if ($_POST['submit']=="Submit")
{
$arg1 = $_POST["LHS"];
$arg2 = $_POST["RHS"];
if (!empty($arg1) && !empty($arg2))
{
$descriptorspec =array(
0=>array("pipe", "r"), // stdin is a pipe that the child will read from
1=>array("pipe", "w"), // stdout is a pipe that the child will write to
2=>array("file", "/tmp/adder-error.log", "a") // stderr is a file to write to
);
// $result=$arg1+$arg2;
// echo "the answer is ".$result;
$process = proc_open("/var/www/cgi-bin/adder", $descriptorspec, $pipes);
if (is_resource($process))
{
// $pipes now looks like this:
// 0=>writable handle connected to child stdin
// 1=>readable handle connected to child stdout
// Any error will be appended to /tmp.adder-error.log
fwrite($pipes[0], "$arg1 $arg2\n");
fclose($pipes[0]);
// $result = -1;
// fscanf($pipes[1], " %d", $result);
echo "the answer is ". stream_get_contents($pipes[1]);
fclose($pipes[1]);
$return_value = proc_close($process);
}
}
}
?>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title></title>
</head>
<body>
<form action="index.php" method="post">
First argument:
<input type="text" name="LHS" maxlength="50"><br />
Second argument:
<input type="text" name="RHS" maxlength="50"><br />
Press to compute:
<input type="submit" name="submit" value="Submit">
</form>
</body>
</html>
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