20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 *
24 */
25
26 /* CopyrightVersion 1.2 */
27
28 /* This is a special library that should be loaded before libc &
29 * libthread to interpose the signal handler installation functions:
30 * sigaction(), signal(), sigset().
31 * Used for signal-chaining. See RFE 4381843.
32 */
33
34 #include <signal.h>
35 #include <dlfcn.h>
36 #include <pthread.h>
37 #include <stdio.h>
38 #include <stdlib.h>
39 #include <stdint.h>
40
41 #define bool int
42 #define true 1
43 #define false 0
44
45 static struct sigaction sact[NSIG]; /* saved signal handlers */
46 static sigset_t jvmsigs; /* Signals used by jvm. */
47
48 /* Used to synchronize the installation of signal handlers. */
49 static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
50 static pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
51 static pthread_t tid = 0;
52
53 typedef void (*sa_handler_t)(int);
54 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
55 // signal_t is already defined on AIX.
56 typedef sa_handler_t (*signal_like_function_t)(int, sa_handler_t);
57 typedef int (*sigaction_t)(int, const struct sigaction *, struct sigaction *);
58
59 static signal_like_function_t os_signal = 0; /* os's version of signal()/sigset() */
123 * handlers and save the old ones. jvm uses sigaction().
124 * Leave the piece here just in case. */
125 oldhandler = call_os_signal(sig, disp, is_sigset);
126 save_signal_handler(sig, oldhandler);
127
128 /* Record the signals used by jvm */
129 sigaddset(&jvmsigs, sig);
130
131 signal_unlock();
132 return oldhandler;
133 } else {
134 /* jvm has no relation with this signal (yet). Install the
135 * the handler. */
136 oldhandler = call_os_signal(sig, disp, is_sigset);
137
138 signal_unlock();
139 return oldhandler;
140 }
141 }
142
143 sa_handler_t signal(int sig, sa_handler_t disp) {
144 return set_signal(sig, disp, false);
145 }
146
147 sa_handler_t sigset(int sig, sa_handler_t disp) {
148 return set_signal(sig, disp, true);
149 }
150
151 static int call_os_sigaction(int sig, const struct sigaction *act,
152 struct sigaction *oact) {
153 if (os_sigaction == NULL) {
154 // Aix: call functions directly instead of dlsym'ing them.
155 os_sigaction = sigaction;
156 if (os_sigaction == NULL) {
157 printf("%s\n", dlerror());
158 exit(0);
159 }
160 }
161 return (*os_sigaction)(sig, act, oact);
162 }
163
164 int sigaction(int sig, const struct sigaction *act, struct sigaction *oact) {
165 int res;
166 bool sigused;
167 struct sigaction oldAct;
168
169 signal_lock();
170
171 sigused = sigismember(&jvmsigs, sig);
172 if (jvm_signal_installed && sigused) {
173 /* jvm has installed its signal handler for this signal. */
174 /* Save the handler. Don't really install it. */
175 if (oact != NULL) {
176 *oact = sact[sig];
177 }
178 if (act != NULL) {
179 sact[sig] = *act;
180 }
181
182 signal_unlock();
183 return 0;
184 } else if (jvm_signal_installing) {
189 if (oact != NULL) {
190 *oact = oldAct;
191 }
192
193 /* Record the signals used by jvm. */
194 sigaddset(&jvmsigs, sig);
195
196 signal_unlock();
197 return res;
198 } else {
199 /* jvm has no relation with this signal (yet). Install the
200 * the handler. */
201 res = call_os_sigaction(sig, act, oact);
202
203 signal_unlock();
204 return res;
205 }
206 }
207
208 /* The three functions for the jvm to call into. */
209 void JVM_begin_signal_setting() {
210 signal_lock();
211 sigemptyset(&jvmsigs);
212 jvm_signal_installing = true;
213 tid = pthread_self();
214 signal_unlock();
215 }
216
217 void JVM_end_signal_setting() {
218 signal_lock();
219 jvm_signal_installed = true;
220 jvm_signal_installing = false;
221 pthread_cond_broadcast(&cond);
222 signal_unlock();
223 }
224
225 struct sigaction *JVM_get_signal_action(int sig) {
226 /* Does race condition make sense here? */
227 if (sigismember(&jvmsigs, sig)) {
228 return &sact[sig];
229 }
230 return NULL;
231 }
|
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 *
24 */
25
26 /* CopyrightVersion 1.2 */
27
28 /* This is a special library that should be loaded before libc &
29 * libthread to interpose the signal handler installation functions:
30 * sigaction(), signal(), sigset().
31 * Used for signal-chaining. See RFE 4381843.
32 */
33
34 #include <signal.h>
35 #include <dlfcn.h>
36 #include <pthread.h>
37 #include <stdio.h>
38 #include <stdlib.h>
39 #include <stdint.h>
40 #include "jni.h"
41
42 #define bool int
43 #define true 1
44 #define false 0
45
46 static struct sigaction sact[NSIG]; /* saved signal handlers */
47 static sigset_t jvmsigs; /* 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 // signal_t is already defined on AIX.
57 typedef sa_handler_t (*signal_like_function_t)(int, sa_handler_t);
58 typedef int (*sigaction_t)(int, const struct sigaction *, struct sigaction *);
59
60 static signal_like_function_t os_signal = 0; /* os's version of signal()/sigset() */
124 * handlers and save the old ones. jvm uses sigaction().
125 * Leave the piece here just in case. */
126 oldhandler = call_os_signal(sig, disp, is_sigset);
127 save_signal_handler(sig, oldhandler);
128
129 /* Record the signals used by jvm */
130 sigaddset(&jvmsigs, sig);
131
132 signal_unlock();
133 return oldhandler;
134 } else {
135 /* jvm has no relation with this signal (yet). Install the
136 * the handler. */
137 oldhandler = call_os_signal(sig, disp, is_sigset);
138
139 signal_unlock();
140 return oldhandler;
141 }
142 }
143
144 JNIEXPORT sa_handler_t JNICALL
145 signal(int sig, sa_handler_t disp) {
146 return set_signal(sig, disp, false);
147 }
148
149 JNIEXPORT sa_handler_t JNICALL
150 sigset(int sig, sa_handler_t disp) {
151 return set_signal(sig, disp, true);
152 }
153
154 static int call_os_sigaction(int sig, const struct sigaction *act,
155 struct sigaction *oact) {
156 if (os_sigaction == NULL) {
157 // Aix: call functions directly instead of dlsym'ing them.
158 os_sigaction = sigaction;
159 if (os_sigaction == NULL) {
160 printf("%s\n", dlerror());
161 exit(0);
162 }
163 }
164 return (*os_sigaction)(sig, act, oact);
165 }
166
167 JNIEXPORT int JNICALL
168 sigaction(int sig, const struct sigaction *act, struct sigaction *oact) {
169 int res;
170 bool sigused;
171 struct sigaction oldAct;
172
173 signal_lock();
174
175 sigused = sigismember(&jvmsigs, sig);
176 if (jvm_signal_installed && sigused) {
177 /* jvm has installed its signal handler for this signal. */
178 /* Save the handler. Don't really install it. */
179 if (oact != NULL) {
180 *oact = sact[sig];
181 }
182 if (act != NULL) {
183 sact[sig] = *act;
184 }
185
186 signal_unlock();
187 return 0;
188 } else if (jvm_signal_installing) {
193 if (oact != NULL) {
194 *oact = oldAct;
195 }
196
197 /* Record the signals used by jvm. */
198 sigaddset(&jvmsigs, sig);
199
200 signal_unlock();
201 return res;
202 } else {
203 /* jvm has no relation with this signal (yet). Install the
204 * the handler. */
205 res = call_os_sigaction(sig, act, oact);
206
207 signal_unlock();
208 return res;
209 }
210 }
211
212 /* The three functions for the jvm to call into. */
213 JNIEXPORT void JNICALL
214 JVM_begin_signal_setting() {
215 signal_lock();
216 sigemptyset(&jvmsigs);
217 jvm_signal_installing = true;
218 tid = pthread_self();
219 signal_unlock();
220 }
221
222 JNIEXPORT void JNICALL
223 JVM_end_signal_setting() {
224 signal_lock();
225 jvm_signal_installed = true;
226 jvm_signal_installing = false;
227 pthread_cond_broadcast(&cond);
228 signal_unlock();
229 }
230
231 JNIEXPORT struct sigaction * JNICALL
232 JVM_get_signal_action(int sig) {
233 /* Does race condition make sense here? */
234 if (sigismember(&jvmsigs, sig)) {
235 return &sact[sig];
236 }
237 return NULL;
238 }
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