From 801f020b5f3d6159826ca38f63cd55e5536b35dd Mon Sep 17 00:00:00 2001
From: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Date: Mon, 28 Apr 2025 14:40:06 +0200
Subject: tools/nolibc: add getrandom()
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This is used in various selftests and will be handy when integrating
those with nolibc.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250428-nolibc-misc-v2-5-3c043eeab06c@linutronix.de
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
---
 tools/include/nolibc/Makefile     |  1 +
 tools/include/nolibc/nolibc.h     |  1 +
 tools/include/nolibc/sys/random.h | 34 ++++++++++++++++++++++++++++++++++
 3 files changed, 36 insertions(+)
 create mode 100644 tools/include/nolibc/sys/random.h

(limited to 'tools/include/nolibc')

diff --git a/tools/include/nolibc/Makefile b/tools/include/nolibc/Makefile
index dda881d934d6..45beeecad52d 100644
--- a/tools/include/nolibc/Makefile
+++ b/tools/include/nolibc/Makefile
@@ -48,6 +48,7 @@ all_files := \
 		sys.h \
 		sys/auxv.h \
 		sys/mman.h \
+		sys/random.h \
 		sys/stat.h \
 		sys/syscall.h \
 		sys/time.h \
diff --git a/tools/include/nolibc/nolibc.h b/tools/include/nolibc/nolibc.h
index 05a4bd5fba8b..1d2f391ca4d0 100644
--- a/tools/include/nolibc/nolibc.h
+++ b/tools/include/nolibc/nolibc.h
@@ -98,6 +98,7 @@
 #include "sys.h"
 #include "sys/auxv.h"
 #include "sys/mman.h"
+#include "sys/random.h"
 #include "sys/stat.h"
 #include "sys/syscall.h"
 #include "sys/time.h"
diff --git a/tools/include/nolibc/sys/random.h b/tools/include/nolibc/sys/random.h
new file mode 100644
index 000000000000..8d9749f1c845
--- /dev/null
+++ b/tools/include/nolibc/sys/random.h
@@ -0,0 +1,34 @@
+/* SPDX-License-Identifier: LGPL-2.1 OR MIT */
+/*
+ * random definitions for NOLIBC
+ * Copyright (C) 2025 Thomas Weißschuh <thomas.weissschuh@linutronix.de>
+ */
+
+/* make sure to include all global symbols */
+#include "../nolibc.h"
+
+#ifndef _NOLIBC_SYS_RANDOM_H
+#define _NOLIBC_SYS_RANDOM_H
+
+#include "../arch.h"
+#include "../sys.h"
+
+#include <linux/random.h>
+
+/*
+ * ssize_t getrandom(void *buf, size_t buflen, unsigned int flags);
+ */
+
+static __attribute__((unused))
+ssize_t sys_getrandom(void *buf, size_t buflen, unsigned int flags)
+{
+       return my_syscall3(__NR_getrandom, buf, buflen, flags);
+}
+
+static __attribute__((unused))
+ssize_t getrandom(void *buf, size_t buflen, unsigned int flags)
+{
+       return __sysret(sys_getrandom(buf, buflen, flags));
+}
+
+#endif /* _NOLIBC_SYS_RANDOM_H */
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