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annotate agent/src/os/linux/libproc.h @ 4701:44b122d06e3a
reduce maximum desired size
author | Christian Haeubl <christian.haeubl@oracle.com> |
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date | Fri, 24 Feb 2012 18:30:00 -0800 |
parents | c18cbe5936b8 |
children | a9fed06c01d2 |
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0 | 1 /* |
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2 * Copyright (c) 2003, 2007, 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 | |
28 #include <unistd.h> | |
29 #include <stdint.h> | |
30 #include "proc_service.h" | |
31 | |
32 #if defined(sparc) || defined(sparcv9) | |
33 /* | |
34 If _LP64 is defined ptrace.h should be taken from /usr/include/asm-sparc64 | |
35 otherwise it should be from /usr/include/asm-sparc | |
36 These two files define pt_regs structure differently | |
37 */ | |
38 #ifdef _LP64 | |
39 #include "asm-sparc64/ptrace.h" | |
40 #else | |
41 #include "asm-sparc/ptrace.h" | |
42 #endif | |
43 | |
44 #endif //sparc or sparcv9 | |
45 | |
46 /************************************************************************************ | |
47 | |
48 0. This is very minimal subset of Solaris libproc just enough for current application. | |
49 Please note that the bulk of the functionality is from proc_service interface. This | |
50 adds Pgrab__ and some missing stuff. We hide the difference b/w live process and core | |
51 file by this interface. | |
52 | |
53 1. pthread_id unique in both NPTL & LinuxThreads. We store this in | |
54 OSThread::_pthread_id in JVM code. | |
55 | |
56 2. All threads see the same pid when they call getpid() under NPTL. | |
57 Threads receive different pid under LinuxThreads. We used to save the result of | |
58 ::getpid() call in OSThread::_thread_id. This way uniqueness of OSThread::_thread_id | |
59 was lost under NPTL. Now, we store the result of ::gettid() call in | |
60 OSThread::_thread_id. Because gettid returns actual pid of thread (lwp id), this is | |
61 unique again. We therefore use OSThread::_thread_id as unique identifier. | |
62 | |
63 3. There is a unique LWP id under both thread libraries. libthread_db maps pthread_id | |
64 to its underlying lwp_id under both the thread libraries. thread_info.lwp_id stores | |
65 lwp_id of the thread. The lwp id is nothing but the actual pid of clone'd processes. But | |
66 unfortunately libthread_db does not work very well for core dumps. So, we get pthread_id | |
67 only for processes. For core dumps, we don't use libthread_db at all (like gdb). | |
68 | |
69 4. ptrace operates on this LWP id under both the thread libraries. When we say 'pid' for | |
70 ptrace call, we refer to lwp_id of the thread. | |
71 | |
72 5. for core file, we parse ELF files and read data from them. For processes we use | |
73 combination of ptrace and /proc calls. | |
74 | |
75 *************************************************************************************/ | |
76 | |
77 #ifdef ia64 | |
78 struct user_regs_struct { | |
79 /* copied from user.h which doesn't define this in a struct */ | |
80 | |
81 #define IA64_REG_COUNT (EF_SIZE/8+32) /* integer and fp regs */ | |
82 unsigned long regs[IA64_REG_COUNT]; /* integer and fp regs */ | |
83 }; | |
84 #endif | |
85 | |
86 #if defined(sparc) || defined(sparcv9) | |
87 #define user_regs_struct pt_regs | |
88 #endif | |
89 | |
90 // This C bool type must be int for compatibility with Linux calls and | |
91 // it would be a mistake to equivalence it to C++ bool on many platforms | |
92 | |
93 typedef int bool; | |
94 #define true 1 | |
95 #define false 0 | |
96 | |
97 struct ps_prochandle; | |
98 | |
99 // attach to a process | |
100 struct ps_prochandle* Pgrab(pid_t pid); | |
101 | |
102 // attach to a core dump | |
103 struct ps_prochandle* Pgrab_core(const char* execfile, const char* corefile); | |
104 | |
105 // release a process or core | |
106 void Prelease(struct ps_prochandle* ph); | |
107 | |
108 // functions not directly available in Solaris libproc | |
109 | |
110 // initialize libproc (call this only once per app) | |
111 // pass true to make library verbose | |
112 bool init_libproc(bool verbose); | |
113 | |
114 // get number of threads | |
115 int get_num_threads(struct ps_prochandle* ph); | |
116 | |
117 // get lwp_id of n'th thread | |
118 lwpid_t get_lwp_id(struct ps_prochandle* ph, int index); | |
119 | |
120 // get regs for a given lwp | |
121 bool get_lwp_regs(struct ps_prochandle* ph, lwpid_t lid, struct user_regs_struct* regs); | |
122 | |
123 // get number of shared objects | |
124 int get_num_libs(struct ps_prochandle* ph); | |
125 | |
126 // get name of n'th lib | |
127 const char* get_lib_name(struct ps_prochandle* ph, int index); | |
128 | |
129 // get base of lib | |
130 uintptr_t get_lib_base(struct ps_prochandle* ph, int index); | |
131 | |
132 // returns true if given library is found in lib list | |
133 bool find_lib(struct ps_prochandle* ph, const char *lib_name); | |
134 | |
135 // symbol lookup | |
136 uintptr_t lookup_symbol(struct ps_prochandle* ph, const char* object_name, | |
137 const char* sym_name); | |
138 | |
139 // address->nearest symbol lookup. return NULL for no symbol | |
140 const char* symbol_for_pc(struct ps_prochandle* ph, uintptr_t addr, uintptr_t* poffset); | |
141 | |
142 #endif //__LIBPROC_H_ |