From: Yu Watanabe <watanabe.yu+github@gmail.com>
Date: Mon, 9 Jun 2025 04:00:37 +0000 (+0900)
Subject: musl: meson: check existence of renameat2()
X-Git-Tag: v259-rc1~84^2~1
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=17e343b58b862306454b64cd66a26588420cffd3;p=thirdparty%2Fsystemd.git

musl: meson: check existence of renameat2()

musl-1.2.5 does not provide renameat2(). Note, it is added by
https://github.com/kraj/musl/commit/05ce67fea99ca09cd4b6625cff7aec9cc222dd5a,
hence hopefully it will be provided by musl-1.2.6 or newer.
---

diff --git a/meson.build b/meson.build
index 6d576b4d204..a7c7a0a8109 100644
--- a/meson.build
+++ b/meson.build
@@ -579,6 +579,7 @@ assert(long_max > 100000)
 conf.set_quoted('LONG_MAX_STR', f'@long_max@')
 
 foreach ident : [
+        ['renameat2',         '''#include <stdio.h>'''],        # since musl-1.2.6
         ['set_mempolicy',     '''#include <sys/syscall.h>'''],  # declared at numaif.h provided by libnuma, which we do not use
         ['get_mempolicy',     '''#include <sys/syscall.h>'''],  # declared at numaif.h provided by libnuma, which we do not use
         ['strerrorname_np',   '''#include <string.h>'''],       # since glibc-2.32
diff --git a/src/include/musl/stdio.h b/src/include/musl/stdio.h
new file mode 100644
index 00000000000..d677201f457
--- /dev/null
+++ b/src/include/musl/stdio.h
@@ -0,0 +1,13 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+#pragma once
+
+#include_next <stdio.h>
+
+#if !HAVE_RENAMEAT2
+#  define RENAME_NOREPLACE (1 << 0)
+#  define RENAME_EXCHANGE  (1 << 1)
+#  define RENAME_WHITEOUT  (1 << 2)
+
+int missing_renameat2(int __oldfd, const char *__old, int __newfd, const char *__new, unsigned __flags);
+#  define renameat2 missing_renameat2
+#endif
diff --git a/src/libc/musl/meson.build b/src/libc/musl/meson.build
index a876230c67f..8d06d919ef9 100644
--- a/src/libc/musl/meson.build
+++ b/src/libc/musl/meson.build
@@ -3,3 +3,7 @@
 if get_option('libc') != 'musl'
         subdir_done()
 endif
+
+libc_wrapper_sources += files(
+        'stdio.c',
+)
diff --git a/src/libc/musl/stdio.c b/src/libc/musl/stdio.c
new file mode 100644
index 00000000000..102a22cd5cd
--- /dev/null
+++ b/src/libc/musl/stdio.c
@@ -0,0 +1,11 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <stdio.h>
+#include <sys/syscall.h>
+#include <unistd.h>
+
+#if !HAVE_RENAMEAT2
+int missing_renameat2(int __oldfd, const char *__old, int __newfd, const char *__new, unsigned __flags) {
+        return syscall(__NR_renameat2, __oldfd, __old, __newfd, __new, __flags);
+}
+#endif