Initial commit

toolchain/musl/patches/610-add-renameat2-linux-syscall-wrapper.patch

@@ -0,0 +1,61 @@
+From dc651fe2e6b16087c519c0bd0bf943cb7c53c807 Mon Sep 17 00:00:00 2001
+In-Reply-To: <20240423234355.2414567-1-Tony.Ambardar@gmail.com>
+References: <20240423234355.2414567-1-Tony.Ambardar@gmail.com>
+From: Tony Ambardar <Tony.Ambardar@gmail.com>
+Date: Sat, 20 Apr 2024 21:30:13 -0700
+Subject: [PATCH v3] add renameat2 linux syscall wrapper
+To: musl@lists.openwall.com
+Cc: Rich Felker <dalias@libc.org>
+
+This syscall is available since Linux 3.15 and also implemented in glibc
+from version 2.28. It is commonly used in filesystem or security contexts.
+
+Constants RENAME_NOREPLACE, RENAME_EXCHANGE, RENAME_WHITEOUT are guarded by
+_GNU_SOURCE as with glibc.
+
+Signed-off-by: Tony Ambardar <Tony.Ambardar@gmail.com>
+---
+v2 -> v3:
+ * call SYS_renameat first if applicable
+ * drop unneeded error code handling
+
+v1 -> v2:
+ * align related constants
+ * drop 'int' from 'unsigned int'
+ * add fallback to SYS_renameat where applicable
+---
+ include/stdio.h       |  7 +++++++
+ src/linux/renameat2.c | 11 +++++++++++
+ 2 files changed, 18 insertions(+)
+ create mode 100644 src/linux/renameat2.c
+
+--- a/include/stdio.h
++++ b/include/stdio.h
+@@ -158,6 +158,13 @@ char *ctermid(char *);
+ #define L_ctermid 20
+ #endif
+ 
++#if defined(_GNU_SOURCE)
++#define RENAME_NOREPLACE (1 << 0)
++#define RENAME_EXCHANGE  (1 << 1)
++#define RENAME_WHITEOUT  (1 << 2)
++
++int renameat2(int, const char *, int, const char *, unsigned);
++#endif
+ 
+ #if defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) \
+  || defined(_BSD_SOURCE)
+--- /dev/null
++++ b/src/linux/renameat2.c
+@@ -0,0 +1,11 @@
++#define _GNU_SOURCE
++#include <stdio.h>
++#include "syscall.h"
++
++int renameat2(int oldfd, const char *old, int newfd, const char *new, unsigned flags)
++{
++#ifdef SYS_renameat
++	if (!flags) return syscall(SYS_renameat, oldfd, old, newfd, new);
++#endif
++	return syscall(SYS_renameat2, oldfd, old, newfd, new, flags);
++}