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0fa91a0a | 1 | /* |
2 | * $Source$ | |
3 | * $Author$ | |
4 | * $Header$ | |
5 | * | |
6 | * Copyright (C) 1987 by the Massachusetts Institute of Technology | |
c801de4c | 7 | * For copying and distribution information, please see the file |
8 | * <mit-copyright.h>. | |
0fa91a0a | 9 | * |
d548a4e7 | 10 | * MOIRA server process. |
0fa91a0a | 11 | * |
12 | * Most of this is stolen from ../gdb/tsr.c | |
13 | * | |
14 | * You are in a maze of twisty little finite automata, all different. | |
15 | * Let the reader beware. | |
16 | * | |
0fa91a0a | 17 | */ |
18 | ||
d548a4e7 | 19 | static char *rcsid_mr_main_c = "$Header$"; |
0fa91a0a | 20 | |
c801de4c | 21 | #include <mit-copyright.h> |
03c05291 | 22 | #include <string.h> |
23 | #include <stdio.h> | |
589993be | 24 | #include <sys/types.h> |
70d54e43 | 25 | #include <sys/errno.h> |
70d54e43 | 26 | #include <sys/signal.h> |
554776b1 | 27 | #include <sys/wait.h> |
589993be | 28 | #include <sys/stat.h> |
03c05291 | 29 | #include <unistd.h> |
30 | #include <signal.h> | |
d548a4e7 | 31 | #include "mr_server.h" |
40165bd0 | 32 | #include <krb_et.h> |
03c05291 | 33 | #include <gdss_et.h> |
34 | #include <arpa/inet.h> | |
70d54e43 | 35 | |
0ec57336 | 36 | extern CONNECTION newconn, listencon; |
0fa91a0a | 37 | |
0ec57336 | 38 | extern int nclients; |
39 | extern client **clients, *cur_client; | |
0fa91a0a | 40 | |
0ec57336 | 41 | extern OPERATION listenop; |
42 | extern LIST_OF_OPERATIONS op_list; | |
0fa91a0a | 43 | |
0ec57336 | 44 | extern struct sockaddr_in client_addr; |
45 | extern int client_addrlen; | |
46 | extern TUPLE client_tuple; | |
0fa91a0a | 47 | |
0ec57336 | 48 | extern char *whoami; |
49 | extern char buf1[BUFSIZ]; | |
50 | extern char *takedown; | |
51 | extern int errno; | |
2f4ff9cd | 52 | extern FILE *journal; |
70d54e43 | 53 | |
0eb9f52f | 54 | extern time_t now; |
55 | ||
03c05291 | 56 | int do_listen(char *port); |
57 | void do_reset_listen(void); | |
58 | void clist_append(client *cp); | |
59 | void oplist_append(LIST_OF_OPERATIONS *oplp, OPERATION op); | |
60 | void oplist_delete(LIST_OF_OPERATIONS oplp, OPERATION op); | |
61 | void mr_setup_signals(void); | |
62 | int new_connection(void); | |
e448f08d | 63 | |
0ec57336 | 64 | /* |
d548a4e7 | 65 | * Main MOIRA server loop. |
0ec57336 | 66 | * |
67 | * Initialize the world, then start accepting connections and | |
68 | * making progress on current connections. | |
69 | */ | |
0fa91a0a | 70 | |
0ec57336 | 71 | /*ARGSUSED*/ |
03c05291 | 72 | int main(argc, argv) |
73 | int argc; | |
74 | char **argv; | |
0fa91a0a | 75 | { |
cfbc1e92 | 76 | int status, i; |
0eb9f52f | 77 | time_t tardy; |
cfbc1e92 | 78 | char *port; |
79 | extern char *database; | |
589993be | 80 | struct stat stbuf; |
0ec57336 | 81 | |
82 | whoami = argv[0]; | |
83 | /* | |
84 | * Error handler init. | |
85 | */ | |
40165bd0 | 86 | initialize_sms_error_table(); |
87 | initialize_krb_error_table(); | |
adae415b | 88 | initialize_gdss_error_table(); |
d548a4e7 | 89 | set_com_err_hook(mr_com_err); |
03c05291 | 90 | setvbuf(stderr, NULL, _IOLBF, BUFSIZ); |
91 | ||
92 | port = strchr(MOIRA_SERVER, ':') + 1; | |
cfbc1e92 | 93 | |
94 | for (i = 1; i < argc; i++) { | |
95 | if (!strcmp(argv[i], "-db") && i+1 < argc) { | |
96 | database = argv[i+1]; | |
97 | i++; | |
98 | } else if (!strcmp(argv[i], "-p") && i+1 < argc) { | |
99 | port = argv[i+1]; | |
100 | i++; | |
101 | } else { | |
102 | com_err(whoami, 0, "Usage: moirad [-db database][-p port]"); | |
0ec57336 | 103 | exit(1); |
cfbc1e92 | 104 | } |
105 | } | |
f5c72293 | 106 | |
0ec57336 | 107 | /* |
108 | * GDB initialization. | |
109 | */ | |
5dbd09a0 | 110 | if(gdb_init() != 0) { |
111 | com_err(whoami, 0, "GDB initialization failed."); | |
112 | exit(1); | |
113 | } | |
7f024a70 | 114 | gdb_debug(0); /* this can be patched, if necessary, to enable */ |
115 | /* GDB level debugging .. */ | |
4a06eb54 | 116 | krb_realm = malloc(REALM_SZ); |
42b1d0ae | 117 | krb_get_lrealm(krb_realm, 1); |
7f024a70 | 118 | |
f6cc38de | 119 | /* |
083a6e94 | 120 | * Database initialization. Only init if database should be open. |
f6cc38de | 121 | */ |
122 | ||
d548a4e7 | 123 | if (stat(MOIRA_MOTD_FILE, &stbuf) != 0) { |
124 | if ((status = mr_open_database()) != 0) { | |
2f4ff9cd | 125 | com_err(whoami, status, " when trying to open database."); |
f6cc38de | 126 | exit(1); |
083a6e94 | 127 | } |
128 | sanity_check_database(); | |
129 | } else { | |
130 | dormant = ASLEEP; | |
131 | com_err(whoami, 0, "sleeping, not opening database"); | |
f6cc38de | 132 | } |
133 | ||
2f4ff9cd | 134 | sanity_check_queries(); |
2f4ff9cd | 135 | |
0ec57336 | 136 | /* |
137 | * Set up client array handler. | |
138 | */ | |
0fa91a0a | 139 | nclients = 0; |
140 | clients = (client **) malloc(0); | |
70d54e43 | 141 | |
d548a4e7 | 142 | mr_setup_signals(); |
0ec57336 | 143 | |
2f4ff9cd | 144 | journal = fopen(JOURNAL, "a"); |
145 | if (journal == NULL) { | |
146 | com_err(whoami, errno, " while opening journal file"); | |
147 | exit(1); | |
148 | } | |
149 | ||
0ec57336 | 150 | /* |
151 | * Establish template connection. | |
152 | */ | |
cfbc1e92 | 153 | if ((status = do_listen(port)) != 0) { |
0ec57336 | 154 | com_err(whoami, status, |
2f4ff9cd | 155 | " while trying to create listening connection"); |
0ec57336 | 156 | exit(1); |
157 | } | |
0fa91a0a | 158 | |
0fa91a0a | 159 | op_list = create_list_of_operations(1, listenop); |
0fa91a0a | 160 | |
b4182127 | 161 | com_err(whoami, 0, "started (pid %d)", getpid()); |
d548a4e7 | 162 | com_err(whoami, 0, rcsid_mr_main_c); |
083a6e94 | 163 | if (dormant != ASLEEP) |
d548a4e7 | 164 | send_zgram("MOIRA", "server started"); |
083a6e94 | 165 | else |
d548a4e7 | 166 | send_zgram("MOIRA", "server started, but database closed"); |
0ec57336 | 167 | |
168 | /* | |
169 | * Run until shut down. | |
170 | */ | |
70d54e43 | 171 | while(!takedown) { |
0ec57336 | 172 | register int i; |
173 | /* | |
174 | * Block until something happens. | |
175 | */ | |
5dbd09a0 | 176 | #ifdef notdef |
177 | com_err(whoami, 0, "tick"); | |
178 | #endif notdef | |
589993be | 179 | if (dormant == SLEEPY) { |
d548a4e7 | 180 | mr_close_database(); |
589993be | 181 | com_err(whoami, 0, "database closed"); |
d548a4e7 | 182 | mr_setup_signals(); |
183 | send_zgram("MOIRA", "database closed"); | |
589993be | 184 | dormant = ASLEEP; |
185 | } else if (dormant == GROGGY) { | |
d548a4e7 | 186 | mr_open_database(); |
589993be | 187 | com_err(whoami, 0, "database open"); |
d548a4e7 | 188 | mr_setup_signals(); |
189 | send_zgram("MOIRA", "database open again"); | |
589993be | 190 | dormant = AWAKE; |
191 | } | |
192 | ||
5dbd09a0 | 193 | errno = 0; |
194 | status = op_select_any(op_list, 0, | |
195 | (fd_set *)NULL, (fd_set *)NULL, | |
196 | (fd_set *)NULL, (struct timeval *)NULL); | |
197 | ||
198 | if (status == -1) { | |
42b1d0ae | 199 | if (errno != EINTR) |
200 | com_err(whoami, errno, " error from op_select"); | |
2e182bc3 | 201 | if (!inc_running || now - inc_started > INC_TIMEOUT) |
202 | next_incremental(); | |
5dbd09a0 | 203 | continue; |
204 | } else if (status != -2) { | |
2f4ff9cd | 205 | com_err(whoami, 0, " wrong return from op_select_any"); |
5dbd09a0 | 206 | continue; |
207 | } | |
70d54e43 | 208 | if (takedown) break; |
0eb9f52f | 209 | time(&now); |
2e182bc3 | 210 | if (!inc_running || now - inc_started > INC_TIMEOUT) |
211 | next_incremental(); | |
70d54e43 | 212 | #ifdef notdef |
213 | fprintf(stderr, " tick\n"); | |
214 | #endif notdef | |
b4182127 | 215 | /* |
216 | * Handle any new connections; this comes first so | |
217 | * errno isn't tromped on. | |
218 | */ | |
219 | if (OP_DONE(listenop)) { | |
220 | if (OP_STATUS(listenop) == OP_CANCELLED) { | |
221 | if (errno == EWOULDBLOCK) { | |
222 | do_reset_listen(); | |
223 | } else { | |
14e2d5ce | 224 | static int count = 0; |
b4182127 | 225 | com_err(whoami, errno, |
14e2d5ce | 226 | " error (%d) on listen", count); |
227 | if (count++ > 10) | |
228 | exit(1); | |
b4182127 | 229 | } |
230 | } else if ((status = new_connection()) != 0) { | |
231 | com_err(whoami, errno, | |
2f4ff9cd | 232 | " Error on listening operation."); |
b4182127 | 233 | /* |
234 | * Sleep here to prevent hosing? | |
235 | */ | |
236 | } | |
589993be | 237 | /* if the new connection is our only connection, |
238 | * and the server is supposed to be down, then go | |
239 | * down now. | |
240 | */ | |
241 | if ((dormant == AWAKE) && (nclients == 1) && | |
d548a4e7 | 242 | (stat(MOIRA_MOTD_FILE, &stbuf) == 0)) { |
589993be | 243 | com_err(whoami, 0, "motd file exists, slumbertime"); |
244 | dormant = SLEEPY; | |
245 | } | |
246 | /* on new connection, if we are no longer supposed | |
247 | * to be down, then wake up. | |
248 | */ | |
249 | if ((dormant == ASLEEP) && | |
d548a4e7 | 250 | (stat(MOIRA_MOTD_FILE, &stbuf) == -1) && |
589993be | 251 | (errno == ENOENT)) { |
252 | com_err(whoami, 0, "motd file no longer exists, waking up"); | |
253 | dormant = GROGGY; | |
254 | } | |
255 | ||
b4182127 | 256 | } |
0ec57336 | 257 | /* |
258 | * Handle any existing connections. | |
259 | */ | |
0eb9f52f | 260 | tardy = now - 30*60; |
261 | ||
0fa91a0a | 262 | for (i=0; i<nclients; i++) { |
0eb9f52f | 263 | cur_client = clients[i]; |
0fa91a0a | 264 | if (OP_DONE(clients[i]->pending_op)) { |
0eb9f52f | 265 | cur_client->last_time_used = now; |
70d54e43 | 266 | do_client(cur_client); |
0eb9f52f | 267 | } else if (clients[i]->last_time_used < tardy) { |
268 | com_err(whoami, 0, "Shutting down connection due to inactivity"); | |
03c05291 | 269 | shutdown(cur_client->con->in.fd, 2); |
0fa91a0a | 270 | } |
0eb9f52f | 271 | cur_client = NULL; |
272 | if (takedown) break; | |
0fa91a0a | 273 | } |
0fa91a0a | 274 | } |
b4182127 | 275 | com_err(whoami, 0, "%s", takedown); |
d548a4e7 | 276 | mr_close_database(); |
277 | send_zgram("MOIRA", takedown); | |
0ec57336 | 278 | return 0; |
70d54e43 | 279 | } |
280 | ||
0ec57336 | 281 | /* |
282 | * Set up the template connection and queue the first accept. | |
283 | */ | |
284 | ||
03c05291 | 285 | int do_listen(port) |
286 | char *port; | |
70d54e43 | 287 | { |
cfbc1e92 | 288 | listencon = create_listening_connection(port); |
0ec57336 | 289 | |
290 | if (listencon == NULL) | |
291 | return errno; | |
292 | ||
293 | listenop = create_operation(); | |
294 | client_addrlen = sizeof(client_addr); | |
295 | ||
296 | start_accepting_client(listencon, listenop, &newconn, | |
297 | (char *)&client_addr, | |
298 | &client_addrlen, &client_tuple); | |
299 | return 0; | |
0fa91a0a | 300 | } |
301 | ||
b4182127 | 302 | |
03c05291 | 303 | void do_reset_listen(void) |
b4182127 | 304 | { |
305 | client_addrlen = sizeof(client_addr); | |
306 | start_accepting_client(listencon, listenop, &newconn, | |
307 | (char *)&client_addr, | |
308 | &client_addrlen, &client_tuple); | |
309 | } | |
310 | ||
0ec57336 | 311 | /* |
312 | * This routine is called when a new connection comes in. | |
313 | * | |
314 | * It sets up a new client and adds it to the list of currently active clients. | |
315 | */ | |
03c05291 | 316 | int new_connection(void) |
0fa91a0a | 317 | { |
7f024a70 | 318 | register client *cp; |
70d54e43 | 319 | static counter = 0; |
0fa91a0a | 320 | |
0fa91a0a | 321 | /* |
322 | * Make sure there's been no error | |
323 | */ | |
c27b3454 | 324 | if(OP_STATUS(listenop) != OP_COMPLETE) { |
0ec57336 | 325 | return errno; |
c27b3454 | 326 | } |
327 | ||
328 | if (newconn == NULL) { | |
d548a4e7 | 329 | return MR_NOT_CONNECTED; |
0fa91a0a | 330 | } |
331 | ||
0fa91a0a | 332 | /* |
333 | * Set up the new connection and reply to the client | |
334 | */ | |
7f024a70 | 335 | cp = (client *)malloc(sizeof *cp); |
03c05291 | 336 | memset(cp, 0, sizeof(*cp)); |
0fa91a0a | 337 | cp->action = CL_ACCEPT; |
338 | cp->con = newconn; | |
70d54e43 | 339 | cp->id = counter++; |
0ec57336 | 340 | cp->args = NULL; |
42b1d0ae | 341 | cp->clname[0] = NULL; |
d548a4e7 | 342 | cp->reply.mr_argv = NULL; |
4a06eb54 | 343 | cp->first = NULL; |
344 | cp->last = NULL; | |
0eb9f52f | 345 | cp->last_time_used = now; |
0fa91a0a | 346 | newconn = NULL; |
347 | ||
348 | cp->pending_op = create_operation(); | |
349 | reset_operation(cp->pending_op); | |
350 | oplist_append(&op_list, cp->pending_op); | |
70d54e43 | 351 | cur_client = cp; |
352 | ||
0ec57336 | 353 | /* |
354 | * Add a new client to the array.. | |
355 | */ | |
356 | clist_append(cp); | |
357 | ||
358 | /* | |
359 | * Let him know we heard him. | |
360 | */ | |
0fa91a0a | 361 | start_replying_to_client(cp->pending_op, cp->con, GDB_ACCEPTED, |
362 | "", ""); | |
0ec57336 | 363 | |
364 | cp->haddr = client_addr; | |
365 | ||
366 | /* | |
367 | * Log new connection. | |
368 | */ | |
369 | ||
b4182127 | 370 | com_err(whoami, 0, "New connection from %s port %d (now %d client%s)", |
371 | inet_ntoa(cp->haddr.sin_addr), | |
372 | (int)ntohs(cp->haddr.sin_port), | |
373 | nclients, | |
374 | nclients!=1?"s":""); | |
0fa91a0a | 375 | |
376 | /* | |
0ec57336 | 377 | * Get ready to accept the next connection. |
0fa91a0a | 378 | */ |
379 | reset_operation(listenop); | |
0ec57336 | 380 | client_addrlen = sizeof(client_addr); |
0fa91a0a | 381 | |
382 | start_accepting_client(listencon, listenop, &newconn, | |
0ec57336 | 383 | (char *)&client_addr, |
384 | &client_addrlen, &client_tuple); | |
385 | return 0; | |
0fa91a0a | 386 | } |
387 | ||
0fa91a0a | 388 | /* |
389 | * Add a new client to the known clients. | |
390 | */ | |
03c05291 | 391 | void clist_append(cp) |
392 | client *cp; | |
0fa91a0a | 393 | { |
394 | client **clients_n; | |
395 | ||
396 | nclients++; | |
0ec57336 | 397 | clients_n = (client **)malloc |
398 | ((unsigned)(nclients * sizeof(client *))); | |
03c05291 | 399 | memcpy((char *)clients_n, (char *)clients, (nclients-1)*sizeof(cp)); |
0fa91a0a | 400 | clients_n[nclients-1] = cp; |
401 | free((char *)clients); | |
402 | clients = clients_n; | |
403 | clients_n = NULL; | |
404 | } | |
405 | ||
70d54e43 | 406 | |
03c05291 | 407 | void clist_delete(cp) |
408 | client *cp; | |
70d54e43 | 409 | { |
70d54e43 | 410 | client **clients_n, **scpp, **dcpp; /* source and dest client */ |
411 | /* ptr ptr */ | |
412 | ||
70d54e43 | 413 | int found_it = 0; |
414 | ||
0ec57336 | 415 | clients_n = (client **)malloc |
416 | ((unsigned)((nclients - 1)* sizeof(client *))); | |
70d54e43 | 417 | for (scpp = clients, dcpp = clients_n; scpp < clients+nclients; ) { |
418 | if (*scpp != cp) { | |
419 | *dcpp++ = *scpp++; | |
420 | } else { | |
421 | scpp++; | |
422 | if (found_it) abort(); | |
423 | found_it = 1; | |
424 | } | |
425 | } | |
426 | --nclients; | |
427 | free((char *)clients); | |
428 | clients = clients_n; | |
429 | clients_n = NULL; | |
c27b3454 | 430 | oplist_delete(op_list, cp->pending_op); |
70d54e43 | 431 | reset_operation(cp->pending_op); |
432 | delete_operation(cp->pending_op); | |
7f024a70 | 433 | sever_connection(cp->con); |
0ec57336 | 434 | free((char *)cp); |
70d54e43 | 435 | } |
0ec57336 | 436 | |
0fa91a0a | 437 | /* |
0ec57336 | 438 | * Add a new operation to a list of operations. |
439 | * | |
440 | * This should be rewritten to use realloc instead, since in most | |
441 | * cases it won't have to copy the array. | |
0fa91a0a | 442 | */ |
443 | ||
03c05291 | 444 | void oplist_append(oplp, op) |
445 | LIST_OF_OPERATIONS *oplp; | |
446 | OPERATION op; | |
0fa91a0a | 447 | { |
448 | int count = (*oplp)->count+1; | |
449 | LIST_OF_OPERATIONS newlist = (LIST_OF_OPERATIONS) | |
450 | db_alloc(size_of_list_of_operations(count)); | |
03c05291 | 451 | memcpy((char *)newlist, (char *)(*oplp), |
0fa91a0a | 452 | size_of_list_of_operations((*oplp)->count)); |
0fa91a0a | 453 | newlist->count++; |
454 | newlist->op[count-1] = op; | |
467f5982 | 455 | db_free((char *)(*oplp), size_of_list_of_operations(count-1)); |
0fa91a0a | 456 | (*oplp) = newlist; |
457 | } | |
458 | ||
c27b3454 | 459 | |
03c05291 | 460 | void oplist_delete(oplp, op) |
461 | LIST_OF_OPERATIONS oplp; | |
462 | OPERATION op; | |
c27b3454 | 463 | { |
464 | register OPERATION *s; | |
465 | register int c; | |
466 | ||
467 | for (s = oplp->op, c=oplp->count; c; --c, ++s) { | |
468 | if (*s == op) { | |
469 | while (c > 0) { | |
470 | *s = *(s+1); | |
471 | ++s; | |
472 | --c; | |
473 | } | |
474 | oplp->count--; | |
475 | return; | |
476 | } | |
477 | } | |
478 | abort(); | |
479 | } | |
554776b1 | 480 | |
481 | ||
03c05291 | 482 | void reapchild(x) |
483 | int x; | |
554776b1 | 484 | { |
03c05291 | 485 | int status, pid; |
554776b1 | 486 | |
03c05291 | 487 | while ((pid = waitpid(-1, &status, WNOHANG)) > 0) { |
488 | #ifdef INCR_DEBUG | |
489 | com_err(whoami, 0, "Reaping %d (inc_pid=%d, inc_running=%d)", | |
490 | pid, inc_pid, inc_running); | |
491 | #endif | |
2e182bc3 | 492 | if (pid == inc_pid) |
493 | inc_running = 0; | |
03c05291 | 494 | if (!takedown && (WTERMSIG(status)!= 0 || WEXITSTATUS(status)!= 0)) |
495 | com_err(whoami, 0, "%d: child exits with signal %d status %d", | |
496 | pid, WTERMSIG(status), WEXITSTATUS(status)); | |
554776b1 | 497 | } |
498 | } | |
589993be | 499 | |
500 | ||
03c05291 | 501 | void godormant(x) |
502 | int x; | |
589993be | 503 | { |
504 | switch (dormant) { | |
505 | case AWAKE: | |
506 | case GROGGY: | |
507 | com_err(whoami, 0, "requested to go dormant"); | |
508 | break; | |
509 | case ASLEEP: | |
510 | com_err(whoami, 0, "already asleep"); | |
511 | break; | |
512 | case SLEEPY: | |
513 | break; | |
514 | } | |
515 | dormant = SLEEPY; | |
516 | } | |
517 | ||
518 | ||
03c05291 | 519 | void gowakeup(x) |
520 | int x; | |
589993be | 521 | { |
522 | switch (dormant) { | |
523 | case ASLEEP: | |
524 | case SLEEPY: | |
525 | com_err(whoami, 0, "Good morning"); | |
526 | break; | |
527 | case AWAKE: | |
528 | com_err(whoami, 0, "already awake"); | |
529 | break; | |
530 | case GROGGY: | |
531 | break; | |
532 | } | |
533 | dormant = GROGGY; | |
534 | } | |
083a6e94 | 535 | |
536 | ||
03c05291 | 537 | void mr_setup_signals(void) |
083a6e94 | 538 | { |
03c05291 | 539 | struct sigaction action; |
540 | ||
541 | action.sa_flags = 0; | |
542 | sigemptyset(&action.sa_mask); | |
543 | ||
083a6e94 | 544 | /* There should probably be a few more of these. */ |
545 | ||
03c05291 | 546 | action.sa_handler = sigshut; |
547 | if ((sigaction(SIGTERM, &action, NULL) < 0) || | |
548 | (sigaction(SIGINT, &action, NULL) < 0) || | |
549 | (sigaction(SIGHUP, &action, NULL) < 0)) { | |
550 | com_err(whoami, errno, "Unable to establish signal handlers."); | |
551 | exit(1); | |
083a6e94 | 552 | } |
e448f08d | 553 | |
03c05291 | 554 | action.sa_handler = godormant; |
555 | if (sigaction(SIGUSR1, &action, NULL) < 0) { | |
556 | com_err(whoami, errno, "Unable to establish signal handlers."); | |
557 | exit(1); | |
558 | } | |
e448f08d | 559 | |
03c05291 | 560 | action.sa_handler = gowakeup; |
561 | if (sigaction(SIGUSR2, &action, NULL) < 0) { | |
562 | com_err(whoami, errno, "Unable to establish signal handlers."); | |
563 | exit(1); | |
564 | } | |
e448f08d | 565 | |
03c05291 | 566 | action.sa_handler = reapchild; |
567 | sigaddset(&action.sa_mask, SIGCHLD); | |
568 | if (sigaction(SIGCHLD, &action, NULL) < 0) { | |
569 | com_err(whoami, errno, "Unable to establish signal handlers."); | |
570 | exit(1); | |
571 | } | |
572 | } |