Mercurial > hg > truffle
annotate src/os/linux/vm/jsig.c @ 14311:e9fc29d2e8ae
8031686: G1: assert(_hrs.max_length() == _expansion_regions) failed
Summary: Using pointer_delta to avoid overflowing pointer calculation.
Reviewed-by: jmasa, tschatzl
author | sjohanss |
---|---|
date | Mon, 20 Jan 2014 10:55:54 +0100 |
parents | 732af649bc3a |
children |
rev | line source |
---|---|
0 | 1 /* |
11147
732af649bc3a
8017498: JVM crashes when native code calls sigaction(sig) where sig>=0x20
ccheung
parents:
1972
diff
changeset
|
2 * Copyright (c) 2001, 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 * | |
1552
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
0
diff
changeset
|
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
0
diff
changeset
|
20 * or visit www.oracle.com if you need additional information or have any |
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
0
diff
changeset
|
21 * questions. |
0 | 22 * |
23 */ | |
24 | |
25 /* CopyrightVersion 1.2 */ | |
26 | |
27 /* This is a special library that should be loaded before libc & | |
28 * libthread to interpose the signal handler installation functions: | |
29 * sigaction(), signal(), sigset(). | |
30 * Used for signal-chaining. See RFE 4381843. | |
31 */ | |
32 | |
33 #include <signal.h> | |
34 #include <dlfcn.h> | |
35 #include <pthread.h> | |
36 #include <stdio.h> | |
37 #include <stdlib.h> | |
38 | |
39 #define bool int | |
40 #define true 1 | |
41 #define false 0 | |
42 | |
43 #define MAXSIGNUM 32 | |
44 #define MASK(sig) ((unsigned int)1 << sig) | |
45 | |
46 static struct sigaction sact[MAXSIGNUM]; /* saved signal handlers */ | |
47 static unsigned int jvmsigs = 0; /* signals used by jvm */ | |
48 | |
49 /* used to synchronize the installation of signal handlers */ | |
50 static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER; | |
51 static pthread_cond_t cond = PTHREAD_COND_INITIALIZER; | |
52 static pthread_t tid = 0; | |
53 | |
54 typedef void (*sa_handler_t)(int); | |
55 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *); | |
56 typedef sa_handler_t (*signal_t)(int, sa_handler_t); | |
57 typedef int (*sigaction_t)(int, const struct sigaction *, struct sigaction *); | |
58 | |
59 static signal_t os_signal = 0; /* os's version of signal()/sigset() */ | |
60 static sigaction_t os_sigaction = 0; /* os's version of sigaction() */ | |
61 | |
62 static bool jvm_signal_installing = false; | |
63 static bool jvm_signal_installed = false; | |
64 | |
65 static void signal_lock() { | |
66 pthread_mutex_lock(&mutex); | |
67 /* When the jvm is installing its set of signal handlers, threads | |
68 * other than the jvm thread should wait */ | |
69 if (jvm_signal_installing) { | |
70 if (tid != pthread_self()) { | |
71 pthread_cond_wait(&cond, &mutex); | |
72 } | |
73 } | |
74 } | |
75 | |
76 static void signal_unlock() { | |
77 pthread_mutex_unlock(&mutex); | |
78 } | |
79 | |
80 static sa_handler_t call_os_signal(int sig, sa_handler_t disp, | |
81 bool is_sigset) { | |
82 if (os_signal == NULL) { | |
83 if (!is_sigset) { | |
84 os_signal = (signal_t)dlsym(RTLD_NEXT, "signal"); | |
85 } else { | |
86 os_signal = (signal_t)dlsym(RTLD_NEXT, "sigset"); | |
87 } | |
88 if (os_signal == NULL) { | |
89 printf("%s\n", dlerror()); | |
90 exit(0); | |
91 } | |
92 } | |
93 return (*os_signal)(sig, disp); | |
94 } | |
95 | |
96 static void save_signal_handler(int sig, sa_handler_t disp) { | |
97 sigset_t set; | |
98 sact[sig].sa_handler = disp; | |
99 sigemptyset(&set); | |
100 sact[sig].sa_mask = set; | |
101 sact[sig].sa_flags = 0; | |
102 } | |
103 | |
104 static sa_handler_t set_signal(int sig, sa_handler_t disp, bool is_sigset) { | |
105 sa_handler_t oldhandler; | |
106 bool sigused; | |
107 | |
108 signal_lock(); | |
109 | |
11147
732af649bc3a
8017498: JVM crashes when native code calls sigaction(sig) where sig>=0x20
ccheung
parents:
1972
diff
changeset
|
110 sigused = (sig < MAXSIGNUM) && ((MASK(sig) & jvmsigs) != 0); |
0 | 111 if (jvm_signal_installed && sigused) { |
112 /* jvm has installed its signal handler for this signal. */ | |
113 /* Save the handler. Don't really install it. */ | |
114 oldhandler = sact[sig].sa_handler; | |
115 save_signal_handler(sig, disp); | |
116 | |
117 signal_unlock(); | |
118 return oldhandler; | |
11147
732af649bc3a
8017498: JVM crashes when native code calls sigaction(sig) where sig>=0x20
ccheung
parents:
1972
diff
changeset
|
119 } else if (sig < MAXSIGNUM && jvm_signal_installing) { |
0 | 120 /* jvm is installing its signal handlers. Install the new |
121 * handlers and save the old ones. jvm uses sigaction(). | |
122 * Leave the piece here just in case. */ | |
123 oldhandler = call_os_signal(sig, disp, is_sigset); | |
124 save_signal_handler(sig, oldhandler); | |
125 | |
126 /* Record the signals used by jvm */ | |
127 jvmsigs |= MASK(sig); | |
128 | |
129 signal_unlock(); | |
130 return oldhandler; | |
131 } else { | |
132 /* jvm has no relation with this signal (yet). Install the | |
133 * the handler. */ | |
134 oldhandler = call_os_signal(sig, disp, is_sigset); | |
135 | |
136 signal_unlock(); | |
137 return oldhandler; | |
138 } | |
139 } | |
140 | |
141 sa_handler_t signal(int sig, sa_handler_t disp) { | |
142 return set_signal(sig, disp, false); | |
143 } | |
144 | |
145 sa_handler_t sigset(int sig, sa_handler_t disp) { | |
146 return set_signal(sig, disp, true); | |
147 } | |
148 | |
149 static int call_os_sigaction(int sig, const struct sigaction *act, | |
150 struct sigaction *oact) { | |
151 if (os_sigaction == NULL) { | |
152 os_sigaction = (sigaction_t)dlsym(RTLD_NEXT, "sigaction"); | |
153 if (os_sigaction == NULL) { | |
154 printf("%s\n", dlerror()); | |
155 exit(0); | |
156 } | |
157 } | |
158 return (*os_sigaction)(sig, act, oact); | |
159 } | |
160 | |
161 int sigaction(int sig, const struct sigaction *act, struct sigaction *oact) { | |
162 int res; | |
163 bool sigused; | |
164 struct sigaction oldAct; | |
165 | |
166 signal_lock(); | |
167 | |
11147
732af649bc3a
8017498: JVM crashes when native code calls sigaction(sig) where sig>=0x20
ccheung
parents:
1972
diff
changeset
|
168 sigused = (sig < MAXSIGNUM) && ((MASK(sig) & jvmsigs) != 0); |
0 | 169 if (jvm_signal_installed && sigused) { |
170 /* jvm has installed its signal handler for this signal. */ | |
171 /* Save the handler. Don't really install it. */ | |
172 if (oact != NULL) { | |
173 *oact = sact[sig]; | |
174 } | |
175 if (act != NULL) { | |
176 sact[sig] = *act; | |
177 } | |
178 | |
179 signal_unlock(); | |
180 return 0; | |
11147
732af649bc3a
8017498: JVM crashes when native code calls sigaction(sig) where sig>=0x20
ccheung
parents:
1972
diff
changeset
|
181 } else if (sig < MAXSIGNUM && jvm_signal_installing) { |
0 | 182 /* jvm is installing its signal handlers. Install the new |
183 * handlers and save the old ones. */ | |
184 res = call_os_sigaction(sig, act, &oldAct); | |
185 sact[sig] = oldAct; | |
186 if (oact != NULL) { | |
187 *oact = oldAct; | |
188 } | |
189 | |
190 /* Record the signals used by jvm */ | |
191 jvmsigs |= MASK(sig); | |
192 | |
193 signal_unlock(); | |
194 return res; | |
195 } else { | |
196 /* jvm has no relation with this signal (yet). Install the | |
197 * the handler. */ | |
198 res = call_os_sigaction(sig, act, oact); | |
199 | |
200 signal_unlock(); | |
201 return res; | |
202 } | |
203 } | |
204 | |
205 /* The three functions for the jvm to call into */ | |
206 void JVM_begin_signal_setting() { | |
207 signal_lock(); | |
208 jvm_signal_installing = true; | |
209 tid = pthread_self(); | |
210 signal_unlock(); | |
211 } | |
212 | |
213 void JVM_end_signal_setting() { | |
214 signal_lock(); | |
215 jvm_signal_installed = true; | |
216 jvm_signal_installing = false; | |
217 pthread_cond_broadcast(&cond); | |
218 signal_unlock(); | |
219 } | |
220 | |
221 struct sigaction *JVM_get_signal_action(int sig) { | |
222 /* Does race condition make sense here? */ | |
223 if ((MASK(sig) & jvmsigs) != 0) { | |
224 return &sact[sig]; | |
225 } | |
226 return NULL; | |
227 } |