1 /*
2 * Copyright (c) 1999, 2012, 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.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
241 julong temp_limit = ((upper_limit - lower_limit) / 2) + lower_limit;
242 temp_limit = align_size_down_(temp_limit, min_allocation_size);
243 if (is_allocatable(temp_limit)) {
244 lower_limit = temp_limit;
245 } else {
246 upper_limit = temp_limit;
247 }
248 }
249 *limit = lower_limit;
250 }
251 return true;
252 #endif
253 }
254
255 const char* os::get_current_directory(char *buf, size_t buflen) {
256 return getcwd(buf, buflen);
257 }
258
259 FILE* os::open(int fd, const char* mode) {
260 return ::fdopen(fd, mode);
261 }
262
263 os::WatcherThreadCrashProtection::WatcherThreadCrashProtection() {
264 assert(Thread::current()->is_Watcher_thread(), "Must be WatcherThread");
265 }
266
267 /*
268 * See the caveats for this class in os_posix.hpp
269 * Protects the callback call so that SIGSEGV / SIGBUS jumps back into this
270 * method and returns false. If none of the signals are raised, returns true.
271 * The callback is supposed to provide the method that should be protected.
272 */
273 bool os::WatcherThreadCrashProtection::call(os::CrashProtectionCallback& cb) {
274 assert(Thread::current()->is_Watcher_thread(), "Only for WatcherThread");
275 assert(!WatcherThread::watcher_thread()->has_crash_protection(),
276 "crash_protection already set?");
277
278 if (sigsetjmp(_jmpbuf, 1) == 0) {
279 // make sure we can see in the signal handler that we have crash protection
280 // installed
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1 /*
2 * Copyright (c) 1999, 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.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
241 julong temp_limit = ((upper_limit - lower_limit) / 2) + lower_limit;
242 temp_limit = align_size_down_(temp_limit, min_allocation_size);
243 if (is_allocatable(temp_limit)) {
244 lower_limit = temp_limit;
245 } else {
246 upper_limit = temp_limit;
247 }
248 }
249 *limit = lower_limit;
250 }
251 return true;
252 #endif
253 }
254
255 const char* os::get_current_directory(char *buf, size_t buflen) {
256 return getcwd(buf, buflen);
257 }
258
259 FILE* os::open(int fd, const char* mode) {
260 return ::fdopen(fd, mode);
261 }
262
263 void* os::get_default_process_handle() {
264 return (void*)::dlopen(NULL, RTLD_LAZY);
265 }
266
267 // Builds a platform dependent Agent_OnLoad_<lib_name> function name
268 // which is used to find statically linked in agents.
269 // Parameters:
270 // sym_name: Symbol in library we are looking for
271 // lib_name: Name of library to look in, NULL for shared libs.
272 // is_absolute_path == true if lib_name is absolute path to agent
273 // such as "/a/b/libL.so"
274 // == false if only the base name of the library is passed in
275 // such as "L"
276 char* os::build_agent_function_name(const char *symName, const char *lib_name,
277 bool is_absolute_path) {
278 char *agent_entry_name;
279 size_t len;
280 size_t name_len;
281 size_t prefix_len = strlen(JNI_LIB_PREFIX);
282 size_t suffix_len = strlen(JNI_LIB_SUFFIX);
283 const char *start;
284
285 if (lib_name != NULL) {
286 len = name_len = strlen(lib_name);
287 if (is_absolute_path) {
288 // Need to strip path, prefix and suffix
289 if ((start = strrchr(lib_name, *os::file_separator())) != NULL) {
290 lib_name = ++start;
291 }
292 if (len <= (prefix_len + suffix_len)) {
293 return NULL;
294 }
295 lib_name += prefix_len;
296 name_len = strlen(lib_name) - suffix_len;
297 }
298 }
299 len = (lib_name != NULL ? name_len : 0) + strlen(symName) + 2;
300 agent_entry_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtThread);
301 if (agent_entry_name == NULL) {
302 return NULL;
303 }
304 strcpy(agent_entry_name, symName);
305 if (lib_name != NULL) {
306 strcat(agent_entry_name, "_");
307 strncat(agent_entry_name, lib_name, name_len);
308 }
309 return agent_entry_name;
310 }
311
312 os::WatcherThreadCrashProtection::WatcherThreadCrashProtection() {
313 assert(Thread::current()->is_Watcher_thread(), "Must be WatcherThread");
314 }
315
316 /*
317 * See the caveats for this class in os_posix.hpp
318 * Protects the callback call so that SIGSEGV / SIGBUS jumps back into this
319 * method and returns false. If none of the signals are raised, returns true.
320 * The callback is supposed to provide the method that should be protected.
321 */
322 bool os::WatcherThreadCrashProtection::call(os::CrashProtectionCallback& cb) {
323 assert(Thread::current()->is_Watcher_thread(), "Only for WatcherThread");
324 assert(!WatcherThread::watcher_thread()->has_crash_protection(),
325 "crash_protection already set?");
326
327 if (sigsetjmp(_jmpbuf, 1) == 0) {
328 // make sure we can see in the signal handler that we have crash protection
329 // installed
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