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annotate agent/src/os/linux/libproc.h @ 20787:4206e725d584 jdk8u31-b13
Added tag jdk8u31-b12 for changeset e13839545238
author | asaha |
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date | Mon, 08 Dec 2014 12:28:35 -0800 |
parents | a07a3a29df67 |
children | 52b4284cb496 |
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0 | 1 /* |
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2 * Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
25 #ifndef _LIBPROC_H_ | |
26 #define _LIBPROC_H_ | |
27 | |
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28 #include <jni.h> |
0 | 29 #include <unistd.h> |
30 #include <stdint.h> | |
31 #include "proc_service.h" | |
32 | |
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33 #if defined(arm) || defined(ppc) |
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34 #include "libproc_md.h" |
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35 #endif |
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36 |
17991 | 37 #include <sys/ptrace.h> |
0 | 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 | |
14391 | 71 #if defined(sparc) || defined(sparcv9) || defined(ppc64) |
0 | 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 | |
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127 struct ps_prochandle* get_proc_handle(JNIEnv* env, jobject this_obj); |
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128 |
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129 void throw_new_debugger_exception(JNIEnv* env, const char* errMsg); |
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130 |
0 | 131 #endif //__LIBPROC_H_ |