keychain/SigninMetrics/OctagonSignPosts.m

   1 /*
   2  * Copyright (c) 2019 Apple Inc. All Rights Reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23
  24 #import <Foundation/Foundation.h>
  25 #import <mach/mach_time.h>
  26
  27 #import "OctagonSignPosts.h"
  28
  29 os_log_t _OctagonSignpostLogSystem(void) {
  30     static os_log_t log = nil;
  31     static dispatch_once_t onceToken;
  32     dispatch_once(&onceToken, ^{
  33         log = os_log_create("com.apple.security", "signpost");
  34     });
  35     return log;
  36 }
  37
  38 #pragma mark - Signpost Methods
  39
  40 OctagonSignpost _OctagonSignpostCreate(os_log_t subsystem) {
  41     os_signpost_id_t identifier = os_signpost_id_generate(subsystem);
  42     uint64_t timestamp = mach_continuous_time();
  43     return (OctagonSignpost){
  44         .identifier = identifier,
  45         .timestamp = timestamp,
  46     };
  47 }
  48
  49 uint64_t _OctagonSignpostGetNanoseconds(OctagonSignpost signpost) {
  50     static struct mach_timebase_info timebase_info;
  51     static dispatch_once_t onceToken;
  52     dispatch_once(&onceToken, ^{
  53         mach_timebase_info(&timebase_info);
  54     });
  55
  56     uint64_t interval = mach_continuous_time() - signpost.timestamp;
  57
  58     return (uint64_t)(interval *
  59                       ((double)timebase_info.numer / timebase_info.denom));
  60 }