APPLE: Use System API for Temporary Directory location

Author: dgovil

pxr/base/arch/CMakeLists.txt

@@ -4,15 +4,21 @@ set(CMAKE_INCLUDE_CURRENT_DIR OFF)
 set(PXR_PREFIX pxr/base)
 set(PXR_PACKAGE arch)
 
-set(PLATFORM_LIBS ${M_LIB})
+set(ARCH_PLATFORM_LIBS ${M_LIB})
+set(ARCH_PLATFORM_HEADERS "")
+set(ARCH_PLATFORM_CPPFILES "")
 if(WIN32)
-    set(PLATFORM_LIBS Ws2_32.lib Dbghelp.lib ${PLATFORM_LIBS})
+    set(ARCH_PLATFORM_LIBS Ws2_32.lib Dbghelp.lib ${ARCH_PLATFORM_LIBS})
+elseif (APPLE)
+    set(ARCH_PLATFORM_HEADERS darwin.h)
+    set(ARCH_PLATFORM_CPPFILES darwin.mm)
+    set(ARCH_PLATFORM_LIBS "-framework Foundation" ${ARCH_PLATFORM_LIBS})
 endif()
 
 pxr_library(arch
     LIBRARIES
         ${CMAKE_DL_LIBS}
-        ${PLATFORM_LIBS}
+        ${ARCH_PLATFORM_LIBS}
 
     PUBLIC_CLASSES
         align
@@ -51,10 +57,12 @@ pxr_library(arch
     PRIVATE_HEADERS
         testArchAbi.h
         testArchUtil.h
+        ${ARCH_PLATFORM_HEADERS}
 
     CPPFILES
         assumptions.cpp
         initConfig.cpp
+        ${ARCH_PLATFORM_CPPFILES}
 
     DOXYGEN_FILES
         overview.dox

pxr/base/arch/darwin.h

@@ -0,0 +1,16 @@
+//
+// Copyright 2025 Pixar
+//
+// Licensed under the terms set forth in the LICENSE.txt file available at
+// https://openusd.org/license.
+//
+#ifndef PXR_ARCH_DARWIN_H
+#define PXR_ARCH_DARWIN_H
+#include "pxr/pxr.h"
+
+PXR_NAMESPACE_OPEN_SCOPE
+
+const char* Arch_DarwinGetTemporaryDirectory();
+
+PXR_NAMESPACE_CLOSE_SCOPE
+#endif // PXR_ARCH_DARWIN_H

pxr/base/arch/darwin.mm

@@ -0,0 +1,25 @@
+//
+// Copyright 2025 Pixar
+//
+// Licensed under the terms set forth in the LICENSE.txt file available at
+// https://openusd.org/license.
+//
+
+#include "pxr/base/arch/darwin.h"
+#import <Foundation/Foundation.h>
+#include <string>
+
+PXR_NAMESPACE_OPEN_SCOPE
+
+
+const char* Arch_DarwinGetTemporaryDirectory() {
+    char* temporaryDirectory;
+
+    const char *nsTmpDir = [NSTemporaryDirectory() UTF8String];
+    temporaryDirectory = new char[strlen(nsTmpDir) + 1];
+    strcpy(temporaryDirectory, nsTmpDir);
+
+    return temporaryDirectory;
+}
+
+PXR_NAMESPACE_CLOSE_SCOPE

pxr/base/arch/fileSystem.cpp

@@ -41,6 +41,10 @@
 #include <unistd.h>
 #endif
 
+#if defined(ARCH_OS_DARWIN)
+#include "pxr/base/arch/darwin.h"
+#endif
+
 PXR_NAMESPACE_OPEN_SCOPE
 
 using std::pair;
@@ -730,6 +734,9 @@ Arch_InitTmpDir()
     // Strip the trailing slash
     tmpPath[sizeOfPath-1] = 0;
     _TmpDir = _strdup(ArchWindowsUtf16ToUtf8(tmpPath).c_str());
+#elif defined(ARCH_OS_DARWIN)
+    // On Apple platforms, we use the system APIs to get the designated temp directory
+    _TmpDir = Arch_DarwinGetTemporaryDirectory();
 #else
     const std::string tmpdir = ArchGetEnv("TMPDIR");
     if (!tmpdir.empty()) {
@@ -738,11 +745,7 @@ Arch_InitTmpDir()
         // set, the following call will leak a string.
         _TmpDir = strdup(tmpdir.c_str());
     } else {
-#if defined(ARCH_OS_DARWIN)
-        _TmpDir = "/tmp";
-#else
         _TmpDir = "/var/tmp";
-#endif
     }
 #endif
 }