linux-kernel - [PATCH 3/9] tools/nolibc: move prctl() to sys/prctl.h

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Message-Id: <20250515-nolibc-sys-v1-3-74f82eea3b59@weissschuh.net>
Date: Thu, 15 May 2025 21:57:49 +0200
From: Thomas Weißschuh <linux@...ssschuh.net>
To: Willy Tarreau <w@....eu>, Shuah Khan <shuah@...nel.org>
Cc: linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org, 
 Thomas Weißschuh <linux@...ssschuh.net>
Subject: [PATCH 3/9] tools/nolibc: move prctl() to sys/prctl.h

This is the location regular userspace expects this definition.

Signed-off-by: Thomas Weißschuh <linux@...ssschuh.net>
---
 tools/include/nolibc/Makefile    |  1 +
 tools/include/nolibc/nolibc.h    |  1 +
 tools/include/nolibc/sys.h       | 21 ---------------------
 tools/include/nolibc/sys/prctl.h | 36 ++++++++++++++++++++++++++++++++++++
 4 files changed, 38 insertions(+), 21 deletions(-)

diff --git a/tools/include/nolibc/Makefile b/tools/include/nolibc/Makefile
index aa14dfddd77deb5442a6be65dee5684b6d218da7..35cfbc84d499b0a57689bdfed95a45023904d256 100644
--- a/tools/include/nolibc/Makefile
+++ b/tools/include/nolibc/Makefile
@@ -52,6 +52,7 @@ all_files := \
 		sys/ioctl.h \
 		sys/mman.h \
 		sys/mount.h \
+		sys/prctl.h \
 		sys/random.h \
 		sys/stat.h \
 		sys/syscall.h \
diff --git a/tools/include/nolibc/nolibc.h b/tools/include/nolibc/nolibc.h
index 690368f8e46c33df37c824429cf89dd0e95bb806..1c159e32a248d46fa4d36a2c35e92eb9da91e9f6 100644
--- a/tools/include/nolibc/nolibc.h
+++ b/tools/include/nolibc/nolibc.h
@@ -100,6 +100,7 @@
 #include "sys/ioctl.h"
 #include "sys/mman.h"
 #include "sys/mount.h"
+#include "sys/prctl.h"
 #include "sys/random.h"
 #include "sys/stat.h"
 #include "sys/syscall.h"
diff --git a/tools/include/nolibc/sys.h b/tools/include/nolibc/sys.h
index e66dd6e760557333353d98da2627b038dffe7f93..a17fe98968a29081661eaf235111482a543f87ba 100644
--- a/tools/include/nolibc/sys.h
+++ b/tools/include/nolibc/sys.h
@@ -23,7 +23,6 @@
 #include <linux/auxvec.h>
 #include <linux/fcntl.h> /* for O_* and AT_* */
 #include <linux/stat.h>  /* for statx() */
-#include <linux/prctl.h>
 #include <linux/resource.h>
 #include <linux/utsname.h>
 
@@ -697,26 +696,6 @@ int pipe(int pipefd[2])
 }
 
 
-/*
- * int prctl(int option, unsigned long arg2, unsigned long arg3,
- *                       unsigned long arg4, unsigned long arg5);
- */
-
-static __attribute__((unused))
-int sys_prctl(int option, unsigned long arg2, unsigned long arg3,
-		          unsigned long arg4, unsigned long arg5)
-{
-	return my_syscall5(__NR_prctl, option, arg2, arg3, arg4, arg5);
-}
-
-static __attribute__((unused))
-int prctl(int option, unsigned long arg2, unsigned long arg3,
-		      unsigned long arg4, unsigned long arg5)
-{
-	return __sysret(sys_prctl(option, arg2, arg3, arg4, arg5));
-}
-
-
 /*
  * int pivot_root(const char *new, const char *old);
  */
diff --git a/tools/include/nolibc/sys/prctl.h b/tools/include/nolibc/sys/prctl.h
new file mode 100644
index 0000000000000000000000000000000000000000..778a6a868823ce496f0f5482a58a31d69afd6d30
--- /dev/null
+++ b/tools/include/nolibc/sys/prctl.h
@@ -0,0 +1,36 @@
+/* SPDX-License-Identifier: LGPL-2.1 OR MIT */
+/*
+ * Prctl definitions for NOLIBC
+ * Copyright (C) 2017-2021 Willy Tarreau <w@....eu>
+ */
+
+/* make sure to include all global symbols */
+#include "nolibc.h"
+
+#ifndef _NOLIBC_SYS_PRCTL_H
+#define _NOLIBC_SYS_PRCTL_H
+
+#include "../sys.h"
+
+#include <linux/prctl.h>
+
+/*
+ * int prctl(int option, unsigned long arg2, unsigned long arg3,
+ *                       unsigned long arg4, unsigned long arg5);
+ */
+
+static __attribute__((unused))
+int sys_prctl(int option, unsigned long arg2, unsigned long arg3,
+			  unsigned long arg4, unsigned long arg5)
+{
+	return my_syscall5(__NR_prctl, option, arg2, arg3, arg4, arg5);
+}
+
+static __attribute__((unused))
+int prctl(int option, unsigned long arg2, unsigned long arg3,
+		      unsigned long arg4, unsigned long arg5)
+{
+	return __sysret(sys_prctl(option, arg2, arg3, arg4, arg5));
+}
+
+#endif /* _NOLIBC_SYS_PRCTL_H */

-- 
2.49.0