mDNSMacOSX/safe_vproc.c

   1 /* -*- Mode: C; tab-width: 4 -*-
   2  *
   3  * Copyright (c) 2009 Apple Inc. All rights reserved.
   4  *
   5  * Licensed under the Apache License, Version 2.0 (the "License");
   6  * you may not use this file except in compliance with the License.
   7  * You may obtain a copy of the License at
   8  *
   9  *     http://www.apache.org/licenses/LICENSE-2.0
  10  *
  11  * Unless required by applicable law or agreed to in writing, software
  12  * distributed under the License is distributed on an "AS IS" BASIS,
  13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14  * See the License for the specific language governing permissions and
  15  * limitations under the License.
  16  */
  17
  18 #include <stdlib.h>
  19 #include <assert.h>
  20 #include <vproc.h>
  21 #include "safe_vproc.h"
  22 #include "mDNSDebug.h"
  23 #include <TargetConditionals.h>
  24
  25 #if defined(VPROC_HAS_TRANSACTIONS) && !TARGET_OS_EMBEDDED
  26
  27 static vproc_transaction_t transaction = NULL;
  28
  29 void safe_vproc_transaction_begin(void)
  30         {
  31         if (vproc_transaction_begin)
  32                 {
  33                 if (transaction) { LogMsg("safe_vproc_transaction_begin: Already have a transaction"); }
  34                 else transaction = vproc_transaction_begin(NULL);
  35                 }
  36         }
  37
  38 void safe_vproc_transaction_end(void)
  39         {
  40         if (vproc_transaction_end)
  41                 {
  42                 if (transaction) { vproc_transaction_end(NULL, transaction); transaction = NULL; }
  43                 else LogMsg("safe_vproc_transaction_end: No current transaction");
  44                 }
  45         }
  46
  47 #else
  48
  49 #if ! TARGET_OS_EMBEDDED
  50 #include <stdio.h>
  51 #include <CoreFoundation/CFString.h>
  52
  53 CF_EXPORT CFDictionaryRef _CFCopySystemVersionDictionary(void);
  54 CF_EXPORT const CFStringRef _kCFSystemVersionBuildVersionKey;
  55 #define OSXVers_10_6_SnowLeopard 10
  56
  57 void safe_vproc_transaction_begin(void)
  58         {
  59         static int majorversion = 0;
  60         if (!majorversion)
  61                 {
  62                 CFDictionaryRef vers = _CFCopySystemVersionDictionary();
  63                 if (vers)
  64                         {
  65                         char buildver[256];
  66                         CFStringRef cfbuildver = CFDictionaryGetValue(vers, _kCFSystemVersionBuildVersionKey);
  67                         if (cfbuildver && CFStringGetCString(cfbuildver, buildver, sizeof(buildver), kCFStringEncodingUTF8))
  68                                 sscanf(buildver, "%d", &majorversion);
  69                         CFRelease(vers);
  70                         }
  71                 if (!majorversion || majorversion >= OSXVers_10_6_SnowLeopard)
  72                         LogMsg("Compiled without vproc_transaction support");
  73                 }
  74         }
  75
  76 #else
  77
  78 void safe_vproc_transaction_begin(void) { }
  79
  80 #endif
  81
  82 void safe_vproc_transaction_end(void) { }
  83
  84 #endif