1/*
2 * Copyright (c) 1998, 2019, 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/*
27 * Machine Dependent implementation of the dynamic linking support
28 * for java. This routine is Unix specific.
29 */
30
31#include <stdio.h>
32#include <dlfcn.h>
33#include <unistd.h>
34#include <stdlib.h>
35#include <string.h>
36
37#include "path_md.h"
38
39#ifdef __APPLE__
40#define LIB_SUFFIX "dylib"
41#else
42#define LIB_SUFFIX "so"
43#endif
44
45static void dll_build_name(char* buffer, size_t buflen,
46 const char* paths, const char* fname) {
47 char *path, *paths_copy, *next_token;
48
49 paths_copy = strdup(paths);
50 if (paths_copy == NULL) {
51 return;
52 }
53
54 next_token = NULL;
55 path = strtok_r(paths_copy, PATH_SEPARATOR, &next_token);
56
57 while (path != NULL) {
58 snprintf(buffer, buflen, "%s/lib%s." LIB_SUFFIX, path, fname);
59 if (access(buffer, F_OK) == 0) {
60 break;
61 }
62 *buffer = '\0';
63 path = strtok_r(NULL, PATH_SEPARATOR, &next_token);
64 }
65
66 free(paths_copy);
67}
68
69/*
70 * create a string for the JNI native function name by adding the
71 * appropriate decorations.
72 */
73int
74dbgsysBuildFunName(char *name, int nameLen, int args_size, int encodingIndex)
75{
76 // On Unix, there is only one encoding method.
77 if (encodingIndex == 0)
78 return 1;
79 return 0;
80}
81
82/*
83 * create a string for the dynamic lib open call by adding the
84 * appropriate pre and extensions to a filename and the path
85 */
86void
87dbgsysBuildLibName(char *holder, int holderlen, const char *pname,
88 const char *fname)
89{
90 const int pnamelen = pname ? strlen(pname) : 0;
91
92 *holder = '\0';
93 // Quietly truncate on buffer overflow. Should be an error.
94 if (pnamelen + (int)strlen(fname) + 10 > holderlen) {
95 return;
96 }
97
98 if (pnamelen == 0) {
99 (void)snprintf(holder, holderlen, "lib%s." LIB_SUFFIX, fname);
100 } else {
101 dll_build_name(holder, holderlen, pname, fname);
102 }
103}
104
105void *
106dbgsysLoadLibrary(const char *name, char *err_buf, int err_buflen)
107{
108 void * result;
109 result = dlopen(name, RTLD_LAZY);
110 if (result == NULL) {
111 (void)strncpy(err_buf, dlerror(), err_buflen-2);
112 err_buf[err_buflen-1] = '\0';
113 }
114 return result;
115}
116
117void dbgsysUnloadLibrary(void *handle)
118{
119 (void)dlclose(handle);
120}
121
122void * dbgsysFindLibraryEntry(void *handle, const char *name)
123{
124 return dlsym(handle, name);
125}
126