linux-kernel - [PATCH 2/4] tools/nolibc: add wrapper for memfd

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Message-Id: <20230402184806.12440-3-w@1wt.eu>
Date:   Sun,  2 Apr 2023 20:48:04 +0200
From:   Willy Tarreau <w@....eu>
To:     "Paul E. McKenney" <paulmck@...nel.org>
Cc:     linux@...ssschuh.net, linux-kernel@...r.kernel.org,
        Willy Tarreau <w@....eu>
Subject: [PATCH 2/4] tools/nolibc: add wrapper for memfd_create

From: Thomas Weißschuh <linux@...ssschuh.net>

This is useful for users and will also be used by a future testcase.

Signed-off-by: Thomas Weißschuh <linux@...ssschuh.net>
Signed-off-by: Willy Tarreau <w@....eu>
---
 tools/include/nolibc/sys.h | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/tools/include/nolibc/sys.h b/tools/include/nolibc/sys.h
index 5d624dc63a42..bea9760dbd16 100644
--- a/tools/include/nolibc/sys.h
+++ b/tools/include/nolibc/sys.h
@@ -1365,6 +1365,29 @@ ssize_t write(int fd, const void *buf, size_t count)
 	return ret;
 }
 
+
+/*
+ * int memfd_create(const char *name, unsigned int flags);
+ */
+
+static __attribute__((unused))
+int sys_memfd_create(const char *name, unsigned int flags)
+{
+	return my_syscall2(__NR_memfd_create, name, flags);
+}
+
+static __attribute__((unused))
+int memfd_create(const char *name, unsigned int flags)
+{
+	ssize_t ret = sys_memfd_create(name, flags);
+
+	if (ret < 0) {
+		SET_ERRNO(-ret);
+		ret = -1;
+	}
+	return ret;
+}
+
 /* make sure to include all global symbols */
 #include "nolibc.h"
 
-- 
2.17.5