From 970f8a17c9c86eff390252e13bb9a08a3fb5a098 Mon Sep 17 00:00:00 2001
From: Brahmajit Das <listout@listout.xyz>
Date: Tue, 1 Jul 2025 02:02:48 +0530
Subject: [PATCH] samples/landlock: Fix building on musl libc
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Building with make allyesconfig on musl results in the following

In file included from samples/landlock/sandboxer.c:22:
/usr/include/sys/prctl.h:88:8: error: redefinition of 'struct prctl_mm_map'
   88 | struct prctl_mm_map {
      |        ^~~~~~~~~~~~
In file included from samples/landlock/sandboxer.c:16:
usr/include/linux/prctl.h:134:8: note: originally defined here
  134 | struct prctl_mm_map {
      |        ^~~~~~~~~~~~

This is mainly due to difference in the sys/prctl.h between glibc and
musl. The struct prctl_mm_map is defined in sys/prctl.h in musl.

Signed-off-by: Brahmajit Das <listout@listout.xyz>
[mic: Move down the if/include/endif block]
Link: https://lore.kernel.org/r/20250630203248.16273-1-listout@listout.xyz
Signed-off-by: Mickaël Salaün <mic@digikod.net>
---
 samples/landlock/sandboxer.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/samples/landlock/sandboxer.c b/samples/landlock/sandboxer.c
index 4e2854c6f9a3e..e7af02f98208b 100644
--- a/samples/landlock/sandboxer.c
+++ b/samples/landlock/sandboxer.c
@@ -13,7 +13,6 @@
 #include <errno.h>
 #include <fcntl.h>
 #include <linux/landlock.h>
-#include <linux/prctl.h>
 #include <linux/socket.h>
 #include <stddef.h>
 #include <stdio.h>
@@ -25,6 +24,10 @@
 #include <unistd.h>
 #include <stdbool.h>
 
+#if defined(__GLIBC__)
+#include <linux/prctl.h>
+#endif
+
 #ifndef landlock_create_ruleset
 static inline int
 landlock_create_ruleset(const struct landlock_ruleset_attr *const attr,
-- 
2.47.2