12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
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 /* This is a special library that should be loaded before libc &
27 * libthread to interpose the signal handler installation functions:
28 * sigaction(), signal(), sigset().
29 * Used for signal-chaining. See RFE 4381843.
30 */
31
32 #include <dlfcn.h>
33 #include <errno.h>
34 #include <pthread.h>
35 #include <signal.h>
36 #include <stdio.h>
37 #include <stdlib.h>
38 #include <string.h>
39
40 #if (__STDC_VERSION__ >= 199901L)
41 #include <stdbool.h>
42 #else
43 #define bool int
44 #define true 1
45 #define false 0
46 #endif
47
48 #ifdef SOLARIS
49 #define MAX_SIGNALS (SIGRTMAX+1)
50
51 /* On solaris, MAX_SIGNALS is a macro, not a constant, so we must allocate sact dynamically. */
191 * handlers and save the old ones. jvm uses sigaction().
192 * Leave the piece here just in case. */
193 oldhandler = call_os_signal(sig, disp, is_sigset);
194 save_signal_handler(sig, oldhandler, is_sigset);
195
196 /* Record the signals used by jvm */
197 sigaddset(&jvmsigs, sig);
198
199 signal_unlock();
200 return oldhandler;
201 } else {
202 /* jvm has no relation with this signal (yet). Install the
203 * the handler. */
204 oldhandler = call_os_signal(sig, disp, is_sigset);
205
206 signal_unlock();
207 return oldhandler;
208 }
209 }
210
211 sa_handler_t signal(int sig, sa_handler_t disp) {
212 if (sig < 0 || sig >= MAX_SIGNALS) {
213 errno = EINVAL;
214 return SIG_ERR;
215 }
216
217 return set_signal(sig, disp, false);
218 }
219
220 sa_handler_t sigset(int sig, sa_handler_t disp) {
221 #ifdef _ALLBSD_SOURCE
222 printf("sigset() is not supported by BSD");
223 exit(0);
224 #else
225 if (sig < 0 || sig >= MAX_SIGNALS) {
226 errno = EINVAL;
227 return (sa_handler_t)-1;
228 }
229
230 return set_signal(sig, disp, true);
231 #endif
232 }
233
234 static int call_os_sigaction(int sig, const struct sigaction *act,
235 struct sigaction *oact) {
236 if (os_sigaction == NULL) {
237 os_sigaction = (sigaction_t)dlsym(RTLD_NEXT, "sigaction");
238 if (os_sigaction == NULL) {
239 printf("%s\n", dlerror());
240 exit(0);
241 }
242 }
243 return (*os_sigaction)(sig, act, oact);
244 }
245
246 int sigaction(int sig, const struct sigaction *act, struct sigaction *oact) {
247 int res;
248 bool sigused;
249 struct sigaction oldAct;
250
251 if (sig < 0 || sig >= MAX_SIGNALS) {
252 errno = EINVAL;
253 return -1;
254 }
255
256 #ifdef MACOSX
257 if (reentry) {
258 return call_os_sigaction(sig, act, oact);
259 }
260 #endif
261
262 signal_lock();
263
264 allocate_sact();
265 sigused = sigismember(&jvmsigs, sig);
266 if (jvm_signal_installed && sigused) {
|
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
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 /* This is a special library that should be loaded before libc &
27 * libthread to interpose the signal handler installation functions:
28 * sigaction(), signal(), sigset().
29 * Used for signal-chaining. See RFE 4381843.
30 */
31
32 #include "jni.h"
33
34 #ifdef SOLARIS
35 /* Our redeclarations of the system functions must not have a less
36 * restrictive linker scoping, so we have to declare them as JNIEXPORT
37 * before including signal.h */
38 #include "sys/signal.h"
39 JNIEXPORT void (*signal(int sig, void (*disp)(int)))(int);
40 JNIEXPORT void (*sigset(int sig, void (*disp)(int)))(int);
41 JNIEXPORT int sigaction(int sig, const struct sigaction *act, struct sigaction *oact);
42 #endif
43
44 #include <dlfcn.h>
45 #include <errno.h>
46 #include <pthread.h>
47 #include <signal.h>
48 #include <stdio.h>
49 #include <stdlib.h>
50 #include <string.h>
51
52 #if (__STDC_VERSION__ >= 199901L)
53 #include <stdbool.h>
54 #else
55 #define bool int
56 #define true 1
57 #define false 0
58 #endif
59
60 #ifdef SOLARIS
61 #define MAX_SIGNALS (SIGRTMAX+1)
62
63 /* On solaris, MAX_SIGNALS is a macro, not a constant, so we must allocate sact dynamically. */
203 * handlers and save the old ones. jvm uses sigaction().
204 * Leave the piece here just in case. */
205 oldhandler = call_os_signal(sig, disp, is_sigset);
206 save_signal_handler(sig, oldhandler, is_sigset);
207
208 /* Record the signals used by jvm */
209 sigaddset(&jvmsigs, sig);
210
211 signal_unlock();
212 return oldhandler;
213 } else {
214 /* jvm has no relation with this signal (yet). Install the
215 * the handler. */
216 oldhandler = call_os_signal(sig, disp, is_sigset);
217
218 signal_unlock();
219 return oldhandler;
220 }
221 }
222
223 JNIEXPORT sa_handler_t signal(int sig, sa_handler_t disp) {
224 if (sig < 0 || sig >= MAX_SIGNALS) {
225 errno = EINVAL;
226 return SIG_ERR;
227 }
228
229 return set_signal(sig, disp, false);
230 }
231
232 JNIEXPORT sa_handler_t sigset(int sig, sa_handler_t disp) {
233 #ifdef _ALLBSD_SOURCE
234 printf("sigset() is not supported by BSD");
235 exit(0);
236 #else
237 if (sig < 0 || sig >= MAX_SIGNALS) {
238 errno = EINVAL;
239 return (sa_handler_t)-1;
240 }
241
242 return set_signal(sig, disp, true);
243 #endif
244 }
245
246 static int call_os_sigaction(int sig, const struct sigaction *act,
247 struct sigaction *oact) {
248 if (os_sigaction == NULL) {
249 os_sigaction = (sigaction_t)dlsym(RTLD_NEXT, "sigaction");
250 if (os_sigaction == NULL) {
251 printf("%s\n", dlerror());
252 exit(0);
253 }
254 }
255 return (*os_sigaction)(sig, act, oact);
256 }
257
258 JNIEXPORT int sigaction(int sig, const struct sigaction *act, struct sigaction *oact) {
259 int res;
260 bool sigused;
261 struct sigaction oldAct;
262
263 if (sig < 0 || sig >= MAX_SIGNALS) {
264 errno = EINVAL;
265 return -1;
266 }
267
268 #ifdef MACOSX
269 if (reentry) {
270 return call_os_sigaction(sig, act, oact);
271 }
272 #endif
273
274 signal_lock();
275
276 allocate_sact();
277 sigused = sigismember(&jvmsigs, sig);
278 if (jvm_signal_installed && sigused) {
|