From 4d00d4f8046972907ef34ac5677d07ae39f3aded Mon Sep 17 00:00:00 2001
From: Jaeyoon Jung <jaeyoon.jung@lge.com>
Date: Sun, 30 Nov 2025 11:51:13 +0900
Subject: [PATCH] build: Check if P_PIDFD is defined

It is defined in enum 'idtype_t' in some environment in which causes an
error like:
../git/src/lxc/process_utils.h:144:17: error: expected identifier before numeric constant
  144 | #define P_PIDFD 3
      |                 ^

Signed-off-by: Jaeyoon Jung <jaeyoon.jung@lge.com>
Upstream-Status: Submitted [https://github.com/lxc/lxc/pull/4614]
---
 meson.build             | 11 +++++++++++
 src/lxc/process_utils.h |  2 +-
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/meson.build b/meson.build
index ec7524c2..4b3a8f07 100644
--- a/meson.build
+++ b/meson.build
@@ -521,6 +521,17 @@ foreach ccattr: [
     srcconf.set10('HAVE_COMPILER_ATTR_' + ccattr.underscorify().to_upper(), cc.has_function_attribute(ccattr))
 endforeach
 
+## P_PIDFD
+test_code = '''
+#include <sys/wait.h>
+void func() { siginfo_t s; int r = waitid(P_PIDFD, 0, &s, 0); }
+'''
+if cc.compiles(test_code, name: 'waitid(P_PIDFD, ...)')
+    srcconf.set('HAVE_P_PIDFD', 1)
+  else
+    srcconf.set('HAVE_P_PIDFD', 0)
+endif
+
 ## Headers.
 foreach ident: [
     ['bpf',               '''#include <sys/syscall.h>
diff --git a/src/lxc/process_utils.h b/src/lxc/process_utils.h
index effff9bd..f4f53a23 100644
--- a/src/lxc/process_utils.h
+++ b/src/lxc/process_utils.h
@@ -139,7 +139,7 @@
 #endif
 
 /* waitid */
-#if !HAVE_SYS_PIDFD_H
+#if !HAVE_P_PIDFD
 #ifndef P_PIDFD
 #define P_PIDFD 3
 #endif
-- 
2.47.2