Add a mechanism in zend_test to simulate early return of copy_file_range

Author: nielsdos

ext/zend_test/php_test.h

@@ -53,6 +53,7 @@ ZEND_BEGIN_MODULE_GLOBALS(zend_test)
 	int replace_zend_execute_ex;
 	int register_passes;
 	bool print_stderr_mshutdown;
+	zend_long limit_copy_file_range;
 	zend_test_fiber *active_fiber;
 	zend_long quantity_value;
 	zend_string *str_test;

ext/zend_test/test.c

@@ -650,6 +650,9 @@ PHP_INI_BEGIN()
 	STD_PHP_INI_BOOLEAN("zend_test.replace_zend_execute_ex", "0", PHP_INI_SYSTEM, OnUpdateBool, replace_zend_execute_ex, zend_zend_test_globals, zend_test_globals)
 	STD_PHP_INI_BOOLEAN("zend_test.register_passes", "0", PHP_INI_SYSTEM, OnUpdateBool, register_passes, zend_zend_test_globals, zend_test_globals)
 	STD_PHP_INI_BOOLEAN("zend_test.print_stderr_mshutdown", "0", PHP_INI_SYSTEM, OnUpdateBool, print_stderr_mshutdown, zend_zend_test_globals, zend_test_globals)
+#ifdef HAVE_COPY_FILE_RANGE
+	STD_PHP_INI_ENTRY("zend_test.limit_copy_file_range", "-1", PHP_INI_ALL, OnUpdateLong, limit_copy_file_range, zend_zend_test_globals, zend_test_globals)
+#endif
 	STD_PHP_INI_ENTRY("zend_test.quantity_value", "0", PHP_INI_ALL, OnUpdateLong, quantity_value, zend_zend_test_globals, zend_test_globals)
 	STD_PHP_INI_ENTRY("zend_test.str_test", "", PHP_INI_ALL, OnUpdateStr, str_test, zend_zend_test_globals, zend_test_globals)
 	STD_PHP_INI_ENTRY("zend_test.not_empty_str_test", "val", PHP_INI_ALL, OnUpdateStrNotEmpty, not_empty_str_test, zend_zend_test_globals, zend_test_globals)
@@ -930,3 +933,17 @@ PHP_ZEND_TEST_API void bug_gh9090_void_int_char_var(int i, char *fmt, ...) {
 
     va_end(args);
 }
+
+#ifdef HAVE_COPY_FILE_RANGE
+/**
+ * This function allows us to simulate early return of copy_file_range by setting the limit_copy_file_range ini setting.
+ */
+PHP_ZEND_TEST_API ssize_t copy_file_range(int fd_in, off64_t *off_in, int fd_out, off64_t *off_out, size_t len, unsigned int flags)
+{
+	ssize_t (*original_copy_file_range)(int, off64_t *, int, off64_t *, size_t, unsigned int) = dlsym(RTLD_NEXT, "copy_file_range");
+	if (zend_test_globals.limit_copy_file_range >= Z_L(0)) {
+		len = zend_test_globals.limit_copy_file_range;
+	}
+	return original_copy_file_range(fd_in, off_in, fd_out, off_out, len, flags);
+}
+#endif