56 ReduceSignalUsage is set, in which case the user is allowed to set
57 his own _native_ handler for this signal; thus, in either case,
58 we do not allow JVM_RegisterSignal to change the handler. */
59 case BREAK_SIGNAL:
60 return (void *)-1;
61
62 /* The following signals are used for Shutdown Hooks support. However, if
63 ReduceSignalUsage (-Xrs) is set, Shutdown Hooks must be invoked via
64 System.exit(), Java is not allowed to use these signals, and the the
65 user is allowed to set his own _native_ handler for these signals and
66 invoke System.exit() as needed. Terminator.setup() is avoiding
67 registration of these signals when -Xrs is present.
68 - If the HUP signal is ignored (from the nohup) command, then Java
69 is not allowed to use this signal.
70 */
71
72 case SHUTDOWN1_SIGNAL:
73 case SHUTDOWN2_SIGNAL:
74 case SHUTDOWN3_SIGNAL:
75 if (ReduceSignalUsage) return (void*)-1;
76 if (os::Linux::is_sig_ignored(sig)) return (void*)1;
77 }
78
79 void* oldHandler = os::signal(sig, newHandler);
80 if (oldHandler == os::user_handler()) {
81 return (void *)2;
82 } else {
83 return oldHandler;
84 }
85 JVM_END
86
87
88 JVM_ENTRY_NO_ENV(jboolean, JVM_RaiseSignal(jint sig))
89 if (ReduceSignalUsage) {
90 // do not allow SHUTDOWN1_SIGNAL,SHUTDOWN2_SIGNAL,SHUTDOWN3_SIGNAL,
91 // BREAK_SIGNAL to be raised when ReduceSignalUsage is set, since
92 // no handler for them is actually registered in JVM or via
93 // JVM_RegisterSignal.
94 if (sig == SHUTDOWN1_SIGNAL || sig == SHUTDOWN2_SIGNAL ||
95 sig == SHUTDOWN3_SIGNAL || sig == BREAK_SIGNAL) {
96 return JNI_FALSE;
97 }
98 }
99 else if ((sig == SHUTDOWN1_SIGNAL || sig == SHUTDOWN2_SIGNAL ||
100 sig == SHUTDOWN3_SIGNAL) && os::Linux::is_sig_ignored(sig)) {
101 // do not allow SHUTDOWN1_SIGNAL to be raised when SHUTDOWN1_SIGNAL
102 // is ignored, since no handler for them is actually registered in JVM
103 // or via JVM_RegisterSignal.
104 // This also applies for SHUTDOWN2_SIGNAL and SHUTDOWN3_SIGNAL
105 return JNI_FALSE;
106 }
107
108 os::signal_raise(sig);
109 return JNI_TRUE;
110 JVM_END
111
112 /*
113 All the defined signal names for Linux.
114
115 NOTE that not all of these names are accepted by our Java implementation
116
117 Via an existing claim by the VM, sigaction restrictions, or
118 the "rules of Unix" some of these names will be rejected at runtime.
119 For example the VM sets up to handle USR1, sigaction returns EINVAL for
120 STOP, and Linux simply doesn't allow catching of KILL.
121
122 Here are the names currently accepted by a user of sun.misc.Signal with
123 1.4.1 (ignoring potential interaction with use of chaining, etc):
124
125 HUP, INT, TRAP, ABRT, IOT, BUS, USR2, PIPE, ALRM, TERM, STKFLT,
126 CLD, CHLD, CONT, TSTP, TTIN, TTOU, URG, XCPU, XFSZ, VTALRM, PROF,
127 WINCH, POLL, IO, PWR, SYS
128
129 */
130
131 struct siglabel {
132 const char *name;
133 int number;
134 };
135
136 struct siglabel siglabels[] = {
137 /* derived from /usr/include/bits/signum.h on RH7.2 */
138 "HUP", SIGHUP, /* Hangup (POSIX). */
139 "INT", SIGINT, /* Interrupt (ANSI). */
140 "QUIT", SIGQUIT, /* Quit (POSIX). */
141 "ILL", SIGILL, /* Illegal instruction (ANSI). */
142 "TRAP", SIGTRAP, /* Trace trap (POSIX). */
143 "ABRT", SIGABRT, /* Abort (ANSI). */
144 "IOT", SIGIOT, /* IOT trap (4.2 BSD). */
145 "BUS", SIGBUS, /* BUS error (4.2 BSD). */
146 "FPE", SIGFPE, /* Floating-point exception (ANSI). */
147 "KILL", SIGKILL, /* Kill, unblockable (POSIX). */
148 "USR1", SIGUSR1, /* User-defined signal 1 (POSIX). */
149 "SEGV", SIGSEGV, /* Segmentation violation (ANSI). */
150 "USR2", SIGUSR2, /* User-defined signal 2 (POSIX). */
151 "PIPE", SIGPIPE, /* Broken pipe (POSIX). */
152 "ALRM", SIGALRM, /* Alarm clock (POSIX). */
153 "TERM", SIGTERM, /* Termination (ANSI). */
154 #ifdef SIGSTKFLT
155 "STKFLT", SIGSTKFLT, /* Stack fault. */
156 #endif
157 "CLD", SIGCLD, /* Same as SIGCHLD (System V). */
158 "CHLD", SIGCHLD, /* Child status has changed (POSIX). */
159 "CONT", SIGCONT, /* Continue (POSIX). */
160 "STOP", SIGSTOP, /* Stop, unblockable (POSIX). */
161 "TSTP", SIGTSTP, /* Keyboard stop (POSIX). */
162 "TTIN", SIGTTIN, /* Background read from tty (POSIX). */
163 "TTOU", SIGTTOU, /* Background write to tty (POSIX). */
164 "URG", SIGURG, /* Urgent condition on socket (4.2 BSD). */
165 "XCPU", SIGXCPU, /* CPU limit exceeded (4.2 BSD). */
166 "XFSZ", SIGXFSZ, /* File size limit exceeded (4.2 BSD). */
167 "VTALRM", SIGVTALRM, /* Virtual alarm clock (4.2 BSD). */
168 "PROF", SIGPROF, /* Profiling alarm clock (4.2 BSD). */
169 "WINCH", SIGWINCH, /* Window size change (4.3 BSD, Sun). */
170 "POLL", SIGPOLL, /* Pollable event occurred (System V). */
171 "IO", SIGIO, /* I/O now possible (4.2 BSD). */
172 "PWR", SIGPWR, /* Power failure restart (System V). */
173 #ifdef SIGSYS
174 "SYS", SIGSYS /* Bad system call. Only on some Linuxen! */
175 #endif
176 };
177
178 JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name))
179
180 /* find and return the named signal's number */
181
182 for(uint i=0; i<ARRAY_SIZE(siglabels); i++)
183 if(!strcmp(name, siglabels[i].name))
184 return siglabels[i].number;
185
186 return -1;
187
188 JVM_END
189
190 // used by os::exception_name()
191 extern bool signal_name(int signo, char* buf, size_t len) {
192 for(uint i = 0; i < ARRAY_SIZE(siglabels); i++) {
193 if (signo == siglabels[i].number) {
194 jio_snprintf(buf, len, "SIG%s", siglabels[i].name);
195 return true;
|
56 ReduceSignalUsage is set, in which case the user is allowed to set
57 his own _native_ handler for this signal; thus, in either case,
58 we do not allow JVM_RegisterSignal to change the handler. */
59 case BREAK_SIGNAL:
60 return (void *)-1;
61
62 /* The following signals are used for Shutdown Hooks support. However, if
63 ReduceSignalUsage (-Xrs) is set, Shutdown Hooks must be invoked via
64 System.exit(), Java is not allowed to use these signals, and the the
65 user is allowed to set his own _native_ handler for these signals and
66 invoke System.exit() as needed. Terminator.setup() is avoiding
67 registration of these signals when -Xrs is present.
68 - If the HUP signal is ignored (from the nohup) command, then Java
69 is not allowed to use this signal.
70 */
71
72 case SHUTDOWN1_SIGNAL:
73 case SHUTDOWN2_SIGNAL:
74 case SHUTDOWN3_SIGNAL:
75 if (ReduceSignalUsage) return (void*)-1;
76 if (os::Bsd::is_sig_ignored(sig)) return (void*)1;
77 }
78
79 void* oldHandler = os::signal(sig, newHandler);
80 if (oldHandler == os::user_handler()) {
81 return (void *)2;
82 } else {
83 return oldHandler;
84 }
85 JVM_END
86
87
88 JVM_ENTRY_NO_ENV(jboolean, JVM_RaiseSignal(jint sig))
89 if (ReduceSignalUsage) {
90 // do not allow SHUTDOWN1_SIGNAL,SHUTDOWN2_SIGNAL,SHUTDOWN3_SIGNAL,
91 // BREAK_SIGNAL to be raised when ReduceSignalUsage is set, since
92 // no handler for them is actually registered in JVM or via
93 // JVM_RegisterSignal.
94 if (sig == SHUTDOWN1_SIGNAL || sig == SHUTDOWN2_SIGNAL ||
95 sig == SHUTDOWN3_SIGNAL || sig == BREAK_SIGNAL) {
96 return JNI_FALSE;
97 }
98 }
99 else if ((sig == SHUTDOWN1_SIGNAL || sig == SHUTDOWN2_SIGNAL ||
100 sig == SHUTDOWN3_SIGNAL) && os::Bsd::is_sig_ignored(sig)) {
101 // do not allow SHUTDOWN1_SIGNAL to be raised when SHUTDOWN1_SIGNAL
102 // is ignored, since no handler for them is actually registered in JVM
103 // or via JVM_RegisterSignal.
104 // This also applies for SHUTDOWN2_SIGNAL and SHUTDOWN3_SIGNAL
105 return JNI_FALSE;
106 }
107
108 os::signal_raise(sig);
109 return JNI_TRUE;
110 JVM_END
111
112 /*
113 All the defined signal names for Bsd.
114
115 NOTE that not all of these names are accepted by our Java implementation
116
117 Via an existing claim by the VM, sigaction restrictions, or
118 the "rules of Unix" some of these names will be rejected at runtime.
119 For example the VM sets up to handle USR1, sigaction returns EINVAL for
120 STOP, and Bsd simply doesn't allow catching of KILL.
121
122 Here are the names currently accepted by a user of sun.misc.Signal with
123 1.4.1 (ignoring potential interaction with use of chaining, etc):
124
125 HUP, INT, TRAP, ABRT, IOT, BUS, USR2, PIPE, ALRM, TERM, STKFLT,
126 CLD, CHLD, CONT, TSTP, TTIN, TTOU, URG, XCPU, XFSZ, VTALRM, PROF,
127 WINCH, POLL, IO, PWR, SYS
128
129 */
130
131 struct siglabel {
132 const char *name;
133 int number;
134 };
135
136 struct siglabel siglabels[] = {
137 /* derived from /usr/include/bits/signum.h on RH7.2 */
138 "HUP", SIGHUP, /* Hangup (POSIX). */
139 "INT", SIGINT, /* Interrupt (ANSI). */
140 "QUIT", SIGQUIT, /* Quit (POSIX). */
141 "ILL", SIGILL, /* Illegal instruction (ANSI). */
142 "TRAP", SIGTRAP, /* Trace trap (POSIX). */
143 "ABRT", SIGABRT, /* Abort (ANSI). */
144 "EMT", SIGEMT, /* EMT trap */
145 "FPE", SIGFPE, /* Floating-point exception (ANSI). */
146 "KILL", SIGKILL, /* Kill, unblockable (POSIX). */
147 "BUS", SIGBUS, /* BUS error (4.2 BSD). */
148 "SEGV", SIGSEGV, /* Segmentation violation (ANSI). */
149 "SYS", SIGSYS, /* Bad system call. Only on some Bsden! */
150 "PIPE", SIGPIPE, /* Broken pipe (POSIX). */
151 "ALRM", SIGALRM, /* Alarm clock (POSIX). */
152 "TERM", SIGTERM, /* Termination (ANSI). */
153 "URG", SIGURG, /* Urgent condition on socket (4.2 BSD). */
154 "STOP", SIGSTOP, /* Stop, unblockable (POSIX). */
155 "TSTP", SIGTSTP, /* Keyboard stop (POSIX). */
156 "CONT", SIGCONT, /* Continue (POSIX). */
157 "CHLD", SIGCHLD, /* Child status has changed (POSIX). */
158 "TTIN", SIGTTIN, /* Background read from tty (POSIX). */
159 "TTOU", SIGTTOU, /* Background write to tty (POSIX). */
160 "IO", SIGIO, /* I/O now possible (4.2 BSD). */
161 "XCPU", SIGXCPU, /* CPU limit exceeded (4.2 BSD). */
162 "XFSZ", SIGXFSZ, /* File size limit exceeded (4.2 BSD). */
163 "VTALRM", SIGVTALRM, /* Virtual alarm clock (4.2 BSD). */
164 "PROF", SIGPROF, /* Profiling alarm clock (4.2 BSD). */
165 "WINCH", SIGWINCH, /* Window size change (4.3 BSD, Sun). */
166 "INFO", SIGINFO, /* Information request. */
167 "USR1", SIGUSR1, /* User-defined signal 1 (POSIX). */
168 "USR2", SIGUSR2 /* User-defined signal 2 (POSIX). */
169 };
170
171 JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name))
172
173 /* find and return the named signal's number */
174
175 for(uint i=0; i<ARRAY_SIZE(siglabels); i++)
176 if(!strcmp(name, siglabels[i].name))
177 return siglabels[i].number;
178
179 return -1;
180
181 JVM_END
182
183 // used by os::exception_name()
184 extern bool signal_name(int signo, char* buf, size_t len) {
185 for(uint i = 0; i < ARRAY_SIZE(siglabels); i++) {
186 if (signo == siglabels[i].number) {
187 jio_snprintf(buf, len, "SIG%s", siglabels[i].name);
188 return true;
|