make ZEND_SIGNALS configurable, off by default

also make ZEND_SIGNALS enabled and disabled binary-compatible

NEWS

@@ -4,6 +4,8 @@ PHP                                                                        NEWS
 - Core:
   . Added ability to reset user opcode handlers (Yoram).
   . Improved max_input_vars directive to check nested variables (Dmitry).
+  . Made ZEND_SIGNALS configurable via --enable-zend-signals, off by
+    default (Stas).
   . Fixed bug #60965 (Buffer overflow on htmlspecialchars/entities with
     $double=false). (Gustavo)
 

Zend/Zend.m4

@@ -393,14 +393,20 @@ int main()
 AC_CHECK_FUNCS(mremap)
 
 
+AC_ARG_ENABLE(zend-signals,
+[  --enable-zend-signals   Use zend signal handling],[
+  ZEND_SIGNALS=$enableval
+],[
+  ZEND_SIGNALS=no
+])  
+
 AC_CHECK_FUNC(sigaction, [
-	ZEND_SIGNALS=yes
-	AC_DEFINE(ZEND_SIGNALS, 1, [Use zend signal handling])
 	AC_DEFINE(HAVE_SIGACTION, 1, [Whether sigaction() is available])
 ], [
 	ZEND_SIGNALS=no
 ])
 if test "$ZEND_SIGNALS" = "yes"; then
+	AC_DEFINE(ZEND_SIGNALS, 1, [Use zend signal handling])
 	CFLAGS="$CFLAGS -DZEND_SIGNALS"
 fi
 

Zend/zend.h

@@ -531,10 +531,8 @@ typedef struct _zend_utility_functions {
 	int (*write_function)(const char *str, uint str_length);
 	FILE *(*fopen_function)(const char *filename, char **opened_path TSRMLS_DC);
 	void (*message_handler)(long message, const void *data TSRMLS_DC);
-#ifndef ZEND_SIGNALS
 	void (*block_interruptions)(void);
 	void (*unblock_interruptions)(void);
-#endif
 	int (*get_configuration_directive)(const char *name, uint name_length, zval *contents);
 	void (*ticks_function)(int ticks);
 	void (*on_timeout)(int seconds TSRMLS_DC);
@@ -677,10 +675,8 @@ BEGIN_EXTERN_C()
 extern ZEND_API int (*zend_printf)(const char *format, ...) ZEND_ATTRIBUTE_PTR_FORMAT(printf, 1, 2);
 extern ZEND_API zend_write_func_t zend_write;
 extern ZEND_API FILE *(*zend_fopen)(const char *filename, char **opened_path TSRMLS_DC);
-#ifndef ZEND_SIGNALS
 extern ZEND_API void (*zend_block_interruptions)(void);
 extern ZEND_API void (*zend_unblock_interruptions)(void);
-#endif
 extern ZEND_API void (*zend_ticks_function)(int ticks);
 extern ZEND_API void (*zend_error_cb)(int type, const char *error_filename, const uint error_lineno, const char *format, va_list args) ZEND_ATTRIBUTE_PTR_FORMAT(printf, 4, 0);
 extern ZEND_API void (*zend_on_timeout)(int seconds TSRMLS_DC);

main/main.c

@@ -1999,10 +1999,8 @@ int php_module_startup(sapi_module_struct *sf, zend_module_entry *additional_mod
 	zuf.write_function = php_output_wrapper;
 	zuf.fopen_function = php_fopen_wrapper_for_zend;
 	zuf.message_handler = php_message_handler_for_zend;
-#ifndef ZEND_SIGNALS
 	zuf.block_interruptions = sapi_module.block_interruptions;
 	zuf.unblock_interruptions = sapi_module.unblock_interruptions;
-#endif
 	zuf.get_configuration_directive = php_get_configuration_directive_for_zend;
 	zuf.ticks_function = php_run_ticks;
 	zuf.on_timeout = php_on_timeout;