Bug 1015547 - Prefer arc4random to generate UUIDs on BSDs. r=vlad, r=glandium

configure.in

@@ -2928,7 +2928,7 @@ dnl Checks for library functions.
 dnl ========================================================
 AC_PROG_GCC_TRADITIONAL
 AC_FUNC_MEMCMP
-AC_CHECK_FUNCS(stat64 lstat64 truncate64 statvfs64 statvfs statfs64 statfs getpagesize localtime_r)
+AC_CHECK_FUNCS(stat64 lstat64 truncate64 statvfs64 statvfs statfs64 statfs getpagesize localtime_r arc4random)
 
 dnl check for clock_gettime(), the CLOCK_MONOTONIC clock
 AC_CACHE_CHECK(for clock_gettime(CLOCK_MONOTONIC),

xpcom/base/nsUUIDGenerator.cpp

@@ -35,7 +35,7 @@ nsUUIDGenerator::Init()
   // We're a service, so we're guaranteed that Init() is not going
   // to be reentered while we're inside Init().
 
-#if !defined(XP_WIN) && !defined(XP_MACOSX) && !defined(ANDROID)
+#if !defined(XP_WIN) && !defined(XP_MACOSX) && !defined(HAVE_ARC4RANDOM)
   /* initialize random number generator using NSPR random noise */
   unsigned int seed;
 
@@ -72,7 +72,7 @@ nsUUIDGenerator::Init()
   }
 #endif
 
-#endif /* non XP_WIN and non XP_MACOSX */
+#endif /* non XP_WIN and non XP_MACOSX and non ARC4RANDOM */
 
   return NS_OK;
 }
@@ -122,13 +122,13 @@ nsUUIDGenerator::GenerateUUIDInPlace(nsID* aId)
    * back to it; instead, we use the value returned when we called
    * initstate, since older glibc's have broken setstate() return values
    */
-#ifndef ANDROID
+#ifndef HAVE_ARC4RANDOM
   setstate(mState);
 #endif
 
   size_t bytesLeft = sizeof(nsID);
   while (bytesLeft > 0) {
-#ifdef ANDROID
+#ifdef HAVE_ARC4RANDOM
     long rval = arc4random();
     const size_t mRBytes = 4;
 #else
@@ -159,7 +159,7 @@ nsUUIDGenerator::GenerateUUIDInPlace(nsID* aId)
   aId->m3[0] &= 0x3f;
   aId->m3[0] |= 0x80;
 
-#ifndef ANDROID
+#ifndef HAVE_ARC4RANDOM
   /* Restore the previous RNG state */
   setstate(mSavedState);
 #endif

xpcom/base/nsUUIDGenerator.h

@@ -29,7 +29,7 @@ private:
 protected:
 
   mozilla::Mutex mLock;
-#if !defined(XP_WIN) && !defined(XP_MACOSX) && !defined(ANDROID)
+#if !defined(XP_WIN) && !defined(XP_MACOSX) && !defined(HAVE_ARC4RANDOM)
   char mState[128];
   char* mSavedState;
   uint8_t mRBytes;