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28f540f4 RM |
1 | /* Copyright (C) 1991, 1992, 1993, 1994, 1995 Free Software Foundation, Inc. |
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 | ||
77 | /* Initialze default state. */ | |
78 | __sigemptyset (&ss->blocked); | |
79 | __sigemptyset (&ss->pending); | |
80 | memset (&ss->sigaltstack, 0, sizeof (ss->sigaltstack)); | |
81 | ss->suspended = 0; | |
28f540f4 RM |
82 | ss->intr_port = MACH_PORT_NULL; |
83 | ss->context = NULL; | |
84 | ||
85 | /* Initialize the sigaction vector from the default signal receiving | |
86 | thread's state, and its from the system defaults. */ | |
87 | if (thread == _hurd_sigthread) | |
88 | default_sigaction (ss->actions); | |
89 | else | |
90 | { | |
91 | struct hurd_sigstate *s; | |
92 | for (s = _hurd_sigstates; s != NULL; s = s->next) | |
93 | if (s->thread == _hurd_sigthread) | |
94 | break; | |
95 | if (s) | |
96 | { | |
97 | __spin_lock (&s->lock); | |
98 | memcpy (ss->actions, s->actions, sizeof (s->actions)); | |
99 | __spin_unlock (&s->lock); | |
100 | } | |
101 | else | |
102 | default_sigaction (ss->actions); | |
103 | } | |
104 | ||
105 | ss->next = _hurd_sigstates; | |
106 | _hurd_sigstates = ss; | |
107 | } | |
108 | __mutex_unlock (&_hurd_siglock); | |
109 | return ss; | |
110 | } | |
111 | \f | |
112 | /* Signal delivery itself is on this page. */ | |
113 | ||
114 | #include <hurd/fd.h> | |
9fd18b6c | 115 | #include <hurd/crash.h> |
28f540f4 RM |
116 | #include <hurd/paths.h> |
117 | #include <setjmp.h> | |
118 | #include <fcntl.h> | |
119 | #include <sys/wait.h> | |
120 | #include "thread_state.h" | |
121 | #include <hurd/msg_server.h> | |
122 | #include <hurd/msg_reply.h> /* For __msg_sig_post_reply. */ | |
123 | #include <assert.h> | |
124 | #include <hurd/interrupt.h> | |
125 | ||
126 | int _hurd_core_limit; /* XXX */ | |
127 | ||
9fd18b6c | 128 | /* Call the crash dump server to mummify us before we die. |
28f540f4 RM |
129 | Returns nonzero if a core file was written. */ |
130 | static int | |
131 | write_corefile (int signo, long int sigcode, int sigerror) | |
132 | { | |
133 | error_t err; | |
134 | mach_port_t coreserver; | |
135 | file_t file, coredir; | |
136 | const char *name; | |
137 | ||
138 | /* XXX RLIMIT_CORE: | |
139 | When we have a protocol to make the server return an error | |
140 | for RLIMIT_FSIZE, then tell the corefile fs server the RLIMIT_CORE | |
141 | value in place of the RLIMIT_FSIZE value. */ | |
142 | ||
143 | /* First get a port to the core dumping server. */ | |
144 | coreserver = MACH_PORT_NULL; | |
9fd18b6c | 145 | name = _hurdsig_getenv ("CRASHSERVER"); |
28f540f4 RM |
146 | if (name != NULL) |
147 | coreserver = __file_name_lookup (name, 0, 0); | |
148 | if (coreserver == MACH_PORT_NULL) | |
9fd18b6c | 149 | coreserver = __file_name_lookup (_SERVERS_CRASH, 0, 0); |
28f540f4 RM |
150 | if (coreserver == MACH_PORT_NULL) |
151 | return 0; | |
152 | ||
153 | /* Get a port to the directory where the new core file will reside. */ | |
154 | name = _hurdsig_getenv ("COREFILE"); | |
155 | if (name == NULL) | |
156 | name = "core"; | |
157 | coredir = __file_name_split (name, (char **) &name); | |
158 | if (coredir == MACH_PORT_NULL) | |
159 | return 0; | |
160 | /* Create the new file, but don't link it into the directory yet. */ | |
161 | if (err = __dir_mkfile (coredir, O_WRONLY|O_CREAT, | |
162 | 0600 & ~_hurd_umask, /* XXX ? */ | |
163 | &file)) | |
164 | return 0; | |
165 | ||
166 | /* Call the core dumping server to write the core file. */ | |
9fd18b6c RM |
167 | err = __crash_dump_task (coreserver, |
168 | __mach_task_self (), | |
169 | file, _hurdsig_getenv ("GNUTARGET"), | |
170 | signo, sigcode, sigerror); | |
28f540f4 RM |
171 | __mach_port_deallocate (__mach_task_self (), coreserver); |
172 | if (! err) | |
173 | /* The core dump into FILE succeeded, so now link it into the | |
174 | directory. */ | |
175 | err = __dir_link (file, coredir, name); | |
176 | __mach_port_deallocate (__mach_task_self (), file); | |
177 | __mach_port_deallocate (__mach_task_self (), coredir); | |
178 | return !err; | |
179 | } | |
180 | ||
181 | ||
182 | /* Send a sig_post reply message if it hasn't already been sent. */ | |
183 | static inline void | |
184 | post_reply (mach_port_t *reply_port, mach_msg_type_name_t reply_port_type, | |
185 | int untraced, | |
186 | error_t result) | |
187 | { | |
b96bdcd7 | 188 | error_t err; |
28f540f4 RM |
189 | if (reply_port == NULL || *reply_port == MACH_PORT_NULL) |
190 | return; | |
b96bdcd7 | 191 | err = (untraced ? __msg_sig_post_untraced_reply : __msg_sig_post_reply) |
28f540f4 RM |
192 | (*reply_port, reply_port_type, result); |
193 | *reply_port = MACH_PORT_NULL; | |
b96bdcd7 RM |
194 | if (err != MACH_SEND_INVALID_DEST) /* Ignore dead reply port. */ |
195 | assert_perror (err); | |
28f540f4 RM |
196 | } |
197 | ||
198 | ||
199 | /* The lowest-numbered thread state flavor value is 1, | |
200 | so we use bit 0 in machine_thread_all_state.set to | |
201 | record whether we have done thread_abort. */ | |
202 | #define THREAD_ABORTED 1 | |
203 | ||
204 | /* SS->thread is suspended. Abort the thread and get its basic state. If | |
205 | REPLY_PORT is not NULL, send a reply on *REPLY_PORT after aborting the | |
206 | thread. */ | |
207 | static void | |
208 | abort_thread (struct hurd_sigstate *ss, struct machine_thread_all_state *state, | |
209 | mach_port_t *reply_port, mach_msg_type_name_t reply_port_type, | |
210 | int untraced) | |
211 | { | |
212 | if (!(state->set & THREAD_ABORTED)) | |
213 | { | |
b96bdcd7 RM |
214 | error_t err = __thread_abort (ss->thread); |
215 | assert_perror (err); | |
28f540f4 RM |
216 | /* Clear all thread state flavor set bits, because thread_abort may |
217 | have changed the state. */ | |
218 | state->set = THREAD_ABORTED; | |
219 | } | |
220 | ||
221 | if (reply_port) | |
222 | post_reply (reply_port, reply_port_type, untraced, 0); | |
223 | ||
224 | machine_get_basic_state (ss->thread, state); | |
225 | } | |
226 | ||
227 | /* Find the location of the MiG reply port cell in use by the thread whose | |
54da5be3 RM |
228 | state is described by THREAD_STATE. If SIGTHREAD is nonzero, make sure |
229 | that this location can be set without faulting, or else return NULL. */ | |
28f540f4 RM |
230 | |
231 | static mach_port_t * | |
54da5be3 RM |
232 | interrupted_reply_port_location (struct machine_thread_all_state *thread_state, |
233 | int sigthread) | |
28f540f4 RM |
234 | { |
235 | mach_port_t *portloc = (mach_port_t *) __hurd_threadvar_location_from_sp | |
236 | (_HURD_THREADVAR_MIG_REPLY, (void *) thread_state->basic.SP); | |
237 | ||
54da5be3 | 238 | if (sigthread && _hurdsig_catch_fault (SIGSEGV)) |
28f540f4 RM |
239 | { |
240 | assert (_hurdsig_fault_sigcode == (long int) portloc); | |
241 | /* Faulted trying to read the stack. */ | |
242 | return NULL; | |
243 | } | |
244 | ||
245 | /* Fault now if this pointer is bogus. */ | |
246 | *(volatile mach_port_t *) portloc = *portloc; | |
247 | ||
54da5be3 RM |
248 | if (sigthread) |
249 | _hurdsig_end_catch_fault (); | |
28f540f4 RM |
250 | |
251 | return portloc; | |
252 | } | |
3fe9de0d RM |
253 | \f |
254 | #include "intr-msg.h" | |
28f540f4 RM |
255 | |
256 | /* SS->thread is suspended. | |
257 | ||
258 | Abort any interruptible RPC operation the thread is doing. | |
259 | ||
260 | This uses only the constant member SS->thread and the unlocked, atomically | |
261 | set member SS->intr_port, so no locking is needed. | |
262 | ||
263 | If successfully sent an interrupt_operation and therefore the thread should | |
264 | wait for its pending RPC to return (possibly EINTR) before taking the | |
265 | incoming signal, returns the reply port to be received on. Otherwise | |
266 | returns MACH_PORT_NULL. | |
267 | ||
75914335 RM |
268 | SIGNO is used to find the applicable SA_RESTART bit. If SIGNO is zero, |
269 | the RPC fails with EINTR instead of restarting (thread_cancel). | |
270 | ||
28f540f4 RM |
271 | *STATE_CHANGE is set nonzero if STATE->basic was modified and should |
272 | be applied back to the thread if it might ever run again, else zero. */ | |
273 | ||
191abc51 | 274 | mach_port_t |
75914335 | 275 | _hurdsig_abort_rpcs (struct hurd_sigstate *ss, int signo, int sigthread, |
54da5be3 RM |
276 | struct machine_thread_all_state *state, int *state_change, |
277 | mach_port_t *reply_port, | |
278 | mach_msg_type_name_t reply_port_type, | |
279 | int untraced) | |
28f540f4 | 280 | { |
3fe9de0d | 281 | extern const void _hurd_intr_rpc_msg_in_trap; |
54da5be3 | 282 | mach_port_t rcv_port = MACH_PORT_NULL; |
28f540f4 RM |
283 | mach_port_t intr_port; |
284 | ||
285 | *state_change = 0; | |
286 | ||
287 | intr_port = ss->intr_port; | |
288 | if (intr_port == MACH_PORT_NULL) | |
289 | /* No interruption needs done. */ | |
290 | return MACH_PORT_NULL; | |
291 | ||
292 | /* Abort the thread's kernel context, so any pending message send or | |
293 | receive completes immediately or aborts. */ | |
294 | abort_thread (ss, state, reply_port, reply_port_type, untraced); | |
295 | ||
54da5be3 | 296 | if (state->basic.PC < (natural_t) &_hurd_intr_rpc_msg_in_trap) |
28f540f4 | 297 | { |
54da5be3 RM |
298 | /* The thread is about to do the RPC, but hasn't yet entered |
299 | mach_msg. Mutate the thread's state so it knows not to try | |
300 | the RPC. */ | |
3fe9de0d | 301 | INTR_MSG_BACK_OUT (&state->basic); |
54da5be3 RM |
302 | MACHINE_THREAD_STATE_SET_PC (&state->basic, |
303 | &_hurd_intr_rpc_msg_in_trap); | |
304 | state->basic.SYSRETURN = MACH_SEND_INTERRUPTED; | |
305 | *state_change = 1; | |
28f540f4 | 306 | } |
54da5be3 RM |
307 | else if (state->basic.PC == (natural_t) &_hurd_intr_rpc_msg_in_trap && |
308 | /* The thread was blocked in the system call. After thread_abort, | |
309 | the return value register indicates what state the RPC was in | |
310 | when interrupted. */ | |
311 | state->basic.SYSRETURN == MACH_RCV_INTERRUPTED) | |
312 | { | |
313 | /* The RPC request message was sent and the thread was waiting for | |
314 | the reply message; now the message receive has been aborted, so | |
315 | the mach_msg call will return MACH_RCV_INTERRUPTED. We must tell | |
316 | the server to interrupt the pending operation. The thread must | |
317 | wait for the reply message before running the signal handler (to | |
318 | guarantee that the operation has finished being interrupted), so | |
319 | our nonzero return tells the trampoline code to finish the message | |
320 | receive operation before running the handler. */ | |
321 | ||
322 | mach_port_t *reply = interrupted_reply_port_location (state, | |
323 | sigthread); | |
324 | error_t err = __interrupt_operation (intr_port); | |
325 | ||
326 | if (err) | |
327 | { | |
328 | if (reply) | |
329 | { | |
330 | /* The interrupt didn't work. | |
331 | Destroy the receive right the thread is blocked on. */ | |
332 | __mach_port_destroy (__mach_task_self (), *reply); | |
333 | *reply = MACH_PORT_NULL; | |
334 | } | |
28f540f4 | 335 | |
54da5be3 RM |
336 | /* The system call return value register now contains |
337 | MACH_RCV_INTERRUPTED; when mach_msg resumes, it will retry the | |
338 | call. Since we have just destroyed the receive right, the | |
339 | retry will fail with MACH_RCV_INVALID_NAME. Instead, just | |
340 | change the return value here to EINTR so mach_msg will not | |
341 | retry and the EINTR error code will propagate up. */ | |
342 | state->basic.SYSRETURN = EINTR; | |
343 | *state_change = 1; | |
344 | } | |
345 | else if (reply) | |
346 | rcv_port = *reply; | |
347 | ||
348 | /* All threads whose RPCs were interrupted by the interrupt_operation | |
349 | call above will retry their RPCs unless we clear SS->intr_port. | |
350 | So we clear it for the thread taking a signal when SA_RESTART is | |
351 | clear, so that its call returns EINTR. */ | |
352 | if (! signo || !(ss->actions[signo].sa_flags & SA_RESTART)) | |
353 | ss->intr_port = MACH_PORT_NULL; | |
354 | } | |
28f540f4 | 355 | |
54da5be3 | 356 | return rcv_port; |
28f540f4 RM |
357 | } |
358 | ||
54da5be3 | 359 | |
28f540f4 RM |
360 | /* Abort the RPCs being run by all threads but this one; |
361 | all other threads should be suspended. If LIVE is nonzero, those | |
362 | threads may run again, so they should be adjusted as necessary to be | |
363 | happy when resumed. STATE is clobbered as a scratch area; its initial | |
364 | contents are ignored, and its contents on return are not useful. */ | |
365 | ||
366 | static void | |
367 | abort_all_rpcs (int signo, struct machine_thread_all_state *state, int live) | |
368 | { | |
369 | /* We can just loop over the sigstates. Any thread doing something | |
370 | interruptible must have one. We needn't bother locking because all | |
371 | other threads are stopped. */ | |
372 | ||
373 | struct hurd_sigstate *ss; | |
374 | size_t nthreads; | |
375 | mach_port_t *reply_ports; | |
376 | ||
377 | /* First loop over the sigstates to count them. | |
378 | We need to know how big a vector we will need for REPLY_PORTS. */ | |
379 | nthreads = 0; | |
380 | for (ss = _hurd_sigstates; ss != NULL; ss = ss->next) | |
381 | ++nthreads; | |
382 | ||
383 | reply_ports = alloca (nthreads * sizeof *reply_ports); | |
384 | ||
385 | nthreads = 0; | |
386 | for (ss = _hurd_sigstates; ss != NULL; ss = ss->next) | |
387 | if (ss->thread == _hurd_msgport_thread) | |
388 | reply_ports[nthreads++] = MACH_PORT_NULL; | |
389 | else | |
390 | { | |
391 | int state_changed; | |
392 | state->set = 0; /* Reset scratch area. */ | |
393 | ||
394 | /* Abort any operation in progress with interrupt_operation. | |
395 | Record the reply port the thread is waiting on. | |
396 | We will wait for all the replies below. */ | |
54da5be3 RM |
397 | reply_ports[nthreads++] = _hurdsig_abort_rpcs (ss, signo, 1, |
398 | state, &state_changed, | |
399 | NULL, 0, 0); | |
28f540f4 RM |
400 | if (state_changed && live) |
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 | } | |
407 | ||
408 | /* Wait for replies from all the successfully interrupted RPCs. */ | |
409 | while (nthreads-- > 0) | |
410 | if (reply_ports[nthreads] != MACH_PORT_NULL) | |
411 | { | |
412 | error_t err; | |
413 | mach_msg_header_t head; | |
54da5be3 | 414 | err = __mach_msg (&head, MACH_RCV_MSG|MACH_RCV_TIMEOUT, 0, sizeof head, |
28f540f4 | 415 | reply_ports[nthreads], |
54da5be3 RM |
416 | _hurd_interrupted_rpc_timeout, MACH_PORT_NULL); |
417 | switch (err) | |
418 | { | |
419 | case MACH_RCV_TIMED_OUT: | |
420 | case MACH_RCV_TOO_LARGE: | |
421 | break; | |
422 | ||
423 | default: | |
424 | assert_perror (err); | |
425 | } | |
28f540f4 RM |
426 | } |
427 | } | |
428 | ||
429 | ||
430 | struct hurd_signal_preempt *_hurd_signal_preempt[NSIG]; | |
431 | struct mutex _hurd_signal_preempt_lock; | |
432 | ||
433 | /* Mask of stop signals. */ | |
434 | #define STOPSIGS (sigmask (SIGTTIN) | sigmask (SIGTTOU) | \ | |
435 | sigmask (SIGSTOP) | sigmask (SIGTSTP)) | |
436 | ||
437 | /* Deliver a signal. SS is not locked. */ | |
438 | void | |
439 | _hurd_internal_post_signal (struct hurd_sigstate *ss, | |
440 | int signo, long int sigcode, int sigerror, | |
441 | mach_port_t reply_port, | |
442 | mach_msg_type_name_t reply_port_type, | |
443 | int untraced) | |
444 | { | |
b96bdcd7 | 445 | error_t err; |
28f540f4 RM |
446 | struct machine_thread_all_state thread_state; |
447 | enum { stop, ignore, core, term, handle } act; | |
448 | sighandler_t handler; | |
449 | struct hurd_signal_preempt *pe; | |
450 | sighandler_t (*preempt) (thread_t, int, long int, int) = NULL; | |
451 | sigset_t pending; | |
452 | int ss_suspended; | |
453 | ||
454 | /* Reply to this sig_post message. */ | |
455 | inline void reply (void) | |
456 | { | |
457 | post_reply (&reply_port, reply_port_type, untraced, 0); | |
458 | } | |
459 | ||
460 | /* Mark the signal as pending. */ | |
461 | void mark_pending (void) | |
462 | { | |
463 | __sigaddset (&ss->pending, signo); | |
464 | /* Save the code to be given to the handler when SIGNO is | |
465 | unblocked. */ | |
466 | ss->pending_data[signo].code = sigcode; | |
467 | ss->pending_data[signo].error = sigerror; | |
468 | } | |
469 | ||
470 | /* Suspend the process with SIGNO. */ | |
471 | void suspend (void) | |
472 | { | |
473 | /* Stop all other threads and mark ourselves stopped. */ | |
474 | __USEPORT (PROC, | |
475 | ({ | |
476 | /* Hold the siglock while stopping other threads to be | |
477 | sure it is not held by another thread afterwards. */ | |
478 | __mutex_lock (&_hurd_siglock); | |
479 | __proc_dostop (port, _hurd_msgport_thread); | |
480 | __mutex_unlock (&_hurd_siglock); | |
481 | abort_all_rpcs (signo, &thread_state, 1); | |
482 | __proc_mark_stop (port, signo); | |
483 | })); | |
484 | _hurd_stopped = 1; | |
485 | } | |
75914335 RM |
486 | /* Resume the process after a suspension. */ |
487 | void resume (void) | |
488 | { | |
489 | /* Resume the process from being stopped. */ | |
490 | thread_t *threads; | |
491 | mach_msg_type_number_t nthreads, i; | |
492 | error_t err; | |
493 | ||
494 | if (! _hurd_stopped) | |
495 | return; | |
496 | ||
497 | /* Tell the proc server we are continuing. */ | |
498 | __USEPORT (PROC, __proc_mark_cont (port)); | |
499 | /* Fetch ports to all our threads and resume them. */ | |
500 | err = __task_threads (__mach_task_self (), &threads, &nthreads); | |
501 | assert_perror (err); | |
502 | for (i = 0; i < nthreads; ++i) | |
503 | { | |
504 | if (threads[i] != _hurd_msgport_thread && | |
505 | (act != handle || threads[i] != ss->thread)) | |
506 | { | |
507 | err = __thread_resume (threads[i]); | |
508 | assert_perror (err); | |
509 | } | |
510 | err = __mach_port_deallocate (__mach_task_self (), | |
511 | threads[i]); | |
512 | assert_perror (err); | |
513 | } | |
514 | __vm_deallocate (__mach_task_self (), | |
515 | (vm_address_t) threads, | |
516 | nthreads * sizeof *threads); | |
517 | _hurd_stopped = 0; | |
518 | /* The thread that will run the handler is already suspended. */ | |
519 | ss_suspended = 1; | |
520 | } | |
521 | ||
522 | if (signo == 0) | |
523 | { | |
524 | if (untraced) | |
525 | /* This is PTRACE_CONTINUE. */ | |
526 | resume (); | |
527 | ||
528 | /* This call is just to check for pending signals. */ | |
529 | __spin_lock (&ss->lock); | |
530 | goto check_pending_signals; | |
531 | } | |
28f540f4 RM |
532 | |
533 | post_signal: | |
534 | ||
535 | thread_state.set = 0; /* We know nothing. */ | |
536 | ||
537 | /* Check for a preempted signal. Preempted signals | |
538 | can arrive during critical sections. */ | |
539 | __mutex_lock (&_hurd_signal_preempt_lock); | |
540 | for (pe = _hurd_signal_preempt[signo]; pe != NULL; pe = pe->next) | |
0677a80c | 541 | if (pe->handler && sigcode >= pe->first && sigcode <= pe->last) |
28f540f4 RM |
542 | { |
543 | preempt = pe->handler; | |
544 | break; | |
545 | } | |
546 | __mutex_unlock (&_hurd_signal_preempt_lock); | |
547 | ||
548 | handler = SIG_DFL; | |
549 | if (preempt) | |
550 | /* Let the preempting handler examine the thread. | |
551 | If it returns SIG_DFL, we run the normal handler; | |
552 | otherwise we use the handler it returns. */ | |
553 | handler = (*preempt) (ss->thread, signo, sigcode, sigerror); | |
554 | ||
555 | ss_suspended = 0; | |
556 | ||
557 | if (handler != SIG_DFL) | |
558 | /* Run the preemption-provided handler. */ | |
559 | act = handle; | |
560 | else | |
561 | { | |
562 | /* No preemption. Do normal handling. */ | |
563 | ||
564 | __spin_lock (&ss->lock); | |
565 | ||
28f540f4 RM |
566 | if (!untraced && (_hurd_exec_flags & EXEC_TRACED)) |
567 | { | |
568 | /* We are being traced. Stop to tell the debugger of the signal. */ | |
569 | if (_hurd_stopped) | |
570 | /* Already stopped. Mark the signal as pending; | |
571 | when resumed, we will notice it and stop again. */ | |
572 | mark_pending (); | |
573 | else | |
574 | suspend (); | |
575 | __spin_unlock (&ss->lock); | |
576 | reply (); | |
577 | return; | |
578 | } | |
579 | ||
75914335 RM |
580 | handler = ss->actions[signo].sa_handler; |
581 | ||
28f540f4 RM |
582 | if (handler == SIG_DFL) |
583 | /* Figure out the default action for this signal. */ | |
584 | switch (signo) | |
585 | { | |
586 | case 0: | |
587 | /* A sig_post msg with SIGNO==0 is sent to | |
588 | tell us to check for pending signals. */ | |
589 | act = ignore; | |
590 | break; | |
591 | ||
592 | case SIGTTIN: | |
593 | case SIGTTOU: | |
594 | case SIGSTOP: | |
595 | case SIGTSTP: | |
596 | act = stop; | |
597 | break; | |
598 | ||
599 | case SIGCONT: | |
600 | case SIGIO: | |
601 | case SIGURG: | |
602 | case SIGCHLD: | |
603 | case SIGWINCH: | |
604 | act = ignore; | |
605 | break; | |
606 | ||
607 | case SIGQUIT: | |
608 | case SIGILL: | |
609 | case SIGTRAP: | |
610 | case SIGIOT: | |
611 | case SIGEMT: | |
612 | case SIGFPE: | |
613 | case SIGBUS: | |
614 | case SIGSEGV: | |
615 | case SIGSYS: | |
616 | act = core; | |
617 | break; | |
618 | ||
619 | case SIGINFO: | |
620 | if (_hurd_pgrp == _hurd_pid) | |
621 | { | |
622 | /* We are the process group leader. Since there is no | |
623 | user-specified handler for SIGINFO, we use a default one | |
624 | which prints something interesting. We use the normal | |
625 | handler mechanism instead of just doing it here to avoid | |
626 | the signal thread faulting or blocking in this | |
627 | potentially hairy operation. */ | |
628 | act = handle; | |
629 | handler = _hurd_siginfo_handler; | |
630 | } | |
631 | else | |
632 | act = ignore; | |
633 | break; | |
634 | ||
635 | default: | |
636 | act = term; | |
637 | break; | |
638 | } | |
639 | else if (handler == SIG_IGN) | |
640 | act = ignore; | |
641 | else | |
642 | act = handle; | |
643 | ||
644 | if (__sigmask (signo) & STOPSIGS) | |
645 | /* Stop signals clear a pending SIGCONT even if they | |
646 | are handled or ignored (but not if preempted). */ | |
647 | ss->pending &= ~sigmask (SIGCONT); | |
648 | else | |
649 | { | |
650 | if (signo == SIGCONT) | |
651 | /* Even if handled or ignored (but not preempted), SIGCONT clears | |
652 | stop signals and resumes the process. */ | |
653 | ss->pending &= ~STOPSIGS; | |
654 | ||
655 | if (_hurd_stopped && act != stop && (untraced || signo == SIGCONT)) | |
75914335 | 656 | resume (); |
28f540f4 RM |
657 | } |
658 | } | |
659 | ||
660 | if (_hurd_orphaned && act == stop && | |
661 | (__sigmask (signo) & (__sigmask (SIGTTIN) | __sigmask (SIGTTOU) | | |
662 | __sigmask (SIGTSTP)))) | |
663 | { | |
664 | /* If we would ordinarily stop for a job control signal, but we are | |
665 | orphaned so noone would ever notice and continue us again, we just | |
666 | quietly die, alone and in the dark. */ | |
667 | sigcode = signo; | |
668 | signo = SIGKILL; | |
669 | act = term; | |
670 | } | |
671 | ||
75914335 RM |
672 | /* Handle receipt of a blocked signal, or any signal while stopped. */ |
673 | if (__sigismember (&ss->blocked, signo) || | |
28f540f4 RM |
674 | (signo != SIGKILL && _hurd_stopped)) |
675 | { | |
676 | mark_pending (); | |
677 | act = ignore; | |
678 | } | |
679 | ||
680 | /* Perform the chosen action for the signal. */ | |
681 | switch (act) | |
682 | { | |
683 | case stop: | |
684 | if (_hurd_stopped) | |
b96bdcd7 RM |
685 | { |
686 | /* We are already stopped, but receiving an untraced stop | |
687 | signal. Instead of resuming and suspending again, just | |
688 | notify the proc server of the new stop signal. */ | |
689 | error_t err = __USEPORT (PROC, __proc_mark_stop (port, signo)); | |
690 | assert_perror (err); | |
691 | } | |
28f540f4 RM |
692 | else |
693 | /* Suspend the process. */ | |
694 | suspend (); | |
695 | break; | |
696 | ||
697 | case ignore: | |
698 | /* Nobody cares about this signal. */ | |
699 | break; | |
700 | ||
421f82e5 RM |
701 | sigbomb: |
702 | /* We got a fault setting up the stack frame for the handler. | |
703 | Nothing to do but die; BSD gets SIGILL in this case. */ | |
704 | sigcode = signo; /* XXX ? */ | |
705 | signo = SIGILL; | |
706 | act = core; | |
707 | /* FALLTHROUGH */ | |
708 | ||
28f540f4 RM |
709 | case term: /* Time to die. */ |
710 | case core: /* And leave a rotting corpse. */ | |
28f540f4 | 711 | /* Have the proc server stop all other threads in our task. */ |
b96bdcd7 RM |
712 | err = __USEPORT (PROC, __proc_dostop (port, _hurd_msgport_thread)); |
713 | assert_perror (err); | |
28f540f4 RM |
714 | /* No more user instructions will be executed. |
715 | The signal can now be considered delivered. */ | |
716 | reply (); | |
717 | /* Abort all server operations now in progress. */ | |
718 | abort_all_rpcs (signo, &thread_state, 0); | |
719 | ||
720 | { | |
721 | int status = W_EXITCODE (0, signo); | |
722 | /* Do a core dump if desired. Only set the wait status bit saying we | |
723 | in fact dumped core if the operation was actually successful. */ | |
724 | if (act == core && write_corefile (signo, sigcode, sigerror)) | |
725 | status |= WCOREFLAG; | |
726 | /* Tell proc how we died and then stick the saber in the gut. */ | |
727 | _hurd_exit (status); | |
728 | /* NOTREACHED */ | |
729 | } | |
730 | ||
731 | case handle: | |
732 | /* Call a handler for this signal. */ | |
733 | { | |
421f82e5 | 734 | struct sigcontext *scp, ocontext; |
28f540f4 RM |
735 | int wait_for_reply, state_changed; |
736 | ||
737 | /* Stop the thread and abort its pending RPC operations. */ | |
738 | if (! ss_suspended) | |
b96bdcd7 RM |
739 | { |
740 | err = __thread_suspend (ss->thread); | |
741 | assert_perror (err); | |
742 | } | |
28f540f4 RM |
743 | |
744 | /* Abort the thread's kernel context, so any pending message send | |
745 | or receive completes immediately or aborts. If an interruptible | |
746 | RPC is in progress, abort_rpcs will do this. But we must always | |
747 | do it before fetching the thread's state, because | |
748 | thread_get_state is never kosher before thread_abort. */ | |
749 | abort_thread (ss, &thread_state, NULL, 0, 0); | |
750 | ||
421f82e5 RM |
751 | if (ss->context) |
752 | { | |
753 | /* We have a previous sigcontext that sigreturn was about | |
754 | to restore when another signal arrived. */ | |
755 | ||
756 | mach_port_t *loc; | |
28f540f4 | 757 | |
421f82e5 RM |
758 | if (_hurdsig_catch_fault (SIGSEGV)) |
759 | { | |
760 | assert (_hurdsig_fault_sigcode >= (long int) ss->context && | |
761 | _hurdsig_fault_sigcode < (long int) (ss->context + 1)); | |
762 | /* We faulted reading the thread's stack. Forget that | |
763 | context and pretend it wasn't there. It almost | |
764 | certainly crash if this handler returns, but that's it's | |
765 | problem. */ | |
766 | ss->context = NULL; | |
767 | } | |
768 | else | |
769 | { | |
770 | /* Copy the context from the thread's stack before | |
771 | we start diddling the stack to set up the handler. */ | |
772 | ocontext = *ss->context; | |
773 | ss->context = &ocontext; | |
774 | } | |
775 | _hurdsig_end_catch_fault (); | |
75914335 | 776 | |
421f82e5 RM |
777 | if (! machine_get_basic_state (ss->thread, &thread_state)) |
778 | goto sigbomb; | |
54da5be3 | 779 | loc = interrupted_reply_port_location (&thread_state, 1); |
421f82e5 RM |
780 | if (loc && *loc != MACH_PORT_NULL) |
781 | /* This is the reply port for the context which called | |
782 | sigreturn. Since we are abandoning that context entirely | |
783 | and restoring SS->context instead, destroy this port. */ | |
784 | __mach_port_destroy (__mach_task_self (), *loc); | |
785 | ||
786 | /* The thread was in sigreturn, not in any interruptible RPC. */ | |
787 | wait_for_reply = 0; | |
788 | ||
789 | assert (! ss->critical_section); | |
790 | } | |
791 | else | |
28f540f4 | 792 | { |
54da5be3 | 793 | wait_for_reply |
75914335 | 794 | = (_hurdsig_abort_rpcs (ss, signo, 1, |
54da5be3 RM |
795 | &thread_state, &state_changed, |
796 | &reply_port, reply_port_type, untraced) | |
797 | != MACH_PORT_NULL); | |
421f82e5 RM |
798 | |
799 | if (ss->critical_section) | |
800 | { | |
801 | /* The thread is in a critical section. Mark the signal as | |
802 | pending. When it finishes the critical section, it will | |
803 | check for pending signals. */ | |
804 | mark_pending (); | |
805 | assert (! state_changed); | |
806 | __thread_resume (ss->thread); | |
807 | break; | |
808 | } | |
28f540f4 RM |
809 | } |
810 | ||
811 | /* Call the machine-dependent function to set the thread up | |
812 | to run the signal handler, and preserve its old context. */ | |
813 | scp = _hurd_setup_sighandler (ss, handler, | |
814 | signo, sigcode, | |
815 | wait_for_reply, &thread_state); | |
816 | if (scp == NULL) | |
421f82e5 | 817 | goto sigbomb; |
28f540f4 RM |
818 | |
819 | /* Set the machine-independent parts of the signal context. */ | |
820 | ||
28f540f4 RM |
821 | { |
822 | /* Fetch the thread variable for the MiG reply port, | |
823 | and set it to MACH_PORT_NULL. */ | |
54da5be3 RM |
824 | mach_port_t *loc = interrupted_reply_port_location (&thread_state, |
825 | 1); | |
28f540f4 RM |
826 | if (loc) |
827 | { | |
828 | scp->sc_reply_port = *loc; | |
829 | *loc = MACH_PORT_NULL; | |
830 | } | |
831 | else | |
832 | scp->sc_reply_port = MACH_PORT_NULL; | |
421f82e5 RM |
833 | |
834 | /* Save the intr_port in use by the interrupted code, | |
835 | and clear the cell before running the trampoline. */ | |
836 | scp->sc_intr_port = ss->intr_port; | |
837 | ss->intr_port = MACH_PORT_NULL; | |
838 | ||
839 | if (ss->context) | |
840 | { | |
841 | /* After the handler runs we will restore to the state in | |
842 | SS->context, not the state of the thread now. So restore | |
843 | that context's reply port and intr port. */ | |
844 | ||
845 | scp->sc_reply_port = ss->context->sc_reply_port; | |
846 | scp->sc_intr_port = ss->context->sc_intr_port; | |
847 | ||
848 | ss->context = NULL; | |
849 | } | |
28f540f4 RM |
850 | } |
851 | ||
421f82e5 RM |
852 | /* Backdoor extra argument to signal handler. */ |
853 | scp->sc_error = sigerror; | |
854 | ||
28f540f4 RM |
855 | /* Block SIGNO and requested signals while running the handler. */ |
856 | scp->sc_mask = ss->blocked; | |
857 | ss->blocked |= __sigmask (signo) | ss->actions[signo].sa_mask; | |
858 | ||
28f540f4 RM |
859 | /* Start the thread running the handler (or possibly waiting for an |
860 | RPC reply before running the handler). */ | |
b96bdcd7 RM |
861 | err = __thread_set_state (ss->thread, MACHINE_THREAD_STATE_FLAVOR, |
862 | (natural_t *) &thread_state.basic, | |
863 | MACHINE_THREAD_STATE_COUNT); | |
864 | assert_perror (err); | |
865 | err = __thread_resume (ss->thread); | |
866 | assert_perror (err); | |
28f540f4 RM |
867 | thread_state.set = 0; /* Everything we know is now wrong. */ |
868 | break; | |
869 | } | |
870 | } | |
871 | ||
872 | /* The signal has either been ignored or is now being handled. We can | |
75914335 RM |
873 | consider it delivered and reply to the killer. */ |
874 | reply (); | |
28f540f4 RM |
875 | |
876 | /* We get here unless the signal was fatal. We still hold SS->lock. | |
877 | Check for pending signals, and loop to post them. */ | |
7cc645ed RM |
878 | { |
879 | /* Return nonzero if SS has any signals pending we should worry about. | |
880 | We don't worry about any pending signals if we are stopped, nor if | |
881 | SS is in a critical section. We are guaranteed to get a sig_post | |
882 | message before any of them become deliverable: either the SIGCONT | |
883 | signal, or a sig_post with SIGNO==0 as an explicit poll when the | |
884 | thread finishes its critical section. */ | |
885 | inline int signals_pending (void) | |
886 | { | |
887 | if (_hurd_stopped || ss->critical_section) | |
888 | return 0; | |
889 | return pending = ss->pending & ~ss->blocked; | |
890 | } | |
891 | ||
75914335 RM |
892 | check_pending_signals: |
893 | untraced = 0; | |
894 | ||
7cc645ed RM |
895 | if (signals_pending ()) |
896 | { | |
897 | pending: | |
898 | for (signo = 1; signo < NSIG; ++signo) | |
899 | if (__sigismember (&pending, signo)) | |
900 | { | |
901 | __sigdelset (&ss->pending, signo); | |
902 | sigcode = ss->pending_data[signo].code; | |
903 | sigerror = ss->pending_data[signo].error; | |
904 | __spin_unlock (&ss->lock); | |
905 | goto post_signal; | |
906 | } | |
907 | } | |
908 | ||
909 | /* No pending signals left undelivered for this thread. | |
910 | If we were sent signal 0, we need to check for pending | |
911 | signals for all threads. */ | |
912 | if (signo == 0) | |
913 | { | |
914 | __spin_unlock (&ss->lock); | |
915 | __mutex_lock (&_hurd_siglock); | |
916 | for (ss = _hurd_sigstates; ss != NULL; ss = ss->next) | |
28f540f4 | 917 | { |
7cc645ed RM |
918 | __spin_lock (&ss->lock); |
919 | if (signals_pending ()) | |
920 | goto pending; | |
28f540f4 | 921 | __spin_unlock (&ss->lock); |
28f540f4 | 922 | } |
7cc645ed RM |
923 | __mutex_unlock (&_hurd_siglock); |
924 | } | |
925 | else | |
926 | { | |
927 | /* No more signals pending; SS->lock is still locked. | |
928 | Wake up any sigsuspend call that is blocking SS->thread. */ | |
929 | if (ss->suspended != MACH_PORT_NULL) | |
930 | { | |
931 | /* There is a sigsuspend waiting. Tell it to wake up. */ | |
932 | error_t err; | |
933 | mach_msg_header_t msg; | |
934 | err = __mach_port_insert_right (__mach_task_self (), | |
935 | ss->suspended, ss->suspended, | |
936 | MACH_MSG_TYPE_MAKE_SEND); | |
937 | assert_perror (err); | |
938 | msg.msgh_bits = MACH_MSGH_BITS (MACH_MSG_TYPE_MOVE_SEND, 0); | |
939 | msg.msgh_remote_port = ss->suspended; | |
940 | msg.msgh_local_port = MACH_PORT_NULL; | |
941 | /* These values do not matter. */ | |
942 | msg.msgh_id = 8675309; /* Jenny, Jenny. */ | |
943 | msg.msgh_seqno = 17; /* Random. */ | |
944 | ss->suspended = MACH_PORT_NULL; | |
945 | err = __mach_msg (&msg, MACH_SEND_MSG, sizeof msg, 0, | |
946 | MACH_PORT_NULL, MACH_MSG_TIMEOUT_NONE, | |
947 | MACH_PORT_NULL); | |
948 | assert_perror (err); | |
949 | } | |
950 | __spin_unlock (&ss->lock); | |
951 | } | |
952 | } | |
28f540f4 RM |
953 | |
954 | /* All pending signals delivered to all threads. | |
955 | Now we can send the reply message even for signal 0. */ | |
956 | reply (); | |
957 | } | |
958 | \f | |
959 | /* Decide whether REFPORT enables the sender to send us a SIGNO signal. | |
960 | Returns zero if so, otherwise the error code to return to the sender. */ | |
961 | ||
962 | static error_t | |
963 | signal_allowed (int signo, mach_port_t refport) | |
964 | { | |
965 | if (signo < 0 || signo >= NSIG) | |
966 | return EINVAL; | |
967 | ||
968 | if (refport == __mach_task_self ()) | |
969 | /* Can send any signal. */ | |
970 | goto win; | |
971 | ||
972 | /* Avoid needing to check for this below. */ | |
973 | if (refport == MACH_PORT_NULL) | |
974 | return EPERM; | |
975 | ||
976 | switch (signo) | |
977 | { | |
978 | case SIGINT: | |
979 | case SIGQUIT: | |
980 | case SIGTSTP: | |
981 | case SIGHUP: | |
982 | case SIGINFO: | |
983 | case SIGTTIN: | |
984 | case SIGTTOU: | |
985 | /* Job control signals can be sent by the controlling terminal. */ | |
986 | if (__USEPORT (CTTYID, port == refport)) | |
987 | goto win; | |
988 | break; | |
989 | ||
990 | case SIGCONT: | |
991 | { | |
992 | /* A continue signal can be sent by anyone in the session. */ | |
993 | mach_port_t sessport; | |
994 | if (! __USEPORT (PROC, __proc_getsidport (port, &sessport))) | |
75914335 | 995 | { |
28f540f4 RM |
996 | __mach_port_deallocate (__mach_task_self (), sessport); |
997 | if (refport == sessport) | |
998 | goto win; | |
999 | } | |
1000 | } | |
1001 | break; | |
1002 | ||
1003 | case SIGIO: | |
1004 | case SIGURG: | |
1005 | { | |
1006 | /* Any io object a file descriptor refers to might send us | |
1007 | one of these signals using its async ID port for REFPORT. | |
1008 | ||
1009 | This is pretty wide open; it is not unlikely that some random | |
1010 | process can at least open for reading something we have open, | |
1011 | get its async ID port, and send us a spurious SIGIO or SIGURG | |
1012 | signal. But BSD is actually wider open than that!--you can set | |
1013 | the owner of an io object to any process or process group | |
1014 | whatsoever and send them gratuitous signals. | |
1015 | ||
1016 | Someday we could implement some reasonable scheme for | |
1017 | authorizing SIGIO and SIGURG signals properly. */ | |
1018 | ||
1019 | int d; | |
1020 | __mutex_lock (&_hurd_dtable_lock); | |
1021 | for (d = 0; (unsigned int) d < (unsigned int) _hurd_dtablesize; ++d) | |
1022 | { | |
1023 | struct hurd_userlink ulink; | |
1024 | io_t port; | |
1025 | mach_port_t asyncid; | |
1026 | if (_hurd_dtable[d] == NULL) | |
1027 | continue; | |
1028 | port = _hurd_port_get (&_hurd_dtable[d]->port, &ulink); | |
1029 | if (! __io_get_icky_async_id (port, &asyncid)) | |
1030 | { | |
1031 | if (refport == asyncid) | |
1032 | /* Break out of the loop on the next iteration. */ | |
1033 | d = -1; | |
1034 | __mach_port_deallocate (__mach_task_self (), asyncid); | |
1035 | } | |
1036 | _hurd_port_free (&_hurd_dtable[d]->port, &ulink, port); | |
1037 | } | |
1038 | /* If we found a lucky winner, we've set D to -1 in the loop. */ | |
1039 | if (d < 0) | |
1040 | goto win; | |
1041 | } | |
1042 | } | |
1043 | ||
1044 | /* If this signal is legit, we have done `goto win' by now. | |
1045 | When we return the error, mig deallocates REFPORT. */ | |
1046 | return EPERM; | |
1047 | ||
1048 | win: | |
1049 | /* Deallocate the REFPORT send right; we are done with it. */ | |
1050 | __mach_port_deallocate (__mach_task_self (), refport); | |
1051 | ||
1052 | return 0; | |
1053 | } | |
1054 | ||
1055 | /* Implement the sig_post RPC from <hurd/msg.defs>; | |
1056 | sent when someone wants us to get a signal. */ | |
1057 | kern_return_t | |
1058 | _S_msg_sig_post (mach_port_t me, | |
1059 | mach_port_t reply_port, mach_msg_type_name_t reply_port_type, | |
1060 | int signo, | |
1061 | mach_port_t refport) | |
1062 | { | |
1063 | error_t err; | |
1064 | ||
1065 | if (err = signal_allowed (signo, refport)) | |
1066 | return err; | |
1067 | ||
1068 | /* Post the signal to the designated signal-receiving thread. This will | |
1069 | reply when the signal can be considered delivered. */ | |
1070 | _hurd_internal_post_signal (_hurd_thread_sigstate (_hurd_sigthread), | |
1071 | signo, 0, 0, reply_port, reply_port_type, | |
1072 | 0); /* Stop if traced. */ | |
1073 | ||
1074 | return MIG_NO_REPLY; /* Already replied. */ | |
1075 | } | |
1076 | ||
1077 | /* Implement the sig_post_untraced RPC from <hurd/msg.defs>; | |
1078 | sent when the debugger wants us to really get a signal | |
1079 | even if we are traced. */ | |
1080 | kern_return_t | |
1081 | _S_msg_sig_post_untraced (mach_port_t me, | |
1082 | mach_port_t reply_port, | |
1083 | mach_msg_type_name_t reply_port_type, | |
1084 | int signo, | |
1085 | mach_port_t refport) | |
1086 | { | |
1087 | error_t err; | |
1088 | ||
1089 | if (err = signal_allowed (signo, refport)) | |
1090 | return err; | |
1091 | ||
1092 | /* Post the signal to the designated signal-receiving thread. This will | |
1093 | reply when the signal can be considered delivered. */ | |
1094 | _hurd_internal_post_signal (_hurd_thread_sigstate (_hurd_sigthread), | |
1095 | signo, 0, 0, reply_port, reply_port_type, | |
1096 | 1); /* Untraced flag. */ | |
1097 | ||
1098 | return MIG_NO_REPLY; /* Already replied. */ | |
1099 | } | |
1100 | \f | |
1101 | extern void __mig_init (void *); | |
1102 | ||
1103 | #include <mach/task_special_ports.h> | |
1104 | ||
1105 | /* Initialize the message port and _hurd_sigthread and start the signal | |
1106 | thread. */ | |
1107 | ||
1108 | void | |
1109 | _hurdsig_init (void) | |
1110 | { | |
1111 | error_t err; | |
1112 | vm_size_t stacksize; | |
1113 | ||
1114 | __mutex_init (&_hurd_siglock); | |
1115 | ||
a5a81fec RM |
1116 | err = __mach_port_allocate (__mach_task_self (), |
1117 | MACH_PORT_RIGHT_RECEIVE, | |
1118 | &_hurd_msgport); | |
1119 | assert_perror (err); | |
75914335 | 1120 | |
28f540f4 | 1121 | /* Make a send right to the signal port. */ |
a5a81fec RM |
1122 | err = __mach_port_insert_right (__mach_task_self (), |
1123 | _hurd_msgport, | |
1124 | _hurd_msgport, | |
1125 | MACH_MSG_TYPE_MAKE_SEND); | |
1126 | assert_perror (err); | |
28f540f4 RM |
1127 | |
1128 | /* Set the default thread to receive task-global signals | |
1129 | to this one, the main (first) user thread. */ | |
1130 | _hurd_sigthread = __mach_thread_self (); | |
1131 | ||
1132 | /* Start the signal thread listening on the message port. */ | |
1133 | ||
a5a81fec RM |
1134 | err = __thread_create (__mach_task_self (), &_hurd_msgport_thread); |
1135 | assert_perror (err); | |
28f540f4 RM |
1136 | |
1137 | stacksize = __vm_page_size * 4; /* Small stack for signal thread. */ | |
a5a81fec RM |
1138 | err = __mach_setup_thread (__mach_task_self (), _hurd_msgport_thread, |
1139 | _hurd_msgport_receive, | |
1140 | (vm_address_t *) &__hurd_sigthread_stack_base, | |
1141 | &stacksize); | |
1142 | assert_perror (err); | |
28f540f4 RM |
1143 | |
1144 | __hurd_sigthread_stack_end = __hurd_sigthread_stack_base + stacksize; | |
1145 | __hurd_sigthread_variables = | |
1146 | malloc (__hurd_threadvar_max * sizeof (unsigned long int)); | |
1147 | if (__hurd_sigthread_variables == NULL) | |
1148 | __libc_fatal ("hurd: Can't allocate thread variables for signal thread\n"); | |
1149 | ||
1150 | /* Reinitialize the MiG support routines so they will use a per-thread | |
1151 | variable for the cached reply port. */ | |
1152 | __mig_init ((void *) __hurd_sigthread_stack_base); | |
1153 | ||
a5a81fec RM |
1154 | err = __thread_resume (_hurd_msgport_thread); |
1155 | assert_perror (err); | |
75914335 | 1156 | |
28f540f4 RM |
1157 | /* Receive exceptions on the signal port. */ |
1158 | __task_set_special_port (__mach_task_self (), | |
1159 | TASK_EXCEPTION_PORT, _hurd_msgport); | |
28f540f4 RM |
1160 | } |
1161 | \f /* XXXX */ | |
1162 | /* Reauthenticate with the proc server. */ | |
1163 | ||
1164 | static void | |
1165 | reauth_proc (mach_port_t new) | |
1166 | { | |
1167 | mach_port_t ref, ignore; | |
1168 | ||
1169 | ref = __mach_reply_port (); | |
1170 | if (! HURD_PORT_USE (&_hurd_ports[INIT_PORT_PROC], | |
1171 | __proc_reauthenticate (port, ref, | |
1172 | MACH_MSG_TYPE_MAKE_SEND) || | |
1173 | __auth_user_authenticate (new, port, ref, | |
1174 | MACH_MSG_TYPE_MAKE_SEND, | |
1175 | &ignore)) | |
1176 | && ignore != MACH_PORT_NULL) | |
1177 | __mach_port_deallocate (__mach_task_self (), ignore); | |
1178 | __mach_port_destroy (__mach_task_self (), ref); | |
1179 | ||
1180 | (void) &reauth_proc; /* Silence compiler warning. */ | |
1181 | } | |
1182 | text_set_element (_hurd_reauth_hook, reauth_proc); | |
1183 | \f | |
1184 | /* Like `getenv', but safe for the signal thread to run. | |
1185 | If the environment is trashed, this will just return NULL. */ | |
1186 | ||
1187 | const char * | |
1188 | _hurdsig_getenv (const char *variable) | |
1189 | { | |
1190 | if (_hurdsig_catch_fault (SIGSEGV)) | |
1191 | /* We bombed in getenv. */ | |
1192 | return NULL; | |
1193 | else | |
1194 | { | |
1195 | const char *value = getenv (variable); | |
1196 | /* Fault now if VALUE is a bogus string. */ | |
1197 | (void) strlen (value); | |
1198 | _hurdsig_end_catch_fault (); | |
1199 | return value; | |
1200 | } | |
1201 | } |