fix cgroup v1 vs v2

Author: realFlowControl

ext/standard/tests/file/file_get_contents_file_put_contents_5gb.phpt

@@ -9,36 +9,36 @@ if (PHP_INT_SIZE < 5) {
 if (getenv('SKIP_SLOW_TESTS')) {
     die('skip slow test');
 }
-function get_system_memory(): int|float|false
+function has_enough_memory(int $bytes): bool
 {
     if (strtoupper(substr(PHP_OS, 0, 3)) === 'WIN') {
         // Windows-based memory check
         @exec('wmic OS get FreePhysicalMemory', $output);
         if (isset($output[1])) {
-            return ((int)trim($output[1])) * 1024;
+            return (((int)trim($output[1])) * 1024) >= $bytes;
         }
     } else {
-        // check if running in docker
-        $cgroups = @file_get_contents("/proc/self/cgroup");
-        if ($cgroups && str_contains($cgroups, "docker")) {
-            $limit = @file_get_contents('/sys/fs/cgroup/memory/memory.limit_in_bytes');
-            if ($limit) {
-                return (int) $limit;
-            }
-        } else {
-            // Unix/Linux-based memory check
-            $memInfo = @file_get_contents("/proc/meminfo");
-            if ($memInfo) {
-                preg_match('/MemFree:\s+(\d+) kB/', $memInfo, $matches);
-                return $matches[1] * 1024; // Convert to bytes
-            }
+        // cgroup v1
+        $limit = @file_get_contents('/sys/fs/cgroup/memory/memory.limit_in_bytes');
+        if ($limit && (int)$limit < $bytes) {
+            return false;
+        }
+        // cgroup v2
+        $limit = @file_get_contents('/sys/fs/cgroup/memory.max');
+        if ($limit && !str_contains($limit, 'max') && (int)$limit < $bytes) {
+            return false;
+        }
+        // Unix/Linux-based memory check
+        $memInfo = @file_get_contents("/proc/meminfo");
+        if ($memInfo) {
+            preg_match('/MemFree:\s+(\d+) kB/', $memInfo, $matches);
+            return ($matches[1] * 1024) >= $bytes; // Convert to bytes
         }
     }
     return false;
 }
-$memAvail = get_system_memory();
-if ($memAvail < 10 * 1024 * 1024 * 1024) {
-    die('skip Reason: Insufficient RAM (should be 10GB, is '.$memAvail.' bytes)');
+if(has_enough_memory(10 * 1024 * 1024 * 1024)) { // 10GB
+    die('skip Reason: Insufficient RAM (should be 10GB)');
 }
 $tmpfile = sys_get_temp_dir() . DIRECTORY_SEPARATOR . "file_get_contents_file_put_contents_5gb.bin";
 $tmpfileh = fopen($tmpfile, "wb");