diff --git a/src/java/com/threerings/util/unsafe/FreeBSD/com_threerings_util_unsafe_Unsafe.c b/src/java/com/threerings/util/unsafe/FreeBSD/com_threerings_util_unsafe_Unsafe.c
index 04ac0526..abe1fd3e 100644
--- a/src/java/com/threerings/util/unsafe/FreeBSD/com_threerings_util_unsafe_Unsafe.c
+++ b/src/java/com/threerings/util/unsafe/FreeBSD/com_threerings_util_unsafe_Unsafe.c
@@ -77,6 +77,26 @@ Java_com_threerings_util_unsafe_Unsafe_nativeSetgid (
     return JNI_TRUE;
 }
 
+JNIEXPORT jboolean JNICALL Java_com_threerings_util_unsafe_Unsafe_nativeSeteuid (
+    JNIEnv* env, jclass clzz, jint uid)
+{
+    if (seteuid((uid_t)uid) != 0) {
+        fprintf(stderr, "seteuid(%d) failed: %s\n", uid, strerror(errno));
+        return JNI_FALSE;
+    }
+    return JNI_TRUE;
+}
+
+JNIEXPORT jboolean JNICALL Java_com_threerings_util_unsafe_Unsafe_nativeSetegid (
+    JNIEnv* env, jclass clazz, jint gid)
+{
+    if (setegid((gid_t)gid) != 0) {
+        fprintf(stderr, "setegid(%d) failed: %s\n", gid, strerror(errno));
+        return JNI_FALSE;
+    }
+    return JNI_TRUE;
+}
+
 JNIEXPORT jboolean JNICALL
 Java_com_threerings_util_unsafe_Unsafe_init (JNIEnv* env, jclass clazz)
 {
diff --git a/src/java/com/threerings/util/unsafe/Mac OS X/libunsafe.jnilib b/src/java/com/threerings/util/unsafe/Mac OS X/libunsafe.jnilib
index 18b5c075..4e7796d8 100755
Binary files a/src/java/com/threerings/util/unsafe/Mac OS X/libunsafe.jnilib and b/src/java/com/threerings/util/unsafe/Mac OS X/libunsafe.jnilib differ
diff --git a/src/java/com/threerings/util/unsafe/Unsafe.java b/src/java/com/threerings/util/unsafe/Unsafe.java
index c275b402..1a7e030f 100644
--- a/src/java/com/threerings/util/unsafe/Unsafe.java
+++ b/src/java/com/threerings/util/unsafe/Unsafe.java
@@ -73,7 +73,7 @@ public class Unsafe
     }
 
     /**
-     * Sets the processes uid to the specified value.
+     * Sets the process' uid to the specified value.
      *
      * @return true if the uid was changed, false if we were unable to do so.
      */
@@ -86,9 +86,9 @@ public class Unsafe
     }
 
     /**
-     * Sets the processes uid to the specified value.
+     * Sets the process' gid to the specified value.
      *
-     * @return true if the uid was changed, false if we were unable to do so.
+     * @return true if the gid was changed, false if we were unable to do so.
      */
     public static boolean setgid (int gid)
     {
@@ -98,6 +98,32 @@ public class Unsafe
         return false;
     }
 
+    /**
+     * Sets the process' effective uid to the specified value.
+     *
+     * @return true if the euid was changed, false if we were unable to do so.
+     */
+    public static boolean seteuid (int uid)
+    {
+        if (_loaded && !RunAnywhere.isWindows()) {
+            return nativeSeteuid(uid);
+        }
+        return false;
+    }
+
+    /**
+     * Sets the process' effective gid to the specified value.
+     *
+     * @return true if the egid was changed, false if we were unable to do so.
+     */
+    public static boolean setegid (int gid)
+    {
+        if (_loaded && !RunAnywhere.isWindows()) {
+            return nativeSetegid(gid);
+        }
+        return false;
+    }
+
     /**
      * Reenable garbage collection after a call to {@link #disableGC}.
      */
@@ -123,6 +149,16 @@ public class Unsafe
      */
     protected static native boolean nativeSetgid (int gid);
 
+    /**
+     * Calls through to the native OS system call to change our euid.
+     */
+    protected static native boolean nativeSeteuid (int uid);
+
+    /**
+     * Calls through to the native OS system call to change our egid.
+     */
+    protected static native boolean nativeSetegid (int gid);
+
     /**
      * Called to initialize our library.
      */
diff --git a/src/java/com/threerings/util/unsafe/Windows/com_threerings_util_unsafe_Unsafe.c b/src/java/com/threerings/util/unsafe/Windows/com_threerings_util_unsafe_Unsafe.c
index dcb2e950..82622f94 100644
--- a/src/java/com/threerings/util/unsafe/Windows/com_threerings_util_unsafe_Unsafe.c
+++ b/src/java/com/threerings/util/unsafe/Windows/com_threerings_util_unsafe_Unsafe.c
@@ -32,6 +32,34 @@ Java_com_threerings_util_unsafe_Unsafe_nativeSleep (
     /* not supported */
 }
 
+JNIEXPORT jboolean JNICALL Java_com_threerings_util_unsafe_Unsafe_nativeSetuid
+    (JNIEnv *, jclass, jint)
+{
+    /* not supported */
+    return JNI_FALSE;
+}
+
+JNIEXPORT jboolean JNICALL Java_com_threerings_util_unsafe_Unsafe_nativeSetgid
+    (JNIEnv *, jclass, jint)
+{
+    /* not supported */
+    return JNI_FALSE;
+}
+
+JNIEXPORT jboolean JNICALL Java_com_threerings_util_unsafe_Unsafe_nativeSeteuid (
+    JNIEnv* env, jclass clzz, jint uid)
+{
+    /* not supported */
+    return JNI_FALSE;
+}
+
+JNIEXPORT jboolean JNICALL Java_com_threerings_util_unsafe_Unsafe_nativeSetegid (
+    JNIEnv* env, jclass clazz, jint gid)
+{
+    /* not supported */
+    return JNI_FALSE;
+}
+
 JNIEXPORT jboolean JNICALL
 Java_com_threerings_util_unsafe_Unsafe_init (JNIEnv* env, jclass clazz)
 {
diff --git a/src/java/com/threerings/util/unsafe/com_threerings_util_unsafe_Unsafe.h b/src/java/com/threerings/util/unsafe/com_threerings_util_unsafe_Unsafe.h
index f439fed8..bae9f5aa 100644
--- a/src/java/com/threerings/util/unsafe/com_threerings_util_unsafe_Unsafe.h
+++ b/src/java/com/threerings/util/unsafe/com_threerings_util_unsafe_Unsafe.h
@@ -7,8 +7,6 @@
 #ifdef __cplusplus
 extern "C" {
 #endif
-/* Inaccessible static: _gcEnabled */
-/* Inaccessible static: _loaded */
 /*
  * Class:     com_threerings_util_unsafe_Unsafe
  * Method:    enableGC
@@ -33,6 +31,38 @@ JNIEXPORT void JNICALL Java_com_threerings_util_unsafe_Unsafe_disableGC
 JNIEXPORT void JNICALL Java_com_threerings_util_unsafe_Unsafe_nativeSleep
   (JNIEnv *, jclass, jint);
 
+/*
+ * Class:     com_threerings_util_unsafe_Unsafe
+ * Method:    nativeSetuid
+ * Signature: (I)Z
+ */
+JNIEXPORT jboolean JNICALL Java_com_threerings_util_unsafe_Unsafe_nativeSetuid
+  (JNIEnv *, jclass, jint);
+
+/*
+ * Class:     com_threerings_util_unsafe_Unsafe
+ * Method:    nativeSetgid
+ * Signature: (I)Z
+ */
+JNIEXPORT jboolean JNICALL Java_com_threerings_util_unsafe_Unsafe_nativeSetgid
+  (JNIEnv *, jclass, jint);
+
+/*
+ * Class:     com_threerings_util_unsafe_Unsafe
+ * Method:    nativeSeteuid
+ * Signature: (I)Z
+ */
+JNIEXPORT jboolean JNICALL Java_com_threerings_util_unsafe_Unsafe_nativeSeteuid
+  (JNIEnv *, jclass, jint);
+
+/*
+ * Class:     com_threerings_util_unsafe_Unsafe
+ * Method:    nativeSetegid
+ * Signature: (I)Z
+ */
+JNIEXPORT jboolean JNICALL Java_com_threerings_util_unsafe_Unsafe_nativeSetegid
+  (JNIEnv *, jclass, jint);
+
 /*
  * Class:     com_threerings_util_unsafe_Unsafe
  * Method:    init