From 7113580db23d83cb5420584541f6c743fa68b095 Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Mon, 13 Jun 2022 02:19:51 +0530
Subject: [PATCH] macOS has no waitid

Le Sigh
---
 kitty/prewarm.py | 38 ++++++++++++++++++++++++++------------
 1 file changed, 26 insertions(+), 12 deletions(-)

diff --git a/kitty/prewarm.py b/kitty/prewarm.py
index f7437fcbf..794626291 100644
--- a/kitty/prewarm.py
+++ b/kitty/prewarm.py
@@ -45,18 +45,32 @@ class Child:
     child_process_pid: int
 
 
-def wait_for_child_death(child_pid: int, timeout: float = 1) -> Optional[int]:
-    st = time.monotonic()
-    while time.monotonic() - st < timeout:
-        try:
-            x = os.waitid(os.P_PID, child_pid, os.WEXITED | os.WNOHANG)
-        except ChildProcessError:
-            return 0
-        else:
-            if x is not None and x.si_pid == child_pid:
-                return x.si_status
-        time.sleep(0.01)
-    return None
+if hasattr(os, 'waitid'):
+    def wait_for_child_death(child_pid: int, timeout: float = 1) -> Optional[int]:
+        st = time.monotonic()
+        while time.monotonic() - st < timeout:
+            try:
+                x = os.waitid(os.P_PID, child_pid, os.WEXITED | os.WNOHANG)
+            except ChildProcessError:
+                return 0
+            else:
+                if x is not None and x.si_pid == child_pid:
+                    return x.si_status
+            time.sleep(0.01)
+        return None
+else:
+    def wait_for_child_death(child_pid: int, timeout: float = 1) -> Optional[int]:
+        st = time.monotonic()
+        while time.monotonic() - st < timeout:
+            try:
+                pid, status = os.waitpid(child_pid, os.WNOHANG)
+            except ChildProcessError:
+                return 0
+            else:
+                if pid == child_pid:
+                    return status
+            time.sleep(0.01)
+        return None
 
 
 class PrewarmProcess: