1 /*
   2  * Copyright (c) 2008, 2014, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 #include <errno.h>
  27 #include <string.h>
  28 
  29 #include "jdk_strerror.h"
  30 #include "jni.h"
  31 #include "jni_util.h"
  32 #include "dlfcn.h"
  33 
  34 void* getProcessHandle() {
  35     static void *procHandle = NULL;
  36     if (procHandle != NULL) {
  37         return procHandle;
  38     }
  39 #ifdef __APPLE__
  40     procHandle = (void*)dlopen(NULL, RTLD_FIRST);
  41 #else
  42     procHandle = (void*)dlopen(NULL, RTLD_LAZY);
  43 #endif
  44     return procHandle;
  45 }
  46 
  47 void buildJniFunctionName(const char *sym, const char *cname,
  48                           char *jniEntryName) {
  49     strcpy(jniEntryName, sym);
  50     if (cname != NULL) {
  51         strcat(jniEntryName, "_");
  52         strcat(jniEntryName, cname);
  53     }
  54 }
  55 
  56 size_t
  57 getLastErrorString(char *buf, size_t len)
  58 {
  59     char tmpbuf[1024];
  60     int n = 0;
  61 
  62     if (errno == 0 || len < 1) return 0;
  63 
  64     jdk_strerror(errno, tmpbuf, (size_t) 1024);
  65     n = strlen(tmpbuf);
  66     if (n >= (int) len)
  67         n = (int) len - 1;
  68 
  69     strncpy(buf, tmpbuf, n);
  70     buf[n] = '\0';
  71     return n;
  72 }