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_select(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_select(__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 orignal 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 = {.tv_sec = 1}};
 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_select = exec_pre_select,
 142                 .post_select = exec_post_select,
 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 I9E_DUMMY_COMPLETER(tasks);
 247
 248 static struct i9e_completer completers[];
 249
 250 static void help_completer(struct i9e_completion_info *ci,
 251                 struct i9e_completion_result *cr)
 252 {
 253         char *opts[] = {LSG_SERVER_CMD_HELP_OPTS, NULL};
 254
 255         if (ci->word[0] == '-') {
 256                 i9e_complete_option(opts, ci, cr);
 257                 return;
 258         }
 259         cr->matches = i9e_complete_commands(ci->word, completers);
 260 }
 261
 262 static void stat_completer(struct i9e_completion_info *ci,
 263                 struct i9e_completion_result *cr)
 264 {
 265         char *opts[] = {LSG_SERVER_CMD_STAT_OPTS, NULL};
 266         i9e_complete_option(opts, ci, cr);
 267 }
 268
 269 static void version_completer(struct i9e_completion_info *ci,
 270                 struct i9e_completion_result *cr)
 271 {
 272         char *opts[] = {LSG_SERVER_CMD_VERSION_OPTS, NULL};
 273         i9e_complete_option(opts, ci, cr);
 274 }
 275
 276 static void sender_completer(struct i9e_completion_info *ci,
 277                 struct i9e_completion_result *cr)
 278 {
 279         char *senders[] = {"http", "dccp", "udp", NULL};
 280         char *http_cmds[] = {"on", "off", "allow", "deny", "help", NULL};
 281         char *dccp_cmds[] = {"on", "off", "allow", "deny", "help", NULL};
 282         char *udp_cmds[] ={"on", "off", "add", "delete", "help", NULL};
 283         char *sender;
 284         char **cmds;
 285
 286         //PARA_CRIT_LOG("wn: %d\n", ci->word_num);
 287         if (ci->word_num == 0 || ci->word_num > 3)
 288                 return;
 289         if (ci->word_num == 1 || (ci->word_num == 2 && *ci->word != '\0')) {
 290                 i9e_extract_completions(ci->word, senders, &cr->matches);
 291                 return;
 292         }
 293         sender = ci->argv[1];
 294         //PARA_CRIT_LOG("sender: %s\n", sender);
 295         if (strcmp(sender, "http") == 0)
 296                 cmds = http_cmds;
 297         else if (strcmp(sender, "dccp") == 0)
 298                 cmds = dccp_cmds;
 299         else if (strcmp(sender, "udp") == 0)
 300                 cmds = udp_cmds;
 301         else
 302                 return;
 303         i9e_extract_completions(ci->word, cmds, &cr->matches);
 304 }
 305
 306 static void add_completer(struct i9e_completion_info *ci,
 307                 struct i9e_completion_result *cr)
 308 {
 309         char *opts[] = {LSG_SERVER_CMD_ADD_OPTS, NULL};
 310
 311         if (ci->word[0] == '-')
 312                 i9e_complete_option(opts, ci, cr);
 313         cr->filename_completion_desired = true;
 314 }
 315
 316 static void ls_completer(struct i9e_completion_info *ci,
 317                 struct i9e_completion_result *cr)
 318 {
 319         char *opts[] = {LSG_SERVER_CMD_LS_OPTS, NULL};
 320         if (ci->word[0] == '-')
 321                 i9e_complete_option(opts, ci, cr);
 322         cr->filename_completion_desired = true;
 323 }
 324
 325 static void setatt_completer(struct i9e_completion_info *ci,
 326                 struct i9e_completion_result *cr)
 327 {
 328         char *buf, **sl;
 329         int i, ret, num_atts;
 330
 331         if (ci->word_num == 0)
 332                 return;
 333
 334         if (*ci->word == '/' || *ci->word == '\0')
 335                 cr->filename_completion_desired = true;
 336         if (*ci->word == '/')
 337                 return;
 338         ret = execute_client_command("lsatt", &buf);
 339         if (ret < 0)
 340                 return;
 341         ret = create_argv(buf, "\n", &sl);
 342         if (ret < 0)
 343                 goto out;
 344         num_atts = ret;
 345         sl = para_realloc(sl, (2 * num_atts + 1) * sizeof(char *));
 346         for (i = 0; i < num_atts; i++) {
 347                 char *orig = sl[i];
 348                 sl[i] = make_message("%s+", orig);
 349                 sl[num_atts + i] = make_message("%s-", orig);
 350                 free(orig);
 351         }
 352         sl[2 * num_atts] = NULL;
 353         i9e_extract_completions(ci->word, sl, &cr->matches);
 354 out:
 355         free(buf);
 356         free_argv(sl);
 357 }
 358
 359 static void lsatt_completer(struct i9e_completion_info *ci,
 360                 struct i9e_completion_result *cr)
 361 {
 362         char *opts[] = {LSG_SERVER_CMD_LSATT_OPTS, NULL};
 363         i9e_complete_option(opts, ci, cr);
 364 }
 365
 366 static void mvatt_completer(struct i9e_completion_info *ci,
 367                 struct i9e_completion_result *cr)
 368 {
 369         complete_attributes(ci->word, &cr->matches);
 370 }
 371
 372 static void rmatt_completer(struct i9e_completion_info *ci,
 373                 struct i9e_completion_result *cr)
 374 {
 375         complete_attributes(ci->word, &cr->matches);
 376 }
 377
 378 static void check_completer(struct i9e_completion_info *ci,
 379                 struct i9e_completion_result *cr)
 380 {
 381         char *opts[] = {LSG_SERVER_CMD_CHECK_OPTS, NULL};
 382         i9e_complete_option(opts, ci, cr);
 383 }
 384
 385 static void rm_completer(struct i9e_completion_info *ci,
 386                 struct i9e_completion_result *cr)
 387 {
 388         char *opts[] = {LSG_SERVER_CMD_RM_OPTS, NULL};
 389
 390         if (ci->word[0] == '-') {
 391                 i9e_complete_option(opts, ci, cr);
 392                 return;
 393         }
 394         cr->filename_completion_desired = true;
 395 }
 396
 397 static void touch_completer(struct i9e_completion_info *ci,
 398                 struct i9e_completion_result *cr)
 399 {
 400         char *opts[] = {LSG_SERVER_CMD_TOUCH_OPTS, NULL};
 401
 402         if (ci->word[0] == '-')
 403                 i9e_complete_option(opts, ci, cr);
 404         cr->filename_completion_desired = true;
 405 }
 406
 407 static void cpsi_completer(struct i9e_completion_info *ci,
 408                 struct i9e_completion_result *cr)
 409 {
 410         char *opts[] = {LSG_SERVER_CMD_CPSI_OPTS, NULL};
 411
 412         if (ci->word[0] == '-')
 413                 i9e_complete_option(opts, ci, cr);
 414         cr->filename_completion_desired = true;
 415 }
 416
 417 static void select_completer(struct i9e_completion_info *ci,
 418                 struct i9e_completion_result *cr)
 419 {
 420         char *mood_buf, *pl_buf, **moods, **playlists, **mops;
 421         int num_moods, num_pl, i, n, ret;
 422
 423         ret = execute_client_command("lsmood", &mood_buf);
 424         if (ret < 0)
 425                 return;
 426         ret = execute_client_command("lspl", &pl_buf);
 427         if (ret < 0)
 428                 goto free_mood_buf;
 429
 430         ret = create_argv(mood_buf, "\n", &moods);
 431         if (ret < 0)
 432                 goto free_pl_buf;
 433         num_moods = ret;
 434         ret = create_argv(pl_buf, "\n", &playlists);
 435         if (ret < 0)
 436                 goto free_moods;
 437         num_pl = ret;
 438         n = num_moods + num_pl;
 439         mops = para_malloc((n + 1) * sizeof(char *));
 440         for (i = 0; i < num_moods; i++)
 441                 mops[i] = make_message("m/%s", moods[i]);
 442         for (i = 0; i < num_pl; i++)
 443                 mops[num_moods + i] = make_message("p/%s", playlists[i]);
 444         mops[n] = NULL;
 445         i9e_extract_completions(ci->word, mops, &cr->matches);
 446         free_argv(mops);
 447         free_argv(playlists);
 448 free_moods:
 449         free_argv(moods);
 450 free_pl_buf:
 451         free(pl_buf);
 452 free_mood_buf:
 453         free(mood_buf);
 454 }
 455
 456 #define DEFINE_BLOB_COMPLETER(cmd, blob_type) \
 457         static void cmd ## blob_type ## _completer( \
 458                 struct i9e_completion_info *ci, \
 459                 struct i9e_completion_result *cr) \
 460         {complete_ ## cmd ## blob(#blob_type, ci, cr);}
 461
 462 DEFINE_BLOB_COMPLETER(add, mood)
 463 DEFINE_BLOB_COMPLETER(add, lyr)
 464 DEFINE_BLOB_COMPLETER(add, img)
 465 DEFINE_BLOB_COMPLETER(add, pl)
 466 DEFINE_BLOB_COMPLETER(cat, mood)
 467 DEFINE_BLOB_COMPLETER(cat, lyr)
 468 DEFINE_BLOB_COMPLETER(cat, img)
 469 DEFINE_BLOB_COMPLETER(cat, pl)
 470 DEFINE_BLOB_COMPLETER(ls, mood)
 471 DEFINE_BLOB_COMPLETER(ls, lyr)
 472 DEFINE_BLOB_COMPLETER(ls, img)
 473 DEFINE_BLOB_COMPLETER(ls, pl)
 474 DEFINE_BLOB_COMPLETER(rm, mood)
 475 DEFINE_BLOB_COMPLETER(rm, lyr)
 476 DEFINE_BLOB_COMPLETER(rm, img)
 477 DEFINE_BLOB_COMPLETER(rm, pl)
 478 DEFINE_BLOB_COMPLETER(mv, mood)
 479 DEFINE_BLOB_COMPLETER(mv, lyr)
 480 DEFINE_BLOB_COMPLETER(mv, img)
 481 DEFINE_BLOB_COMPLETER(mv, pl)
 482
 483 static int client_i9e_line_handler(char *line)
 484 {
 485         int ret;
 486         static bool first = true;
 487
 488         if (first)
 489                 first = false;
 490         else
 491                 lls_free_parse_result(ct->lpr, CLIENT_CMD_PTR);
 492         ret = create_merged_lpr(line);
 493         if (ret <= 0)
 494                 return ret;
 495         ret = client_connect(ct, &sched, NULL, NULL);
 496         if (ret < 0)
 497                 return ret;
 498         i9e_attach_to_stdout(ct->btrn[0]);
 499         return 1;
 500 }
 501
 502 static struct i9e_completer completers[] = {
 503 #define LSG_SERVER_CMD_CMD(_name) {.name = #_name, \
 504         .completer = _name ## _completer}
 505         LSG_SERVER_CMD_SUBCOMMANDS
 506 #undef LSG_SERVER_CMD_CMD
 507         {.name = NULL}
 508 };
 509
 510 __noreturn static void interactive_session(void)
 511 {
 512         int ret;
 513         struct sigaction act;
 514         struct i9e_client_info ici = {
 515                 .fds = {0, 1, 2},
 516                 .prompt = "para_client> ",
 517                 .line_handler = client_i9e_line_handler,
 518                 .loglevel = client_loglevel,
 519                 .completers = completers,
 520         };
 521
 522         PARA_NOTICE_LOG("\n%s\n", version_text("client"));
 523         if (CLIENT_OPT_GIVEN(HISTORY_FILE, ct->lpr))
 524                 ici.history_file = para_strdup(CLIENT_OPT_STRING_VAL(
 525                         HISTORY_FILE, ct->lpr));
 526         else {
 527                 char *home = para_homedir();
 528                 ici.history_file = make_message("%s/.paraslash/client.history",
 529                         home);
 530                 free(home);
 531         }
 532         act.sa_handler = i9e_signal_dispatch;
 533         sigemptyset(&act.sa_mask);
 534         act.sa_flags = 0;
 535         sigaction(SIGINT, &act, NULL);
 536         sched.select_function = i9e_select;
 537
 538         ret = i9e_open(&ici, &sched);
 539         if (ret < 0)
 540                 goto out;
 541         para_log = i9e_log;
 542         ret = schedule(&sched);
 543         sched_shutdown(&sched);
 544         i9e_close();
 545         para_log = stderr_log;
 546 out:
 547         if (ret < 0)
 548                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 549         exit(ret < 0? EXIT_FAILURE : EXIT_SUCCESS);
 550         //client_close(ct);
 551 }
 552
 553 __noreturn static void print_completions(void)
 554 {
 555         int ret;
 556
 557         ret = i9e_print_completions(completers);
 558         exit(ret <= 0? EXIT_FAILURE : EXIT_SUCCESS);
 559 }
 560
 561 #else /* HAVE_READLINE */
 562
 563 __noreturn static void interactive_session(void)
 564 {
 565         PARA_EMERG_LOG("interactive sessions not available\n");
 566         exit(EXIT_FAILURE);
 567 }
 568
 569 __noreturn static void print_completions(void)
 570 {
 571         PARA_EMERG_LOG("command completion not available\n");
 572         exit(EXIT_FAILURE);
 573 }
 574
 575 #endif /* HAVE_READLINE */
 576
 577 struct supervisor_task {
 578         bool stdout_task_started;
 579         struct task *task;
 580 };
 581
 582 static int supervisor_post_select(struct sched *s, void *context)
 583 {
 584         struct supervisor_task *svt = context;
 585         int ret = task_status(ct->task);
 586
 587         if (ret < 0)
 588                 return ret;
 589         if (!svt->stdout_task_started && ct->status == CL_EXECUTING) {
 590                 stdout_task_register(&sot, s);
 591                 svt->stdout_task_started = true;
 592                 return 1;
 593         }
 594         if (ct->status == CL_SENDING) {
 595                 stdin_task_register(&sit, s);
 596                 return -E_TASK_STARTED;
 597         }
 598         return 0;
 599 }
 600
 601 static struct supervisor_task supervisor_task;
 602
 603 /**
 604  * The client program to connect to para_server.
 605  *
 606  * \param argc Usual argument count.
 607  * \param argv Usual argument vector.
 608  *
 609  * When called without a paraslash command, an interactive session is started.
 610  * Otherwise, the client task and the supervisor task are started. The former
 611  * communicates with para_server while the latter monitors whether the client
 612  * task intends to read from stdin or write to stdout.
 613  *
 614  * Once it has been determined whether the client command corresponds to a
 615  * stdin command (addmood, addimg, ..), either the stdin task or the stdout
 616  * task is set up to replace the supervisor task.
 617  *
 618  * \return EXIT_SUCCESS or EXIT_FAILURE
 619  *
 620  * \sa \ref client_open(), \ref stdin.c, \ref stdout.c, para_client(1),
 621  * para_server(1).
 622  */
 623 int main(int argc, char *argv[])
 624 {
 625         int ret;
 626
 627         init_random_seed_or_die();
 628         sched.default_timeout.tv_sec = 1;
 629
 630         ret = client_parse_config(argc, argv, &ct, &client_loglevel);
 631         if (ret < 0)
 632                 goto out;
 633         if (CLIENT_OPT_GIVEN(COMPLETE, ct->lpr))
 634                 print_completions();
 635         if (ret == 0)
 636                 interactive_session(); /* does not return */
 637
 638         /*
 639          * We add buffer tree nodes for stdin and stdout even though
 640          * only one of them will be needed. This simplifies the code
 641          * a bit wrt. to the buffer tree setup.
 642          */
 643         sit.btrn = btr_new_node(&(struct btr_node_description)
 644                 EMBRACE(.name = "stdin"));
 645         ret = client_connect(ct, &sched, sit.btrn, NULL);
 646         if (ret < 0)
 647                 goto out;
 648         sot.btrn = btr_new_node(&(struct btr_node_description)
 649                 EMBRACE(.name = "stdout", .parent = ct->btrn[0]));
 650         supervisor_task.task = task_register(&(struct task_info) {
 651                 .name = "supervisor",
 652                 .post_select = supervisor_post_select,
 653                 .context = &supervisor_task,
 654         }, &sched);
 655
 656         ret = schedule(&sched);
 657         if (ret >= 0) {
 658                 ret = task_status(ct->task);
 659                 if (ret < 0) {
 660                         switch (ret) {
 661                         /* these are not errors */
 662                         case -E_SERVER_CMD_SUCCESS:
 663                         case -E_EOF:
 664                         case -E_SERVER_EOF:
 665                         case -E_BTR_EOF:
 666                                 ret = 0;
 667                                 break;
 668                         default: ret = -E_SERVER_CMD_FAILURE;
 669                         }
 670                 }
 671         }
 672         sched_shutdown(&sched);
 673 out:
 674         if (ret < 0)
 675                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 676         client_close(ct);
 677         btr_remove_node(&sit.btrn);
 678         btr_remove_node(&sot.btrn);
 679         return ret < 0? EXIT_FAILURE : EXIT_SUCCESS;
 680 }