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 "jni.h"
  30 #include "jni_util.h"
  31 #include "dlfcn.h"
  32 
  33 void* getProcessHandle() {
  34     static void *procHandle = NULL;
  35     if (procHandle != NULL) {
  36         return procHandle;
  37     }
  38 #ifdef __APPLE__
  39     procHandle = (void*)dlopen(NULL, RTLD_FIRST);
  40 #else
  41     procHandle = (void*)dlopen(NULL, RTLD_LAZY);
  42 #endif
  43     return procHandle;
  44 }
  45 
  46 void buildJniFunctionName(const char *sym, const char *cname,
  47                           char *jniEntryName) {
  48     strcpy(jniEntryName, sym);
  49     if (cname != NULL) {
  50         strcat(jniEntryName, "_");
  51         strcat(jniEntryName, cname);
  52     }
  53 }
  54 
  55 size_t
  56 getLastErrorString(char *buf, size_t len)
  57 {
  58     char *err;
  59     size_t n;
  60     if (errno == 0 || len < 1) return 0;
  61 
  62     err = strerror(errno);
  63     n = strlen(err);
  64     if (n >= len)
  65         n = len - 1;
  66 
  67     strncpy(buf, err, n);
  68     buf[n] = '\0';
  69     return n;
  70 }