Issue #1905 - Part 1 - Implement detection of Monterey (12.x), Intel emulation and fix required OS version check.

2 files changed, 44 insertions, 2 deletions

diff --git a/widget/cocoa/nsCocoaFeatures.h b/widget/cocoa/nsCocoaFeatures.h
index a9cab95d56..c6841a7491 100644
--- a/widget/cocoa/nsCocoaFeatures.h
+++ b/widget/cocoa/nsCocoaFeatures.h
@@ -25,9 +25,12 @@ public:
   static bool OnMojaveOrLater();
   static bool OnCatalinaOrLater();
   static bool OnBigSurOrLater();
+  static bool OnMontereyOrLater();
 
   static bool IsAtLeastVersion(int32_t aMajor, int32_t aMinor, int32_t aBugFix=0);
 
+  static bool ProcessIsRosettaTranslated();
+
   // These are utilities that do not change or depend on the value of mOSXVersion
   // and instead just encapsulate the encoding algorithm.  Note that GetVersion
   // actually adjusts to the lowest supported OS, so it will always return
diff --git a/widget/cocoa/nsCocoaFeatures.mm b/widget/cocoa/nsCocoaFeatures.mm
index e0fafb7d96..2edb958931 100644
--- a/widget/cocoa/nsCocoaFeatures.mm
+++ b/widget/cocoa/nsCocoaFeatures.mm
@@ -26,6 +26,7 @@
 #define MACOS_VERSION_10_15_HEX 0x000A0F00
 #define MACOS_VERSION_10_16_HEX 0x000A1000
 #define MACOS_VERSION_11_0_HEX 0x000B0000
+#define MACOS_VERSION_12_0_HEX 0x000C0000
 
 #include "nsCocoaFeatures.h"
 #include "nsCocoaUtils.h"
@@ -33,6 +34,7 @@
 #include "nsObjCExceptions.h"
 
 #import <Cocoa/Cocoa.h>
+#include <sys/sysctl.h>
 
 int32_t nsCocoaFeatures::mOSVersion = 0;
 
@@ -196,14 +198,51 @@ nsCocoaFeatures::OnCatalinaOrLater()
 /* static */ bool
 nsCocoaFeatures::OnBigSurOrLater()
 {
-  // Account for the version being 10.16 (which occurs when the
-  // application is linked with an older SDK) or 11.0 on Big Sur.
+  // Account for the version being 10.16 or 11.0 on Big Sur.
+  // The version is reported as 10.16 if SYSTEM_VERSION_COMPAT is set to 1,
+  // or if SYSTEM_VERSION_COMPAT is not set and the application is linked
+  // with a pre-Big Sur SDK.
+  // We should set SYSTEM_VERSION_COMPAT to 0 in its Info.plist, so it'll
+  // usually see the correct 11.* version, despite being linked against an
+  // old SDK. However, it still sees the 10.16 compatibility version when
+  // launched from the command line, see bug 1727624. (This only applies to
+  // the Intel build - the arm64 build is linked against a Big Sur SDK and
+  // always sees the correct version.)
   return ((macOSVersion() >= MACOS_VERSION_10_16_HEX) ||
           (macOSVersion() >= MACOS_VERSION_11_0_HEX));
 }
 
+/* static */ bool nsCocoaFeatures::OnMontereyOrLater()
+{
+  // Monterey pretends to be 10.16 and is indistinguishable from Big Sur.
+  // In practice, this means that an Intel build can return false
+  // from this function if it's launched from the command line, see bug 1727624.
+  // This will not be an issue anymore once we link against the Big Sur SDK.
+  return (macOSVersion() >= MACOS_VERSION_12_0_HEX);
+}
+
 /* static */ bool
 nsCocoaFeatures::IsAtLeastVersion(int32_t aMajor, int32_t aMinor, int32_t aBugFix)
 {
     return macOSVersion() >= GetVersion(aMajor, aMinor, aBugFix);
 }
+
+/*
+ * Returns true if the process is running under Rosetta translation. Returns
+ * false if running natively or if an error was encountered. We use the
+ * `sysctl.proc_translated` sysctl which is documented by Apple to be used
+ * for this purpose. Note: using this in a sandboxed process requires allowing
+ * the sysctl in the sandbox policy.
+ */
+/* static */ bool nsCocoaFeatures::ProcessIsRosettaTranslated()
+{
+  int ret = 0;
+  size_t size = sizeof(ret);
+  if (sysctlbyname("sysctl.proc_translated", &ret, &size, NULL, 0) == -1) {
+    if (errno != ENOENT) {
+      fprintf(stderr, "Failed to check for translation environment\n");
+    }
+    return false;
+  }
+  return (ret == 1);
+}