1 /* 2 * Copyright (c) 1998, 2013, 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 * Adapted from JDK 1.2 linker_md.c v1.37. Note that we #define 28 * NATIVE here, whether or not we're running solaris native threads. 29 * Outside the VM, it's unclear how we can do the locking that is 30 * done in the green threads version of the code below. 31 */ 32 #define NATIVE 33 34 /* 35 * Machine Dependent implementation of the dynamic linking support 36 * for java. This routine is Solaris specific. 37 */ 38 39 #include <stdio.h> 40 #include <dlfcn.h> 41 #include <unistd.h> 42 #include <stdlib.h> 43 #include <string.h> 44 45 #include "path_md.h" 46 #ifndef NATIVE 47 #include "iomgr.h" 48 #include "threads_md.h" 49 #endif 50 51 #ifdef __APPLE__ 52 #define LIB_SUFFIX "dylib" 53 #else 54 #define LIB_SUFFIX "so" 55 #endif 56 57 static void dll_build_name(char* buffer, size_t buflen, 58 const char* paths, const char* fname) { 59 char *path, *paths_copy, *next_token; 60 61 paths_copy = strdup(paths); 62 if (paths_copy == NULL) { 63 return; 64 } 65 66 next_token = NULL; 67 path = strtok_r(paths_copy, PATH_SEPARATOR, &next_token); 68 69 while (path != NULL) { 70 snprintf(buffer, buflen, "%s/lib%s." LIB_SUFFIX, path, fname); 71 if (access(buffer, F_OK) == 0) { 72 break; 73 } 74 *buffer = '\0'; 75 path = strtok_r(NULL, PATH_SEPARATOR, &next_token); 76 } 77 78 free(paths_copy); 79 } 80 81 /* 82 * create a string for the JNI native function name by adding the 83 * appropriate decorations. 84 */ 85 int 86 dbgsysBuildFunName(char *name, int nameLen, int args_size, int encodingIndex) 87 { 88 /* On Solaris, there is only one encoding method. */ 89 if (encodingIndex == 0) 90 return 1; 91 return 0; 92 } 93 94 /* 95 * create a string for the dynamic lib open call by adding the 96 * appropriate pre and extensions to a filename and the path 97 */ 98 void 99 dbgsysBuildLibName(char *holder, int holderlen, const char *pname, const char *fname) 100 { 101 const int pnamelen = pname ? strlen(pname) : 0; 102 103 *holder = '\0'; 104 /* Quietly truncate on buffer overflow. Should be an error. */ 105 if (pnamelen + (int)strlen(fname) + 10 > holderlen) { 106 return; 107 } 108 109 if (pnamelen == 0) { 110 (void)snprintf(holder, holderlen, "lib%s." LIB_SUFFIX, fname); 111 } else { 112 dll_build_name(holder, holderlen, pname, fname); 113 } 114 } 115 116 #ifndef NATIVE 117 extern int thr_main(void); 118 #endif 119 120 void * 121 dbgsysLoadLibrary(const char *name, char *err_buf, int err_buflen) 122 { 123 void * result; 124 #ifdef NATIVE 125 result = dlopen(name, RTLD_LAZY); 126 #else 127 sysMonitorEnter(greenThreadSelf(), &_dl_lock); 128 result = dlopen(name, RTLD_NOW); 129 sysMonitorExit(greenThreadSelf(), &_dl_lock); 130 /* 131 * This is a bit of bulletproofing to catch the commonly occurring 132 * problem of people loading a library which depends on libthread into 133 * the VM. thr_main() should always return -1 which means that libthread 134 * isn't loaded. 135 */ 136 if (thr_main() != -1) { 137 VM_CALL(panic)("libthread loaded into green threads"); 138 } 139 #endif 140 if (result == NULL) { 141 (void)strncpy(err_buf, dlerror(), err_buflen-2); 142 err_buf[err_buflen-1] = '\0'; 143 } 144 return result; 145 } 146 147 void dbgsysUnloadLibrary(void *handle) 148 { 149 #ifndef NATIVE 150 sysMonitorEnter(greenThreadSelf(), &_dl_lock); 151 #endif 152 (void)dlclose(handle); 153 #ifndef NATIVE 154 sysMonitorExit(greenThreadSelf(), &_dl_lock); 155 #endif 156 } 157 158 void * dbgsysFindLibraryEntry(void *handle, const char *name) 159 { 160 void * sym; 161 #ifndef NATIVE 162 sysMonitorEnter(greenThreadSelf(), &_dl_lock); 163 #endif 164 sym = dlsym(handle, name); 165 #ifndef NATIVE 166 sysMonitorExit(greenThreadSelf(), &_dl_lock); 167 #endif 168 return sym; 169 } 170
