--- a/src/java.base/aix/native/libjsig/jsig.c	Wed Mar 28 21:00:09 2018 +0200
+++ b/src/java.base/aix/native/libjsig/jsig.c	Wed Mar 28 23:56:08 2018 +0200
@@ -37,6 +37,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <stdint.h>
+#include "jni.h"
 
 #define bool int
 #define true 1
@@ -140,11 +141,13 @@
   }
 }
 
-sa_handler_t signal(int sig, sa_handler_t disp) {
+JNIEXPORT sa_handler_t JNICALL
+signal(int sig, sa_handler_t disp) {
   return set_signal(sig, disp, false);
 }
 
-sa_handler_t sigset(int sig, sa_handler_t disp) {
+JNIEXPORT sa_handler_t JNICALL
+sigset(int sig, sa_handler_t disp) {
   return set_signal(sig, disp, true);
 }
 
@@ -161,7 +164,8 @@
   return (*os_sigaction)(sig, act, oact);
 }
 
-int sigaction(int sig, const struct sigaction *act, struct sigaction *oact) {
+JNIEXPORT int JNICALL
+sigaction(int sig, const struct sigaction *act, struct sigaction *oact) {
   int res;
   bool sigused;
   struct sigaction oldAct;
@@ -206,7 +210,8 @@
 }
 
 /* The three functions for the jvm to call into. */
-void JVM_begin_signal_setting() {
+JNIEXPORT void JNICALL
+JVM_begin_signal_setting() {
   signal_lock();
   sigemptyset(&jvmsigs);
   jvm_signal_installing = true;
@@ -214,7 +219,8 @@
   signal_unlock();
 }
 
-void JVM_end_signal_setting() {
+JNIEXPORT void JNICALL
+JVM_end_signal_setting() {
   signal_lock();
   jvm_signal_installed = true;
   jvm_signal_installing = false;
@@ -222,7 +228,8 @@
   signal_unlock();
 }
 
-struct sigaction *JVM_get_signal_action(int sig) {
+JNIEXPORT struct sigaction * JNICALL
+JVM_get_signal_action(int sig) {
   /* Does race condition make sense here? */
   if (sigismember(&jvmsigs, sig)) {
     return &sact[sig];