]>
Commit | Line | Data |
---|---|---|
6bac11d9 | 1 | /* Copyright (C) 1991, 92, 93, 94, 95, 96, 97 Free Software Foundation, Inc. |
2c6fe0bd | 2 | This file is part of the GNU C Library. |
28f540f4 | 3 | |
2c6fe0bd UD |
4 | The GNU C Library is free software; you can redistribute it and/or |
5 | modify it under the terms of the GNU Library General Public License as | |
6 | published by the Free Software Foundation; either version 2 of the | |
7 | License, or (at your option) any later version. | |
28f540f4 | 8 | |
2c6fe0bd UD |
9 | The GNU C Library is distributed in the hope that it will be useful, |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
12 | Library General Public License for more details. | |
28f540f4 | 13 | |
2c6fe0bd UD |
14 | You should have received a copy of the GNU Library General Public |
15 | License along with the GNU C Library; see the file COPYING.LIB. If not, | |
16 | write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
17 | Boston, MA 02111-1307, USA. */ | |
28f540f4 RM |
18 | |
19 | #include <stdlib.h> | |
20 | #include <stdio.h> | |
21 | #include <hurd.h> | |
22 | #include <hurd/signal.h> | |
23 | #include <cthreads.h> /* For `struct mutex'. */ | |
24 | #include <string.h> | |
762a2918 | 25 | #include <hurd/id.h> |
28f540f4 RM |
26 | #include "hurdfault.h" |
27 | #include "hurdmalloc.h" /* XXX */ | |
28 | ||
29 | const char *_hurdsig_getenv (const char *); | |
30 | ||
31 | struct mutex _hurd_siglock; | |
32 | int _hurd_stopped; | |
33 | ||
34 | /* Port that receives signals and other miscellaneous messages. */ | |
35 | mach_port_t _hurd_msgport; | |
36 | ||
37 | /* Thread listening on it. */ | |
38 | thread_t _hurd_msgport_thread; | |
39 | ||
40 | /* Thread which receives task-global signals. */ | |
41 | thread_t _hurd_sigthread; | |
42 | ||
6bac11d9 MB |
43 | /* These are set up by _hurdsig_init. */ |
44 | unsigned long int __hurd_sigthread_stack_base; | |
45 | unsigned long int __hurd_sigthread_stack_end; | |
46 | unsigned long int *__hurd_sigthread_variables; | |
47 | ||
28f540f4 RM |
48 | /* Linked-list of per-thread signal state. */ |
49 | struct hurd_sigstate *_hurd_sigstates; | |
54da5be3 RM |
50 | |
51 | /* Timeout for RPC's after interrupt_operation. */ | |
52 | mach_msg_timeout_t _hurd_interrupted_rpc_timeout = 3000; | |
28f540f4 RM |
53 | \f |
54 | static void | |
55 | default_sigaction (struct sigaction actions[NSIG]) | |
56 | { | |
57 | int signo; | |
58 | ||
59 | __sigemptyset (&actions[0].sa_mask); | |
60 | actions[0].sa_flags = SA_RESTART; | |
61 | actions[0].sa_handler = SIG_DFL; | |
62 | ||
63 | for (signo = 1; signo < NSIG; ++signo) | |
64 | actions[signo] = actions[0]; | |
65 | } | |
66 | ||
67 | struct hurd_sigstate * | |
68 | _hurd_thread_sigstate (thread_t thread) | |
69 | { | |
70 | struct hurd_sigstate *ss; | |
71 | __mutex_lock (&_hurd_siglock); | |
72 | for (ss = _hurd_sigstates; ss != NULL; ss = ss->next) | |
73 | if (ss->thread == thread) | |
b96bdcd7 | 74 | break; |
28f540f4 RM |
75 | if (ss == NULL) |
76 | { | |
77 | ss = malloc (sizeof (*ss)); | |
78 | if (ss == NULL) | |
79 | __libc_fatal ("hurd: Can't allocate thread sigstate\n"); | |
80 | ss->thread = thread; | |
81 | __spin_lock_init (&ss->lock); | |
82 | ||
6df1b247 | 83 | /* Initialize default state. */ |
28f540f4 RM |
84 | __sigemptyset (&ss->blocked); |
85 | __sigemptyset (&ss->pending); | |
86 | memset (&ss->sigaltstack, 0, sizeof (ss->sigaltstack)); | |
10dc2a90 | 87 | ss->preemptors = NULL; |
28f540f4 | 88 | ss->suspended = 0; |
28f540f4 RM |
89 | ss->intr_port = MACH_PORT_NULL; |
90 | ss->context = NULL; | |
91 | ||
92 | /* Initialize the sigaction vector from the default signal receiving | |
93 | thread's state, and its from the system defaults. */ | |
94 | if (thread == _hurd_sigthread) | |
95 | default_sigaction (ss->actions); | |
96 | else | |
97 | { | |
98 | struct hurd_sigstate *s; | |
99 | for (s = _hurd_sigstates; s != NULL; s = s->next) | |
100 | if (s->thread == _hurd_sigthread) | |
101 | break; | |
102 | if (s) | |
103 | { | |
104 | __spin_lock (&s->lock); | |
105 | memcpy (ss->actions, s->actions, sizeof (s->actions)); | |
106 | __spin_unlock (&s->lock); | |
107 | } | |
108 | else | |
109 | default_sigaction (ss->actions); | |
110 | } | |
111 | ||
112 | ss->next = _hurd_sigstates; | |
113 | _hurd_sigstates = ss; | |
114 | } | |
115 | __mutex_unlock (&_hurd_siglock); | |
116 | return ss; | |
117 | } | |
118 | \f | |
119 | /* Signal delivery itself is on this page. */ | |
120 | ||
121 | #include <hurd/fd.h> | |
9fd18b6c | 122 | #include <hurd/crash.h> |
28f540f4 RM |
123 | #include <hurd/paths.h> |
124 | #include <setjmp.h> | |
125 | #include <fcntl.h> | |
126 | #include <sys/wait.h> | |
127 | #include "thread_state.h" | |
128 | #include <hurd/msg_server.h> | |
129 | #include <hurd/msg_reply.h> /* For __msg_sig_post_reply. */ | |
28f540f4 | 130 | #include <hurd/interrupt.h> |
fb8e70d6 RM |
131 | #include <assert.h> |
132 | #include <unistd.h> | |
28f540f4 RM |
133 | |
134 | int _hurd_core_limit; /* XXX */ | |
135 | ||
9fd18b6c | 136 | /* Call the crash dump server to mummify us before we die. |
28f540f4 RM |
137 | Returns nonzero if a core file was written. */ |
138 | static int | |
0e3426bb | 139 | write_corefile (int signo, const struct hurd_signal_detail *detail) |
28f540f4 RM |
140 | { |
141 | error_t err; | |
142 | mach_port_t coreserver; | |
143 | file_t file, coredir; | |
144 | const char *name; | |
145 | ||
146 | /* XXX RLIMIT_CORE: | |
147 | When we have a protocol to make the server return an error | |
148 | for RLIMIT_FSIZE, then tell the corefile fs server the RLIMIT_CORE | |
149 | value in place of the RLIMIT_FSIZE value. */ | |
150 | ||
151 | /* First get a port to the core dumping server. */ | |
152 | coreserver = MACH_PORT_NULL; | |
9fd18b6c | 153 | name = _hurdsig_getenv ("CRASHSERVER"); |
28f540f4 RM |
154 | if (name != NULL) |
155 | coreserver = __file_name_lookup (name, 0, 0); | |
156 | if (coreserver == MACH_PORT_NULL) | |
9fd18b6c | 157 | coreserver = __file_name_lookup (_SERVERS_CRASH, 0, 0); |
28f540f4 RM |
158 | if (coreserver == MACH_PORT_NULL) |
159 | return 0; | |
160 | ||
161 | /* Get a port to the directory where the new core file will reside. */ | |
78abf563 | 162 | file = MACH_PORT_NULL; |
28f540f4 RM |
163 | name = _hurdsig_getenv ("COREFILE"); |
164 | if (name == NULL) | |
165 | name = "core"; | |
166 | coredir = __file_name_split (name, (char **) &name); | |
78abf563 TBB |
167 | if (coredir != MACH_PORT_NULL) |
168 | /* Create the new file, but don't link it into the directory yet. */ | |
169 | __dir_mkfile (coredir, O_WRONLY|O_CREAT, | |
170 | 0600 & ~_hurd_umask, /* XXX ? */ | |
0f110f41 | 171 | &file); |
28f540f4 RM |
172 | |
173 | /* Call the core dumping server to write the core file. */ | |
9fd18b6c RM |
174 | err = __crash_dump_task (coreserver, |
175 | __mach_task_self (), | |
0e3426bb RM |
176 | file, |
177 | signo, detail->code, detail->error, | |
178 | detail->exc, detail->exc_code, detail->exc_subcode, | |
179 | _hurd_ports[INIT_PORT_CTTYID].port, | |
180 | MACH_MSG_TYPE_COPY_SEND); | |
28f540f4 | 181 | __mach_port_deallocate (__mach_task_self (), coreserver); |
78abf563 TBB |
182 | |
183 | if (! err && file != MACH_PORT_NULL) | |
28f540f4 RM |
184 | /* The core dump into FILE succeeded, so now link it into the |
185 | directory. */ | |
0e3426bb | 186 | err = __dir_link (file, coredir, name, 1); |
28f540f4 RM |
187 | __mach_port_deallocate (__mach_task_self (), file); |
188 | __mach_port_deallocate (__mach_task_self (), coredir); | |
78abf563 | 189 | return !err && file != MACH_PORT_NULL; |
28f540f4 RM |
190 | } |
191 | ||
192 | ||
28f540f4 RM |
193 | /* The lowest-numbered thread state flavor value is 1, |
194 | so we use bit 0 in machine_thread_all_state.set to | |
195 | record whether we have done thread_abort. */ | |
196 | #define THREAD_ABORTED 1 | |
197 | ||
1a3a58fd | 198 | /* SS->thread is suspended. Abort the thread and get its basic state. */ |
28f540f4 RM |
199 | static void |
200 | abort_thread (struct hurd_sigstate *ss, struct machine_thread_all_state *state, | |
1a3a58fd | 201 | void (*reply) (void)) |
28f540f4 RM |
202 | { |
203 | if (!(state->set & THREAD_ABORTED)) | |
204 | { | |
b96bdcd7 RM |
205 | error_t err = __thread_abort (ss->thread); |
206 | assert_perror (err); | |
28f540f4 RM |
207 | /* Clear all thread state flavor set bits, because thread_abort may |
208 | have changed the state. */ | |
209 | state->set = THREAD_ABORTED; | |
210 | } | |
211 | ||
1a3a58fd RM |
212 | if (reply) |
213 | (*reply) (); | |
28f540f4 RM |
214 | |
215 | machine_get_basic_state (ss->thread, state); | |
216 | } | |
217 | ||
218 | /* Find the location of the MiG reply port cell in use by the thread whose | |
54da5be3 RM |
219 | state is described by THREAD_STATE. If SIGTHREAD is nonzero, make sure |
220 | that this location can be set without faulting, or else return NULL. */ | |
28f540f4 RM |
221 | |
222 | static mach_port_t * | |
54da5be3 RM |
223 | interrupted_reply_port_location (struct machine_thread_all_state *thread_state, |
224 | int sigthread) | |
28f540f4 RM |
225 | { |
226 | mach_port_t *portloc = (mach_port_t *) __hurd_threadvar_location_from_sp | |
227 | (_HURD_THREADVAR_MIG_REPLY, (void *) thread_state->basic.SP); | |
228 | ||
fb8e70d6 RM |
229 | if (sigthread && _hurdsig_catch_memory_fault (portloc)) |
230 | /* Faulted trying to read the stack. */ | |
231 | return NULL; | |
28f540f4 RM |
232 | |
233 | /* Fault now if this pointer is bogus. */ | |
234 | *(volatile mach_port_t *) portloc = *portloc; | |
235 | ||
54da5be3 RM |
236 | if (sigthread) |
237 | _hurdsig_end_catch_fault (); | |
28f540f4 RM |
238 | |
239 | return portloc; | |
240 | } | |
3fe9de0d | 241 | \f |
6df1b247 | 242 | #include <hurd/sigpreempt.h> |
3fe9de0d | 243 | #include "intr-msg.h" |
28f540f4 | 244 | |
d3dc731b MB |
245 | /* Timeout on interrupt_operation calls. */ |
246 | mach_msg_timeout_t _hurdsig_interrupt_timeout = 1000; | |
247 | ||
28f540f4 RM |
248 | /* SS->thread is suspended. |
249 | ||
250 | Abort any interruptible RPC operation the thread is doing. | |
251 | ||
252 | This uses only the constant member SS->thread and the unlocked, atomically | |
253 | set member SS->intr_port, so no locking is needed. | |
254 | ||
255 | If successfully sent an interrupt_operation and therefore the thread should | |
256 | wait for its pending RPC to return (possibly EINTR) before taking the | |
257 | incoming signal, returns the reply port to be received on. Otherwise | |
258 | returns MACH_PORT_NULL. | |
259 | ||
75914335 RM |
260 | SIGNO is used to find the applicable SA_RESTART bit. If SIGNO is zero, |
261 | the RPC fails with EINTR instead of restarting (thread_cancel). | |
262 | ||
28f540f4 RM |
263 | *STATE_CHANGE is set nonzero if STATE->basic was modified and should |
264 | be applied back to the thread if it might ever run again, else zero. */ | |
265 | ||
191abc51 | 266 | mach_port_t |
75914335 | 267 | _hurdsig_abort_rpcs (struct hurd_sigstate *ss, int signo, int sigthread, |
54da5be3 | 268 | struct machine_thread_all_state *state, int *state_change, |
1a3a58fd | 269 | void (*reply) (void)) |
28f540f4 | 270 | { |
3fe9de0d | 271 | extern const void _hurd_intr_rpc_msg_in_trap; |
54da5be3 | 272 | mach_port_t rcv_port = MACH_PORT_NULL; |
28f540f4 RM |
273 | mach_port_t intr_port; |
274 | ||
275 | *state_change = 0; | |
276 | ||
277 | intr_port = ss->intr_port; | |
278 | if (intr_port == MACH_PORT_NULL) | |
279 | /* No interruption needs done. */ | |
280 | return MACH_PORT_NULL; | |
281 | ||
282 | /* Abort the thread's kernel context, so any pending message send or | |
283 | receive completes immediately or aborts. */ | |
1a3a58fd | 284 | abort_thread (ss, state, reply); |
28f540f4 | 285 | |
54da5be3 | 286 | if (state->basic.PC < (natural_t) &_hurd_intr_rpc_msg_in_trap) |
28f540f4 | 287 | { |
54da5be3 RM |
288 | /* The thread is about to do the RPC, but hasn't yet entered |
289 | mach_msg. Mutate the thread's state so it knows not to try | |
290 | the RPC. */ | |
3fe9de0d | 291 | INTR_MSG_BACK_OUT (&state->basic); |
54da5be3 RM |
292 | MACHINE_THREAD_STATE_SET_PC (&state->basic, |
293 | &_hurd_intr_rpc_msg_in_trap); | |
294 | state->basic.SYSRETURN = MACH_SEND_INTERRUPTED; | |
295 | *state_change = 1; | |
28f540f4 | 296 | } |
54da5be3 RM |
297 | else if (state->basic.PC == (natural_t) &_hurd_intr_rpc_msg_in_trap && |
298 | /* The thread was blocked in the system call. After thread_abort, | |
299 | the return value register indicates what state the RPC was in | |
300 | when interrupted. */ | |
301 | state->basic.SYSRETURN == MACH_RCV_INTERRUPTED) | |
302 | { | |
303 | /* The RPC request message was sent and the thread was waiting for | |
304 | the reply message; now the message receive has been aborted, so | |
305 | the mach_msg call will return MACH_RCV_INTERRUPTED. We must tell | |
306 | the server to interrupt the pending operation. The thread must | |
307 | wait for the reply message before running the signal handler (to | |
308 | guarantee that the operation has finished being interrupted), so | |
309 | our nonzero return tells the trampoline code to finish the message | |
310 | receive operation before running the handler. */ | |
311 | ||
312 | mach_port_t *reply = interrupted_reply_port_location (state, | |
313 | sigthread); | |
d3dc731b | 314 | error_t err = __interrupt_operation (intr_port, _hurdsig_interrupt_timeout); |
54da5be3 RM |
315 | |
316 | if (err) | |
317 | { | |
318 | if (reply) | |
319 | { | |
320 | /* The interrupt didn't work. | |
321 | Destroy the receive right the thread is blocked on. */ | |
322 | __mach_port_destroy (__mach_task_self (), *reply); | |
323 | *reply = MACH_PORT_NULL; | |
324 | } | |
28f540f4 | 325 | |
54da5be3 RM |
326 | /* The system call return value register now contains |
327 | MACH_RCV_INTERRUPTED; when mach_msg resumes, it will retry the | |
328 | call. Since we have just destroyed the receive right, the | |
329 | retry will fail with MACH_RCV_INVALID_NAME. Instead, just | |
330 | change the return value here to EINTR so mach_msg will not | |
331 | retry and the EINTR error code will propagate up. */ | |
332 | state->basic.SYSRETURN = EINTR; | |
333 | *state_change = 1; | |
334 | } | |
335 | else if (reply) | |
336 | rcv_port = *reply; | |
337 | ||
338 | /* All threads whose RPCs were interrupted by the interrupt_operation | |
339 | call above will retry their RPCs unless we clear SS->intr_port. | |
340 | So we clear it for the thread taking a signal when SA_RESTART is | |
341 | clear, so that its call returns EINTR. */ | |
342 | if (! signo || !(ss->actions[signo].sa_flags & SA_RESTART)) | |
343 | ss->intr_port = MACH_PORT_NULL; | |
344 | } | |
28f540f4 | 345 | |
54da5be3 | 346 | return rcv_port; |
28f540f4 RM |
347 | } |
348 | ||
54da5be3 | 349 | |
28f540f4 RM |
350 | /* Abort the RPCs being run by all threads but this one; |
351 | all other threads should be suspended. If LIVE is nonzero, those | |
352 | threads may run again, so they should be adjusted as necessary to be | |
353 | happy when resumed. STATE is clobbered as a scratch area; its initial | |
354 | contents are ignored, and its contents on return are not useful. */ | |
355 | ||
356 | static void | |
357 | abort_all_rpcs (int signo, struct machine_thread_all_state *state, int live) | |
358 | { | |
359 | /* We can just loop over the sigstates. Any thread doing something | |
360 | interruptible must have one. We needn't bother locking because all | |
361 | other threads are stopped. */ | |
362 | ||
363 | struct hurd_sigstate *ss; | |
364 | size_t nthreads; | |
365 | mach_port_t *reply_ports; | |
366 | ||
367 | /* First loop over the sigstates to count them. | |
368 | We need to know how big a vector we will need for REPLY_PORTS. */ | |
369 | nthreads = 0; | |
370 | for (ss = _hurd_sigstates; ss != NULL; ss = ss->next) | |
371 | ++nthreads; | |
372 | ||
373 | reply_ports = alloca (nthreads * sizeof *reply_ports); | |
374 | ||
375 | nthreads = 0; | |
fb8e70d6 | 376 | for (ss = _hurd_sigstates; ss != NULL; ss = ss->next, ++nthreads) |
28f540f4 | 377 | if (ss->thread == _hurd_msgport_thread) |
fb8e70d6 | 378 | reply_ports[nthreads] = MACH_PORT_NULL; |
28f540f4 RM |
379 | else |
380 | { | |
381 | int state_changed; | |
382 | state->set = 0; /* Reset scratch area. */ | |
383 | ||
384 | /* Abort any operation in progress with interrupt_operation. | |
385 | Record the reply port the thread is waiting on. | |
386 | We will wait for all the replies below. */ | |
fb8e70d6 RM |
387 | reply_ports[nthreads] = _hurdsig_abort_rpcs (ss, signo, 1, |
388 | state, &state_changed, | |
389 | NULL); | |
390 | if (live) | |
391 | { | |
392 | if (reply_ports[nthreads] != MACH_PORT_NULL) | |
393 | { | |
394 | /* We will wait for the reply to this RPC below, so the | |
395 | thread must issue a new RPC rather than waiting for the | |
396 | reply to the one it sent. */ | |
397 | state->basic.SYSRETURN = EINTR; | |
398 | state_changed = 1; | |
399 | } | |
400 | if (state_changed) | |
401 | /* Aborting the RPC needed to change this thread's state, | |
402 | and it might ever run again. So write back its state. */ | |
403 | __thread_set_state (ss->thread, MACHINE_THREAD_STATE_FLAVOR, | |
404 | (natural_t *) &state->basic, | |
405 | MACHINE_THREAD_STATE_COUNT); | |
406 | } | |
28f540f4 RM |
407 | } |
408 | ||
409 | /* Wait for replies from all the successfully interrupted RPCs. */ | |
410 | while (nthreads-- > 0) | |
411 | if (reply_ports[nthreads] != MACH_PORT_NULL) | |
412 | { | |
413 | error_t err; | |
414 | mach_msg_header_t head; | |
54da5be3 | 415 | err = __mach_msg (&head, MACH_RCV_MSG|MACH_RCV_TIMEOUT, 0, sizeof head, |
28f540f4 | 416 | reply_ports[nthreads], |
54da5be3 RM |
417 | _hurd_interrupted_rpc_timeout, MACH_PORT_NULL); |
418 | switch (err) | |
419 | { | |
420 | case MACH_RCV_TIMED_OUT: | |
421 | case MACH_RCV_TOO_LARGE: | |
422 | break; | |
423 | ||
424 | default: | |
425 | assert_perror (err); | |
426 | } | |
28f540f4 RM |
427 | } |
428 | } | |
429 | ||
43b0e40f | 430 | struct hurd_signal_preemptor *_hurdsig_preemptors = 0; |
6df1b247 | 431 | sigset_t _hurdsig_preempted_set; |
28f540f4 | 432 | |
6bac11d9 MB |
433 | /* XXX temporary to deal with spelling fix */ |
434 | weak_alias (_hurdsig_preemptors, _hurdsig_preempters) | |
435 | ||
28f540f4 RM |
436 | /* Mask of stop signals. */ |
437 | #define STOPSIGS (sigmask (SIGTTIN) | sigmask (SIGTTOU) | \ | |
438 | sigmask (SIGSTOP) | sigmask (SIGTSTP)) | |
439 | ||
440 | /* Deliver a signal. SS is not locked. */ | |
441 | void | |
442 | _hurd_internal_post_signal (struct hurd_sigstate *ss, | |
93a470c7 | 443 | int signo, struct hurd_signal_detail *detail, |
28f540f4 RM |
444 | mach_port_t reply_port, |
445 | mach_msg_type_name_t reply_port_type, | |
446 | int untraced) | |
447 | { | |
b96bdcd7 | 448 | error_t err; |
28f540f4 RM |
449 | struct machine_thread_all_state thread_state; |
450 | enum { stop, ignore, core, term, handle } act; | |
10dc2a90 | 451 | struct hurd_signal_preemptor *pe; |
28f540f4 | 452 | sighandler_t handler; |
28f540f4 RM |
453 | sigset_t pending; |
454 | int ss_suspended; | |
455 | ||
456 | /* Reply to this sig_post message. */ | |
1a3a58fd RM |
457 | __typeof (__msg_sig_post_reply) *reply_rpc |
458 | = (untraced ? __msg_sig_post_untraced_reply : __msg_sig_post_reply); | |
459 | void reply (void) | |
28f540f4 | 460 | { |
1a3a58fd RM |
461 | error_t err; |
462 | if (reply_port == MACH_PORT_NULL) | |
463 | return; | |
464 | err = (*reply_rpc) (reply_port, reply_port_type, 0); | |
465 | reply_port = MACH_PORT_NULL; | |
466 | if (err != MACH_SEND_INVALID_DEST) /* Ignore dead reply port. */ | |
467 | assert_perror (err); | |
28f540f4 RM |
468 | } |
469 | ||
470 | /* Mark the signal as pending. */ | |
471 | void mark_pending (void) | |
472 | { | |
473 | __sigaddset (&ss->pending, signo); | |
93a470c7 | 474 | /* Save the details to be given to the handler when SIGNO is |
28f540f4 | 475 | unblocked. */ |
93a470c7 | 476 | ss->pending_data[signo] = *detail; |
28f540f4 RM |
477 | } |
478 | ||
479 | /* Suspend the process with SIGNO. */ | |
480 | void suspend (void) | |
481 | { | |
482 | /* Stop all other threads and mark ourselves stopped. */ | |
483 | __USEPORT (PROC, | |
484 | ({ | |
485 | /* Hold the siglock while stopping other threads to be | |
486 | sure it is not held by another thread afterwards. */ | |
487 | __mutex_lock (&_hurd_siglock); | |
488 | __proc_dostop (port, _hurd_msgport_thread); | |
489 | __mutex_unlock (&_hurd_siglock); | |
490 | abort_all_rpcs (signo, &thread_state, 1); | |
6a7169a5 | 491 | reply (); |
0e3426bb | 492 | __proc_mark_stop (port, signo, detail->code); |
28f540f4 RM |
493 | })); |
494 | _hurd_stopped = 1; | |
495 | } | |
75914335 RM |
496 | /* Resume the process after a suspension. */ |
497 | void resume (void) | |
498 | { | |
499 | /* Resume the process from being stopped. */ | |
500 | thread_t *threads; | |
501 | mach_msg_type_number_t nthreads, i; | |
502 | error_t err; | |
503 | ||
504 | if (! _hurd_stopped) | |
505 | return; | |
506 | ||
507 | /* Tell the proc server we are continuing. */ | |
508 | __USEPORT (PROC, __proc_mark_cont (port)); | |
509 | /* Fetch ports to all our threads and resume them. */ | |
510 | err = __task_threads (__mach_task_self (), &threads, &nthreads); | |
511 | assert_perror (err); | |
512 | for (i = 0; i < nthreads; ++i) | |
513 | { | |
514 | if (threads[i] != _hurd_msgport_thread && | |
515 | (act != handle || threads[i] != ss->thread)) | |
516 | { | |
517 | err = __thread_resume (threads[i]); | |
518 | assert_perror (err); | |
519 | } | |
520 | err = __mach_port_deallocate (__mach_task_self (), | |
521 | threads[i]); | |
522 | assert_perror (err); | |
523 | } | |
524 | __vm_deallocate (__mach_task_self (), | |
525 | (vm_address_t) threads, | |
526 | nthreads * sizeof *threads); | |
527 | _hurd_stopped = 0; | |
4d02a5b1 RM |
528 | if (act == handle) |
529 | /* The thread that will run the handler is already suspended. */ | |
530 | ss_suspended = 1; | |
75914335 RM |
531 | } |
532 | ||
533 | if (signo == 0) | |
534 | { | |
535 | if (untraced) | |
536 | /* This is PTRACE_CONTINUE. */ | |
537 | resume (); | |
538 | ||
539 | /* This call is just to check for pending signals. */ | |
540 | __spin_lock (&ss->lock); | |
541 | goto check_pending_signals; | |
542 | } | |
28f540f4 RM |
543 | |
544 | post_signal: | |
545 | ||
546 | thread_state.set = 0; /* We know nothing. */ | |
547 | ||
6df1b247 | 548 | __spin_lock (&ss->lock); |
28f540f4 | 549 | |
6df1b247 RM |
550 | /* Check for a preempted signal. Preempted signals can arrive during |
551 | critical sections. */ | |
552 | ||
553 | handler = SIG_ERR; | |
10dc2a90 | 554 | for (pe = ss->preemptors; pe && handler == SIG_ERR; pe = pe->next) |
93a470c7 | 555 | if (HURD_PREEMPT_SIGNAL_P (pe, signo, detail->code)) |
10dc2a90 | 556 | handler = (*pe->preemptor) (pe, ss, &signo, detail); |
6df1b247 RM |
557 | |
558 | if (handler == SIG_ERR && (__sigmask (signo) & _hurdsig_preempted_set)) | |
559 | { | |
560 | __mutex_lock (&_hurd_siglock); | |
10dc2a90 | 561 | for (pe = _hurdsig_preemptors; pe && handler == SIG_ERR; pe = pe->next) |
0e3426bb | 562 | if (HURD_PREEMPT_SIGNAL_P (pe, signo, detail->code)) |
10dc2a90 | 563 | handler = (*pe->preemptor) (pe, ss, &signo, detail); |
6df1b247 RM |
564 | __mutex_unlock (&_hurd_siglock); |
565 | } | |
28f540f4 RM |
566 | |
567 | ss_suspended = 0; | |
568 | ||
6df1b247 RM |
569 | if (handler == SIG_IGN) |
570 | /* Ignore the signal altogether. */ | |
571 | act = ignore; | |
572 | if (handler != SIG_ERR) | |
28f540f4 RM |
573 | /* Run the preemption-provided handler. */ |
574 | act = handle; | |
575 | else | |
576 | { | |
577 | /* No preemption. Do normal handling. */ | |
578 | ||
8f0c527e | 579 | if (!untraced && __sigismember (&_hurdsig_traced, signo)) |
28f540f4 RM |
580 | { |
581 | /* We are being traced. Stop to tell the debugger of the signal. */ | |
582 | if (_hurd_stopped) | |
583 | /* Already stopped. Mark the signal as pending; | |
584 | when resumed, we will notice it and stop again. */ | |
585 | mark_pending (); | |
586 | else | |
587 | suspend (); | |
588 | __spin_unlock (&ss->lock); | |
589 | reply (); | |
590 | return; | |
591 | } | |
592 | ||
75914335 RM |
593 | handler = ss->actions[signo].sa_handler; |
594 | ||
28f540f4 RM |
595 | if (handler == SIG_DFL) |
596 | /* Figure out the default action for this signal. */ | |
597 | switch (signo) | |
598 | { | |
599 | case 0: | |
600 | /* A sig_post msg with SIGNO==0 is sent to | |
601 | tell us to check for pending signals. */ | |
602 | act = ignore; | |
603 | break; | |
604 | ||
605 | case SIGTTIN: | |
606 | case SIGTTOU: | |
607 | case SIGSTOP: | |
608 | case SIGTSTP: | |
609 | act = stop; | |
610 | break; | |
611 | ||
612 | case SIGCONT: | |
613 | case SIGIO: | |
614 | case SIGURG: | |
615 | case SIGCHLD: | |
616 | case SIGWINCH: | |
617 | act = ignore; | |
618 | break; | |
619 | ||
620 | case SIGQUIT: | |
621 | case SIGILL: | |
622 | case SIGTRAP: | |
623 | case SIGIOT: | |
624 | case SIGEMT: | |
625 | case SIGFPE: | |
626 | case SIGBUS: | |
627 | case SIGSEGV: | |
628 | case SIGSYS: | |
629 | act = core; | |
630 | break; | |
631 | ||
632 | case SIGINFO: | |
633 | if (_hurd_pgrp == _hurd_pid) | |
634 | { | |
635 | /* We are the process group leader. Since there is no | |
636 | user-specified handler for SIGINFO, we use a default one | |
637 | which prints something interesting. We use the normal | |
638 | handler mechanism instead of just doing it here to avoid | |
639 | the signal thread faulting or blocking in this | |
640 | potentially hairy operation. */ | |
641 | act = handle; | |
642 | handler = _hurd_siginfo_handler; | |
643 | } | |
644 | else | |
645 | act = ignore; | |
646 | break; | |
647 | ||
648 | default: | |
649 | act = term; | |
650 | break; | |
651 | } | |
652 | else if (handler == SIG_IGN) | |
653 | act = ignore; | |
654 | else | |
655 | act = handle; | |
656 | ||
657 | if (__sigmask (signo) & STOPSIGS) | |
658 | /* Stop signals clear a pending SIGCONT even if they | |
659 | are handled or ignored (but not if preempted). */ | |
660 | ss->pending &= ~sigmask (SIGCONT); | |
661 | else | |
662 | { | |
663 | if (signo == SIGCONT) | |
664 | /* Even if handled or ignored (but not preempted), SIGCONT clears | |
665 | stop signals and resumes the process. */ | |
666 | ss->pending &= ~STOPSIGS; | |
667 | ||
668 | if (_hurd_stopped && act != stop && (untraced || signo == SIGCONT)) | |
75914335 | 669 | resume (); |
28f540f4 RM |
670 | } |
671 | } | |
672 | ||
673 | if (_hurd_orphaned && act == stop && | |
674 | (__sigmask (signo) & (__sigmask (SIGTTIN) | __sigmask (SIGTTOU) | | |
675 | __sigmask (SIGTSTP)))) | |
676 | { | |
677 | /* If we would ordinarily stop for a job control signal, but we are | |
678 | orphaned so noone would ever notice and continue us again, we just | |
679 | quietly die, alone and in the dark. */ | |
0e3426bb | 680 | detail->code = signo; |
28f540f4 RM |
681 | signo = SIGKILL; |
682 | act = term; | |
683 | } | |
684 | ||
75914335 | 685 | /* Handle receipt of a blocked signal, or any signal while stopped. */ |
4d02a5b1 RM |
686 | if (act != ignore && /* Signals ignored now are forgotten now. */ |
687 | __sigismember (&ss->blocked, signo) || | |
28f540f4 RM |
688 | (signo != SIGKILL && _hurd_stopped)) |
689 | { | |
690 | mark_pending (); | |
691 | act = ignore; | |
692 | } | |
693 | ||
694 | /* Perform the chosen action for the signal. */ | |
695 | switch (act) | |
696 | { | |
697 | case stop: | |
698 | if (_hurd_stopped) | |
b96bdcd7 RM |
699 | { |
700 | /* We are already stopped, but receiving an untraced stop | |
701 | signal. Instead of resuming and suspending again, just | |
702 | notify the proc server of the new stop signal. */ | |
0e3426bb RM |
703 | error_t err = __USEPORT (PROC, __proc_mark_stop |
704 | (port, signo, detail->code)); | |
b96bdcd7 RM |
705 | assert_perror (err); |
706 | } | |
28f540f4 RM |
707 | else |
708 | /* Suspend the process. */ | |
709 | suspend (); | |
710 | break; | |
711 | ||
712 | case ignore: | |
4d02a5b1 RM |
713 | /* Nobody cares about this signal. If there was a call to resume |
714 | above in SIGCONT processing and we've left a thread suspended, | |
715 | now's the time to set it going. */ | |
716 | if (ss_suspended) | |
717 | { | |
718 | err = __thread_resume (ss->thread); | |
719 | assert_perror (err); | |
720 | ss_suspended = 0; | |
721 | } | |
28f540f4 RM |
722 | break; |
723 | ||
421f82e5 RM |
724 | sigbomb: |
725 | /* We got a fault setting up the stack frame for the handler. | |
726 | Nothing to do but die; BSD gets SIGILL in this case. */ | |
0e3426bb | 727 | detail->code = signo; /* XXX ? */ |
421f82e5 RM |
728 | signo = SIGILL; |
729 | act = core; | |
730 | /* FALLTHROUGH */ | |
731 | ||
28f540f4 RM |
732 | case term: /* Time to die. */ |
733 | case core: /* And leave a rotting corpse. */ | |
28f540f4 | 734 | /* Have the proc server stop all other threads in our task. */ |
b96bdcd7 RM |
735 | err = __USEPORT (PROC, __proc_dostop (port, _hurd_msgport_thread)); |
736 | assert_perror (err); | |
28f540f4 RM |
737 | /* No more user instructions will be executed. |
738 | The signal can now be considered delivered. */ | |
739 | reply (); | |
740 | /* Abort all server operations now in progress. */ | |
741 | abort_all_rpcs (signo, &thread_state, 0); | |
742 | ||
743 | { | |
744 | int status = W_EXITCODE (0, signo); | |
745 | /* Do a core dump if desired. Only set the wait status bit saying we | |
746 | in fact dumped core if the operation was actually successful. */ | |
0e3426bb | 747 | if (act == core && write_corefile (signo, detail)) |
28f540f4 RM |
748 | status |= WCOREFLAG; |
749 | /* Tell proc how we died and then stick the saber in the gut. */ | |
750 | _hurd_exit (status); | |
751 | /* NOTREACHED */ | |
752 | } | |
753 | ||
754 | case handle: | |
755 | /* Call a handler for this signal. */ | |
756 | { | |
421f82e5 | 757 | struct sigcontext *scp, ocontext; |
28f540f4 RM |
758 | int wait_for_reply, state_changed; |
759 | ||
760 | /* Stop the thread and abort its pending RPC operations. */ | |
761 | if (! ss_suspended) | |
b96bdcd7 RM |
762 | { |
763 | err = __thread_suspend (ss->thread); | |
764 | assert_perror (err); | |
765 | } | |
28f540f4 RM |
766 | |
767 | /* Abort the thread's kernel context, so any pending message send | |
768 | or receive completes immediately or aborts. If an interruptible | |
769 | RPC is in progress, abort_rpcs will do this. But we must always | |
770 | do it before fetching the thread's state, because | |
771 | thread_get_state is never kosher before thread_abort. */ | |
1a3a58fd | 772 | abort_thread (ss, &thread_state, NULL); |
28f540f4 | 773 | |
421f82e5 RM |
774 | if (ss->context) |
775 | { | |
776 | /* We have a previous sigcontext that sigreturn was about | |
777 | to restore when another signal arrived. */ | |
778 | ||
779 | mach_port_t *loc; | |
28f540f4 | 780 | |
fb8e70d6 | 781 | if (_hurdsig_catch_memory_fault (ss->context)) |
421f82e5 | 782 | { |
421f82e5 RM |
783 | /* We faulted reading the thread's stack. Forget that |
784 | context and pretend it wasn't there. It almost | |
785 | certainly crash if this handler returns, but that's it's | |
786 | problem. */ | |
787 | ss->context = NULL; | |
788 | } | |
789 | else | |
790 | { | |
791 | /* Copy the context from the thread's stack before | |
792 | we start diddling the stack to set up the handler. */ | |
793 | ocontext = *ss->context; | |
794 | ss->context = &ocontext; | |
795 | } | |
796 | _hurdsig_end_catch_fault (); | |
75914335 | 797 | |
421f82e5 RM |
798 | if (! machine_get_basic_state (ss->thread, &thread_state)) |
799 | goto sigbomb; | |
54da5be3 | 800 | loc = interrupted_reply_port_location (&thread_state, 1); |
421f82e5 RM |
801 | if (loc && *loc != MACH_PORT_NULL) |
802 | /* This is the reply port for the context which called | |
803 | sigreturn. Since we are abandoning that context entirely | |
804 | and restoring SS->context instead, destroy this port. */ | |
805 | __mach_port_destroy (__mach_task_self (), *loc); | |
806 | ||
807 | /* The thread was in sigreturn, not in any interruptible RPC. */ | |
808 | wait_for_reply = 0; | |
809 | ||
8f0c527e | 810 | assert (! __spin_lock_locked (&ss->critical_section_lock)); |
421f82e5 RM |
811 | } |
812 | else | |
28f540f4 | 813 | { |
e33b438a RM |
814 | int crit = __spin_lock_locked (&ss->critical_section_lock); |
815 | ||
54da5be3 | 816 | wait_for_reply |
e33b438a RM |
817 | = (_hurdsig_abort_rpcs (ss, |
818 | /* In a critical section, any RPC | |
819 | should be cancelled instead of | |
820 | restarted, regardless of | |
821 | SA_RESTART, so the the entire | |
822 | "atomic" operation can be aborted | |
823 | as a unit. */ | |
824 | crit ? 0 : signo, 1, | |
54da5be3 | 825 | &thread_state, &state_changed, |
1a3a58fd | 826 | &reply) |
54da5be3 | 827 | != MACH_PORT_NULL); |
421f82e5 | 828 | |
e33b438a | 829 | if (crit) |
421f82e5 RM |
830 | { |
831 | /* The thread is in a critical section. Mark the signal as | |
832 | pending. When it finishes the critical section, it will | |
833 | check for pending signals. */ | |
834 | mark_pending (); | |
e33b438a RM |
835 | if (state_changed) |
836 | /* Some cases of interrupting an RPC must change the | |
837 | thread state to back out the call. Normally this | |
838 | change is rolled into the warping to the handler and | |
839 | sigreturn, but we are not running the handler now | |
840 | because the thread is in a critical section. Instead, | |
841 | mutate the thread right away for the RPC interruption | |
842 | and resume it; the RPC will return early so the | |
843 | critical section can end soon. */ | |
844 | __thread_set_state (ss->thread, MACHINE_THREAD_STATE_FLAVOR, | |
845 | (natural_t *) &thread_state.basic, | |
846 | MACHINE_THREAD_STATE_COUNT); | |
847 | /* */ | |
848 | ss->intr_port = MACH_PORT_NULL; | |
421f82e5 RM |
849 | __thread_resume (ss->thread); |
850 | break; | |
851 | } | |
28f540f4 RM |
852 | } |
853 | ||
854 | /* Call the machine-dependent function to set the thread up | |
855 | to run the signal handler, and preserve its old context. */ | |
0e3426bb | 856 | scp = _hurd_setup_sighandler (ss, handler, signo, detail, |
28f540f4 RM |
857 | wait_for_reply, &thread_state); |
858 | if (scp == NULL) | |
421f82e5 | 859 | goto sigbomb; |
28f540f4 RM |
860 | |
861 | /* Set the machine-independent parts of the signal context. */ | |
862 | ||
28f540f4 RM |
863 | { |
864 | /* Fetch the thread variable for the MiG reply port, | |
865 | and set it to MACH_PORT_NULL. */ | |
54da5be3 RM |
866 | mach_port_t *loc = interrupted_reply_port_location (&thread_state, |
867 | 1); | |
28f540f4 RM |
868 | if (loc) |
869 | { | |
870 | scp->sc_reply_port = *loc; | |
871 | *loc = MACH_PORT_NULL; | |
872 | } | |
873 | else | |
874 | scp->sc_reply_port = MACH_PORT_NULL; | |
421f82e5 RM |
875 | |
876 | /* Save the intr_port in use by the interrupted code, | |
877 | and clear the cell before running the trampoline. */ | |
878 | scp->sc_intr_port = ss->intr_port; | |
879 | ss->intr_port = MACH_PORT_NULL; | |
880 | ||
881 | if (ss->context) | |
882 | { | |
883 | /* After the handler runs we will restore to the state in | |
884 | SS->context, not the state of the thread now. So restore | |
885 | that context's reply port and intr port. */ | |
886 | ||
887 | scp->sc_reply_port = ss->context->sc_reply_port; | |
888 | scp->sc_intr_port = ss->context->sc_intr_port; | |
889 | ||
890 | ss->context = NULL; | |
891 | } | |
28f540f4 RM |
892 | } |
893 | ||
421f82e5 | 894 | /* Backdoor extra argument to signal handler. */ |
0e3426bb | 895 | scp->sc_error = detail->error; |
421f82e5 | 896 | |
28f540f4 RM |
897 | /* Block SIGNO and requested signals while running the handler. */ |
898 | scp->sc_mask = ss->blocked; | |
899 | ss->blocked |= __sigmask (signo) | ss->actions[signo].sa_mask; | |
900 | ||
28f540f4 RM |
901 | /* Start the thread running the handler (or possibly waiting for an |
902 | RPC reply before running the handler). */ | |
b96bdcd7 RM |
903 | err = __thread_set_state (ss->thread, MACHINE_THREAD_STATE_FLAVOR, |
904 | (natural_t *) &thread_state.basic, | |
905 | MACHINE_THREAD_STATE_COUNT); | |
906 | assert_perror (err); | |
907 | err = __thread_resume (ss->thread); | |
908 | assert_perror (err); | |
28f540f4 RM |
909 | thread_state.set = 0; /* Everything we know is now wrong. */ |
910 | break; | |
911 | } | |
912 | } | |
913 | ||
914 | /* The signal has either been ignored or is now being handled. We can | |
75914335 RM |
915 | consider it delivered and reply to the killer. */ |
916 | reply (); | |
28f540f4 RM |
917 | |
918 | /* We get here unless the signal was fatal. We still hold SS->lock. | |
919 | Check for pending signals, and loop to post them. */ | |
7cc645ed RM |
920 | { |
921 | /* Return nonzero if SS has any signals pending we should worry about. | |
922 | We don't worry about any pending signals if we are stopped, nor if | |
923 | SS is in a critical section. We are guaranteed to get a sig_post | |
924 | message before any of them become deliverable: either the SIGCONT | |
925 | signal, or a sig_post with SIGNO==0 as an explicit poll when the | |
926 | thread finishes its critical section. */ | |
927 | inline int signals_pending (void) | |
928 | { | |
8f0c527e | 929 | if (_hurd_stopped || __spin_lock_locked (&ss->critical_section_lock)) |
7cc645ed RM |
930 | return 0; |
931 | return pending = ss->pending & ~ss->blocked; | |
932 | } | |
933 | ||
75914335 RM |
934 | check_pending_signals: |
935 | untraced = 0; | |
936 | ||
7cc645ed RM |
937 | if (signals_pending ()) |
938 | { | |
7cc645ed RM |
939 | for (signo = 1; signo < NSIG; ++signo) |
940 | if (__sigismember (&pending, signo)) | |
941 | { | |
6172aaa3 | 942 | deliver_pending: |
7cc645ed | 943 | __sigdelset (&ss->pending, signo); |
0e3426bb | 944 | *detail = ss->pending_data[signo]; |
7cc645ed RM |
945 | __spin_unlock (&ss->lock); |
946 | goto post_signal; | |
947 | } | |
948 | } | |
949 | ||
950 | /* No pending signals left undelivered for this thread. | |
951 | If we were sent signal 0, we need to check for pending | |
952 | signals for all threads. */ | |
953 | if (signo == 0) | |
954 | { | |
955 | __spin_unlock (&ss->lock); | |
956 | __mutex_lock (&_hurd_siglock); | |
957 | for (ss = _hurd_sigstates; ss != NULL; ss = ss->next) | |
28f540f4 | 958 | { |
7cc645ed | 959 | __spin_lock (&ss->lock); |
4d02a5b1 | 960 | for (signo = 1; signo < NSIG; ++signo) |
1a6a8198 TBB |
961 | if (__sigismember (&ss->pending, signo) |
962 | && (!__sigismember (&ss->blocked, signo) | |
4bbb963e RM |
963 | /* We "deliver" immediately pending blocked signals whose |
964 | action might be to ignore, so that if ignored they are | |
965 | dropped right away. */ | |
1a6a8198 TBB |
966 | || ss->actions[signo].sa_handler == SIG_IGN |
967 | || ss->actions[signo].sa_handler == SIG_DFL)) | |
6a60a937 TBB |
968 | { |
969 | mutex_unlock (&_hurd_siglock); | |
970 | goto deliver_pending; | |
971 | } | |
28f540f4 | 972 | __spin_unlock (&ss->lock); |
28f540f4 | 973 | } |
7cc645ed RM |
974 | __mutex_unlock (&_hurd_siglock); |
975 | } | |
976 | else | |
977 | { | |
978 | /* No more signals pending; SS->lock is still locked. | |
979 | Wake up any sigsuspend call that is blocking SS->thread. */ | |
980 | if (ss->suspended != MACH_PORT_NULL) | |
981 | { | |
982 | /* There is a sigsuspend waiting. Tell it to wake up. */ | |
983 | error_t err; | |
984 | mach_msg_header_t msg; | |
985 | err = __mach_port_insert_right (__mach_task_self (), | |
986 | ss->suspended, ss->suspended, | |
987 | MACH_MSG_TYPE_MAKE_SEND); | |
988 | assert_perror (err); | |
989 | msg.msgh_bits = MACH_MSGH_BITS (MACH_MSG_TYPE_MOVE_SEND, 0); | |
990 | msg.msgh_remote_port = ss->suspended; | |
991 | msg.msgh_local_port = MACH_PORT_NULL; | |
992 | /* These values do not matter. */ | |
993 | msg.msgh_id = 8675309; /* Jenny, Jenny. */ | |
994 | msg.msgh_seqno = 17; /* Random. */ | |
995 | ss->suspended = MACH_PORT_NULL; | |
996 | err = __mach_msg (&msg, MACH_SEND_MSG, sizeof msg, 0, | |
997 | MACH_PORT_NULL, MACH_MSG_TIMEOUT_NONE, | |
998 | MACH_PORT_NULL); | |
999 | assert_perror (err); | |
1000 | } | |
1001 | __spin_unlock (&ss->lock); | |
1002 | } | |
1003 | } | |
28f540f4 RM |
1004 | |
1005 | /* All pending signals delivered to all threads. | |
1006 | Now we can send the reply message even for signal 0. */ | |
1007 | reply (); | |
1008 | } | |
1009 | \f | |
1010 | /* Decide whether REFPORT enables the sender to send us a SIGNO signal. | |
1011 | Returns zero if so, otherwise the error code to return to the sender. */ | |
1012 | ||
1013 | static error_t | |
1014 | signal_allowed (int signo, mach_port_t refport) | |
1015 | { | |
1016 | if (signo < 0 || signo >= NSIG) | |
1017 | return EINVAL; | |
1018 | ||
1019 | if (refport == __mach_task_self ()) | |
1020 | /* Can send any signal. */ | |
1021 | goto win; | |
1022 | ||
1023 | /* Avoid needing to check for this below. */ | |
1024 | if (refport == MACH_PORT_NULL) | |
1025 | return EPERM; | |
1026 | ||
1027 | switch (signo) | |
1028 | { | |
1029 | case SIGINT: | |
1030 | case SIGQUIT: | |
1031 | case SIGTSTP: | |
1032 | case SIGHUP: | |
1033 | case SIGINFO: | |
1034 | case SIGTTIN: | |
1035 | case SIGTTOU: | |
ce7f605b | 1036 | case SIGWINCH: |
28f540f4 RM |
1037 | /* Job control signals can be sent by the controlling terminal. */ |
1038 | if (__USEPORT (CTTYID, port == refport)) | |
1039 | goto win; | |
1040 | break; | |
1041 | ||
1042 | case SIGCONT: | |
1043 | { | |
1044 | /* A continue signal can be sent by anyone in the session. */ | |
1045 | mach_port_t sessport; | |
1046 | if (! __USEPORT (PROC, __proc_getsidport (port, &sessport))) | |
75914335 | 1047 | { |
28f540f4 RM |
1048 | __mach_port_deallocate (__mach_task_self (), sessport); |
1049 | if (refport == sessport) | |
1050 | goto win; | |
1051 | } | |
1052 | } | |
1053 | break; | |
1054 | ||
1055 | case SIGIO: | |
1056 | case SIGURG: | |
1057 | { | |
1058 | /* Any io object a file descriptor refers to might send us | |
1059 | one of these signals using its async ID port for REFPORT. | |
1060 | ||
1061 | This is pretty wide open; it is not unlikely that some random | |
1062 | process can at least open for reading something we have open, | |
1063 | get its async ID port, and send us a spurious SIGIO or SIGURG | |
1064 | signal. But BSD is actually wider open than that!--you can set | |
1065 | the owner of an io object to any process or process group | |
1066 | whatsoever and send them gratuitous signals. | |
1067 | ||
1068 | Someday we could implement some reasonable scheme for | |
1069 | authorizing SIGIO and SIGURG signals properly. */ | |
1070 | ||
1071 | int d; | |
e0637da1 | 1072 | int lucky = 0; /* True if we find a match for REFPORT. */ |
28f540f4 | 1073 | __mutex_lock (&_hurd_dtable_lock); |
e0637da1 | 1074 | for (d = 0; !lucky && (unsigned) d < (unsigned) _hurd_dtablesize; ++d) |
28f540f4 RM |
1075 | { |
1076 | struct hurd_userlink ulink; | |
1077 | io_t port; | |
1078 | mach_port_t asyncid; | |
1079 | if (_hurd_dtable[d] == NULL) | |
1080 | continue; | |
1081 | port = _hurd_port_get (&_hurd_dtable[d]->port, &ulink); | |
1082 | if (! __io_get_icky_async_id (port, &asyncid)) | |
1083 | { | |
1084 | if (refport == asyncid) | |
1085 | /* Break out of the loop on the next iteration. */ | |
e0637da1 | 1086 | lucky = 1; |
28f540f4 RM |
1087 | __mach_port_deallocate (__mach_task_self (), asyncid); |
1088 | } | |
1089 | _hurd_port_free (&_hurd_dtable[d]->port, &ulink, port); | |
1090 | } | |
1091 | /* If we found a lucky winner, we've set D to -1 in the loop. */ | |
e0637da1 | 1092 | if (lucky) |
28f540f4 RM |
1093 | goto win; |
1094 | } | |
1095 | } | |
1096 | ||
1097 | /* If this signal is legit, we have done `goto win' by now. | |
1098 | When we return the error, mig deallocates REFPORT. */ | |
1099 | return EPERM; | |
1100 | ||
1101 | win: | |
1102 | /* Deallocate the REFPORT send right; we are done with it. */ | |
1103 | __mach_port_deallocate (__mach_task_self (), refport); | |
1104 | ||
1105 | return 0; | |
1106 | } | |
1107 | ||
1108 | /* Implement the sig_post RPC from <hurd/msg.defs>; | |
1109 | sent when someone wants us to get a signal. */ | |
1110 | kern_return_t | |
1111 | _S_msg_sig_post (mach_port_t me, | |
1112 | mach_port_t reply_port, mach_msg_type_name_t reply_port_type, | |
8f0c527e | 1113 | int signo, natural_t sigcode, |
28f540f4 RM |
1114 | mach_port_t refport) |
1115 | { | |
1116 | error_t err; | |
93a470c7 | 1117 | struct hurd_signal_detail d; |
28f540f4 RM |
1118 | |
1119 | if (err = signal_allowed (signo, refport)) | |
1120 | return err; | |
1121 | ||
93a470c7 RM |
1122 | d.code = sigcode; |
1123 | d.exc = 0; | |
1124 | ||
28f540f4 RM |
1125 | /* Post the signal to the designated signal-receiving thread. This will |
1126 | reply when the signal can be considered delivered. */ | |
1127 | _hurd_internal_post_signal (_hurd_thread_sigstate (_hurd_sigthread), | |
93a470c7 | 1128 | signo, &d, reply_port, reply_port_type, |
28f540f4 RM |
1129 | 0); /* Stop if traced. */ |
1130 | ||
1131 | return MIG_NO_REPLY; /* Already replied. */ | |
1132 | } | |
1133 | ||
1134 | /* Implement the sig_post_untraced RPC from <hurd/msg.defs>; | |
1135 | sent when the debugger wants us to really get a signal | |
1136 | even if we are traced. */ | |
1137 | kern_return_t | |
1138 | _S_msg_sig_post_untraced (mach_port_t me, | |
1139 | mach_port_t reply_port, | |
1140 | mach_msg_type_name_t reply_port_type, | |
8f0c527e | 1141 | int signo, natural_t sigcode, |
28f540f4 RM |
1142 | mach_port_t refport) |
1143 | { | |
1144 | error_t err; | |
93a470c7 | 1145 | struct hurd_signal_detail d; |
28f540f4 RM |
1146 | |
1147 | if (err = signal_allowed (signo, refport)) | |
1148 | return err; | |
1149 | ||
93a470c7 RM |
1150 | d.code = sigcode; |
1151 | d.exc = 0; | |
1152 | ||
28f540f4 RM |
1153 | /* Post the signal to the designated signal-receiving thread. This will |
1154 | reply when the signal can be considered delivered. */ | |
1155 | _hurd_internal_post_signal (_hurd_thread_sigstate (_hurd_sigthread), | |
93a470c7 | 1156 | signo, &d, reply_port, reply_port_type, |
28f540f4 RM |
1157 | 1); /* Untraced flag. */ |
1158 | ||
1159 | return MIG_NO_REPLY; /* Already replied. */ | |
1160 | } | |
1161 | \f | |
1162 | extern void __mig_init (void *); | |
1163 | ||
1164 | #include <mach/task_special_ports.h> | |
1165 | ||
1166 | /* Initialize the message port and _hurd_sigthread and start the signal | |
1167 | thread. */ | |
1168 | ||
1169 | void | |
1170 | _hurdsig_init (void) | |
1171 | { | |
1172 | error_t err; | |
1173 | vm_size_t stacksize; | |
1174 | ||
1175 | __mutex_init (&_hurd_siglock); | |
1176 | ||
a5a81fec RM |
1177 | err = __mach_port_allocate (__mach_task_self (), |
1178 | MACH_PORT_RIGHT_RECEIVE, | |
1179 | &_hurd_msgport); | |
1180 | assert_perror (err); | |
75914335 | 1181 | |
28f540f4 | 1182 | /* Make a send right to the signal port. */ |
a5a81fec RM |
1183 | err = __mach_port_insert_right (__mach_task_self (), |
1184 | _hurd_msgport, | |
1185 | _hurd_msgport, | |
1186 | MACH_MSG_TYPE_MAKE_SEND); | |
1187 | assert_perror (err); | |
28f540f4 RM |
1188 | |
1189 | /* Set the default thread to receive task-global signals | |
1190 | to this one, the main (first) user thread. */ | |
1191 | _hurd_sigthread = __mach_thread_self (); | |
1192 | ||
1193 | /* Start the signal thread listening on the message port. */ | |
1194 | ||
a5a81fec RM |
1195 | err = __thread_create (__mach_task_self (), &_hurd_msgport_thread); |
1196 | assert_perror (err); | |
28f540f4 | 1197 | |
1f205a47 | 1198 | stacksize = __vm_page_size * 8; /* Small stack for signal thread. */ |
a5a81fec RM |
1199 | err = __mach_setup_thread (__mach_task_self (), _hurd_msgport_thread, |
1200 | _hurd_msgport_receive, | |
1201 | (vm_address_t *) &__hurd_sigthread_stack_base, | |
1202 | &stacksize); | |
1203 | assert_perror (err); | |
28f540f4 RM |
1204 | |
1205 | __hurd_sigthread_stack_end = __hurd_sigthread_stack_base + stacksize; | |
1206 | __hurd_sigthread_variables = | |
1207 | malloc (__hurd_threadvar_max * sizeof (unsigned long int)); | |
1208 | if (__hurd_sigthread_variables == NULL) | |
1209 | __libc_fatal ("hurd: Can't allocate thread variables for signal thread\n"); | |
1210 | ||
1211 | /* Reinitialize the MiG support routines so they will use a per-thread | |
1212 | variable for the cached reply port. */ | |
1213 | __mig_init ((void *) __hurd_sigthread_stack_base); | |
1214 | ||
a5a81fec RM |
1215 | err = __thread_resume (_hurd_msgport_thread); |
1216 | assert_perror (err); | |
75914335 | 1217 | |
ae1025be UD |
1218 | (void) _hurd_self_sigstate (); |
1219 | ||
28f540f4 RM |
1220 | /* Receive exceptions on the signal port. */ |
1221 | __task_set_special_port (__mach_task_self (), | |
1222 | TASK_EXCEPTION_PORT, _hurd_msgport); | |
28f540f4 RM |
1223 | } |
1224 | \f /* XXXX */ | |
1225 | /* Reauthenticate with the proc server. */ | |
1226 | ||
1227 | static void | |
1228 | reauth_proc (mach_port_t new) | |
1229 | { | |
1230 | mach_port_t ref, ignore; | |
1231 | ||
1232 | ref = __mach_reply_port (); | |
1233 | if (! HURD_PORT_USE (&_hurd_ports[INIT_PORT_PROC], | |
1234 | __proc_reauthenticate (port, ref, | |
1235 | MACH_MSG_TYPE_MAKE_SEND) || | |
8f0c527e | 1236 | __auth_user_authenticate (new, ref, |
28f540f4 RM |
1237 | MACH_MSG_TYPE_MAKE_SEND, |
1238 | &ignore)) | |
1239 | && ignore != MACH_PORT_NULL) | |
1240 | __mach_port_deallocate (__mach_task_self (), ignore); | |
1241 | __mach_port_destroy (__mach_task_self (), ref); | |
1242 | ||
762a2918 UD |
1243 | /* Set the owner of the process here too. */ |
1244 | mutex_lock (&_hurd_id.lock); | |
1245 | if (!_hurd_check_ids ()) | |
1246 | HURD_PORT_USE (&_hurd_ports[INIT_PORT_PROC], | |
1247 | __proc_setowner (port, | |
1248 | (_hurd_id.gen.nuids | |
1249 | ? _hurd_id.gen.uids[0] : 0), | |
1250 | !_hurd_id.gen.nuids)); | |
1251 | mutex_unlock (&_hurd_id.lock); | |
1252 | ||
28f540f4 RM |
1253 | (void) &reauth_proc; /* Silence compiler warning. */ |
1254 | } | |
1255 | text_set_element (_hurd_reauth_hook, reauth_proc); | |
1256 | \f | |
1257 | /* Like `getenv', but safe for the signal thread to run. | |
1258 | If the environment is trashed, this will just return NULL. */ | |
1259 | ||
1260 | const char * | |
1261 | _hurdsig_getenv (const char *variable) | |
1262 | { | |
fb8e70d6 | 1263 | if (_hurdsig_catch_memory_fault (__environ)) |
28f540f4 RM |
1264 | /* We bombed in getenv. */ |
1265 | return NULL; | |
1266 | else | |
1267 | { | |
fb8e70d6 RM |
1268 | const size_t len = strlen (variable); |
1269 | char *value = NULL; | |
1270 | char *volatile *ep = __environ; | |
1271 | while (*ep) | |
1272 | { | |
1273 | const char *p = *ep; | |
10dc2a90 UD |
1274 | _hurdsig_fault_preemptor.first = (long int) p; |
1275 | _hurdsig_fault_preemptor.last = VM_MAX_ADDRESS; | |
fb8e70d6 RM |
1276 | if (! strncmp (p, variable, len) && p[len] == '=') |
1277 | { | |
1278 | char *value; | |
1279 | size_t valuelen; | |
1280 | p += len + 1; | |
1281 | valuelen = strlen (p); | |
10dc2a90 | 1282 | _hurdsig_fault_preemptor.last = (long int) (p + valuelen); |
fb8e70d6 RM |
1283 | value = malloc (++valuelen); |
1284 | if (value) | |
1285 | memcpy (value, p, valuelen); | |
1286 | break; | |
1287 | } | |
10dc2a90 UD |
1288 | _hurdsig_fault_preemptor.first = (long int) ++ep; |
1289 | _hurdsig_fault_preemptor.last = (long int) (ep + 1); | |
fb8e70d6 | 1290 | } |
28f540f4 RM |
1291 | _hurdsig_end_catch_fault (); |
1292 | return value; | |
1293 | } | |
1294 | } |