execute.c

   1 /*-*- Mode: C; c-basic-offset: 8 -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2010 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU General Public License as published by
  10   the Free Software Foundation; either version 2 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   General Public License for more details.
  17
  18   You should have received a copy of the GNU General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #pragma GCC diagnostic ignored "-Wattributes"
  23
  24 #include <assert.h>
  25 #include <dirent.h>
  26 #include <errno.h>
  27 #include <fcntl.h>
  28 #include <unistd.h>
  29 #include <string.h>
  30 #include <signal.h>
  31 #include <sys/socket.h>
  32 #include <sys/un.h>
  33 #include <sys/prctl.h>
  34 #include <linux/sched.h>
  35
  36 #include "execute.h"
  37 #include "strv.h"
  38 #include "macro.h"
  39 #include "util.h"
  40 #include "log.h"
  41 #include "ioprio.h"
  42 #include "securebits.h"
  43
  44 static int close_fds(int except[], unsigned n_except) {
  45         DIR *d;
  46         struct dirent *de;
  47         int r = 0;
  48
  49         /* Modifies the fds array! (sorts it) */
  50
  51         if (!(d = opendir("/proc/self/fd")))
  52                 return -errno;
  53
  54         while ((de = readdir(d))) {
  55                 int fd;
  56
  57                 if (de->d_name[0] == '.')
  58                         continue;
  59
  60                 if ((r = safe_atoi(de->d_name, &fd)) < 0)
  61                         goto finish;
  62
  63                 if (fd < 3)
  64                         continue;
  65
  66                 if (fd == dirfd(d))
  67                         continue;
  68
  69                 if (except) {
  70                         bool found;
  71                         unsigned i;
  72
  73                         found = false;
  74                         for (i = 0; i < n_except; i++)
  75                                 if (except[i] == fd) {
  76                                         found = true;
  77                                         break;
  78                                 }
  79
  80                         if (found)
  81                                 continue;
  82                 }
  83
  84                 if ((r = close_nointr(fd)) < 0)
  85                         goto finish;
  86         }
  87
  88 finish:
  89         closedir(d);
  90         return r;
  91 }
  92
  93 static int shift_fds(int fds[], unsigned n_fds) {
  94         int start, restart_from;
  95
  96         if (n_fds <= 0)
  97                 return 0;
  98
  99         assert(fds);
 100
 101         start = 0;
 102         for (;;) {
 103                 int i;
 104
 105                 restart_from = -1;
 106
 107                 for (i = start; i < (int) n_fds; i++) {
 108                         int nfd;
 109
 110                         /* Already at right index? */
 111                         if (fds[i] == i+3)
 112                                 continue;
 113
 114                         if ((nfd = fcntl(fds[i], F_DUPFD, i+3)) < 0)
 115                                 return -errno;
 116
 117                         assert_se(close_nointr(fds[i]) == 0);
 118                         fds[i] = nfd;
 119
 120                         /* Hmm, the fd we wanted isn't free? Then
 121                          * let's remember that and try again from here*/
 122                         if (nfd != i+3 && restart_from < 0)
 123                                 restart_from = i;
 124                 }
 125
 126                 if (restart_from < 0)
 127                         break;
 128
 129                 start = restart_from;
 130         }
 131
 132         return 0;
 133 }
 134
 135 static int flags_fds(int fds[], unsigned n_fds) {
 136         unsigned i;
 137
 138         if (n_fds <= 0)
 139                 return 0;
 140
 141         assert(fds);
 142
 143         /* Drops O_NONBLOCK and FD_CLOEXEC from the file flags */
 144
 145         for (i = 0; i < n_fds; i++) {
 146                 int flags;
 147
 148                 if ((flags = fcntl(fds[i], F_GETFL, 0)) < 0)
 149                         return -errno;
 150
 151                 /* Since we are at it, let's make sure that nobody
 152                  * forgot setting O_NONBLOCK for all our fds */
 153
 154                 if (fcntl(fds[i], F_SETFL, flags &~O_NONBLOCK) < 0)
 155                         return -errno;
 156
 157                 if ((flags = fcntl(fds[i], F_GETFD, 0)) < 0)
 158                         return -errno;
 159
 160                 /* Also make sure nobody forgot O_CLOEXEC for all our
 161                  * fds */
 162                 if (fcntl(fds[i], F_SETFD, flags &~FD_CLOEXEC) < 0)
 163                         return -errno;
 164         }
 165
 166         return 0;
 167 }
 168
 169 static int replace_null_fd(int fd, int flags) {
 170         int nfd;
 171         assert(fd >= 0);
 172
 173         close_nointr(fd);
 174
 175         if ((nfd = open("/dev/null", flags|O_NOCTTY)) < 0)
 176                 return -errno;
 177
 178         if (nfd != fd) {
 179                 close_nointr_nofail(nfd);
 180                 return -EIO;
 181         }
 182
 183         return 0;
 184 }
 185
 186 static int setup_output(const ExecContext *context, const char *ident) {
 187         int r;
 188
 189         assert(context);
 190
 191         switch (context->output) {
 192
 193         case EXEC_OUTPUT_CONSOLE:
 194                 return 0;
 195
 196         case EXEC_OUTPUT_NULL:
 197
 198                 if ((r = replace_null_fd(STDOUT_FILENO, O_WRONLY)) < 0 ||
 199                     (r = replace_null_fd(STDERR_FILENO, O_WRONLY)) < 0)
 200                         return r;
 201
 202                 return 0;
 203
 204         case EXEC_OUTPUT_KERNEL:
 205         case EXEC_OUTPUT_SYSLOG: {
 206
 207                 int fd;
 208                 union {
 209                         struct sockaddr sa;
 210                         struct sockaddr_un un;
 211                 } sa;
 212
 213                 close_nointr(STDOUT_FILENO);
 214                 close_nointr(STDERR_FILENO);
 215
 216                 if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) < 0)
 217                         return -errno;
 218
 219                 if (fd != STDOUT_FILENO) {
 220                         close_nointr_nofail(fd);
 221                         return -EIO;
 222                 }
 223
 224                 zero(sa);
 225                 sa.sa.sa_family = AF_UNIX;
 226                 strncpy(sa.un.sun_path+1, LOGGER_SOCKET, sizeof(sa.un.sun_path)-1);
 227
 228                 if (connect(fd, &sa.sa, sizeof(sa)) < 0) {
 229                         close_nointr_nofail(fd);
 230                         return -errno;
 231                 }
 232
 233                 if (shutdown(fd, SHUT_RD) < 0) {
 234                         close_nointr_nofail(fd);
 235                         return -errno;
 236                 }
 237
 238                 if ((fd = dup(fd)) < 0) {
 239                         close_nointr_nofail(fd);
 240                         return -errno;
 241                 }
 242
 243                 if (fd != STDERR_FILENO) {
 244                         close_nointr_nofail(fd);
 245                         return -EIO;
 246                 }
 247
 248                 /* We speak a very simple protocol between log server
 249                  * and client: one line for the log destination (kmsg
 250                  * or syslog), followed by the priority field,
 251                  * followed by the process name. Since we replaced
 252                  * stdin/stderr we simple use stdio to write to
 253                  * it. Note that we use stderr, to minimize buffer
 254                  * flushing issues. */
 255
 256                 fprintf(stderr,
 257                         "%s\n"
 258                         "%i\n"
 259                         "%s\n",
 260                         context->output == EXEC_OUTPUT_KERNEL ? "kmsg" : "syslog",
 261                         context->syslog_priority,
 262                         context->syslog_identifier ? context->syslog_identifier : ident);
 263
 264                 return 0;
 265         }
 266
 267         default:
 268                 assert_not_reached("Unknown output type");
 269         }
 270 }
 271
 272 static int setup_input(const ExecContext *context) {
 273         int r;
 274
 275         assert(context);
 276
 277         switch (context->input) {
 278
 279         case EXEC_INPUT_CONSOLE:
 280                 return 0;
 281
 282         case EXEC_INPUT_NULL:
 283                 if ((r = replace_null_fd(STDIN_FILENO, O_RDONLY)) < 0)
 284                         return r;
 285
 286                 return 0;
 287
 288         default:
 289                 assert_not_reached("Unknown input type");
 290         }
 291 }
 292
 293 int exec_spawn(const ExecCommand *command, const ExecContext *context, int *fds, unsigned n_fds, pid_t *ret) {
 294         pid_t pid;
 295
 296         assert(command);
 297         assert(context);
 298         assert(ret);
 299         assert(fds || n_fds <= 0);
 300
 301         log_debug("about to execute %s", command->path);
 302
 303         if ((pid = fork()) < 0)
 304                 return -errno;
 305
 306         if (pid == 0) {
 307                 char **e, **f = NULL;
 308                 int i, r;
 309                 sigset_t ss;
 310
 311                 /* child */
 312
 313                 if (sigemptyset(&ss) < 0 ||
 314                     sigprocmask(SIG_SETMASK, &ss, NULL) < 0) {
 315                         r = EXIT_SIGNAL_MASK;
 316                         goto fail;
 317                 }
 318
 319                 if (setpgid(0, 0) < 0) {
 320                         r = EXIT_PGID;
 321                         goto fail;
 322                 }
 323
 324                 umask(context->umask);
 325
 326                 if (setup_input(context) < 0) {
 327                         r = EXIT_INPUT;
 328                         goto fail;
 329                 }
 330
 331                 if (setup_output(context, file_name_from_path(command->path)) < 0) {
 332                         r = EXIT_OUTPUT;
 333                         goto fail;
 334                 }
 335
 336                 if (context->oom_adjust_set) {
 337                         char t[16];
 338
 339                         snprintf(t, sizeof(t), "%i", context->oom_adjust);
 340                         char_array_0(t);
 341
 342                         if (write_one_line_file("/proc/self/oom_adj", t) < 0) {
 343                                 r = EXIT_OOM_ADJUST;
 344                                 goto fail;
 345                         }
 346                 }
 347
 348                 if (context->root_directory)
 349                         if (chroot(context->root_directory) < 0) {
 350                                 r = EXIT_CHROOT;
 351                                 goto fail;
 352                         }
 353
 354                 if (chdir(context->working_directory ? context->working_directory : "/") < 0) {
 355                         r = EXIT_CHDIR;
 356                         goto fail;
 357                 }
 358
 359                 if (context->nice_set)
 360                         if (setpriority(PRIO_PROCESS, 0, context->nice) < 0) {
 361                                 r = EXIT_NICE;
 362                                 goto fail;
 363                         }
 364
 365                 if (context->cpu_sched_set) {
 366                         struct sched_param param;
 367
 368                         zero(param);
 369                         param.sched_priority = context->cpu_sched_priority;
 370
 371                         if (sched_setscheduler(0, context->cpu_sched_policy |
 372                                                (context->cpu_sched_reset_on_fork ? SCHED_RESET_ON_FORK : 0), &param) < 0) {
 373                                 r = EXIT_SETSCHEDULER;
 374                                 goto fail;
 375                         }
 376                 }
 377
 378                 if (context->cpu_affinity_set)
 379                         if (sched_setaffinity(0, sizeof(context->cpu_affinity), &context->cpu_affinity) < 0) {
 380                                 r = EXIT_CPUAFFINITY;
 381                                 goto fail;
 382                         }
 383
 384                 if (context->ioprio_set)
 385                         if (ioprio_set(IOPRIO_WHO_PROCESS, 0, context->ioprio) < 0) {
 386                                 r = EXIT_IOPRIO;
 387                                 goto fail;
 388                         }
 389
 390                 if (context->timer_slack_ns_set)
 391                         if (prctl(PR_SET_TIMERSLACK, context->timer_slack_ns_set) < 0) {
 392                                 r = EXIT_TIMERSLACK;
 393                                 goto fail;
 394                         }
 395
 396                 if (close_fds(fds, n_fds) < 0 ||
 397                     shift_fds(fds, n_fds) < 0 ||
 398                     flags_fds(fds, n_fds) < 0) {
 399                         r = EXIT_FDS;
 400                         goto fail;
 401                 }
 402
 403                 for (i = 0; i < RLIMIT_NLIMITS; i++) {
 404                         if (!context->rlimit[i])
 405                                 continue;
 406
 407                         if (setrlimit(i, context->rlimit[i]) < 0) {
 408                                 r = EXIT_LIMITS;
 409                                 goto fail;
 410                         }
 411                 }
 412
 413                 if (context->secure_bits) {
 414                         if (prctl(PR_SET_SECUREBITS, context->secure_bits) < 0) {
 415                                 r = EXIT_SECUREBITS;
 416                                 goto fail;
 417                         }
 418                 }
 419
 420                 if (n_fds > 0) {
 421                         char a[64], b[64];
 422                         char *listen_env[3] = {
 423                                 a,
 424                                 b,
 425                                 NULL
 426                         };
 427
 428                         snprintf(a, sizeof(a), "LISTEN_PID=%llu", (unsigned long long) getpid());
 429                         snprintf(b, sizeof(b), "LISTEN_FDS=%u", n_fds);
 430
 431                         a[sizeof(a)-1] = 0;
 432                         b[sizeof(b)-1] = 0;
 433
 434                         if (context->environment) {
 435                                 if (!(f = strv_merge(listen_env, context->environment))) {
 436                                         r = EXIT_MEMORY;
 437                                         goto fail;
 438                                 }
 439                                 e = f;
 440                         } else
 441                                 e = listen_env;
 442
 443                 } else
 444                         e = context->environment;
 445
 446                 execve(command->path, command->argv, e);
 447                 r = EXIT_EXEC;
 448
 449         fail:
 450                 strv_free(f);
 451                 _exit(r);
 452         }
 453
 454
 455         log_debug("executed %s as %llu", command->path, (unsigned long long) pid);
 456
 457         *ret = pid;
 458         return 0;
 459 }
 460
 461 void exec_context_init(ExecContext *c) {
 462         assert(c);
 463
 464         c->umask = 0002;
 465         c->oom_adjust = 0;
 466         c->oom_adjust_set = false;
 467         c->nice = 0;
 468         c->nice_set = false;
 469         c->ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 0);
 470         c->ioprio_set = false;
 471         c->cpu_sched_policy = SCHED_OTHER;
 472         c->cpu_sched_priority = 0;
 473         c->cpu_sched_set = false;
 474         CPU_ZERO(&c->cpu_affinity);
 475         c->cpu_affinity_set = false;
 476
 477         c->input = 0;
 478         c->output = 0;
 479         c->syslog_priority = LOG_DAEMON|LOG_INFO;
 480
 481         c->secure_bits = 0;
 482         c->capability_bounding_set_drop = 0;
 483 }
 484
 485 void exec_context_done(ExecContext *c) {
 486         unsigned l;
 487
 488         assert(c);
 489
 490         strv_free(c->environment);
 491         c->environment = NULL;
 492
 493         for (l = 0; l < ELEMENTSOF(c->rlimit); l++) {
 494                 free(c->rlimit[l]);
 495                 c->rlimit[l] = NULL;
 496         }
 497
 498         free(c->working_directory);
 499         c->working_directory = NULL;
 500         free(c->root_directory);
 501         c->root_directory = NULL;
 502
 503         free(c->syslog_identifier);
 504         c->syslog_identifier = NULL;
 505
 506         free(c->user);
 507         c->user = NULL;
 508
 509         free(c->group);
 510         c->group = NULL;
 511
 512         strv_free(c->supplementary_groups);
 513         c->supplementary_groups = NULL;
 514
 515         if (c->capabilities) {
 516                 cap_free(c->capabilities);
 517                 c->capabilities = NULL;
 518         }
 519 }
 520
 521 void exec_command_free_list(ExecCommand *c) {
 522         ExecCommand *i;
 523
 524         while ((i = c)) {
 525                 LIST_REMOVE(ExecCommand, command, c, i);
 526
 527                 free(i->path);
 528                 strv_free(i->argv);
 529                 free(i);
 530         }
 531 }
 532
 533 void exec_command_free_array(ExecCommand **c, unsigned n) {
 534         unsigned i;
 535
 536         for (i = 0; i < n; i++) {
 537                 exec_command_free_list(c[i]);
 538                 c[i] = NULL;
 539         }
 540 }
 541
 542 void exec_context_dump(ExecContext *c, FILE* f, const char *prefix) {
 543         char ** e;
 544         unsigned i;
 545
 546         assert(c);
 547         assert(f);
 548
 549         if (!prefix)
 550                 prefix = "";
 551
 552         fprintf(f,
 553                 "%sUMask: %04o\n"
 554                 "%sWorkingDirectory: %s\n"
 555                 "%sRootDirectory: %s\n",
 556                 prefix, c->umask,
 557                 prefix, c->working_directory ? c->working_directory : "/",
 558                 prefix, c->root_directory ? c->root_directory : "/");
 559
 560         if (c->environment)
 561                 for (e = c->environment; *e; e++)
 562                         fprintf(f, "%sEnvironment: %s\n", prefix, *e);
 563
 564         if (c->nice_set)
 565                 fprintf(f,
 566                         "%sNice: %i\n",
 567                         prefix, c->nice);
 568
 569         if (c->oom_adjust_set)
 570                 fprintf(f,
 571                         "%sOOMAdjust: %i\n",
 572                         prefix, c->oom_adjust);
 573
 574         for (i = 0; i < RLIM_NLIMITS; i++)
 575                 if (c->rlimit[i])
 576                         fprintf(f, "%s%s: %llu\n", prefix, rlimit_to_string(i), (unsigned long long) c->rlimit[i]->rlim_max);
 577
 578         if (c->ioprio_set)
 579                 fprintf(f,
 580                         "%sIOSchedulingClass: %s\n"
 581                         "%sIOPriority: %i\n",
 582                         prefix, ioprio_class_to_string(IOPRIO_PRIO_CLASS(c->ioprio)),
 583                         prefix, (int) IOPRIO_PRIO_DATA(c->ioprio));
 584
 585         if (c->cpu_sched_set)
 586                 fprintf(f,
 587                         "%sCPUSchedulingPolicy: %s\n"
 588                         "%sCPUSchedulingPriority: %i\n"
 589                         "%sCPUSchedulingResetOnFork: %s\n",
 590                         prefix, sched_policy_to_string(c->cpu_sched_policy),
 591                         prefix, c->cpu_sched_priority,
 592                         prefix, yes_no(c->cpu_sched_reset_on_fork));
 593
 594         if (c->cpu_affinity_set) {
 595                 fprintf(f, "%sCPUAffinity:", prefix);
 596                 for (i = 0; i < CPU_SETSIZE; i++)
 597                         if (CPU_ISSET(i, &c->cpu_affinity))
 598                                 fprintf(f, " %i", i);
 599                 fputs("\n", f);
 600         }
 601
 602         if (c->timer_slack_ns_set)
 603                 fprintf(f, "%sTimerSlackNS: %lu\n", prefix, c->timer_slack_ns);
 604
 605         fprintf(f,
 606                 "%sInput: %s\n"
 607                 "%sOutput: %s\n",
 608                 prefix, exec_input_to_string(c->input),
 609                 prefix, exec_output_to_string(c->output));
 610
 611         if (c->output == EXEC_OUTPUT_SYSLOG || c->output == EXEC_OUTPUT_KERNEL)
 612                 fprintf(f,
 613                         "%sSyslogFacility: %s\n"
 614                         "%sSyslogLevel: %s\n",
 615                         prefix, log_facility_to_string(LOG_FAC(c->syslog_priority)),
 616                         prefix, log_level_to_string(LOG_PRI(c->syslog_priority)));
 617
 618         if (c->capabilities) {
 619                 char *t;
 620                 if ((t = cap_to_text(c->capabilities, NULL))) {
 621                         fprintf(f, "%sCapabilities: %s\n",
 622                                 prefix, t);
 623                         cap_free(t);
 624                 }
 625         }
 626
 627         if (c->secure_bits)
 628                 fprintf(f, "%sSecure Bits:%s%s%s%s%s%s\n",
 629                         prefix,
 630                         (c->secure_bits & SECURE_KEEP_CAPS) ? " keep-caps" : "",
 631                         (c->secure_bits & SECURE_KEEP_CAPS_LOCKED) ? " keep-caps-locked" : "",
 632                         (c->secure_bits & SECURE_NO_SETUID_FIXUP) ? " no-setuid-fixup" : "",
 633                         (c->secure_bits & SECURE_NO_SETUID_FIXUP_LOCKED) ? " no-setuid-fixup-locked" : "",
 634                         (c->secure_bits & SECURE_NOROOT) ? " noroot" : "",
 635                         (c->secure_bits & SECURE_NOROOT_LOCKED) ? "noroot-locked" : "");
 636
 637         if (c->capability_bounding_set_drop) {
 638                 fprintf(f, "%sCapabilityBoundingSetDrop:", prefix);
 639
 640                 for (i = 0; i <= CAP_LAST_CAP; i++)
 641                         if (c->capability_bounding_set_drop & (1 << i)) {
 642                                 char *t;
 643
 644                                 if ((t = cap_to_name(i))) {
 645                                         fprintf(f, " %s", t);
 646                                         free(t);
 647                                 }
 648                         }
 649
 650                 fputs("\n", f);
 651         }
 652
 653         if (c->user)
 654                 fprintf(f, "%sUser: %s", prefix, c->user);
 655         if (c->group)
 656                 fprintf(f, "%sGroup: %s", prefix, c->group);
 657
 658         if (c->supplementary_groups) {
 659                 char **g;
 660
 661                 fprintf(f, "%sSupplementaryGroups:", prefix);
 662
 663                 STRV_FOREACH(g, c->supplementary_groups)
 664                         fprintf(f, " %s", *g);
 665
 666                 fputs("\n", f);
 667         }
 668 }
 669
 670 void exec_status_fill(ExecStatus *s, pid_t pid, int code, int status) {
 671         assert(s);
 672
 673         s->pid = pid;
 674         s->code = code;
 675         s->status = status;
 676         s->timestamp = now(CLOCK_REALTIME);
 677 }
 678
 679 char *exec_command_line(ExecCommand *c) {
 680         size_t k;
 681         char *n, *p, **a;
 682         bool first = true;
 683
 684         assert(c);
 685         assert(c->argv);
 686
 687         k = 1;
 688         STRV_FOREACH(a, c->argv)
 689                 k += strlen(*a)+3;
 690
 691         if (!(n = new(char, k)))
 692                 return NULL;
 693
 694         p = n;
 695         STRV_FOREACH(a, c->argv) {
 696
 697                 if (!first)
 698                         *(p++) = ' ';
 699                 else
 700                         first = false;
 701
 702                 if (strpbrk(*a, WHITESPACE)) {
 703                         *(p++) = '\'';
 704                         p = stpcpy(p, *a);
 705                         *(p++) = '\'';
 706                 } else
 707                         p = stpcpy(p, *a);
 708
 709         }
 710
 711         *p = 0;
 712
 713         /* FIXME: this doesn't really handle arguments that have
 714          * spaces and ticks in them */
 715
 716         return n;
 717 }
 718
 719 void exec_command_dump(ExecCommand *c, FILE *f, const char *prefix) {
 720         char *cmd;
 721
 722         assert(c);
 723         assert(f);
 724
 725         if (!prefix)
 726                 prefix = "";
 727
 728         cmd = exec_command_line(c);
 729
 730         fprintf(f,
 731                 "%sCommand Line: %s\n",
 732                 prefix, cmd ? cmd : strerror(ENOMEM));
 733
 734         free(cmd);
 735 }
 736
 737 void exec_command_dump_list(ExecCommand *c, FILE *f, const char *prefix) {
 738         assert(f);
 739
 740         if (!prefix)
 741                 prefix = "";
 742
 743         LIST_FOREACH(command, c, c)
 744                 exec_command_dump(c, f, prefix);
 745 }
 746
 747 static const char* const exec_output_table[_EXEC_OUTPUT_MAX] = {
 748         [EXEC_OUTPUT_CONSOLE] = "console",
 749         [EXEC_OUTPUT_NULL] = "null",
 750         [EXEC_OUTPUT_SYSLOG] = "syslog",
 751         [EXEC_OUTPUT_KERNEL] = "kernel"
 752 };
 753
 754 DEFINE_STRING_TABLE_LOOKUP(exec_output, ExecOutput);
 755
 756 static const char* const exec_input_table[_EXEC_INPUT_MAX] = {
 757         [EXEC_INPUT_NULL] = "null",
 758         [EXEC_INPUT_CONSOLE] = "console"
 759 };
 760
 761 DEFINE_STRING_TABLE_LOOKUP(exec_input, ExecInput);