From 1c7933296b4bf53057c8f3ab4c79635bed225c75 Mon Sep 17 00:00:00 2001
From: Marcel Holtmann <marcel@holtmann.org>
Date: Tue, 10 Feb 2026 09:22:57 +0100
Subject: [PATCH] p2p: Fix build issue with missing _GNU_SOURCE
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  CC       src/p2p.o
src/p2p.c: In function ‘p2p_connection_reset’:
src/p2p.c:643:17: error: implicit declaration of function ‘explicit_bzero’ [-Wimplicit-function-declaration]
  643 |                 explicit_bzero(dev->conn_pin, strlen(dev->conn_pin));
      |                 ^~~~~~~~~~~~~~
src/p2p.c: In function ‘p2p_device_update_from_genl’:
src/p2p.c:4342:23: error: ‘HOST_NAME_MAX’ undeclared (first use in this function); did you mean ‘XATTR_NAME_MAX’?
 4342 |         char hostname[HOST_NAME_MAX + 1];
      |                       ^~~~~~~~~~~~~
      |                       XATTR_NAME_MAX
src/p2p.c:4342:23: note: each undeclared identifier is reported only once for each function it appears in
src/p2p.c:4376:9: error: implicit declaration of function ‘gethostname’; did you mean ‘getsockname’? [-Wimplicit-function-declaration]
 4376 |         gethostname(hostname, sizeof(hostname));
      |         ^~~~~~~~~~~
      |         getsockname
src/p2p.c:4342:14: error: unused variable ‘hostname’ [-Werror=unused-variable]
 4342 |         char hostname[HOST_NAME_MAX + 1];
      |              ^~~~~~~~
---
 src/p2p.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/p2p.c b/src/p2p.c
index 7d89da21..33a4269f 100644
--- a/src/p2p.c
+++ b/src/p2p.c
@@ -24,6 +24,7 @@
 #include <config.h>
 #endif
 
+#define _GNU_SOURCE
 #include <stdlib.h>
 #include <linux/rtnetlink.h>
 #include <linux/if_ether.h>
@@ -35,6 +36,7 @@
 #include <netinet/in.h>
 #include <arpa/inet.h>
 #include <linux/if.h>
+#include <sys/param.h>
 
 #include <ell/ell.h>