8212000: Verify exported symbols in java.base (libnet, libnio/ch)

Reviewed-by: alanb, chegar

src/java.base/share/native/libnet/net_util.h

@@ -122,8 +122,6 @@ JNIEXPORT void JNICALL Java_java_net_NetworkInterface_init(JNIEnv *env, jclass c
 
 JNIEXPORT void JNICALL NET_ThrowNew(JNIEnv *env, int errorNum, char *msg);
 
-int NET_GetError();
-
 void NET_ThrowCurrent(JNIEnv *env, char *msg);
 
 jfieldID NET_GetFileDescriptorID(JNIEnv *env);
@@ -202,7 +200,6 @@ NET_EnableFastTcpLoopback(int fd);
 
 unsigned short in_cksum(unsigned short *addr, int len);
 
-JNIEXPORT jint JNICALL
-NET_Wait(JNIEnv *env, jint fd, jint flags, jint timeout);
+jint NET_Wait(JNIEnv *env, jint fd, jint flags, jint timeout);
 
 #endif /* NET_UTILS_H */

src/java.base/unix/native/libnet/net_util_md.c

@@ -1546,7 +1546,7 @@ NET_Bind(int fd, SOCKETADDRESS *sa, int len)
  * It returns the time left from the timeout (possibly 0), or -1 if it expired.
  */
 
-JNIEXPORT jint JNICALL
+jint
 NET_Wait(JNIEnv *env, jint fd, jint flags, jint timeout)
 {
     jlong prevNanoTime = JVM_NanoTime(env, 0);

src/java.base/unix/native/libnio/ch/Net.c

@@ -747,8 +747,7 @@ Java_sun_nio_ch_Net_pollconnValue(JNIEnv *env, jclass this)
 
 /* Declared in nio_util.h */
 
-JNIEXPORT jint JNICALL
-handleSocketError(JNIEnv *env, jint errorValue)
+jint handleSocketError(JNIEnv *env, jint errorValue)
 {
     char *xn;
     switch (errorValue) {

src/java.base/unix/native/libnio/ch/nio_util.h

@@ -62,5 +62,4 @@ jlong convertLongReturnVal(JNIEnv *env, jlong n, jboolean reading);
 
 /* Defined in Net.c */
 
-JNIEXPORT jint JNICALL
-handleSocketError(JNIEnv *env, jint errorValue);
+jint handleSocketError(JNIEnv *env, jint errorValue);

src/java.base/windows/native/libnet/net_util_md.c

@@ -903,7 +903,7 @@ NET_IsEqual(jbyte* caddr1, jbyte* caddr2) {
  * It returns the time left from the timeout, or -1 if it expired.
  */
 
-JNIEXPORT jint JNICALL
+jint
 NET_Wait(JNIEnv *env, jint fd, jint flags, jint timeout)
 {
     jlong prevTime = JVM_CurrentTimeMillis(env, 0);