src/java.base/unix/native/libjava/jni_util_md.c

@@ -1,7 +1,7 @@
 /*
- * Copyright (c) 2008, 2013, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2008, 2014, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.  Oracle designates this

@@ -21,10 +21,11 @@
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  */
 
+#include <errno.h>
 #include <string.h>
 
 #include "jni.h"
 #include "jni_util.h"
 #include "dlfcn.h"

@@ -49,5 +50,19 @@
         strcat(jniEntryName, "_");
         strcat(jniEntryName, cname);
     }
 }
 
+size_t
+getLastErrorString(char *buf, size_t len)
+{
+    if (errno == 0 || len < 1) return 0;
+
+    const char *err = strerror(errno);
+    size_t n = strlen(err);
+    if (n >= len)
+        n = len - 1;
+
+    strncpy(buf, err, n);
+    buf[n] = '\0';
+    return n;
+}