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     Change History (most recent first):
  18
  19 $Log: safe_vproc.c,v $
  20 Revision 1.3  2009/02/14 00:09:53  cheshire
  21 Only log "Compiled without vproc_transaction support" when running on a system
  22 where we expect that to be available -- if running on a system that doesn't even
  23 have vproc_transaction, then it doesn't matter that the code was compiled without it.
  24
  25 Revision 1.2  2009/02/09 21:16:17  mcguire
  26 <rdar://problem/5858533> Adopt vproc_transaction API in mDNSResponder
  27 additional cleanup: don't alloc memory since we currently only expect to have one transaction
  28
  29 Revision 1.1  2009/02/06 03:06:49  mcguire
  30 <rdar://problem/5858533> Adopt vproc_transaction API in mDNSResponder
  31
  32  */
  33
  34 #include <stdlib.h>
  35 #include <assert.h>
  36 #include <vproc.h>
  37 #include "safe_vproc.h"
  38 #include "mDNSDebug.h"
  39
  40 #ifdef VPROC_HAS_TRANSACTIONS
  41
  42 static vproc_transaction_t transaction = NULL;
  43
  44 void safe_vproc_transaction_begin(void)
  45         {
  46         if (vproc_transaction_begin)
  47                 {
  48                 if (transaction) { LogMsg("safe_vproc_transaction_begin: Already have a transaction"); }
  49                 else transaction = vproc_transaction_begin(NULL);
  50                 }
  51         }
  52
  53 void safe_vproc_transaction_end(void)
  54         {
  55         if (vproc_transaction_end)
  56                 {
  57                 if (transaction) { vproc_transaction_end(NULL, transaction); transaction = NULL; }
  58                 else LogMsg("safe_vproc_transaction_end: No current transaction");
  59                 }
  60         }
  61
  62 #else
  63
  64 #include <stdio.h>
  65 #include <CoreFoundation/CFString.h>
  66
  67 CF_EXPORT CFDictionaryRef _CFCopySystemVersionDictionary(void);
  68 CF_EXPORT const CFStringRef _kCFSystemVersionBuildVersionKey;
  69 #define OSXVers_10_6_SnowLeopard 10
  70
  71 void safe_vproc_transaction_begin(void)
  72         {
  73         static int majorversion = 0;
  74         if (!majorversion)
  75                 {
  76                 CFDictionaryRef vers = _CFCopySystemVersionDictionary();
  77                 if (vers)
  78                         {
  79                         char buildver[256];
  80                         CFStringRef cfbuildver = CFDictionaryGetValue(vers, _kCFSystemVersionBuildVersionKey);
  81                         if (cfbuildver && CFStringGetCString(cfbuildver, buildver, sizeof(buildver), kCFStringEncodingUTF8))
  82                                 sscanf(buildver, "%d", &majorversion);
  83                         CFRelease(vers);
  84                         }
  85                 if (!majorversion || majorversion >= OSXVers_10_6_SnowLeopard)
  86                         LogMsg("Compiled without vproc_transaction support");
  87                 }
  88         }
  89
  90 void safe_vproc_transaction_end(void) { }
  91
  92 #endif