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6df1b247 | 1 | /* Copyright (C) 1991, 92, 93, 94, 95, 96 Free Software Foundation, Inc. |
28f540f4 RM |
2 | This file is part of the GNU C Library. |
3 | ||
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. | |
8 | ||
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. | |
13 | ||
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 | |
16 | not, write to the Free Software Foundation, Inc., 675 Mass Ave, | |
17 | Cambridge, MA 02139, USA. */ | |
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> | |
25 | #include "hurdfault.h" | |
26 | #include "hurdmalloc.h" /* XXX */ | |
27 | ||
28 | const char *_hurdsig_getenv (const char *); | |
29 | ||
30 | struct mutex _hurd_siglock; | |
31 | int _hurd_stopped; | |
32 | ||
33 | /* Port that receives signals and other miscellaneous messages. */ | |
34 | mach_port_t _hurd_msgport; | |
35 | ||
36 | /* Thread listening on it. */ | |
37 | thread_t _hurd_msgport_thread; | |
38 | ||
39 | /* Thread which receives task-global signals. */ | |
40 | thread_t _hurd_sigthread; | |
41 | ||
42 | /* Linked-list of per-thread signal state. */ | |
43 | struct hurd_sigstate *_hurd_sigstates; | |
54da5be3 RM |
44 | |
45 | /* Timeout for RPC's after interrupt_operation. */ | |
46 | mach_msg_timeout_t _hurd_interrupted_rpc_timeout = 3000; | |
28f540f4 RM |
47 | \f |
48 | static void | |
49 | default_sigaction (struct sigaction actions[NSIG]) | |
50 | { | |
51 | int signo; | |
52 | ||
53 | __sigemptyset (&actions[0].sa_mask); | |
54 | actions[0].sa_flags = SA_RESTART; | |
55 | actions[0].sa_handler = SIG_DFL; | |
56 | ||
57 | for (signo = 1; signo < NSIG; ++signo) | |
58 | actions[signo] = actions[0]; | |
59 | } | |
60 | ||
61 | struct hurd_sigstate * | |
62 | _hurd_thread_sigstate (thread_t thread) | |
63 | { | |
64 | struct hurd_sigstate *ss; | |
65 | __mutex_lock (&_hurd_siglock); | |
66 | for (ss = _hurd_sigstates; ss != NULL; ss = ss->next) | |
67 | if (ss->thread == thread) | |
b96bdcd7 | 68 | break; |
28f540f4 RM |
69 | if (ss == NULL) |
70 | { | |
71 | ss = malloc (sizeof (*ss)); | |
72 | if (ss == NULL) | |
73 | __libc_fatal ("hurd: Can't allocate thread sigstate\n"); | |
74 | ss->thread = thread; | |
75 | __spin_lock_init (&ss->lock); | |
76 | ||
6df1b247 | 77 | /* Initialize default state. */ |
28f540f4 RM |
78 | __sigemptyset (&ss->blocked); |
79 | __sigemptyset (&ss->pending); | |
80 | memset (&ss->sigaltstack, 0, sizeof (ss->sigaltstack)); | |
6df1b247 | 81 | ss->preempters = NULL; |
28f540f4 | 82 | ss->suspended = 0; |
28f540f4 RM |
83 | ss->intr_port = MACH_PORT_NULL; |
84 | ss->context = NULL; | |
85 | ||
86 | /* Initialize the sigaction vector from the default signal receiving | |
87 | thread's state, and its from the system defaults. */ | |
88 | if (thread == _hurd_sigthread) | |
89 | default_sigaction (ss->actions); | |
90 | else | |
91 | { | |
92 | struct hurd_sigstate *s; | |
93 | for (s = _hurd_sigstates; s != NULL; s = s->next) | |
94 | if (s->thread == _hurd_sigthread) | |
95 | break; | |
96 | if (s) | |
97 | { | |
98 | __spin_lock (&s->lock); | |
99 | memcpy (ss->actions, s->actions, sizeof (s->actions)); | |
100 | __spin_unlock (&s->lock); | |
101 | } | |
102 | else | |
103 | default_sigaction (ss->actions); | |
104 | } | |
105 | ||
106 | ss->next = _hurd_sigstates; | |
107 | _hurd_sigstates = ss; | |
108 | } | |
109 | __mutex_unlock (&_hurd_siglock); | |
110 | return ss; | |
111 | } | |
112 | \f | |
113 | /* Signal delivery itself is on this page. */ | |
114 | ||
115 | #include <hurd/fd.h> | |
9fd18b6c | 116 | #include <hurd/crash.h> |
28f540f4 RM |
117 | #include <hurd/paths.h> |
118 | #include <setjmp.h> | |
119 | #include <fcntl.h> | |
120 | #include <sys/wait.h> | |
121 | #include "thread_state.h" | |
122 | #include <hurd/msg_server.h> | |
123 | #include <hurd/msg_reply.h> /* For __msg_sig_post_reply. */ | |
28f540f4 | 124 | #include <hurd/interrupt.h> |
fb8e70d6 RM |
125 | #include <assert.h> |
126 | #include <unistd.h> | |
28f540f4 RM |
127 | |
128 | int _hurd_core_limit; /* XXX */ | |
129 | ||
9fd18b6c | 130 | /* Call the crash dump server to mummify us before we die. |
28f540f4 RM |
131 | Returns nonzero if a core file was written. */ |
132 | static int | |
133 | write_corefile (int signo, long int sigcode, int sigerror) | |
134 | { | |
135 | error_t err; | |
136 | mach_port_t coreserver; | |
137 | file_t file, coredir; | |
138 | const char *name; | |
139 | ||
140 | /* XXX RLIMIT_CORE: | |
141 | When we have a protocol to make the server return an error | |
142 | for RLIMIT_FSIZE, then tell the corefile fs server the RLIMIT_CORE | |
143 | value in place of the RLIMIT_FSIZE value. */ | |
144 | ||
145 | /* First get a port to the core dumping server. */ | |
146 | coreserver = MACH_PORT_NULL; | |
9fd18b6c | 147 | name = _hurdsig_getenv ("CRASHSERVER"); |
28f540f4 RM |
148 | if (name != NULL) |
149 | coreserver = __file_name_lookup (name, 0, 0); | |
150 | if (coreserver == MACH_PORT_NULL) | |
9fd18b6c | 151 | coreserver = __file_name_lookup (_SERVERS_CRASH, 0, 0); |
28f540f4 RM |
152 | if (coreserver == MACH_PORT_NULL) |
153 | return 0; | |
154 | ||
155 | /* Get a port to the directory where the new core file will reside. */ | |
156 | name = _hurdsig_getenv ("COREFILE"); | |
157 | if (name == NULL) | |
158 | name = "core"; | |
159 | coredir = __file_name_split (name, (char **) &name); | |
160 | if (coredir == MACH_PORT_NULL) | |
161 | return 0; | |
162 | /* Create the new file, but don't link it into the directory yet. */ | |
163 | if (err = __dir_mkfile (coredir, O_WRONLY|O_CREAT, | |
164 | 0600 & ~_hurd_umask, /* XXX ? */ | |
165 | &file)) | |
166 | return 0; | |
167 | ||
168 | /* Call the core dumping server to write the core file. */ | |
9fd18b6c RM |
169 | err = __crash_dump_task (coreserver, |
170 | __mach_task_self (), | |
171 | file, _hurdsig_getenv ("GNUTARGET"), | |
172 | signo, sigcode, sigerror); | |
28f540f4 RM |
173 | __mach_port_deallocate (__mach_task_self (), coreserver); |
174 | if (! err) | |
175 | /* The core dump into FILE succeeded, so now link it into the | |
176 | directory. */ | |
177 | err = __dir_link (file, coredir, name); | |
178 | __mach_port_deallocate (__mach_task_self (), file); | |
179 | __mach_port_deallocate (__mach_task_self (), coredir); | |
180 | return !err; | |
181 | } | |
182 | ||
183 | ||
28f540f4 RM |
184 | /* The lowest-numbered thread state flavor value is 1, |
185 | so we use bit 0 in machine_thread_all_state.set to | |
186 | record whether we have done thread_abort. */ | |
187 | #define THREAD_ABORTED 1 | |
188 | ||
1a3a58fd | 189 | /* SS->thread is suspended. Abort the thread and get its basic state. */ |
28f540f4 RM |
190 | static void |
191 | abort_thread (struct hurd_sigstate *ss, struct machine_thread_all_state *state, | |
1a3a58fd | 192 | void (*reply) (void)) |
28f540f4 RM |
193 | { |
194 | if (!(state->set & THREAD_ABORTED)) | |
195 | { | |
b96bdcd7 RM |
196 | error_t err = __thread_abort (ss->thread); |
197 | assert_perror (err); | |
28f540f4 RM |
198 | /* Clear all thread state flavor set bits, because thread_abort may |
199 | have changed the state. */ | |
200 | state->set = THREAD_ABORTED; | |
201 | } | |
202 | ||
1a3a58fd RM |
203 | if (reply) |
204 | (*reply) (); | |
28f540f4 RM |
205 | |
206 | machine_get_basic_state (ss->thread, state); | |
207 | } | |
208 | ||
209 | /* Find the location of the MiG reply port cell in use by the thread whose | |
54da5be3 RM |
210 | state is described by THREAD_STATE. If SIGTHREAD is nonzero, make sure |
211 | that this location can be set without faulting, or else return NULL. */ | |
28f540f4 RM |
212 | |
213 | static mach_port_t * | |
54da5be3 RM |
214 | interrupted_reply_port_location (struct machine_thread_all_state *thread_state, |
215 | int sigthread) | |
28f540f4 RM |
216 | { |
217 | mach_port_t *portloc = (mach_port_t *) __hurd_threadvar_location_from_sp | |
218 | (_HURD_THREADVAR_MIG_REPLY, (void *) thread_state->basic.SP); | |
219 | ||
fb8e70d6 RM |
220 | if (sigthread && _hurdsig_catch_memory_fault (portloc)) |
221 | /* Faulted trying to read the stack. */ | |
222 | return NULL; | |
28f540f4 RM |
223 | |
224 | /* Fault now if this pointer is bogus. */ | |
225 | *(volatile mach_port_t *) portloc = *portloc; | |
226 | ||
54da5be3 RM |
227 | if (sigthread) |
228 | _hurdsig_end_catch_fault (); | |
28f540f4 RM |
229 | |
230 | return portloc; | |
231 | } | |
3fe9de0d | 232 | \f |
6df1b247 | 233 | #include <hurd/sigpreempt.h> |
3fe9de0d | 234 | #include "intr-msg.h" |
28f540f4 RM |
235 | |
236 | /* SS->thread is suspended. | |
237 | ||
238 | Abort any interruptible RPC operation the thread is doing. | |
239 | ||
240 | This uses only the constant member SS->thread and the unlocked, atomically | |
241 | set member SS->intr_port, so no locking is needed. | |
242 | ||
243 | If successfully sent an interrupt_operation and therefore the thread should | |
244 | wait for its pending RPC to return (possibly EINTR) before taking the | |
245 | incoming signal, returns the reply port to be received on. Otherwise | |
246 | returns MACH_PORT_NULL. | |
247 | ||
75914335 RM |
248 | SIGNO is used to find the applicable SA_RESTART bit. If SIGNO is zero, |
249 | the RPC fails with EINTR instead of restarting (thread_cancel). | |
250 | ||
28f540f4 RM |
251 | *STATE_CHANGE is set nonzero if STATE->basic was modified and should |
252 | be applied back to the thread if it might ever run again, else zero. */ | |
253 | ||
191abc51 | 254 | mach_port_t |
75914335 | 255 | _hurdsig_abort_rpcs (struct hurd_sigstate *ss, int signo, int sigthread, |
54da5be3 | 256 | struct machine_thread_all_state *state, int *state_change, |
1a3a58fd | 257 | void (*reply) (void)) |
28f540f4 | 258 | { |
3fe9de0d | 259 | extern const void _hurd_intr_rpc_msg_in_trap; |
54da5be3 | 260 | mach_port_t rcv_port = MACH_PORT_NULL; |
28f540f4 RM |
261 | mach_port_t intr_port; |
262 | ||
263 | *state_change = 0; | |
264 | ||
265 | intr_port = ss->intr_port; | |
266 | if (intr_port == MACH_PORT_NULL) | |
267 | /* No interruption needs done. */ | |
268 | return MACH_PORT_NULL; | |
269 | ||
270 | /* Abort the thread's kernel context, so any pending message send or | |
271 | receive completes immediately or aborts. */ | |
1a3a58fd | 272 | abort_thread (ss, state, reply); |
28f540f4 | 273 | |
54da5be3 | 274 | if (state->basic.PC < (natural_t) &_hurd_intr_rpc_msg_in_trap) |
28f540f4 | 275 | { |
54da5be3 RM |
276 | /* The thread is about to do the RPC, but hasn't yet entered |
277 | mach_msg. Mutate the thread's state so it knows not to try | |
278 | the RPC. */ | |
3fe9de0d | 279 | INTR_MSG_BACK_OUT (&state->basic); |
54da5be3 RM |
280 | MACHINE_THREAD_STATE_SET_PC (&state->basic, |
281 | &_hurd_intr_rpc_msg_in_trap); | |
282 | state->basic.SYSRETURN = MACH_SEND_INTERRUPTED; | |
283 | *state_change = 1; | |
28f540f4 | 284 | } |
54da5be3 RM |
285 | else if (state->basic.PC == (natural_t) &_hurd_intr_rpc_msg_in_trap && |
286 | /* The thread was blocked in the system call. After thread_abort, | |
287 | the return value register indicates what state the RPC was in | |
288 | when interrupted. */ | |
289 | state->basic.SYSRETURN == MACH_RCV_INTERRUPTED) | |
290 | { | |
291 | /* The RPC request message was sent and the thread was waiting for | |
292 | the reply message; now the message receive has been aborted, so | |
293 | the mach_msg call will return MACH_RCV_INTERRUPTED. We must tell | |
294 | the server to interrupt the pending operation. The thread must | |
295 | wait for the reply message before running the signal handler (to | |
296 | guarantee that the operation has finished being interrupted), so | |
297 | our nonzero return tells the trampoline code to finish the message | |
298 | receive operation before running the handler. */ | |
299 | ||
300 | mach_port_t *reply = interrupted_reply_port_location (state, | |
301 | sigthread); | |
302 | error_t err = __interrupt_operation (intr_port); | |
303 | ||
304 | if (err) | |
305 | { | |
306 | if (reply) | |
307 | { | |
308 | /* The interrupt didn't work. | |
309 | Destroy the receive right the thread is blocked on. */ | |
310 | __mach_port_destroy (__mach_task_self (), *reply); | |
311 | *reply = MACH_PORT_NULL; | |
312 | } | |
28f540f4 | 313 | |
54da5be3 RM |
314 | /* The system call return value register now contains |
315 | MACH_RCV_INTERRUPTED; when mach_msg resumes, it will retry the | |
316 | call. Since we have just destroyed the receive right, the | |
317 | retry will fail with MACH_RCV_INVALID_NAME. Instead, just | |
318 | change the return value here to EINTR so mach_msg will not | |
319 | retry and the EINTR error code will propagate up. */ | |
320 | state->basic.SYSRETURN = EINTR; | |
321 | *state_change = 1; | |
322 | } | |
323 | else if (reply) | |
324 | rcv_port = *reply; | |
325 | ||
326 | /* All threads whose RPCs were interrupted by the interrupt_operation | |
327 | call above will retry their RPCs unless we clear SS->intr_port. | |
328 | So we clear it for the thread taking a signal when SA_RESTART is | |
329 | clear, so that its call returns EINTR. */ | |
330 | if (! signo || !(ss->actions[signo].sa_flags & SA_RESTART)) | |
331 | ss->intr_port = MACH_PORT_NULL; | |
332 | } | |
28f540f4 | 333 | |
54da5be3 | 334 | return rcv_port; |
28f540f4 RM |
335 | } |
336 | ||
54da5be3 | 337 | |
28f540f4 RM |
338 | /* Abort the RPCs being run by all threads but this one; |
339 | all other threads should be suspended. If LIVE is nonzero, those | |
340 | threads may run again, so they should be adjusted as necessary to be | |
341 | happy when resumed. STATE is clobbered as a scratch area; its initial | |
342 | contents are ignored, and its contents on return are not useful. */ | |
343 | ||
344 | static void | |
345 | abort_all_rpcs (int signo, struct machine_thread_all_state *state, int live) | |
346 | { | |
347 | /* We can just loop over the sigstates. Any thread doing something | |
348 | interruptible must have one. We needn't bother locking because all | |
349 | other threads are stopped. */ | |
350 | ||
351 | struct hurd_sigstate *ss; | |
352 | size_t nthreads; | |
353 | mach_port_t *reply_ports; | |
354 | ||
355 | /* First loop over the sigstates to count them. | |
356 | We need to know how big a vector we will need for REPLY_PORTS. */ | |
357 | nthreads = 0; | |
358 | for (ss = _hurd_sigstates; ss != NULL; ss = ss->next) | |
359 | ++nthreads; | |
360 | ||
361 | reply_ports = alloca (nthreads * sizeof *reply_ports); | |
362 | ||
363 | nthreads = 0; | |
fb8e70d6 | 364 | for (ss = _hurd_sigstates; ss != NULL; ss = ss->next, ++nthreads) |
28f540f4 | 365 | if (ss->thread == _hurd_msgport_thread) |
fb8e70d6 | 366 | reply_ports[nthreads] = MACH_PORT_NULL; |
28f540f4 RM |
367 | else |
368 | { | |
369 | int state_changed; | |
370 | state->set = 0; /* Reset scratch area. */ | |
371 | ||
372 | /* Abort any operation in progress with interrupt_operation. | |
373 | Record the reply port the thread is waiting on. | |
374 | We will wait for all the replies below. */ | |
fb8e70d6 RM |
375 | reply_ports[nthreads] = _hurdsig_abort_rpcs (ss, signo, 1, |
376 | state, &state_changed, | |
377 | NULL); | |
378 | if (live) | |
379 | { | |
380 | if (reply_ports[nthreads] != MACH_PORT_NULL) | |
381 | { | |
382 | /* We will wait for the reply to this RPC below, so the | |
383 | thread must issue a new RPC rather than waiting for the | |
384 | reply to the one it sent. */ | |
385 | state->basic.SYSRETURN = EINTR; | |
386 | state_changed = 1; | |
387 | } | |
388 | if (state_changed) | |
389 | /* Aborting the RPC needed to change this thread's state, | |
390 | and it might ever run again. So write back its state. */ | |
391 | __thread_set_state (ss->thread, MACHINE_THREAD_STATE_FLAVOR, | |
392 | (natural_t *) &state->basic, | |
393 | MACHINE_THREAD_STATE_COUNT); | |
394 | } | |
28f540f4 RM |
395 | } |
396 | ||
397 | /* Wait for replies from all the successfully interrupted RPCs. */ | |
398 | while (nthreads-- > 0) | |
399 | if (reply_ports[nthreads] != MACH_PORT_NULL) | |
400 | { | |
401 | error_t err; | |
402 | mach_msg_header_t head; | |
54da5be3 | 403 | err = __mach_msg (&head, MACH_RCV_MSG|MACH_RCV_TIMEOUT, 0, sizeof head, |
28f540f4 | 404 | reply_ports[nthreads], |
54da5be3 RM |
405 | _hurd_interrupted_rpc_timeout, MACH_PORT_NULL); |
406 | switch (err) | |
407 | { | |
408 | case MACH_RCV_TIMED_OUT: | |
409 | case MACH_RCV_TOO_LARGE: | |
410 | break; | |
411 | ||
412 | default: | |
413 | assert_perror (err); | |
414 | } | |
28f540f4 RM |
415 | } |
416 | } | |
417 | ||
6df1b247 RM |
418 | struct hurd_signal_preempter *_hurdsig_preempters; |
419 | sigset_t _hurdsig_preempted_set; | |
28f540f4 RM |
420 | |
421 | /* Mask of stop signals. */ | |
422 | #define STOPSIGS (sigmask (SIGTTIN) | sigmask (SIGTTOU) | \ | |
423 | sigmask (SIGSTOP) | sigmask (SIGTSTP)) | |
424 | ||
425 | /* Deliver a signal. SS is not locked. */ | |
426 | void | |
427 | _hurd_internal_post_signal (struct hurd_sigstate *ss, | |
428 | int signo, long int sigcode, int sigerror, | |
429 | mach_port_t reply_port, | |
430 | mach_msg_type_name_t reply_port_type, | |
431 | int untraced) | |
432 | { | |
b96bdcd7 | 433 | error_t err; |
28f540f4 RM |
434 | struct machine_thread_all_state thread_state; |
435 | enum { stop, ignore, core, term, handle } act; | |
6df1b247 | 436 | struct hurd_signal_preempter *pe; |
28f540f4 | 437 | sighandler_t handler; |
28f540f4 RM |
438 | sigset_t pending; |
439 | int ss_suspended; | |
440 | ||
441 | /* Reply to this sig_post message. */ | |
1a3a58fd RM |
442 | __typeof (__msg_sig_post_reply) *reply_rpc |
443 | = (untraced ? __msg_sig_post_untraced_reply : __msg_sig_post_reply); | |
444 | void reply (void) | |
28f540f4 | 445 | { |
1a3a58fd RM |
446 | error_t err; |
447 | if (reply_port == MACH_PORT_NULL) | |
448 | return; | |
449 | err = (*reply_rpc) (reply_port, reply_port_type, 0); | |
450 | reply_port = MACH_PORT_NULL; | |
451 | if (err != MACH_SEND_INVALID_DEST) /* Ignore dead reply port. */ | |
452 | assert_perror (err); | |
28f540f4 RM |
453 | } |
454 | ||
455 | /* Mark the signal as pending. */ | |
456 | void mark_pending (void) | |
457 | { | |
458 | __sigaddset (&ss->pending, signo); | |
459 | /* Save the code to be given to the handler when SIGNO is | |
460 | unblocked. */ | |
461 | ss->pending_data[signo].code = sigcode; | |
462 | ss->pending_data[signo].error = sigerror; | |
463 | } | |
464 | ||
465 | /* Suspend the process with SIGNO. */ | |
466 | void suspend (void) | |
467 | { | |
468 | /* Stop all other threads and mark ourselves stopped. */ | |
469 | __USEPORT (PROC, | |
470 | ({ | |
471 | /* Hold the siglock while stopping other threads to be | |
472 | sure it is not held by another thread afterwards. */ | |
473 | __mutex_lock (&_hurd_siglock); | |
474 | __proc_dostop (port, _hurd_msgport_thread); | |
475 | __mutex_unlock (&_hurd_siglock); | |
476 | abort_all_rpcs (signo, &thread_state, 1); | |
6a7169a5 | 477 | reply (); |
28f540f4 RM |
478 | __proc_mark_stop (port, signo); |
479 | })); | |
480 | _hurd_stopped = 1; | |
481 | } | |
75914335 RM |
482 | /* Resume the process after a suspension. */ |
483 | void resume (void) | |
484 | { | |
485 | /* Resume the process from being stopped. */ | |
486 | thread_t *threads; | |
487 | mach_msg_type_number_t nthreads, i; | |
488 | error_t err; | |
489 | ||
490 | if (! _hurd_stopped) | |
491 | return; | |
492 | ||
493 | /* Tell the proc server we are continuing. */ | |
494 | __USEPORT (PROC, __proc_mark_cont (port)); | |
495 | /* Fetch ports to all our threads and resume them. */ | |
496 | err = __task_threads (__mach_task_self (), &threads, &nthreads); | |
497 | assert_perror (err); | |
498 | for (i = 0; i < nthreads; ++i) | |
499 | { | |
500 | if (threads[i] != _hurd_msgport_thread && | |
501 | (act != handle || threads[i] != ss->thread)) | |
502 | { | |
503 | err = __thread_resume (threads[i]); | |
504 | assert_perror (err); | |
505 | } | |
506 | err = __mach_port_deallocate (__mach_task_self (), | |
507 | threads[i]); | |
508 | assert_perror (err); | |
509 | } | |
510 | __vm_deallocate (__mach_task_self (), | |
511 | (vm_address_t) threads, | |
512 | nthreads * sizeof *threads); | |
513 | _hurd_stopped = 0; | |
514 | /* The thread that will run the handler is already suspended. */ | |
515 | ss_suspended = 1; | |
516 | } | |
517 | ||
518 | if (signo == 0) | |
519 | { | |
520 | if (untraced) | |
521 | /* This is PTRACE_CONTINUE. */ | |
522 | resume (); | |
523 | ||
524 | /* This call is just to check for pending signals. */ | |
525 | __spin_lock (&ss->lock); | |
526 | goto check_pending_signals; | |
527 | } | |
28f540f4 RM |
528 | |
529 | post_signal: | |
530 | ||
531 | thread_state.set = 0; /* We know nothing. */ | |
532 | ||
6df1b247 | 533 | __spin_lock (&ss->lock); |
28f540f4 | 534 | |
6df1b247 RM |
535 | /* Check for a preempted signal. Preempted signals can arrive during |
536 | critical sections. */ | |
537 | ||
538 | handler = SIG_ERR; | |
539 | for (pe = ss->preempters; pe && handler == SIG_ERR; pe = pe->next) | |
540 | if (HURD_PREEMPT_SIGNAL_P (pe, signo, sigcode)) | |
541 | handler = (*pe->preempter) (pe, ss, &signo, &sigcode, &sigerror); | |
542 | ||
543 | if (handler == SIG_ERR && (__sigmask (signo) & _hurdsig_preempted_set)) | |
544 | { | |
545 | __mutex_lock (&_hurd_siglock); | |
546 | for (pe = _hurdsig_preempters; pe && handler == SIG_ERR; pe = pe->next) | |
547 | if (HURD_PREEMPT_SIGNAL_P (pe, signo, sigcode)) | |
548 | handler = (*pe->preempter) (pe, ss, &signo, &sigcode, &sigerror); | |
549 | __mutex_unlock (&_hurd_siglock); | |
550 | } | |
28f540f4 RM |
551 | |
552 | ss_suspended = 0; | |
553 | ||
6df1b247 RM |
554 | if (handler == SIG_IGN) |
555 | /* Ignore the signal altogether. */ | |
556 | act = ignore; | |
557 | if (handler != SIG_ERR) | |
28f540f4 RM |
558 | /* Run the preemption-provided handler. */ |
559 | act = handle; | |
560 | else | |
561 | { | |
562 | /* No preemption. Do normal handling. */ | |
563 | ||
28f540f4 RM |
564 | if (!untraced && (_hurd_exec_flags & EXEC_TRACED)) |
565 | { | |
566 | /* We are being traced. Stop to tell the debugger of the signal. */ | |
567 | if (_hurd_stopped) | |
568 | /* Already stopped. Mark the signal as pending; | |
569 | when resumed, we will notice it and stop again. */ | |
570 | mark_pending (); | |
571 | else | |
572 | suspend (); | |
573 | __spin_unlock (&ss->lock); | |
574 | reply (); | |
575 | return; | |
576 | } | |
577 | ||
75914335 RM |
578 | handler = ss->actions[signo].sa_handler; |
579 | ||
28f540f4 RM |
580 | if (handler == SIG_DFL) |
581 | /* Figure out the default action for this signal. */ | |
582 | switch (signo) | |
583 | { | |
584 | case 0: | |
585 | /* A sig_post msg with SIGNO==0 is sent to | |
586 | tell us to check for pending signals. */ | |
587 | act = ignore; | |
588 | break; | |
589 | ||
590 | case SIGTTIN: | |
591 | case SIGTTOU: | |
592 | case SIGSTOP: | |
593 | case SIGTSTP: | |
594 | act = stop; | |
595 | break; | |
596 | ||
597 | case SIGCONT: | |
598 | case SIGIO: | |
599 | case SIGURG: | |
600 | case SIGCHLD: | |
601 | case SIGWINCH: | |
602 | act = ignore; | |
603 | break; | |
604 | ||
605 | case SIGQUIT: | |
606 | case SIGILL: | |
607 | case SIGTRAP: | |
608 | case SIGIOT: | |
609 | case SIGEMT: | |
610 | case SIGFPE: | |
611 | case SIGBUS: | |
612 | case SIGSEGV: | |
613 | case SIGSYS: | |
614 | act = core; | |
615 | break; | |
616 | ||
617 | case SIGINFO: | |
618 | if (_hurd_pgrp == _hurd_pid) | |
619 | { | |
620 | /* We are the process group leader. Since there is no | |
621 | user-specified handler for SIGINFO, we use a default one | |
622 | which prints something interesting. We use the normal | |
623 | handler mechanism instead of just doing it here to avoid | |
624 | the signal thread faulting or blocking in this | |
625 | potentially hairy operation. */ | |
626 | act = handle; | |
627 | handler = _hurd_siginfo_handler; | |
628 | } | |
629 | else | |
630 | act = ignore; | |
631 | break; | |
632 | ||
633 | default: | |
634 | act = term; | |
635 | break; | |
636 | } | |
637 | else if (handler == SIG_IGN) | |
638 | act = ignore; | |
639 | else | |
640 | act = handle; | |
641 | ||
642 | if (__sigmask (signo) & STOPSIGS) | |
643 | /* Stop signals clear a pending SIGCONT even if they | |
644 | are handled or ignored (but not if preempted). */ | |
645 | ss->pending &= ~sigmask (SIGCONT); | |
646 | else | |
647 | { | |
648 | if (signo == SIGCONT) | |
649 | /* Even if handled or ignored (but not preempted), SIGCONT clears | |
650 | stop signals and resumes the process. */ | |
651 | ss->pending &= ~STOPSIGS; | |
652 | ||
653 | if (_hurd_stopped && act != stop && (untraced || signo == SIGCONT)) | |
75914335 | 654 | resume (); |
28f540f4 RM |
655 | } |
656 | } | |
657 | ||
658 | if (_hurd_orphaned && act == stop && | |
659 | (__sigmask (signo) & (__sigmask (SIGTTIN) | __sigmask (SIGTTOU) | | |
660 | __sigmask (SIGTSTP)))) | |
661 | { | |
662 | /* If we would ordinarily stop for a job control signal, but we are | |
663 | orphaned so noone would ever notice and continue us again, we just | |
664 | quietly die, alone and in the dark. */ | |
665 | sigcode = signo; | |
666 | signo = SIGKILL; | |
667 | act = term; | |
668 | } | |
669 | ||
75914335 RM |
670 | /* Handle receipt of a blocked signal, or any signal while stopped. */ |
671 | if (__sigismember (&ss->blocked, signo) || | |
28f540f4 RM |
672 | (signo != SIGKILL && _hurd_stopped)) |
673 | { | |
674 | mark_pending (); | |
675 | act = ignore; | |
676 | } | |
677 | ||
678 | /* Perform the chosen action for the signal. */ | |
679 | switch (act) | |
680 | { | |
681 | case stop: | |
682 | if (_hurd_stopped) | |
b96bdcd7 RM |
683 | { |
684 | /* We are already stopped, but receiving an untraced stop | |
685 | signal. Instead of resuming and suspending again, just | |
686 | notify the proc server of the new stop signal. */ | |
687 | error_t err = __USEPORT (PROC, __proc_mark_stop (port, signo)); | |
688 | assert_perror (err); | |
689 | } | |
28f540f4 RM |
690 | else |
691 | /* Suspend the process. */ | |
692 | suspend (); | |
693 | break; | |
694 | ||
695 | case ignore: | |
696 | /* Nobody cares about this signal. */ | |
697 | break; | |
698 | ||
421f82e5 RM |
699 | sigbomb: |
700 | /* We got a fault setting up the stack frame for the handler. | |
701 | Nothing to do but die; BSD gets SIGILL in this case. */ | |
702 | sigcode = signo; /* XXX ? */ | |
703 | signo = SIGILL; | |
704 | act = core; | |
705 | /* FALLTHROUGH */ | |
706 | ||
28f540f4 RM |
707 | case term: /* Time to die. */ |
708 | case core: /* And leave a rotting corpse. */ | |
28f540f4 | 709 | /* Have the proc server stop all other threads in our task. */ |
b96bdcd7 RM |
710 | err = __USEPORT (PROC, __proc_dostop (port, _hurd_msgport_thread)); |
711 | assert_perror (err); | |
28f540f4 RM |
712 | /* No more user instructions will be executed. |
713 | The signal can now be considered delivered. */ | |
714 | reply (); | |
715 | /* Abort all server operations now in progress. */ | |
716 | abort_all_rpcs (signo, &thread_state, 0); | |
717 | ||
718 | { | |
719 | int status = W_EXITCODE (0, signo); | |
720 | /* Do a core dump if desired. Only set the wait status bit saying we | |
721 | in fact dumped core if the operation was actually successful. */ | |
722 | if (act == core && write_corefile (signo, sigcode, sigerror)) | |
723 | status |= WCOREFLAG; | |
724 | /* Tell proc how we died and then stick the saber in the gut. */ | |
725 | _hurd_exit (status); | |
726 | /* NOTREACHED */ | |
727 | } | |
728 | ||
729 | case handle: | |
730 | /* Call a handler for this signal. */ | |
731 | { | |
421f82e5 | 732 | struct sigcontext *scp, ocontext; |
28f540f4 RM |
733 | int wait_for_reply, state_changed; |
734 | ||
735 | /* Stop the thread and abort its pending RPC operations. */ | |
736 | if (! ss_suspended) | |
b96bdcd7 RM |
737 | { |
738 | err = __thread_suspend (ss->thread); | |
739 | assert_perror (err); | |
740 | } | |
28f540f4 RM |
741 | |
742 | /* Abort the thread's kernel context, so any pending message send | |
743 | or receive completes immediately or aborts. If an interruptible | |
744 | RPC is in progress, abort_rpcs will do this. But we must always | |
745 | do it before fetching the thread's state, because | |
746 | thread_get_state is never kosher before thread_abort. */ | |
1a3a58fd | 747 | abort_thread (ss, &thread_state, NULL); |
28f540f4 | 748 | |
421f82e5 RM |
749 | if (ss->context) |
750 | { | |
751 | /* We have a previous sigcontext that sigreturn was about | |
752 | to restore when another signal arrived. */ | |
753 | ||
754 | mach_port_t *loc; | |
28f540f4 | 755 | |
fb8e70d6 | 756 | if (_hurdsig_catch_memory_fault (ss->context)) |
421f82e5 | 757 | { |
421f82e5 RM |
758 | /* We faulted reading the thread's stack. Forget that |
759 | context and pretend it wasn't there. It almost | |
760 | certainly crash if this handler returns, but that's it's | |
761 | problem. */ | |
762 | ss->context = NULL; | |
763 | } | |
764 | else | |
765 | { | |
766 | /* Copy the context from the thread's stack before | |
767 | we start diddling the stack to set up the handler. */ | |
768 | ocontext = *ss->context; | |
769 | ss->context = &ocontext; | |
770 | } | |
771 | _hurdsig_end_catch_fault (); | |
75914335 | 772 | |
421f82e5 RM |
773 | if (! machine_get_basic_state (ss->thread, &thread_state)) |
774 | goto sigbomb; | |
54da5be3 | 775 | loc = interrupted_reply_port_location (&thread_state, 1); |
421f82e5 RM |
776 | if (loc && *loc != MACH_PORT_NULL) |
777 | /* This is the reply port for the context which called | |
778 | sigreturn. Since we are abandoning that context entirely | |
779 | and restoring SS->context instead, destroy this port. */ | |
780 | __mach_port_destroy (__mach_task_self (), *loc); | |
781 | ||
782 | /* The thread was in sigreturn, not in any interruptible RPC. */ | |
783 | wait_for_reply = 0; | |
784 | ||
785 | assert (! ss->critical_section); | |
786 | } | |
787 | else | |
28f540f4 | 788 | { |
54da5be3 | 789 | wait_for_reply |
75914335 | 790 | = (_hurdsig_abort_rpcs (ss, signo, 1, |
54da5be3 | 791 | &thread_state, &state_changed, |
1a3a58fd | 792 | &reply) |
54da5be3 | 793 | != MACH_PORT_NULL); |
421f82e5 RM |
794 | |
795 | if (ss->critical_section) | |
796 | { | |
797 | /* The thread is in a critical section. Mark the signal as | |
798 | pending. When it finishes the critical section, it will | |
799 | check for pending signals. */ | |
800 | mark_pending (); | |
801 | assert (! state_changed); | |
802 | __thread_resume (ss->thread); | |
803 | break; | |
804 | } | |
28f540f4 RM |
805 | } |
806 | ||
807 | /* Call the machine-dependent function to set the thread up | |
808 | to run the signal handler, and preserve its old context. */ | |
809 | scp = _hurd_setup_sighandler (ss, handler, | |
810 | signo, sigcode, | |
811 | wait_for_reply, &thread_state); | |
812 | if (scp == NULL) | |
421f82e5 | 813 | goto sigbomb; |
28f540f4 RM |
814 | |
815 | /* Set the machine-independent parts of the signal context. */ | |
816 | ||
28f540f4 RM |
817 | { |
818 | /* Fetch the thread variable for the MiG reply port, | |
819 | and set it to MACH_PORT_NULL. */ | |
54da5be3 RM |
820 | mach_port_t *loc = interrupted_reply_port_location (&thread_state, |
821 | 1); | |
28f540f4 RM |
822 | if (loc) |
823 | { | |
824 | scp->sc_reply_port = *loc; | |
825 | *loc = MACH_PORT_NULL; | |
826 | } | |
827 | else | |
828 | scp->sc_reply_port = MACH_PORT_NULL; | |
421f82e5 RM |
829 | |
830 | /* Save the intr_port in use by the interrupted code, | |
831 | and clear the cell before running the trampoline. */ | |
832 | scp->sc_intr_port = ss->intr_port; | |
833 | ss->intr_port = MACH_PORT_NULL; | |
834 | ||
835 | if (ss->context) | |
836 | { | |
837 | /* After the handler runs we will restore to the state in | |
838 | SS->context, not the state of the thread now. So restore | |
839 | that context's reply port and intr port. */ | |
840 | ||
841 | scp->sc_reply_port = ss->context->sc_reply_port; | |
842 | scp->sc_intr_port = ss->context->sc_intr_port; | |
843 | ||
844 | ss->context = NULL; | |
845 | } | |
28f540f4 RM |
846 | } |
847 | ||
421f82e5 RM |
848 | /* Backdoor extra argument to signal handler. */ |
849 | scp->sc_error = sigerror; | |
850 | ||
28f540f4 RM |
851 | /* Block SIGNO and requested signals while running the handler. */ |
852 | scp->sc_mask = ss->blocked; | |
853 | ss->blocked |= __sigmask (signo) | ss->actions[signo].sa_mask; | |
854 | ||
28f540f4 RM |
855 | /* Start the thread running the handler (or possibly waiting for an |
856 | RPC reply before running the handler). */ | |
b96bdcd7 RM |
857 | err = __thread_set_state (ss->thread, MACHINE_THREAD_STATE_FLAVOR, |
858 | (natural_t *) &thread_state.basic, | |
859 | MACHINE_THREAD_STATE_COUNT); | |
860 | assert_perror (err); | |
861 | err = __thread_resume (ss->thread); | |
862 | assert_perror (err); | |
28f540f4 RM |
863 | thread_state.set = 0; /* Everything we know is now wrong. */ |
864 | break; | |
865 | } | |
866 | } | |
867 | ||
868 | /* The signal has either been ignored or is now being handled. We can | |
75914335 RM |
869 | consider it delivered and reply to the killer. */ |
870 | reply (); | |
28f540f4 RM |
871 | |
872 | /* We get here unless the signal was fatal. We still hold SS->lock. | |
873 | Check for pending signals, and loop to post them. */ | |
7cc645ed RM |
874 | { |
875 | /* Return nonzero if SS has any signals pending we should worry about. | |
876 | We don't worry about any pending signals if we are stopped, nor if | |
877 | SS is in a critical section. We are guaranteed to get a sig_post | |
878 | message before any of them become deliverable: either the SIGCONT | |
879 | signal, or a sig_post with SIGNO==0 as an explicit poll when the | |
880 | thread finishes its critical section. */ | |
881 | inline int signals_pending (void) | |
882 | { | |
883 | if (_hurd_stopped || ss->critical_section) | |
884 | return 0; | |
885 | return pending = ss->pending & ~ss->blocked; | |
886 | } | |
887 | ||
75914335 RM |
888 | check_pending_signals: |
889 | untraced = 0; | |
890 | ||
7cc645ed RM |
891 | if (signals_pending ()) |
892 | { | |
893 | pending: | |
894 | for (signo = 1; signo < NSIG; ++signo) | |
895 | if (__sigismember (&pending, signo)) | |
896 | { | |
897 | __sigdelset (&ss->pending, signo); | |
898 | sigcode = ss->pending_data[signo].code; | |
899 | sigerror = ss->pending_data[signo].error; | |
900 | __spin_unlock (&ss->lock); | |
901 | goto post_signal; | |
902 | } | |
903 | } | |
904 | ||
905 | /* No pending signals left undelivered for this thread. | |
906 | If we were sent signal 0, we need to check for pending | |
907 | signals for all threads. */ | |
908 | if (signo == 0) | |
909 | { | |
910 | __spin_unlock (&ss->lock); | |
911 | __mutex_lock (&_hurd_siglock); | |
912 | for (ss = _hurd_sigstates; ss != NULL; ss = ss->next) | |
28f540f4 | 913 | { |
7cc645ed RM |
914 | __spin_lock (&ss->lock); |
915 | if (signals_pending ()) | |
916 | goto pending; | |
28f540f4 | 917 | __spin_unlock (&ss->lock); |
28f540f4 | 918 | } |
7cc645ed RM |
919 | __mutex_unlock (&_hurd_siglock); |
920 | } | |
921 | else | |
922 | { | |
923 | /* No more signals pending; SS->lock is still locked. | |
924 | Wake up any sigsuspend call that is blocking SS->thread. */ | |
925 | if (ss->suspended != MACH_PORT_NULL) | |
926 | { | |
927 | /* There is a sigsuspend waiting. Tell it to wake up. */ | |
928 | error_t err; | |
929 | mach_msg_header_t msg; | |
930 | err = __mach_port_insert_right (__mach_task_self (), | |
931 | ss->suspended, ss->suspended, | |
932 | MACH_MSG_TYPE_MAKE_SEND); | |
933 | assert_perror (err); | |
934 | msg.msgh_bits = MACH_MSGH_BITS (MACH_MSG_TYPE_MOVE_SEND, 0); | |
935 | msg.msgh_remote_port = ss->suspended; | |
936 | msg.msgh_local_port = MACH_PORT_NULL; | |
937 | /* These values do not matter. */ | |
938 | msg.msgh_id = 8675309; /* Jenny, Jenny. */ | |
939 | msg.msgh_seqno = 17; /* Random. */ | |
940 | ss->suspended = MACH_PORT_NULL; | |
941 | err = __mach_msg (&msg, MACH_SEND_MSG, sizeof msg, 0, | |
942 | MACH_PORT_NULL, MACH_MSG_TIMEOUT_NONE, | |
943 | MACH_PORT_NULL); | |
944 | assert_perror (err); | |
945 | } | |
946 | __spin_unlock (&ss->lock); | |
947 | } | |
948 | } | |
28f540f4 RM |
949 | |
950 | /* All pending signals delivered to all threads. | |
951 | Now we can send the reply message even for signal 0. */ | |
952 | reply (); | |
953 | } | |
954 | \f | |
955 | /* Decide whether REFPORT enables the sender to send us a SIGNO signal. | |
956 | Returns zero if so, otherwise the error code to return to the sender. */ | |
957 | ||
958 | static error_t | |
959 | signal_allowed (int signo, mach_port_t refport) | |
960 | { | |
961 | if (signo < 0 || signo >= NSIG) | |
962 | return EINVAL; | |
963 | ||
964 | if (refport == __mach_task_self ()) | |
965 | /* Can send any signal. */ | |
966 | goto win; | |
967 | ||
968 | /* Avoid needing to check for this below. */ | |
969 | if (refport == MACH_PORT_NULL) | |
970 | return EPERM; | |
971 | ||
972 | switch (signo) | |
973 | { | |
974 | case SIGINT: | |
975 | case SIGQUIT: | |
976 | case SIGTSTP: | |
977 | case SIGHUP: | |
978 | case SIGINFO: | |
979 | case SIGTTIN: | |
980 | case SIGTTOU: | |
981 | /* Job control signals can be sent by the controlling terminal. */ | |
982 | if (__USEPORT (CTTYID, port == refport)) | |
983 | goto win; | |
984 | break; | |
985 | ||
986 | case SIGCONT: | |
987 | { | |
988 | /* A continue signal can be sent by anyone in the session. */ | |
989 | mach_port_t sessport; | |
990 | if (! __USEPORT (PROC, __proc_getsidport (port, &sessport))) | |
75914335 | 991 | { |
28f540f4 RM |
992 | __mach_port_deallocate (__mach_task_self (), sessport); |
993 | if (refport == sessport) | |
994 | goto win; | |
995 | } | |
996 | } | |
997 | break; | |
998 | ||
999 | case SIGIO: | |
1000 | case SIGURG: | |
1001 | { | |
1002 | /* Any io object a file descriptor refers to might send us | |
1003 | one of these signals using its async ID port for REFPORT. | |
1004 | ||
1005 | This is pretty wide open; it is not unlikely that some random | |
1006 | process can at least open for reading something we have open, | |
1007 | get its async ID port, and send us a spurious SIGIO or SIGURG | |
1008 | signal. But BSD is actually wider open than that!--you can set | |
1009 | the owner of an io object to any process or process group | |
1010 | whatsoever and send them gratuitous signals. | |
1011 | ||
1012 | Someday we could implement some reasonable scheme for | |
1013 | authorizing SIGIO and SIGURG signals properly. */ | |
1014 | ||
1015 | int d; | |
1016 | __mutex_lock (&_hurd_dtable_lock); | |
1017 | for (d = 0; (unsigned int) d < (unsigned int) _hurd_dtablesize; ++d) | |
1018 | { | |
1019 | struct hurd_userlink ulink; | |
1020 | io_t port; | |
1021 | mach_port_t asyncid; | |
1022 | if (_hurd_dtable[d] == NULL) | |
1023 | continue; | |
1024 | port = _hurd_port_get (&_hurd_dtable[d]->port, &ulink); | |
1025 | if (! __io_get_icky_async_id (port, &asyncid)) | |
1026 | { | |
1027 | if (refport == asyncid) | |
1028 | /* Break out of the loop on the next iteration. */ | |
1029 | d = -1; | |
1030 | __mach_port_deallocate (__mach_task_self (), asyncid); | |
1031 | } | |
1032 | _hurd_port_free (&_hurd_dtable[d]->port, &ulink, port); | |
1033 | } | |
1034 | /* If we found a lucky winner, we've set D to -1 in the loop. */ | |
1035 | if (d < 0) | |
1036 | goto win; | |
1037 | } | |
1038 | } | |
1039 | ||
1040 | /* If this signal is legit, we have done `goto win' by now. | |
1041 | When we return the error, mig deallocates REFPORT. */ | |
1042 | return EPERM; | |
1043 | ||
1044 | win: | |
1045 | /* Deallocate the REFPORT send right; we are done with it. */ | |
1046 | __mach_port_deallocate (__mach_task_self (), refport); | |
1047 | ||
1048 | return 0; | |
1049 | } | |
1050 | ||
1051 | /* Implement the sig_post RPC from <hurd/msg.defs>; | |
1052 | sent when someone wants us to get a signal. */ | |
1053 | kern_return_t | |
1054 | _S_msg_sig_post (mach_port_t me, | |
1055 | mach_port_t reply_port, mach_msg_type_name_t reply_port_type, | |
1056 | int signo, | |
1057 | mach_port_t refport) | |
1058 | { | |
1059 | error_t err; | |
1060 | ||
1061 | if (err = signal_allowed (signo, refport)) | |
1062 | return err; | |
1063 | ||
1064 | /* Post the signal to the designated signal-receiving thread. This will | |
1065 | reply when the signal can be considered delivered. */ | |
1066 | _hurd_internal_post_signal (_hurd_thread_sigstate (_hurd_sigthread), | |
1067 | signo, 0, 0, reply_port, reply_port_type, | |
1068 | 0); /* Stop if traced. */ | |
1069 | ||
1070 | return MIG_NO_REPLY; /* Already replied. */ | |
1071 | } | |
1072 | ||
1073 | /* Implement the sig_post_untraced RPC from <hurd/msg.defs>; | |
1074 | sent when the debugger wants us to really get a signal | |
1075 | even if we are traced. */ | |
1076 | kern_return_t | |
1077 | _S_msg_sig_post_untraced (mach_port_t me, | |
1078 | mach_port_t reply_port, | |
1079 | mach_msg_type_name_t reply_port_type, | |
1080 | int signo, | |
1081 | mach_port_t refport) | |
1082 | { | |
1083 | error_t err; | |
1084 | ||
1085 | if (err = signal_allowed (signo, refport)) | |
1086 | return err; | |
1087 | ||
1088 | /* Post the signal to the designated signal-receiving thread. This will | |
1089 | reply when the signal can be considered delivered. */ | |
1090 | _hurd_internal_post_signal (_hurd_thread_sigstate (_hurd_sigthread), | |
1091 | signo, 0, 0, reply_port, reply_port_type, | |
1092 | 1); /* Untraced flag. */ | |
1093 | ||
1094 | return MIG_NO_REPLY; /* Already replied. */ | |
1095 | } | |
1096 | \f | |
1097 | extern void __mig_init (void *); | |
1098 | ||
1099 | #include <mach/task_special_ports.h> | |
1100 | ||
1101 | /* Initialize the message port and _hurd_sigthread and start the signal | |
1102 | thread. */ | |
1103 | ||
1104 | void | |
1105 | _hurdsig_init (void) | |
1106 | { | |
1107 | error_t err; | |
1108 | vm_size_t stacksize; | |
1109 | ||
1110 | __mutex_init (&_hurd_siglock); | |
1111 | ||
a5a81fec RM |
1112 | err = __mach_port_allocate (__mach_task_self (), |
1113 | MACH_PORT_RIGHT_RECEIVE, | |
1114 | &_hurd_msgport); | |
1115 | assert_perror (err); | |
75914335 | 1116 | |
28f540f4 | 1117 | /* Make a send right to the signal port. */ |
a5a81fec RM |
1118 | err = __mach_port_insert_right (__mach_task_self (), |
1119 | _hurd_msgport, | |
1120 | _hurd_msgport, | |
1121 | MACH_MSG_TYPE_MAKE_SEND); | |
1122 | assert_perror (err); | |
28f540f4 RM |
1123 | |
1124 | /* Set the default thread to receive task-global signals | |
1125 | to this one, the main (first) user thread. */ | |
1126 | _hurd_sigthread = __mach_thread_self (); | |
1127 | ||
1128 | /* Start the signal thread listening on the message port. */ | |
1129 | ||
a5a81fec RM |
1130 | err = __thread_create (__mach_task_self (), &_hurd_msgport_thread); |
1131 | assert_perror (err); | |
28f540f4 RM |
1132 | |
1133 | stacksize = __vm_page_size * 4; /* Small stack for signal thread. */ | |
a5a81fec RM |
1134 | err = __mach_setup_thread (__mach_task_self (), _hurd_msgport_thread, |
1135 | _hurd_msgport_receive, | |
1136 | (vm_address_t *) &__hurd_sigthread_stack_base, | |
1137 | &stacksize); | |
1138 | assert_perror (err); | |
28f540f4 RM |
1139 | |
1140 | __hurd_sigthread_stack_end = __hurd_sigthread_stack_base + stacksize; | |
1141 | __hurd_sigthread_variables = | |
1142 | malloc (__hurd_threadvar_max * sizeof (unsigned long int)); | |
1143 | if (__hurd_sigthread_variables == NULL) | |
1144 | __libc_fatal ("hurd: Can't allocate thread variables for signal thread\n"); | |
1145 | ||
1146 | /* Reinitialize the MiG support routines so they will use a per-thread | |
1147 | variable for the cached reply port. */ | |
1148 | __mig_init ((void *) __hurd_sigthread_stack_base); | |
1149 | ||
a5a81fec RM |
1150 | err = __thread_resume (_hurd_msgport_thread); |
1151 | assert_perror (err); | |
75914335 | 1152 | |
28f540f4 RM |
1153 | /* Receive exceptions on the signal port. */ |
1154 | __task_set_special_port (__mach_task_self (), | |
1155 | TASK_EXCEPTION_PORT, _hurd_msgport); | |
28f540f4 RM |
1156 | } |
1157 | \f /* XXXX */ | |
1158 | /* Reauthenticate with the proc server. */ | |
1159 | ||
1160 | static void | |
1161 | reauth_proc (mach_port_t new) | |
1162 | { | |
1163 | mach_port_t ref, ignore; | |
1164 | ||
1165 | ref = __mach_reply_port (); | |
1166 | if (! HURD_PORT_USE (&_hurd_ports[INIT_PORT_PROC], | |
1167 | __proc_reauthenticate (port, ref, | |
1168 | MACH_MSG_TYPE_MAKE_SEND) || | |
1169 | __auth_user_authenticate (new, port, ref, | |
1170 | MACH_MSG_TYPE_MAKE_SEND, | |
1171 | &ignore)) | |
1172 | && ignore != MACH_PORT_NULL) | |
1173 | __mach_port_deallocate (__mach_task_self (), ignore); | |
1174 | __mach_port_destroy (__mach_task_self (), ref); | |
1175 | ||
1176 | (void) &reauth_proc; /* Silence compiler warning. */ | |
1177 | } | |
1178 | text_set_element (_hurd_reauth_hook, reauth_proc); | |
1179 | \f | |
1180 | /* Like `getenv', but safe for the signal thread to run. | |
1181 | If the environment is trashed, this will just return NULL. */ | |
1182 | ||
1183 | const char * | |
1184 | _hurdsig_getenv (const char *variable) | |
1185 | { | |
fb8e70d6 | 1186 | if (_hurdsig_catch_memory_fault (__environ)) |
28f540f4 RM |
1187 | /* We bombed in getenv. */ |
1188 | return NULL; | |
1189 | else | |
1190 | { | |
fb8e70d6 RM |
1191 | const size_t len = strlen (variable); |
1192 | char *value = NULL; | |
1193 | char *volatile *ep = __environ; | |
1194 | while (*ep) | |
1195 | { | |
1196 | const char *p = *ep; | |
1197 | _hurdsig_fault_preempter.first = (long int) p; | |
1198 | _hurdsig_fault_preempter.last = VM_MAX_ADDRESS; | |
1199 | if (! strncmp (p, variable, len) && p[len] == '=') | |
1200 | { | |
1201 | char *value; | |
1202 | size_t valuelen; | |
1203 | p += len + 1; | |
1204 | valuelen = strlen (p); | |
1205 | _hurdsig_fault_preempter.last = (long int) (p + valuelen); | |
1206 | value = malloc (++valuelen); | |
1207 | if (value) | |
1208 | memcpy (value, p, valuelen); | |
1209 | break; | |
1210 | } | |
1211 | _hurdsig_fault_preempter.first = (long int) ++ep; | |
1212 | _hurdsig_fault_preempter.last = (long int) (ep + 1); | |
1213 | } | |
28f540f4 RM |
1214 | _hurdsig_end_catch_fault (); |
1215 | return value; | |
1216 | } | |
1217 | } |