From 2454dd0eec2fb5af08b740ece91799184f3ceed9 Mon Sep 17 00:00:00 2001
From: Jeremy Huddleston Sequoia <jeremyhu@apple.com>
Date: Sun, 19 Apr 2026 10:35:49 -0700
Subject: [PATCH] client: Use poll() as fallback when ppoll() is unavailable

On platforms like darwin that lack ppoll(), fall back to poll() with
a millisecond timeout. Since the ppoll() call uses a NULL signal mask,
the behavior is equivalent.

Signed-off-by: Jeremy Huddleston Sequoia <jeremyhu@apple.com>
---
 meson.build          |  1 +
 src/wayland-client.c | 16 ++++++++++++++++
 2 files changed, 17 insertions(+)

diff --git a/meson.build b/meson.build
index 1c5caf3e..15564db6 100644
--- a/meson.build
+++ b/meson.build
@@ -51,6 +51,7 @@ have_funcs = [
 	'getpeereid',
 	'mkostemp',
 	'posix_fallocate',
+	'ppoll',
 	'prctl',
 	'memfd_create',
 	'mremap',
diff --git a/src/wayland-client.c b/src/wayland-client.c
index 50b3b4b2..ee596b08 100644
--- a/src/wayland-client.c
+++ b/src/wayland-client.c
@@ -26,12 +26,15 @@
 
 #define _GNU_SOURCE
 
+#include "../config.h"
+
 #include <stdlib.h>
 #include <stdint.h>
 #include <stddef.h>
 #include <stdio.h>
 #include <stdbool.h>
 #include <errno.h>
+#include <limits.h>
 #include <string.h>
 #include <unistd.h>
 #include <sys/socket.h>
@@ -2055,7 +2058,20 @@ wl_display_poll(struct wl_display *display,
 			timespec_sub_saturate(&result, &deadline, &now);
 			remaining_timeout = &result;
 		}
+#ifdef HAVE_PPOLL
 		ret = ppoll(pfd, 1, remaining_timeout, NULL);
+#else
+		if (remaining_timeout) {
+			long timeout_ms =
+				remaining_timeout->tv_sec * 1000 +
+				(remaining_timeout->tv_nsec + 999999) / 1000000;
+			if (timeout_ms > INT_MAX)
+				timeout_ms = INT_MAX;
+			ret = poll(pfd, 1, (int)timeout_ms);
+		} else {
+			ret = poll(pfd, 1, -1);
+		}
+#endif
 	} while (ret == -1 && errno == EINTR);
 
 	return ret;