xpcom/base/nsMacUtilsImpl.cpp

   1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* ***** BEGIN LICENSE BLOCK *****
   3  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
   4  *
   5  * The contents of this file are subject to the Mozilla Public License Version
   6  * 1.1 (the "License"); you may not use this file except in compliance with
   7  * the License. You may obtain a copy of the License at
   8  * http://www.mozilla.org/MPL/
   9  *
  10  * Software distributed under the License is distributed on an "AS IS" basis,
  11  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
  12  * for the specific language governing rights and limitations under the
  13  * License.
  14  *
  15  * The Original Code is XPCOM utility functions for Mac OS X
  16  *
  17  * The Initial Developer of the Original Code is Google Inc.
  18  * Portions created by the Initial Developer are Copyright (C) 2006
  19  * the Initial Developer. All Rights Reserved.
  20  *
  21  * Contributor(s):
  22  *  Mark Mentovai <mark@moxienet.com> (Original Author)
  23  *
  24  * Alternatively, the contents of this file may be used under the terms of
  25  * either the GNU General Public License Version 2 or later (the "GPL"), or
  26  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
  27  * in which case the provisions of the GPL or the LGPL are applicable instead
  28  * of those above. If you wish to allow use of your version of this file only
  29  * under the terms of either the GPL or the LGPL, and not to allow others to
  30  * use your version of this file under the terms of the MPL, indicate your
  31  * decision by deleting the provisions above and replace them with the notice
  32  * and other provisions required by the GPL or the LGPL. If you do not delete
  33  * the provisions above, a recipient may use your version of this file under
  34  * the terms of any one of the MPL, the GPL or the LGPL.
  35  *
  36  * ***** END LICENSE BLOCK ***** */
  37
  38 #include "nsMacUtilsImpl.h"
  39
  40 #include <CoreFoundation/CoreFoundation.h>
  41 #include <fcntl.h>
  42 #include <unistd.h>
  43 #include <sys/sysctl.h>
  44 #include <mach-o/fat.h>
  45
  46 NS_IMPL_ISUPPORTS1(nsMacUtilsImpl, nsIMacUtils)
  47
  48 /* readonly attribute boolean isUniversalBinary; */
  49 // True when the main executable is a fat file supporting at least
  50 // ppc and x86 (universal binary).
  51 NS_IMETHODIMP nsMacUtilsImpl::GetIsUniversalBinary(PRBool *aIsUniversalBinary)
  52 {
  53   static PRBool sInitialized = PR_FALSE,
  54                 sIsUniversalBinary = PR_FALSE;
  55
  56   if (sInitialized) {
  57     *aIsUniversalBinary = sIsUniversalBinary;
  58     return NS_OK;
  59   }
  60
  61   PRBool foundPPC = PR_FALSE,
  62          foundX86 = PR_FALSE;
  63   CFURLRef executableURL = nsnull;
  64   int fd = -1;
  65
  66   CFBundleRef mainBundle;
  67   if (!(mainBundle = ::CFBundleGetMainBundle()))
  68     goto done;
  69
  70   if (!(executableURL = ::CFBundleCopyExecutableURL(mainBundle)))
  71     goto done;
  72
  73   char executablePath[PATH_MAX];
  74   if (!::CFURLGetFileSystemRepresentation(executableURL, PR_TRUE,
  75                                           (UInt8*) executablePath,
  76                                           sizeof(executablePath)))
  77     goto done;
  78
  79   if ((fd = open(executablePath, O_RDONLY)) == -1)
  80     goto done;
  81
  82   struct fat_header fatHeader;
  83   if (read(fd, &fatHeader, sizeof(fatHeader)) != sizeof(fatHeader))
  84     goto done;
  85
  86   // The fat header is always stored on disk as big-endian.
  87   fatHeader.magic = CFSwapInt32BigToHost(fatHeader.magic);
  88   fatHeader.nfat_arch = CFSwapInt32BigToHost(fatHeader.nfat_arch);
  89
  90   // Main executable is thin.
  91   if (fatHeader.magic != FAT_MAGIC)
  92     goto done;
  93
  94   // Loop over each architecture in the file.  We're presently only
  95   // interested in 32-bit PPC and x86.
  96   for (PRUint32 i = 0 ; i < fatHeader.nfat_arch ; i++) {
  97     struct fat_arch fatArch;
  98     if (read(fd, &fatArch, sizeof(fatArch)) != sizeof(fatArch))
  99       goto done;
 100
 101     // This is still part of the fat header, so byte-swap as needed.
 102     fatArch.cputype = CFSwapInt32BigToHost(fatArch.cputype);
 103
 104     // Don't mask out the ABI bits.  This allows identification of ppc64
 105     // as distinct from ppc.  CPU_TYPE_X86 is preferred to CPU_TYPE_I386
 106     // but does not exist prior to the 10.4 headers.
 107     if (fatArch.cputype == CPU_TYPE_POWERPC)
 108       foundPPC = PR_TRUE;
 109     else if (fatArch.cputype == CPU_TYPE_I386)
 110       foundX86 = PR_TRUE;
 111   }
 112
 113   if (foundPPC && foundX86)
 114     sIsUniversalBinary = PR_TRUE;
 115
 116 done:
 117   if (fd != -1)
 118     close(fd);
 119   if (executableURL)
 120     ::CFRelease(executableURL);
 121
 122   *aIsUniversalBinary = sIsUniversalBinary;
 123   sInitialized = PR_TRUE;
 124
 125   return NS_OK;
 126 }
 127
 128 /* readonly attribute boolean isTranslated; */
 129 // True when running under binary translation (Rosetta).
 130 NS_IMETHODIMP nsMacUtilsImpl::GetIsTranslated(PRBool *aIsTranslated)
 131 {
 132 #ifdef __ppc__
 133   static PRBool  sInitialized = PR_FALSE;
 134
 135   // Initialize sIsNative to 1.  If the sysctl fails because it doesn't
 136   // exist, then translation is not possible, so the process must not be
 137   // running translated.
 138   static PRInt32 sIsNative = 1;
 139
 140   if (!sInitialized) {
 141     size_t sz = sizeof(sIsNative);
 142     sysctlbyname("sysctl.proc_native", &sIsNative, &sz, NULL, 0);
 143     sInitialized = PR_TRUE;
 144   }
 145
 146   *aIsTranslated = !sIsNative;
 147 #else
 148   // Translation only exists for ppc code.  Other architectures aren't
 149   // translated.
 150   *aIsTranslated = PR_FALSE;
 151 #endif
 152
 153   return NS_OK;
 154 }