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Message-Id: <20240423234355.2414567-1-Tony.Ambardar@gmail.com>
Date: Tue, 23 Apr 2024 16:43:55 -0700
From: Tony Ambardar <tony.ambardar@...il.com>
To: musl@...ts.openwall.com
Cc: Tony Ambardar <Tony.Ambardar@...il.com>
Subject: [PATCH v2] add renameat2 linux syscall wrapper
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@...il.com>
---
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 | 12 ++++++++++++
2 files changed, 19 insertions(+)
create mode 100644 src/linux/renameat2.c
diff --git a/include/stdio.h b/include/stdio.h
index cb858618..4ea4c170 100644
--- 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)
diff --git a/src/linux/renameat2.c b/src/linux/renameat2.c
new file mode 100644
index 00000000..48ee8d53
--- /dev/null
+++ b/src/linux/renameat2.c
@@ -0,0 +1,12 @@
+#define _GNU_SOURCE
+#include <stdio.h>
+#include "syscall.h"
+
+int renameat2(int oldfd, const char *old, int newfd, const char *new, unsigned flags)
+{
+ int r = __syscall(SYS_renameat2, oldfd, old, newfd, new, flags);
+#ifdef SYS_renameat
+ if (r==-ENOSYS && !flags) r = __syscall(SYS_renameat, oldfd, old, newfd, new);
+#endif
+ return __syscall_ret(r);
+}
--
2.34.1
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