From 3b21c18439e40768ea743e2c867115da441350d9 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Martin=20Kr=C3=B6ning?=
 <martin.kroening@eonerc.rwth-aachen.de>
Date: Sat, 21 Jun 2025 11:27:55 +0200
Subject: [PATCH] feat: stub net/if.h

---
 newlib/libc/sys/hermit/Makefile.inc     |  1 +
 newlib/libc/sys/hermit/include/net/if.h | 22 ++++++++++++++++++++++
 newlib/libc/sys/hermit/net_if.c         | 18 ++++++++++++++++++
 3 files changed, 41 insertions(+)
 create mode 100644 newlib/libc/sys/hermit/include/net/if.h
 create mode 100644 newlib/libc/sys/hermit/net_if.c

diff --git a/newlib/libc/sys/hermit/Makefile.inc b/newlib/libc/sys/hermit/Makefile.inc
index 36425fa5b..b2c0e6855 100644
--- a/newlib/libc/sys/hermit/Makefile.inc
+++ b/newlib/libc/sys/hermit/Makefile.inc
@@ -13,6 +13,7 @@ libc_a_SOURCES += \
 	%D%/ioctl.c \
 	%D%/makecontext.c \
 	%D%/mman.c \
+	%D%/net_if.c \
 	%D%/netdb.c \
 	%D%/netinet_in.c \
 	%D%/pwd.c \
diff --git a/newlib/libc/sys/hermit/include/net/if.h b/newlib/libc/sys/hermit/include/net/if.h
new file mode 100644
index 000000000..e339aacba
--- /dev/null
+++ b/newlib/libc/sys/hermit/include/net/if.h
@@ -0,0 +1,22 @@
+#ifndef _NET_IF_H
+#define _NET_IF_H
+
+#include <sys/cdefs.h>
+
+__BEGIN_DECLS
+
+struct if_nameindex {
+    unsigned if_index;
+    char *if_name;
+};
+
+#define IF_NAMESIZE 16
+
+void if_freenameindex(struct if_nameindex *ptr);
+char *if_indextoname(unsigned ifindex, char *ifname);
+struct if_nameindex *if_nameindex(void);
+unsigned if_nametoindex(const char *ifname);
+
+__END_DECLS
+
+#endif /* _NET_IF_H */
diff --git a/newlib/libc/sys/hermit/net_if.c b/newlib/libc/sys/hermit/net_if.c
new file mode 100644
index 000000000..f1ca06950
--- /dev/null
+++ b/newlib/libc/sys/hermit/net_if.c
@@ -0,0 +1,18 @@
+#include <errno.h>
+#include <net/if.h>
+
+void if_freenameindex(struct if_nameindex *ptr) {}
+
+char *if_indextoname(unsigned ifindex, char *ifname) {
+    errno = ENXIO;
+    return NULL;
+}
+
+struct if_nameindex *if_nameindex(void) {
+    errno = ENOSYS;
+    return NULL;
+}
+
+unsigned if_nametoindex(const char *ifname) {
+    return 0;
+}