From 86ee1fa89d4eb1c9f8b1b4a1a232d42403c451e8 Mon Sep 17 00:00:00 2001
From: Niels Dossche <7771979+nielsdos@users.noreply.github.com>
Date: Wed, 23 Jul 2025 11:32:16 +0200
Subject: [PATCH] Handle broken hrtime in ftp

Part of GH-19210.
---
 ext/ftp/ftp.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/ext/ftp/ftp.c b/ext/ftp/ftp.c
index acdc1522e58fc..3f9a78a81f0f4 100644
--- a/ext/ftp/ftp.c
+++ b/ext/ftp/ftp.c
@@ -1471,7 +1471,8 @@ static int my_poll(php_socket_t fd, int events, int timeout) {
 
 		if (n == -1 && php_socket_errno() == EINTR) {
 			zend_hrtime_t delta_ns = zend_hrtime() - start_ns;
-			if (delta_ns > timeout_hr) {
+			/* delta_ns == 0 is only possible with a platform that does not support a high-res timer. */
+			if (delta_ns > timeout_hr || UNEXPECTED(delta_ns == 0)) {
 #ifndef PHP_WIN32
 				errno = ETIMEDOUT;
 #endif