curl: Add curl_multi_get_handles() (php#16363)

see https://curl.se/libcurl/c/curl_multi_get_handles.html

Author: TimWolla

NEWS

@@ -5,6 +5,9 @@ PHP                                                                        NEWS
 - COM:
   . Fix property access of PHP objects wrapped in variant. (cmb)
 
+- Curl:
+  . Added curl_multi_get_handles(). (timwolla)
+
 - DOM:
   . Added Dom\Element::$outerHTML. (nielsdos)
 

UPGRADING

@@ -78,6 +78,11 @@ PHP 8.5 UPGRADE NOTES
 6. New Functions
 ========================================
 
+- Curl:
+  . curl_multi_get_handles() allows retrieving all CurlHandles current
+    attached to a CurlMultiHandle. This includes both handles added using
+    curl_multi_add_handle() and handles accepted by CURLMOPT_PUSHFUNCTION.
+
 - PGSQL:
   . pg_close_stmt offers an alternative way to close a prepared
     statement from the DEALLOCATE sql command in that we can reuse

ext/curl/curl.stub.php

@@ -3702,6 +3702,8 @@ function curl_upkeep(CurlHandle $handle): bool {}
 
 function curl_multi_add_handle(CurlMultiHandle $multi_handle, CurlHandle $handle): int {}
 
+function curl_multi_get_handles(CurlMultiHandle $multi_handle): array {}
+
 function curl_multi_close(CurlMultiHandle $multi_handle): void {}
 
 function curl_multi_errno(CurlMultiHandle $multi_handle): int {}

ext/curl/curl_arginfo.h

@@ -174,6 +174,29 @@ PHP_FUNCTION(curl_multi_remove_handle)
 }
 /* }}} */
 
+PHP_FUNCTION(curl_multi_get_handles)
+{
+	zval      *z_mh;
+	php_curlm *mh;
+
+	ZEND_PARSE_PARAMETERS_START(1, 1)
+		Z_PARAM_OBJECT_OF_CLASS(z_mh, curl_multi_ce)
+	ZEND_PARSE_PARAMETERS_END();
+
+	mh = Z_CURL_MULTI_P(z_mh);
+
+	array_init(return_value);
+	zend_llist_position pos;
+	zval	*pz_ch;
+
+	for (pz_ch = (zval *)zend_llist_get_first_ex(&mh->easyh, &pos); pz_ch;
+		pz_ch = (zval *)zend_llist_get_next_ex(&mh->easyh, &pos)) {
+
+		Z_TRY_ADDREF_P(pz_ch);
+		add_next_index_zval(return_value, pz_ch);
+	}
+}
+
 /* {{{ Get all the sockets associated with the cURL extension, which can then be "selected" */
 PHP_FUNCTION(curl_multi_select)
 {

ext/curl/multi.c

@@ -0,0 +1,71 @@
+--TEST--
+array curl_multi_get_handles ( CurlMultiHandle $mh );
+--EXTENSIONS--
+curl
+--FILE--
+<?php
+$urls = array(
+    "file://".__DIR__."/curl_testdata1.txt",
+    "file://".__DIR__."/curl_testdata2.txt",
+);
+
+$mh = curl_multi_init();
+$map = new WeakMap();
+
+foreach ($urls as $url) {
+    echo "Initializing {$url}.", PHP_EOL;
+    $ch = curl_init($url);
+    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
+    curl_multi_add_handle($mh, $ch);
+    printf("%d handles are attached\n", count(curl_multi_get_handles($mh)));
+    $map[$ch] = $url;
+}
+
+do {
+    $status = curl_multi_exec($mh, $active);
+    if ($status !== CURLM_OK) {
+        throw new \Exception(curl_multi_strerror(curl_multi_errno($mh)));
+    }
+
+    if ($active) {
+        $activity = curl_multi_select($mh);
+        if ($activity === -1) {
+            throw new \Exception(curl_multi_strerror(curl_multi_errno($mh)));
+        }
+    }
+
+    while (($info = curl_multi_info_read($mh)) !== false) {
+        if ($info['msg'] === CURLMSG_DONE) {
+            $handle = $info['handle'];
+            $url = $map[$handle];
+            echo "Request to {$url} finished.", PHP_EOL;
+            printf("%d handles are attached\n", count(curl_multi_get_handles($mh)));
+            curl_multi_remove_handle($mh, $handle);
+            printf("%d handles are attached\n", count(curl_multi_get_handles($mh)));
+
+            if ($info['result'] === CURLE_OK) {
+                echo "Success.", PHP_EOL;
+            } else {
+                echo "Failure.", PHP_EOL;
+            }
+        }
+    }
+} while ($active);
+
+printf("%d handles are attached\n", count(curl_multi_get_handles($mh)));
+
+?>
+--EXPECTF--
+Initializing %scurl_testdata1.txt.
+1 handles are attached
+Initializing %scurl_testdata2.txt.
+2 handles are attached
+Request to %scurl_testdata%d.txt finished.
+2 handles are attached
+1 handles are attached
+Success.
+Request to %scurl_testdata%d.txt finished.
+1 handles are attached
+0 handles are attached
+Success.
+0 handles are attached