--- Libc/Libc-763.13/sys/OSMemoryNotification.c
+++ Libc/Libc-1507.100.9/sys/OSMemoryNotification.c
@@ -21,123 +21,11 @@
  * @APPLE_LICENSE_HEADER_END@
  */
 
-#include <errno.h>
-#include <libkern/OSMemoryNotification.h>
-#include <mach/mach.h>
-#include <notify.h>
-#include <stdlib.h>
-#include <sys/time.h>
+// Legacy symbols preserved for binary compatibility.
 
 const char *kOSMemoryNotificationName = "com.apple.system.memorystatus";
 
-struct _OSMemoryNotification {
-	int token;
-	mach_port_t port;
-};
-
-int
-OSMemoryNotificationCreate(OSMemoryNotificationRef *note)
+int OSMemoryNotificationCurrentLevel(void)
 {
-	OSMemoryNotificationRef ref = malloc(sizeof(struct _OSMemoryNotification));
-
-	if (NULL == ref) {
-		return ENOMEM;
-	}
-	
-	if (NOTIFY_STATUS_OK != notify_register_mach_port(kOSMemoryNotificationName, &ref->port, 0, &ref->token))
-		return ENOMEM;
-
-	*note = ref;
-
-	return 0;
+	return 0; // OSMemoryNotificationLevelNormal
 }
-
-int
-OSMemoryNotificationDestroy(OSMemoryNotificationRef note)
-{
-	if (NOTIFY_STATUS_OK != notify_cancel(note->token))
-		return EINVAL;
-
-	if (KERN_SUCCESS != mach_port_deallocate(mach_task_self(), note->port))
-		return EINVAL;
-
-	free(note);
-
-	return 0;
-}
-		
-int
-OSMemoryNotificationWait(OSMemoryNotificationRef note, OSMemoryNotificationLevel *level)
-{
-
-	return OSMemoryNotificationTimedWait(note, level, NULL);
-}
-
-static mach_msg_timeout_t
-abs_to_timeout(const struct timeval *abstime)
-{
-	struct timeval rel, now;
-
-	gettimeofday(&now, NULL);
-
-	rel.tv_usec = abstime->tv_usec - now.tv_usec;
-	rel.tv_sec = abstime->tv_sec - now.tv_sec;
-	if (rel.tv_usec < 0) {
-		rel.tv_usec += 1000000;
-		rel.tv_sec--;
-	}
-	if (((int)rel.tv_sec < 0) || ((rel.tv_sec == 0) && (rel.tv_usec == 0))) {
-		return 0;
-	}
-	return rel.tv_sec * 1000 + rel.tv_usec / 1000;
-}
-
-int
-OSMemoryNotificationTimedWait(OSMemoryNotificationRef note, OSMemoryNotificationLevel *level, const struct timeval *abstime)
-{
-	mach_msg_empty_rcv_t msg = {{0}};
-	mach_msg_return_t ret;
-	uint64_t val;
-
-	if (abstime) {
-		mach_msg_timeout_t timeout = abs_to_timeout(abstime);
-
-		if (0 == timeout)
-			return ETIMEDOUT;
-
-		ret = mach_msg(&msg.header, MACH_RCV_MSG | MACH_RCV_TIMEOUT, 0, sizeof msg, note->port, timeout, MACH_PORT_NULL);
-
-		if (MACH_RCV_TIMED_OUT == ret) {
-			return ETIMEDOUT;
-		} 
-	} else {
-		ret = mach_msg(&msg.header, MACH_RCV_MSG, 0, sizeof msg, note->port, MACH_MSG_TIMEOUT_NONE, MACH_PORT_NULL);
-	}
-
-	if (MACH_MSG_SUCCESS != ret)
-		return EINVAL;
-
-	if (NOTIFY_STATUS_OK != notify_get_state(note->token, &val))
-		return EINVAL;
-
-	*level = (OSMemoryNotificationLevel)val;
-
-	return 0;
-}
-
-OSMemoryNotificationLevel OSMemoryNotificationCurrentLevel(void)
-{
-	uint64_t val;
-	int token;
-
-	if (NOTIFY_STATUS_OK != notify_register_check(kOSMemoryNotificationName, &token))
-		return OSMemoryNotificationLevelAny;
-
-	if (NOTIFY_STATUS_OK != notify_get_state(token, &val))
-		return OSMemoryNotificationLevelAny;
-
-	if (NOTIFY_STATUS_OK != notify_cancel(token))
-		return OSMemoryNotificationLevelAny;
-
-	return (OSMemoryNotificationLevel)val;
-}