6728542: (se) epoll based SelectorProvider should be portable to platforms other than x86 and x64

Reviewed-by: sherman

make/java/nio/mapfile-linux

@@ -18,6 +18,8 @@ SUNWprivate_1.1 {
 		Java_sun_nio_ch_EPollArrayWrapper_fdLimit;
 		Java_sun_nio_ch_EPollArrayWrapper_init;
 		Java_sun_nio_ch_EPollArrayWrapper_interrupt;
+		Java_sun_nio_ch_EPollArrayWrapper_offsetofData;
+		Java_sun_nio_ch_EPollArrayWrapper_sizeofEPollEvent;
                 Java_sun_nio_ch_FileChannelImpl_close0;
                 Java_sun_nio_ch_FileChannelImpl_force0;
                 Java_sun_nio_ch_FileChannelImpl_initIDs;

src/solaris/classes/sun/nio/ch/EPollArrayWrapper.java

@@ -69,11 +69,11 @@ class EPollArrayWrapper {
     static final int EPOLL_CTL_MOD      = 3;
 
     // Miscellaneous constants
-    static final short SIZE_EPOLLEVENT  = 12;
-    static final short EVENT_OFFSET     = 0;
-    static final short DATA_OFFSET      = 4;
-    static final short FD_OFFSET        = 4;
-    static final int   NUM_EPOLLEVENTS  = Math.min(fdLimit(), 8192);
+    static final int SIZE_EPOLLEVENT  = sizeofEPollEvent();
+    static final int EVENT_OFFSET     = 0;
+    static final int DATA_OFFSET      = offsetofData();
+    static final int FD_OFFSET        = DATA_OFFSET;
+    static final int NUM_EPOLLEVENTS  = Math.min(fdLimit(), 8192);
 
     // Base address of the native pollArray
     private final long pollArrayAddress;
@@ -280,6 +280,8 @@ class EPollArrayWrapper {
     private native void epollCtl(int epfd, int opcode, int fd, int events);
     private native int epollWait(long pollAddress, int numfds, long timeout,
                                  int epfd) throws IOException;
+    private static native int sizeofEPollEvent();
+    private static native int offsetofData();
     private static native int fdLimit();
     private static native void interrupt(int fd);
     private static native void init();

src/solaris/native/sun/nio/ch/EPollArrayWrapper.c

@@ -48,10 +48,18 @@ typedef union epoll_data {
     __uint64_t u64;
 } epoll_data_t;
 
+
+/* x86-64 has same alignment as 32-bit */
+#ifdef __x86_64__
+#define EPOLL_PACKED __attribute__((packed))
+#else
+#define EPOLL_PACKED
+#endif
+
 struct epoll_event {
     __uint32_t events;  /* Epoll events */
     epoll_data_t data;  /* User data variable */
-} __attribute__ ((__packed__));
+} EPOLL_PACKED;
 
 #ifdef  __cplusplus
 }
@@ -143,6 +151,18 @@ Java_sun_nio_ch_EPollArrayWrapper_fdLimit(JNIEnv *env, jclass this)
     return (jint)rlp.rlim_max;
 }
 
+JNIEXPORT jint JNICALL
+Java_sun_nio_ch_EPollArrayWrapper_sizeofEPollEvent(JNIEnv* env, jclass this)
+{
+    return sizeof(struct epoll_event);
+}
+
+JNIEXPORT jint JNICALL
+Java_sun_nio_ch_EPollArrayWrapper_offsetofData(JNIEnv* env, jclass this)
+{
+    return offsetof(struct epoll_event, data);
+}
+
 JNIEXPORT void JNICALL
 Java_sun_nio_ch_EPollArrayWrapper_epollCtl(JNIEnv *env, jobject this, jint epfd,
                                            jint opcode, jint fd, jint events)