From c15fe51918728816f65a78bbaf4090789aea71c4 Mon Sep 17 00:00:00 2001
From: David Carlier <devnexen@gmail.com>
Date: Sun, 2 Oct 2022 12:55:00 +0100
Subject: [PATCH] Fix GH-9653: does not inconditionally support copy_file_range
 on older kernels.

As mentioned in its manpage, it had been reworked in the 5.3 line to support cross filesystem interactions.
Closes #GH-9656
---
 NEWS         |  1 +
 configure.ac | 28 +++++++++++++++++++++++++++-
 2 files changed, 28 insertions(+), 1 deletion(-)

diff --git a/NEWS b/NEWS
index b0a258b71b6..74f520b1490 100644
--- a/NEWS
+++ b/NEWS
@@ -14,6 +14,7 @@ PHP                                                                        NEWS
 - Streams:
   . Fixed bug GH-9590 (stream_select does not abort upon exception or empty
     valid fd set). (Arnaud)
+  . Fixed bug GH-9653 (file copy between different filesystems). (David Carlier)
 
 29 Sep 2022, PHP 8.2.0RC3
 
diff --git a/configure.ac b/configure.ac
index a9c609df2ed..331015490cf 100644
--- a/configure.ac
+++ b/configure.ac
@@ -364,7 +364,6 @@ PHP_CHECK_FUNC(socketpair, socket, network)
 PHP_CHECK_FUNC(htonl, socket, network)
 PHP_CHECK_FUNC(gethostname, nsl, network)
 PHP_CHECK_FUNC(gethostbyaddr, nsl, network)
-PHP_CHECK_FUNC(copy_file_range)
 PHP_CHECK_FUNC(dlopen, dl, root)
 PHP_CHECK_FUNC(dlsym, dl, root)
 if test "$ac_cv_func_dlopen" = "yes"; then
@@ -691,6 +690,33 @@ if test "$ac_cv_func_getaddrinfo" = yes; then
   AC_DEFINE(HAVE_GETADDRINFO,1,[Define if you have the getaddrinfo function])
 fi
 
+AC_CACHE_CHECK([for copy_file_range], ac_cv_copy_file_range,
+[AC_RUN_IFELSE([AC_LANG_SOURCE([[
+#ifdef __linux__
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE
+#endif
+#include <linux/version.h>
+#include <unistd.h>
+
+int main(void) {
+(void)copy_file_range(-1, 0, -1, 0, 0, 0);
+#if LINUX_VERSION_CODE < KERNEL_VERSION(5,3,0)
+#error "kernel too old"
+#else
+return 0;
+#endif
+}
+#else
+#error "unsupported platform"
+#endif
+]])], [ac_cv_copy_file_range=yes], [ac_cv_copy_file_range=no])
+])
+
+if test "$ac_cv_copy_file_range" = yes; then
+  AC_DEFINE(HAVE_COPY_FILE_RANGE,1,[Define if copy_file_range support])
+fi
+
 AC_REPLACE_FUNCS(strlcat strlcpy explicit_bzero getopt)
 AC_FUNC_ALLOCA
 PHP_TIME_R_TYPE