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comparison agent/src/os/linux/libproc.h @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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1 /*
2 * Copyright 2003-2007 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
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_