client.c

   1 /* Copyright (C) 1997 Andre Noll <maan@tuebingen.mpg.de>, see file COPYING. */
   2
   3 /** \file client.c The client program used to connect to para_server. */
   4
   5 #include <regex.h>
   6 #include <signal.h>
   7 #include <lopsub.h>
   8
   9 #include "client.lsg.h"
  10 #include "para.h"
  11 #include "list.h"
  12 #include "sched.h"
  13 #include "crypt.h"
  14 #include "string.h"
  15 #include "stdin.h"
  16 #include "stdout.h"
  17 #include "client.h"
  18 #include "buffer_tree.h"
  19 #include "error.h"
  20 #include "version.h"
  21
  22 /** Array of error strings. */
  23 DEFINE_PARA_ERRLIST;
  24
  25 static struct sched sched;
  26 static struct client_task *ct;
  27 static struct stdin_task sit;
  28 static struct stdout_task sot;
  29
  30 static int client_loglevel = LL_ERROR;
  31 DEFINE_STDERR_LOGGER(stderr_log, client_loglevel);
  32 __printf_2_3 void (*para_log)(int, const char*, ...) = stderr_log;
  33
  34 #ifdef HAVE_READLINE
  35 #include "interactive.h"
  36 #include "server_cmd.lsg.h"
  37
  38 struct exec_task {
  39         struct task *task;
  40         struct btr_node *btrn;
  41         char *result_buf;
  42         size_t result_size;
  43 };
  44
  45 static void exec_pre_monitor(struct sched *s, void *context)
  46 {
  47         struct exec_task *et = context;
  48         int ret = btr_node_status(et->btrn, 0, BTR_NT_LEAF);
  49
  50         if (ret != 0)
  51                 sched_min_delay(s);
  52 }
  53
  54 static int exec_post_monitor(__a_unused struct sched *s, void *context)
  55 {
  56         struct exec_task *et = context;
  57         struct btr_node *btrn = et->btrn;
  58         char *buf;
  59         size_t sz;
  60         int ret;
  61
  62         ret = btr_node_status(btrn, 0, BTR_NT_LEAF);
  63         if (ret <= 0)
  64                 return ret;
  65         sz = btr_next_buffer(btrn, &buf);
  66         if (sz <= 1)
  67                 goto out;
  68         et->result_buf = para_realloc(et->result_buf, et->result_size + sz - 1);
  69         memcpy(et->result_buf + et->result_size - 1, buf, sz -  1);
  70         et->result_size += sz - 1;
  71         et->result_buf[et->result_size - 1] = '\0';
  72 out:
  73         btr_consume(btrn, sz);
  74         return 0;
  75 }
  76
  77 /* Called from the line handler and the completers. This overwrites ct->lpr. */
  78 static int create_merged_lpr(const char *line)
  79 {
  80         const struct lls_command *cmd = CLIENT_CMD_PTR;
  81         int argc, ret;
  82         char *cmdline, **argv, *errctx;
  83         struct lls_parse_result *argv_lpr;
  84         static struct lls_parse_result *orig_lpr;
  85
  86         if (!orig_lpr)
  87                 orig_lpr = ct->lpr;
  88         ct->lpr = NULL;
  89         cmdline = make_message("-- %s", line);
  90         ret = create_shifted_argv(cmdline, " ", &argv);
  91         free(cmdline);
  92         if (ret < 0)
  93                 return ret;
  94         argc = ret;
  95         if (argc == 2) { /* no words (only blanks in line) */
  96                 free_argv(argv);
  97                 return 0;
  98         }
  99         argv[0] = para_strdup("--");
 100         /*
 101          * The original lpr for the interactive session has no non-option
 102          * arguments. We create a fresh lpr from the words in "line" and merge
 103          * it with the original lpr.
 104          */
 105         ret = lls(lls_parse(argc, argv, cmd, &argv_lpr, &errctx));
 106         free_argv(argv);
 107         if (ret < 0)
 108                 goto fail;
 109         ret = lls(lls_merge(orig_lpr, argv_lpr, cmd, &ct->lpr, &errctx));
 110         lls_free_parse_result(argv_lpr, cmd);
 111         if (ret < 0)
 112                 goto fail;
 113         return 1;
 114 fail:
 115         if (errctx)
 116                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 117         free(errctx);
 118         assert(ret < 0);
 119         return ret;
 120 }
 121
 122 /* called from completers */
 123 static int execute_client_command(const char *cmd, char **result)
 124 {
 125         int ret;
 126         struct sched command_sched = {.default_timeout = 1000};
 127         struct exec_task exec_task = {
 128                 .result_buf = para_strdup(""),
 129                 .result_size = 1,
 130         };
 131         struct lls_parse_result *old_lpr = ct->lpr;
 132
 133         *result = NULL;
 134         ret = create_merged_lpr(cmd);
 135         if (ret <= 0)
 136                 goto out;
 137         exec_task.btrn = btr_new_node(&(struct btr_node_description)
 138                 EMBRACE(.name = "exec_collect"));
 139         exec_task.task = task_register(&(struct task_info) {
 140                 .name = "client exec",
 141                 .pre_monitor = exec_pre_monitor,
 142                 .post_monitor = exec_post_monitor,
 143                 .context = &exec_task,
 144         }, &command_sched);
 145         ret = client_connect(ct, &command_sched, NULL, exec_task.btrn);
 146         if (ret < 0)
 147                 goto out;
 148         schedule(&command_sched);
 149         sched_shutdown(&command_sched);
 150         lls_free_parse_result(ct->lpr, CLIENT_CMD_PTR);
 151         ct->lpr = old_lpr;
 152         *result = exec_task.result_buf;
 153         btr_remove_node(&exec_task.btrn);
 154         ret = 1;
 155 out:
 156         btr_remove_node(&exec_task.btrn);
 157         if (ret < 0)
 158                 free(exec_task.result_buf);
 159         return ret;
 160 }
 161
 162 static int extract_matches_from_command(const char *word, char *cmd,
 163                 char ***matches)
 164 {
 165         char *buf, **sl;
 166         int ret;
 167
 168         ret = execute_client_command(cmd, &buf);
 169         if (ret < 0)
 170                 return ret;
 171         ret = create_argv(buf, "\n", &sl);
 172         free(buf);
 173         if (ret < 0)
 174                 return ret;
 175         ret = i9e_extract_completions(word, sl, matches);
 176         free_argv(sl);
 177         return ret;
 178 }
 179
 180 static int complete_attributes(const char *word, char ***matches)
 181 {
 182         return extract_matches_from_command(word, "lsatt", matches);
 183 }
 184
 185 static void complete_addblob(__a_unused const char *blob_type,
 186                 __a_unused struct i9e_completion_info *ci,
 187                 __a_unused struct i9e_completion_result *cr)
 188 {
 189         cr->filename_completion_desired = true;
 190 }
 191
 192 static void generic_blob_complete(const char *blob_type,
 193                 struct i9e_completion_info *ci,
 194                 struct i9e_completion_result *cr)
 195 {
 196         char cmd[20];
 197         sprintf(cmd, "ls%s", blob_type);
 198         extract_matches_from_command(ci->word, cmd, &cr->matches);
 199 }
 200
 201 static void complete_catblob(const char *blob_type,
 202                 struct i9e_completion_info *ci,
 203                 struct i9e_completion_result *cr)
 204 {
 205         generic_blob_complete(blob_type, ci, cr);
 206 }
 207
 208 static void complete_lsblob(const char *blob_type,
 209                 struct i9e_completion_info *ci,
 210                 struct i9e_completion_result *cr)
 211 {
 212         char *opts[] = {LSG_SERVER_CMD_LSIMG_OPTS, NULL};
 213
 214         if (ci->word[0] == '-')
 215                 return i9e_complete_option(opts, ci, cr);
 216         generic_blob_complete(blob_type, ci, cr);
 217 }
 218
 219 static void complete_rmblob(const char *blob_type,
 220                 struct i9e_completion_info *ci,
 221                 struct i9e_completion_result *cr)
 222 {
 223         generic_blob_complete(blob_type, ci, cr);
 224 }
 225
 226 static void complete_mvblob(const char *blob_type,
 227                 struct i9e_completion_info *ci,
 228                 struct i9e_completion_result *cr)
 229 {
 230         generic_blob_complete(blob_type, ci, cr);
 231 }
 232
 233 /* these don't need any completions */
 234 I9E_DUMMY_COMPLETER(ff);
 235 I9E_DUMMY_COMPLETER(hup);
 236 I9E_DUMMY_COMPLETER(jmp);
 237 I9E_DUMMY_COMPLETER(next);
 238 I9E_DUMMY_COMPLETER(nomore);
 239 I9E_DUMMY_COMPLETER(pause);
 240 I9E_DUMMY_COMPLETER(play);
 241 I9E_DUMMY_COMPLETER(si);
 242 I9E_DUMMY_COMPLETER(term);
 243 I9E_DUMMY_COMPLETER(stop);
 244 I9E_DUMMY_COMPLETER(addatt);
 245 I9E_DUMMY_COMPLETER(init);
 246
 247 static struct i9e_completer completers[];
 248
 249 static void ll_completer(struct i9e_completion_info *ci,
 250                 struct i9e_completion_result *cr)
 251 {
 252         i9e_ll_completer(ci, cr);
 253 }
 254
 255 static void help_completer(struct i9e_completion_info *ci,
 256                 struct i9e_completion_result *cr)
 257 {
 258         char *opts[] = {LSG_SERVER_CMD_HELP_OPTS, NULL};
 259
 260         if (ci->word[0] == '-') {
 261                 i9e_complete_option(opts, ci, cr);
 262                 return;
 263         }
 264         cr->matches = i9e_complete_commands(ci->word, completers);
 265 }
 266
 267 static void stat_completer(struct i9e_completion_info *ci,
 268                 struct i9e_completion_result *cr)
 269 {
 270         char *opts[] = {LSG_SERVER_CMD_STAT_OPTS, NULL};
 271         i9e_complete_option(opts, ci, cr);
 272 }
 273
 274 static void version_completer(struct i9e_completion_info *ci,
 275                 struct i9e_completion_result *cr)
 276 {
 277         char *opts[] = {LSG_SERVER_CMD_VERSION_OPTS, NULL};
 278         i9e_complete_option(opts, ci, cr);
 279 }
 280
 281 static void sender_completer(struct i9e_completion_info *ci,
 282                 struct i9e_completion_result *cr)
 283 {
 284         char *senders[] = {"http", "dccp", "udp", NULL};
 285         char *http_cmds[] = {"on", "off", "allow", "deny", "help", NULL};
 286         char *dccp_cmds[] = {"on", "off", "allow", "deny", "help", NULL};
 287         char *udp_cmds[] ={"on", "off", "add", "delete", "help", NULL};
 288         char *sender;
 289         char **cmds;
 290
 291         //PARA_CRIT_LOG("wn: %d\n", ci->word_num);
 292         if (ci->word_num == 0 || ci->word_num > 3)
 293                 return;
 294         if (ci->word_num == 1 || (ci->word_num == 2 && *ci->word != '\0')) {
 295                 i9e_extract_completions(ci->word, senders, &cr->matches);
 296                 return;
 297         }
 298         sender = ci->argv[1];
 299         //PARA_CRIT_LOG("sender: %s\n", sender);
 300         if (strcmp(sender, "http") == 0)
 301                 cmds = http_cmds;
 302         else if (strcmp(sender, "dccp") == 0)
 303                 cmds = dccp_cmds;
 304         else if (strcmp(sender, "udp") == 0)
 305                 cmds = udp_cmds;
 306         else
 307                 return;
 308         i9e_extract_completions(ci->word, cmds, &cr->matches);
 309 }
 310
 311 static void add_completer(struct i9e_completion_info *ci,
 312                 struct i9e_completion_result *cr)
 313 {
 314         char *opts[] = {LSG_SERVER_CMD_ADD_OPTS, NULL};
 315
 316         if (ci->word[0] == '-')
 317                 i9e_complete_option(opts, ci, cr);
 318         cr->filename_completion_desired = true;
 319 }
 320
 321 static void ls_completer(struct i9e_completion_info *ci,
 322                 struct i9e_completion_result *cr)
 323 {
 324         char *opts[] = {LSG_SERVER_CMD_LS_OPTS, NULL};
 325         if (ci->word[0] == '-')
 326                 i9e_complete_option(opts, ci, cr);
 327         cr->filename_completion_desired = true;
 328 }
 329
 330 static void setatt_completer(struct i9e_completion_info *ci,
 331                 struct i9e_completion_result *cr)
 332 {
 333         char *buf, **sl;
 334         int i, ret, num_atts;
 335
 336         if (ci->word_num == 0)
 337                 return;
 338
 339         if (*ci->word == '/' || *ci->word == '\0')
 340                 cr->filename_completion_desired = true;
 341         if (*ci->word == '/')
 342                 return;
 343         ret = execute_client_command("lsatt", &buf);
 344         if (ret < 0)
 345                 return;
 346         ret = create_argv(buf, "\n", &sl);
 347         if (ret < 0)
 348                 goto out;
 349         num_atts = ret;
 350         sl = para_realloc(sl, (2 * num_atts + 1) * sizeof(char *));
 351         for (i = 0; i < num_atts; i++) {
 352                 char *orig = sl[i];
 353                 sl[i] = make_message("%s+", orig);
 354                 sl[num_atts + i] = make_message("%s-", orig);
 355                 free(orig);
 356         }
 357         sl[2 * num_atts] = NULL;
 358         i9e_extract_completions(ci->word, sl, &cr->matches);
 359 out:
 360         free(buf);
 361         free_argv(sl);
 362 }
 363
 364 static void lsatt_completer(struct i9e_completion_info *ci,
 365                 struct i9e_completion_result *cr)
 366 {
 367         char *opts[] = {LSG_SERVER_CMD_LSATT_OPTS, NULL};
 368         i9e_complete_option(opts, ci, cr);
 369 }
 370
 371 static void mvatt_completer(struct i9e_completion_info *ci,
 372                 struct i9e_completion_result *cr)
 373 {
 374         complete_attributes(ci->word, &cr->matches);
 375 }
 376
 377 static void rmatt_completer(struct i9e_completion_info *ci,
 378                 struct i9e_completion_result *cr)
 379 {
 380         complete_attributes(ci->word, &cr->matches);
 381 }
 382
 383 static void check_completer(struct i9e_completion_info *ci,
 384                 struct i9e_completion_result *cr)
 385 {
 386         char *opts[] = {LSG_SERVER_CMD_CHECK_OPTS, NULL};
 387         i9e_complete_option(opts, ci, cr);
 388 }
 389
 390 static void rm_completer(struct i9e_completion_info *ci,
 391                 struct i9e_completion_result *cr)
 392 {
 393         char *opts[] = {LSG_SERVER_CMD_RM_OPTS, NULL};
 394
 395         if (ci->word[0] == '-') {
 396                 i9e_complete_option(opts, ci, cr);
 397                 return;
 398         }
 399         cr->filename_completion_desired = true;
 400 }
 401
 402 static void touch_completer(struct i9e_completion_info *ci,
 403                 struct i9e_completion_result *cr)
 404 {
 405         char *opts[] = {LSG_SERVER_CMD_TOUCH_OPTS, NULL};
 406
 407         if (ci->word[0] == '-')
 408                 i9e_complete_option(opts, ci, cr);
 409         cr->filename_completion_desired = true;
 410 }
 411
 412 static void cpsi_completer(struct i9e_completion_info *ci,
 413                 struct i9e_completion_result *cr)
 414 {
 415         char *opts[] = {LSG_SERVER_CMD_CPSI_OPTS, NULL};
 416
 417         if (ci->word[0] == '-')
 418                 i9e_complete_option(opts, ci, cr);
 419         cr->filename_completion_desired = true;
 420 }
 421
 422 static void select_completer(struct i9e_completion_info *ci,
 423                 struct i9e_completion_result *cr)
 424 {
 425         char *mood_buf, *pl_buf, **moods, **playlists, **mops;
 426         int num_moods, num_pl, i, n, ret;
 427
 428         ret = execute_client_command("lsmood", &mood_buf);
 429         if (ret < 0)
 430                 return;
 431         ret = execute_client_command("lspl", &pl_buf);
 432         if (ret < 0)
 433                 goto free_mood_buf;
 434
 435         ret = create_argv(mood_buf, "\n", &moods);
 436         if (ret < 0)
 437                 goto free_pl_buf;
 438         num_moods = ret;
 439         ret = create_argv(pl_buf, "\n", &playlists);
 440         if (ret < 0)
 441                 goto free_moods;
 442         num_pl = ret;
 443         n = num_moods + num_pl;
 444         mops = para_malloc((n + 1) * sizeof(char *));
 445         for (i = 0; i < num_moods; i++)
 446                 mops[i] = make_message("m/%s", moods[i]);
 447         for (i = 0; i < num_pl; i++)
 448                 mops[num_moods + i] = make_message("p/%s", playlists[i]);
 449         mops[n] = NULL;
 450         i9e_extract_completions(ci->word, mops, &cr->matches);
 451         free_argv(mops);
 452         free_argv(playlists);
 453 free_moods:
 454         free_argv(moods);
 455 free_pl_buf:
 456         free(pl_buf);
 457 free_mood_buf:
 458         free(mood_buf);
 459 }
 460
 461 #define DEFINE_BLOB_COMPLETER(cmd, blob_type) \
 462         static void cmd ## blob_type ## _completer( \
 463                 struct i9e_completion_info *ci, \
 464                 struct i9e_completion_result *cr) \
 465         {complete_ ## cmd ## blob(#blob_type, ci, cr);}
 466
 467 DEFINE_BLOB_COMPLETER(add, mood)
 468 DEFINE_BLOB_COMPLETER(add, lyr)
 469 DEFINE_BLOB_COMPLETER(add, img)
 470 DEFINE_BLOB_COMPLETER(add, pl)
 471 DEFINE_BLOB_COMPLETER(cat, mood)
 472 DEFINE_BLOB_COMPLETER(cat, lyr)
 473 DEFINE_BLOB_COMPLETER(cat, img)
 474 DEFINE_BLOB_COMPLETER(cat, pl)
 475 DEFINE_BLOB_COMPLETER(ls, mood)
 476 DEFINE_BLOB_COMPLETER(ls, lyr)
 477 DEFINE_BLOB_COMPLETER(ls, img)
 478 DEFINE_BLOB_COMPLETER(ls, pl)
 479 DEFINE_BLOB_COMPLETER(rm, mood)
 480 DEFINE_BLOB_COMPLETER(rm, lyr)
 481 DEFINE_BLOB_COMPLETER(rm, img)
 482 DEFINE_BLOB_COMPLETER(rm, pl)
 483 DEFINE_BLOB_COMPLETER(mv, mood)
 484 DEFINE_BLOB_COMPLETER(mv, lyr)
 485 DEFINE_BLOB_COMPLETER(mv, img)
 486 DEFINE_BLOB_COMPLETER(mv, pl)
 487
 488 static int client_i9e_line_handler(char *line)
 489 {
 490         int ret;
 491         static bool first = true;
 492
 493         if (first)
 494                 first = false;
 495         else
 496                 lls_free_parse_result(ct->lpr, CLIENT_CMD_PTR);
 497         ret = create_merged_lpr(line);
 498         if (ret <= 0)
 499                 return ret;
 500         ret = client_connect(ct, &sched, NULL, NULL);
 501         if (ret < 0)
 502                 return ret;
 503         i9e_attach_to_stdout(ct->btrn[0]);
 504         return 1;
 505 }
 506
 507 static struct i9e_completer completers[] = {
 508 #define LSG_SERVER_CMD_CMD(_name) {.name = #_name, \
 509         .completer = _name ## _completer}
 510         LSG_SERVER_CMD_SUBCOMMANDS
 511 #undef LSG_SERVER_CMD_CMD
 512         {.name = NULL}
 513 };
 514
 515 __noreturn static void interactive_session(void)
 516 {
 517         int ret;
 518         struct sigaction act;
 519         struct i9e_client_info ici = {
 520                 .fds = {0, 1, 2},
 521                 .prompt = "para_client> ",
 522                 .line_handler = client_i9e_line_handler,
 523                 .loglevel = client_loglevel,
 524                 .completers = completers,
 525         };
 526
 527         PARA_NOTICE_LOG("\n%s\n", version_text("client"));
 528         if (CLIENT_OPT_GIVEN(HISTORY_FILE, ct->lpr))
 529                 ici.history_file = para_strdup(CLIENT_OPT_STRING_VAL(
 530                         HISTORY_FILE, ct->lpr));
 531         else {
 532                 char *home = para_homedir();
 533                 ici.history_file = make_message("%s/.paraslash/client.history",
 534                         home);
 535                 free(home);
 536         }
 537         act.sa_handler = i9e_signal_dispatch;
 538         sigemptyset(&act.sa_mask);
 539         act.sa_flags = 0;
 540         sigaction(SIGINT, &act, NULL);
 541         sched.poll_function = i9e_poll;
 542
 543         ret = i9e_open(&ici, &sched);
 544         if (ret < 0)
 545                 goto out;
 546         para_log = i9e_log;
 547         ret = schedule(&sched);
 548         sched_shutdown(&sched);
 549         i9e_close();
 550         para_log = stderr_log;
 551 out:
 552         if (ret < 0)
 553                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 554         exit(ret < 0? EXIT_FAILURE : EXIT_SUCCESS);
 555         //client_close(ct);
 556 }
 557
 558 __noreturn static void print_completions(void)
 559 {
 560         int ret;
 561
 562         ret = i9e_print_completions(completers);
 563         exit(ret <= 0? EXIT_FAILURE : EXIT_SUCCESS);
 564 }
 565
 566 #else /* HAVE_READLINE */
 567
 568 __noreturn static void interactive_session(void)
 569 {
 570         PARA_EMERG_LOG("interactive sessions not available\n");
 571         exit(EXIT_FAILURE);
 572 }
 573
 574 __noreturn static void print_completions(void)
 575 {
 576         PARA_EMERG_LOG("command completion not available\n");
 577         exit(EXIT_FAILURE);
 578 }
 579
 580 #endif /* HAVE_READLINE */
 581
 582 struct supervisor_task {
 583         bool stdout_task_started;
 584         struct task *task;
 585 };
 586
 587 static int supervisor_post_monitor(struct sched *s, void *context)
 588 {
 589         struct supervisor_task *svt = context;
 590         int ret = task_status(ct->task);
 591
 592         if (ret < 0)
 593                 return ret;
 594         if (!svt->stdout_task_started && ct->status == CL_EXECUTING) {
 595                 stdout_task_register(&sot, s);
 596                 svt->stdout_task_started = true;
 597                 return 1;
 598         }
 599         if (ct->status == CL_SENDING) {
 600                 stdin_task_register(&sit, s);
 601                 return -E_TASK_STARTED;
 602         }
 603         return 0;
 604 }
 605
 606 static struct supervisor_task supervisor_task;
 607
 608 /**
 609  * The client program to connect to para_server.
 610  *
 611  * \param argc Usual argument count.
 612  * \param argv Usual argument vector.
 613  *
 614  * When called without a paraslash command, an interactive session is started.
 615  * Otherwise, the client task and the supervisor task are started. The former
 616  * communicates with para_server while the latter monitors whether the client
 617  * task intends to read from stdin or write to stdout.
 618  *
 619  * Once it has been determined whether the client command corresponds to a
 620  * stdin command (addmood, addimg, ..), either the stdin task or the stdout
 621  * task is set up to replace the supervisor task.
 622  *
 623  * \return EXIT_SUCCESS or EXIT_FAILURE
 624  *
 625  * \sa \ref client_open(), \ref stdin.c, \ref stdout.c, para_client(1),
 626  * para_server(1).
 627  */
 628 int main(int argc, char *argv[])
 629 {
 630         int ret;
 631
 632         crypt_init();
 633         sched.default_timeout = 1000;
 634
 635         ret = client_parse_config(argc, argv, &ct, &client_loglevel);
 636         if (ret < 0)
 637                 goto out;
 638         if (CLIENT_OPT_GIVEN(COMPLETE, ct->lpr))
 639                 print_completions();
 640         if (ret == 0)
 641                 interactive_session(); /* does not return */
 642
 643         /*
 644          * We add buffer tree nodes for stdin and stdout even though
 645          * only one of them will be needed. This simplifies the code
 646          * a bit wrt. to the buffer tree setup.
 647          */
 648         sit.btrn = btr_new_node(&(struct btr_node_description)
 649                 EMBRACE(.name = "stdin"));
 650         ret = client_connect(ct, &sched, sit.btrn, NULL);
 651         if (ret < 0)
 652                 goto out;
 653         sot.btrn = btr_new_node(&(struct btr_node_description)
 654                 EMBRACE(.name = "stdout", .parent = ct->btrn[0]));
 655         supervisor_task.task = task_register(&(struct task_info) {
 656                 .name = "supervisor",
 657                 .post_monitor = supervisor_post_monitor,
 658                 .context = &supervisor_task,
 659         }, &sched);
 660
 661         ret = schedule(&sched);
 662         if (ret >= 0) {
 663                 ret = task_status(ct->task);
 664                 if (ret < 0) {
 665                         switch (ret) {
 666                         /* these are not errors */
 667                         case -E_SERVER_CMD_SUCCESS:
 668                         case -E_EOF:
 669                         case -E_SERVER_EOF:
 670                         case -E_BTR_EOF:
 671                                 ret = 0;
 672                                 break;
 673                         default: ret = -E_SERVER_CMD_FAILURE;
 674                         }
 675                 }
 676         }
 677         sched_shutdown(&sched);
 678         crypt_shutdown();
 679 out:
 680         if (ret < 0)
 681                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 682         client_close(ct);
 683         btr_remove_node(&sit.btrn);
 684         btr_remove_node(&sot.btrn);
 685         return ret < 0? EXIT_FAILURE : EXIT_SUCCESS;
 686 }