Implement JVM_GetTemporaryDirectory.

substratevm/src/com.oracle.svm.core.posix/src/com/oracle/svm/core/posix/darwin/DarwinSystemPropertiesSupport.java

@@ -47,7 +47,7 @@
 public class DarwinSystemPropertiesSupport extends PosixSystemPropertiesSupport {
 
     @Override
-    protected String tmpdirValue() {
+    protected String javaIoTmpdirValue() {
         /* Darwin has a per-user temp dir */
         int buflen = Limits.PATH_MAX();
         CCharPointer tmpPath = StackValue.get(buflen);
@@ -56,8 +56,7 @@ protected String tmpdirValue() {
             return CTypeConversion.toJavaString(tmpPath);
         } else {
             /*
-             * Default as defined in JDK source/jdk/src/solaris/native/java/lang/java_props_md.c
-             * line 135.
+             * Default as defined in JDK src/java.base/unix/native/libjava/java_props_md.c line 90.
              */
             return "/var/tmp";
         }

substratevm/src/com.oracle.svm.core.posix/src/com/oracle/svm/core/posix/linux/LinuxSystemPropertiesSupport.java

@@ -40,7 +40,7 @@
 public class LinuxSystemPropertiesSupport extends PosixSystemPropertiesSupport {
 
     @Override
-    protected String tmpdirValue() {
+    protected String javaIoTmpdirValue() {
         /*
          * The initial value of `java.io.tmpdir` is hard coded in libjava when building the JDK. So
          * to be completely correct, we would have to use the value from libjava, but since it is

substratevm/src/com.oracle.svm.core.windows/src/com/oracle/svm/core/windows/WindowsSystemPropertiesSupport.java

@@ -125,7 +125,7 @@ protected String userDirValue() {
     }
 
     @Override
-    protected String tmpdirValue() {
+    protected String javaIoTmpdirValue() {
         int maxLength = WinBase.MAX_PATH + 1;
         WCharPointer tmpdir = StackValue.get(maxLength, WCharPointer.class);
         int length = FileAPI.GetTempPathW(maxLength, tmpdir);

substratevm/src/com.oracle.svm.core/src/com/oracle/svm/core/jdk/PlatformNativeLibrarySupport.java

@@ -69,6 +69,7 @@ public abstract class PlatformNativeLibrarySupport {
                     "jdk_internal_misc",
                     "jdk_internal_util",
                     "jdk_internal_jimage",
+                    "jdk_internal_vm",
                     "jdk_net",
                     "sun_invoke",
                     "sun_launcher",

substratevm/src/com.oracle.svm.core/src/com/oracle/svm/core/jdk/SystemPropertiesSupport.java

@@ -38,6 +38,7 @@
 
 import com.oracle.svm.core.VM;
 import com.oracle.svm.core.config.ConfigurationValues;
+import com.oracle.svm.core.util.VMError;
 
 /**
  * This class maintains the system properties at run time.
@@ -123,7 +124,7 @@ protected SystemPropertiesSupport() {
         lazyRuntimeValues.put("user.name", this::userName);
         lazyRuntimeValues.put("user.home", this::userHome);
         lazyRuntimeValues.put("user.dir", this::userDir);
-        lazyRuntimeValues.put("java.io.tmpdir", this::tmpDir);
+        lazyRuntimeValues.put("java.io.tmpdir", this::javaIoTmpDir);
         lazyRuntimeValues.put("java.library.path", this::javaLibraryPath);
         lazyRuntimeValues.put("os.version", this::osVersionValue);
 
@@ -249,13 +250,13 @@ String userDir() {
         return cachedUserDir;
     }
 
-    private String cachedtmpDir;
+    private String cachedJavaIoTmpdir;
 
-    String tmpDir() {
-        if (cachedtmpDir == null) {
-            cachedtmpDir = tmpdirValue();
+    String javaIoTmpDir() {
+        if (cachedJavaIoTmpdir == null) {
+            cachedJavaIoTmpdir = javaIoTmpdirValue();
         }
-        return cachedtmpDir;
+        return cachedJavaIoTmpdir;
     }
 
     private String cachedJavaLibraryPath;
@@ -275,7 +276,13 @@ String javaLibraryPath() {
 
     protected abstract String userDirValue();
 
-    protected abstract String tmpdirValue();
+    protected String javaIoTmpdirValue() {
+        return tmpdirValue();
+    }
+
+    protected String tmpdirValue() {
+        throw VMError.unimplemented();
+    }
 
     protected String javaLibraryPathValue() {
         /* Default implementation. */

substratevm/src/com.oracle.svm.core/src/com/oracle/svm/core/jdk/Target_jdk_internal_util_StaticProperty.java

@@ -65,7 +65,7 @@ private static String userName() {
     @Substitute
     @TargetElement(onlyWith = JDK17OrLater.class)
     private static String javaIoTmpDir() {
-        return ImageSingletons.lookup(SystemPropertiesSupport.class).tmpDir();
+        return ImageSingletons.lookup(SystemPropertiesSupport.class).javaIoTmpDir();
     }
 
     @Substitute

substratevm/src/com.oracle.svm.native.jvm.posix/src/JvmFuncs.c

@@ -38,6 +38,7 @@
 #include <string.h>
 #include <sys/ioctl.h>
 #include <sys/time.h>
+#include <limits.h>
 
 #include <jni.h>
 
@@ -319,6 +320,27 @@ JNIEXPORT jobject JNICALL JVM_DoPrivileged(JNIEnv *env, jclass cls, jobject acti
     return NULL;
 }
 
+#ifdef __APPLE__
+char temp_path_storage[PATH_MAX];
+JNIEXPORT jstring JNICALL JVM_GetTemporaryDirectory(JNIEnv *env) {
+    // see os_bsd.cpp line 910
+    static char *temp_path = NULL;
+    if (temp_path == NULL) {
+        int pathSize = confstr(_CS_DARWIN_USER_TEMP_DIR, temp_path_storage, PATH_MAX);
+        if (pathSize == 0 || pathSize > PATH_MAX) {
+            strlcpy(temp_path_storage, "/tmp/", sizeof(temp_path_storage));
+        }
+        temp_path = temp_path_storage;
+    }
+    return (*env)->NewStringUTF(env, temp_path);
+}
+#else
+JNIEXPORT jstring JNICALL JVM_GetTemporaryDirectory(JNIEnv *env) {
+    // see os_linux.cpp line 1380
+    return (*env)->NewStringUTF(env, "/tmp");
+}
+#endif /* __APPLE__ */
+
 JNIEXPORT jobject JNICALL Java_sun_nio_ch_sctp_SctpChannelImpl_initIDs(JNIEnv *env) {
     (*env)->FatalError(env, "Currently SCTP not supported for native-images");
     return NULL;

substratevm/src/com.oracle.svm.native.jvm.windows/src/JvmFuncs.c

@@ -242,6 +242,15 @@ JNIEXPORT jobject JNICALL JVM_DoPrivileged(JNIEnv *env, jclass cls, jobject acti
     return NULL;
 }
 
+JNIEXPORT jstring JNICALL JVM_GetTemporaryDirectory(JNIEnv *env) {
+    // see os_windows.cpp line 1367
+    static char path_buf[MAX_PATH];
+    if (GetTempPath(MAX_PATH, path_buf) <= 0) {
+        path_buf[0] = '\0';
+    }
+    return (*env)->NewStringUTF(env, path_buf);
+}
+
 jboolean VerifyFixClassname(char *utf_name) {
     fprintf(stderr, "VerifyFixClassname(%s) called:  Unimplemented\n", utf_name);
     abort();