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comparison: agent/src/os/linux/libproc.h
agent/src/os/linux/libproc.h
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| 1 /* | |
| 2 * Copyright (c) 2003, 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 * | |
| 23 */ | |
| 24 | |
| 25 #ifndef _LIBPROC_H_ | |
| 26 #define _LIBPROC_H_ | |
| 27 | |
| 28 #include <jni.h> | |
| 29 #include <unistd.h> | |
| 30 #include <stdint.h> | |
| 31 #include "proc_service.h" | |
| 32 | |
| 33 #if defined(arm) || defined(ppc) | |
| 34 #include "libproc_md.h" | |
| 35 #endif | |
| 36 | |
| 37 #include <sys/ptrace.h> | |
| 38 | |
| 39 /************************************************************************************ | |
| 40 | |
| 41 0. This is very minimal subset of Solaris libproc just enough for current application. | |
| 42 Please note that the bulk of the functionality is from proc_service interface. This | |
| 43 adds Pgrab__ and some missing stuff. We hide the difference b/w live process and core | |
| 44 file by this interface. | |
| 45 | |
| 46 1. pthread_id unique in both NPTL & LinuxThreads. We store this in | |
| 47 OSThread::_pthread_id in JVM code. | |
| 48 | |
| 49 2. All threads see the same pid when they call getpid() under NPTL. | |
| 50 Threads receive different pid under LinuxThreads. We used to save the result of | |
| 51 ::getpid() call in OSThread::_thread_id. This way uniqueness of OSThread::_thread_id | |
| 52 was lost under NPTL. Now, we store the result of ::gettid() call in | |
| 53 OSThread::_thread_id. Because gettid returns actual pid of thread (lwp id), this is | |
| 54 unique again. We therefore use OSThread::_thread_id as unique identifier. | |
| 55 | |
| 56 3. There is a unique LWP id under both thread libraries. libthread_db maps pthread_id | |
| 57 to its underlying lwp_id under both the thread libraries. thread_info.lwp_id stores | |
| 58 lwp_id of the thread. The lwp id is nothing but the actual pid of clone'd processes. But | |
| 59 unfortunately libthread_db does not work very well for core dumps. So, we get pthread_id | |
| 60 only for processes. For core dumps, we don't use libthread_db at all (like gdb). | |
| 61 | |
| 62 4. ptrace operates on this LWP id under both the thread libraries. When we say 'pid' for | |
| 63 ptrace call, we refer to lwp_id of the thread. | |
| 64 | |
| 65 5. for core file, we parse ELF files and read data from them. For processes we use | |
| 66 combination of ptrace and /proc calls. | |
| 67 | |
| 68 *************************************************************************************/ | |
| 69 | |
| 70 | |
| 71 #if defined(sparc) || defined(sparcv9) || defined(ppc64) | |
| 72 #define user_regs_struct pt_regs | |
| 73 #endif | |
| 74 | |
| 75 // This C bool type must be int for compatibility with Linux calls and | |
| 76 // it would be a mistake to equivalence it to C++ bool on many platforms | |
| 77 | |
| 78 typedef int bool; | |
| 79 #define true 1 | |
| 80 #define false 0 | |
| 81 | |
| 82 struct ps_prochandle; | |
| 83 | |
| 84 // attach to a process | |
| 85 struct ps_prochandle* Pgrab(pid_t pid); | |
| 86 | |
| 87 // attach to a core dump | |
| 88 struct ps_prochandle* Pgrab_core(const char* execfile, const char* corefile); | |
| 89 | |
| 90 // release a process or core | |
| 91 void Prelease(struct ps_prochandle* ph); | |
| 92 | |
| 93 // functions not directly available in Solaris libproc | |
| 94 | |
| 95 // initialize libproc (call this only once per app) | |
| 96 // pass true to make library verbose | |
| 97 bool init_libproc(bool verbose); | |
| 98 | |
| 99 // get number of threads | |
| 100 int get_num_threads(struct ps_prochandle* ph); | |
| 101 | |
| 102 // get lwp_id of n'th thread | |
| 103 lwpid_t get_lwp_id(struct ps_prochandle* ph, int index); | |
| 104 | |
| 105 // get regs for a given lwp | |
| 106 bool get_lwp_regs(struct ps_prochandle* ph, lwpid_t lid, struct user_regs_struct* regs); | |
| 107 | |
| 108 // get number of shared objects | |
| 109 int get_num_libs(struct ps_prochandle* ph); | |
| 110 | |
| 111 // get name of n'th lib | |
| 112 const char* get_lib_name(struct ps_prochandle* ph, int index); | |
| 113 | |
| 114 // get base of lib | |
| 115 uintptr_t get_lib_base(struct ps_prochandle* ph, int index); | |
| 116 | |
| 117 // returns true if given library is found in lib list | |
| 118 bool find_lib(struct ps_prochandle* ph, const char *lib_name); | |
| 119 | |
| 120 // symbol lookup | |
| 121 uintptr_t lookup_symbol(struct ps_prochandle* ph, const char* object_name, | |
| 122 const char* sym_name); | |
| 123 | |
| 124 // address->nearest symbol lookup. return NULL for no symbol | |
| 125 const char* symbol_for_pc(struct ps_prochandle* ph, uintptr_t addr, uintptr_t* poffset); | |
| 126 | |
| 127 struct ps_prochandle* get_proc_handle(JNIEnv* env, jobject this_obj); | |
| 128 | |
| 129 void throw_new_debugger_exception(JNIEnv* env, const char* errMsg); | |
| 130 | |
| 131 #endif //__LIBPROC_H_ |
