src/basic/process-util.c

   1 /***
   2   This file is part of systemd.
   3
   4   Copyright 2010 Lennart Poettering
   5
   6   systemd is free software; you can redistribute it and/or modify it
   7   under the terms of the GNU Lesser General Public License as published by
   8   the Free Software Foundation; either version 2.1 of the License, or
   9   (at your option) any later version.
  10
  11   systemd is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   Lesser General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  18 ***/
  19
  20 #include <ctype.h>
  21 #include <errno.h>
  22 #include <limits.h>
  23 #include <linux/oom.h>
  24 #include <sched.h>
  25 #include <signal.h>
  26 #include <stdbool.h>
  27 #include <stdio.h>
  28 #include <stdlib.h>
  29 #include <string.h>
  30 #include <sys/personality.h>
  31 #include <sys/prctl.h>
  32 #include <sys/types.h>
  33 #include <sys/wait.h>
  34 #include <syslog.h>
  35 #include <unistd.h>
  36 #ifdef HAVE_VALGRIND_VALGRIND_H
  37 #include <valgrind/valgrind.h>
  38 #endif
  39
  40 #include "alloc-util.h"
  41 #include "architecture.h"
  42 #include "escape.h"
  43 #include "fd-util.h"
  44 #include "fileio.h"
  45 #include "fs-util.h"
  46 #include "ioprio.h"
  47 #include "log.h"
  48 #include "macro.h"
  49 #include "missing.h"
  50 #include "process-util.h"
  51 #include "raw-clone.h"
  52 #include "signal-util.h"
  53 #include "stat-util.h"
  54 #include "string-table.h"
  55 #include "string-util.h"
  56 #include "user-util.h"
  57 #include "util.h"
  58
  59 int get_process_state(pid_t pid) {
  60         const char *p;
  61         char state;
  62         int r;
  63         _cleanup_free_ char *line = NULL;
  64
  65         assert(pid >= 0);
  66
  67         p = procfs_file_alloca(pid, "stat");
  68
  69         r = read_one_line_file(p, &line);
  70         if (r == -ENOENT)
  71                 return -ESRCH;
  72         if (r < 0)
  73                 return r;
  74
  75         p = strrchr(line, ')');
  76         if (!p)
  77                 return -EIO;
  78
  79         p++;
  80
  81         if (sscanf(p, " %c", &state) != 1)
  82                 return -EIO;
  83
  84         return (unsigned char) state;
  85 }
  86
  87 int get_process_comm(pid_t pid, char **name) {
  88         const char *p;
  89         int r;
  90
  91         assert(name);
  92         assert(pid >= 0);
  93
  94         p = procfs_file_alloca(pid, "comm");
  95
  96         r = read_one_line_file(p, name);
  97         if (r == -ENOENT)
  98                 return -ESRCH;
  99
 100         return r;
 101 }
 102
 103 int get_process_cmdline(pid_t pid, size_t max_length, bool comm_fallback, char **line) {
 104         _cleanup_fclose_ FILE *f = NULL;
 105         bool space = false;
 106         char *r = NULL, *k;
 107         const char *p;
 108         int c;
 109
 110         assert(line);
 111         assert(pid >= 0);
 112
 113         /* Retrieves a process' command line. Replaces unprintable characters while doing so by whitespace (coalescing
 114          * multiple sequential ones into one). If max_length is != 0 will return a string of the specified size at most
 115          * (the trailing NUL byte does count towards the length here!), abbreviated with a "..." ellipsis. If
 116          * comm_fallback is true and the process has no command line set (the case for kernel threads), or has a
 117          * command line that resolves to the empty string will return the "comm" name of the process instead.
 118          *
 119          * Returns -ESRCH if the process doesn't exist, and -ENOENT if the process has no command line (and
 120          * comm_fallback is false). */
 121
 122         p = procfs_file_alloca(pid, "cmdline");
 123
 124         f = fopen(p, "re");
 125         if (!f) {
 126                 if (errno == ENOENT)
 127                         return -ESRCH;
 128                 return -errno;
 129         }
 130
 131         if (max_length == 1) {
 132
 133                 /* If there's only room for one byte, return the empty string */
 134                 r = new0(char, 1);
 135                 if (!r)
 136                         return -ENOMEM;
 137
 138                 *line = r;
 139                 return 0;
 140
 141         } else if (max_length == 0) {
 142                 size_t len = 0, allocated = 0;
 143
 144                 while ((c = getc(f)) != EOF) {
 145
 146                         if (!GREEDY_REALLOC(r, allocated, len+3)) {
 147                                 free(r);
 148                                 return -ENOMEM;
 149                         }
 150
 151                         if (isprint(c)) {
 152                                 if (space) {
 153                                         r[len++] = ' ';
 154                                         space = false;
 155                                 }
 156
 157                                 r[len++] = c;
 158                         } else if (len > 0)
 159                                 space = true;
 160                }
 161
 162                 if (len > 0)
 163                         r[len] = 0;
 164                 else
 165                         r = mfree(r);
 166
 167         } else {
 168                 bool dotdotdot = false;
 169                 size_t left;
 170
 171                 r = new(char, max_length);
 172                 if (!r)
 173                         return -ENOMEM;
 174
 175                 k = r;
 176                 left = max_length;
 177                 while ((c = getc(f)) != EOF) {
 178
 179                         if (isprint(c)) {
 180
 181                                 if (space) {
 182                                         if (left <= 2) {
 183                                                 dotdotdot = true;
 184                                                 break;
 185                                         }
 186
 187                                         *(k++) = ' ';
 188                                         left--;
 189                                         space = false;
 190                                 }
 191
 192                                 if (left <= 1) {
 193                                         dotdotdot = true;
 194                                         break;
 195                                 }
 196
 197                                 *(k++) = (char) c;
 198                                 left--;
 199                         } else if (k > r)
 200                                 space = true;
 201                 }
 202
 203                 if (dotdotdot) {
 204                         if (max_length <= 4) {
 205                                 k = r;
 206                                 left = max_length;
 207                         } else {
 208                                 k = r + max_length - 4;
 209                                 left = 4;
 210
 211                                 /* Eat up final spaces */
 212                                 while (k > r && isspace(k[-1])) {
 213                                         k--;
 214                                         left++;
 215                                 }
 216                         }
 217
 218                         strncpy(k, "...", left-1);
 219                         k[left-1] = 0;
 220                 } else
 221                         *k = 0;
 222         }
 223
 224         /* Kernel threads have no argv[] */
 225         if (isempty(r)) {
 226                 _cleanup_free_ char *t = NULL;
 227                 int h;
 228
 229                 free(r);
 230
 231                 if (!comm_fallback)
 232                         return -ENOENT;
 233
 234                 h = get_process_comm(pid, &t);
 235                 if (h < 0)
 236                         return h;
 237
 238                 if (max_length == 0)
 239                         r = strjoin("[", t, "]", NULL);
 240                 else {
 241                         size_t l;
 242
 243                         l = strlen(t);
 244
 245                         if (l + 3 <= max_length)
 246                                 r = strjoin("[", t, "]", NULL);
 247                         else if (max_length <= 6) {
 248
 249                                 r = new(char, max_length);
 250                                 if (!r)
 251                                         return -ENOMEM;
 252
 253                                 memcpy(r, "[...]", max_length-1);
 254                                 r[max_length-1] = 0;
 255                         } else {
 256                                 char *e;
 257
 258                                 t[max_length - 6] = 0;
 259
 260                                 /* Chop off final spaces */
 261                                 e = strchr(t, 0);
 262                                 while (e > t && isspace(e[-1]))
 263                                         e--;
 264                                 *e = 0;
 265
 266                                 r = strjoin("[", t, "...]", NULL);
 267                         }
 268                 }
 269                 if (!r)
 270                         return -ENOMEM;
 271         }
 272
 273         *line = r;
 274         return 0;
 275 }
 276
 277 void rename_process(const char name[8]) {
 278         assert(name);
 279
 280         /* This is a like a poor man's setproctitle(). It changes the
 281          * comm field, argv[0], and also the glibc's internally used
 282          * name of the process. For the first one a limit of 16 chars
 283          * applies, to the second one usually one of 10 (i.e. length
 284          * of "/sbin/init"), to the third one one of 7 (i.e. length of
 285          * "systemd"). If you pass a longer string it will be
 286          * truncated */
 287
 288         (void) prctl(PR_SET_NAME, name);
 289
 290         if (program_invocation_name)
 291                 strncpy(program_invocation_name, name, strlen(program_invocation_name));
 292
 293         if (saved_argc > 0) {
 294                 int i;
 295
 296                 if (saved_argv[0])
 297                         strncpy(saved_argv[0], name, strlen(saved_argv[0]));
 298
 299                 for (i = 1; i < saved_argc; i++) {
 300                         if (!saved_argv[i])
 301                                 break;
 302
 303                         memzero(saved_argv[i], strlen(saved_argv[i]));
 304                 }
 305         }
 306 }
 307
 308 int is_kernel_thread(pid_t pid) {
 309         const char *p;
 310         size_t count;
 311         char c;
 312         bool eof;
 313         FILE *f;
 314
 315         if (pid == 0 || pid == 1) /* pid 1, and we ourselves certainly aren't a kernel thread */
 316                 return 0;
 317
 318         assert(pid > 1);
 319
 320         p = procfs_file_alloca(pid, "cmdline");
 321         f = fopen(p, "re");
 322         if (!f) {
 323                 if (errno == ENOENT)
 324                         return -ESRCH;
 325                 return -errno;
 326         }
 327
 328         count = fread(&c, 1, 1, f);
 329         eof = feof(f);
 330         fclose(f);
 331
 332         /* Kernel threads have an empty cmdline */
 333
 334         if (count <= 0)
 335                 return eof ? 1 : -errno;
 336
 337         return 0;
 338 }
 339
 340 int get_process_capeff(pid_t pid, char **capeff) {
 341         const char *p;
 342         int r;
 343
 344         assert(capeff);
 345         assert(pid >= 0);
 346
 347         p = procfs_file_alloca(pid, "status");
 348
 349         r = get_proc_field(p, "CapEff", WHITESPACE, capeff);
 350         if (r == -ENOENT)
 351                 return -ESRCH;
 352
 353         return r;
 354 }
 355
 356 static int get_process_link_contents(const char *proc_file, char **name) {
 357         int r;
 358
 359         assert(proc_file);
 360         assert(name);
 361
 362         r = readlink_malloc(proc_file, name);
 363         if (r == -ENOENT)
 364                 return -ESRCH;
 365         if (r < 0)
 366                 return r;
 367
 368         return 0;
 369 }
 370
 371 int get_process_exe(pid_t pid, char **name) {
 372         const char *p;
 373         char *d;
 374         int r;
 375
 376         assert(pid >= 0);
 377
 378         p = procfs_file_alloca(pid, "exe");
 379         r = get_process_link_contents(p, name);
 380         if (r < 0)
 381                 return r;
 382
 383         d = endswith(*name, " (deleted)");
 384         if (d)
 385                 *d = '\0';
 386
 387         return 0;
 388 }
 389
 390 static int get_process_id(pid_t pid, const char *field, uid_t *uid) {
 391         _cleanup_fclose_ FILE *f = NULL;
 392         char line[LINE_MAX];
 393         const char *p;
 394
 395         assert(field);
 396         assert(uid);
 397
 398         p = procfs_file_alloca(pid, "status");
 399         f = fopen(p, "re");
 400         if (!f) {
 401                 if (errno == ENOENT)
 402                         return -ESRCH;
 403                 return -errno;
 404         }
 405
 406         FOREACH_LINE(line, f, return -errno) {
 407                 char *l;
 408
 409                 l = strstrip(line);
 410
 411                 if (startswith(l, field)) {
 412                         l += strlen(field);
 413                         l += strspn(l, WHITESPACE);
 414
 415                         l[strcspn(l, WHITESPACE)] = 0;
 416
 417                         return parse_uid(l, uid);
 418                 }
 419         }
 420
 421         return -EIO;
 422 }
 423
 424 int get_process_uid(pid_t pid, uid_t *uid) {
 425         return get_process_id(pid, "Uid:", uid);
 426 }
 427
 428 int get_process_gid(pid_t pid, gid_t *gid) {
 429         assert_cc(sizeof(uid_t) == sizeof(gid_t));
 430         return get_process_id(pid, "Gid:", gid);
 431 }
 432
 433 int get_process_cwd(pid_t pid, char **cwd) {
 434         const char *p;
 435
 436         assert(pid >= 0);
 437
 438         p = procfs_file_alloca(pid, "cwd");
 439
 440         return get_process_link_contents(p, cwd);
 441 }
 442
 443 int get_process_root(pid_t pid, char **root) {
 444         const char *p;
 445
 446         assert(pid >= 0);
 447
 448         p = procfs_file_alloca(pid, "root");
 449
 450         return get_process_link_contents(p, root);
 451 }
 452
 453 int get_process_environ(pid_t pid, char **env) {
 454         _cleanup_fclose_ FILE *f = NULL;
 455         _cleanup_free_ char *outcome = NULL;
 456         int c;
 457         const char *p;
 458         size_t allocated = 0, sz = 0;
 459
 460         assert(pid >= 0);
 461         assert(env);
 462
 463         p = procfs_file_alloca(pid, "environ");
 464
 465         f = fopen(p, "re");
 466         if (!f) {
 467                 if (errno == ENOENT)
 468                         return -ESRCH;
 469                 return -errno;
 470         }
 471
 472         while ((c = fgetc(f)) != EOF) {
 473                 if (!GREEDY_REALLOC(outcome, allocated, sz + 5))
 474                         return -ENOMEM;
 475
 476                 if (c == '\0')
 477                         outcome[sz++] = '\n';
 478                 else
 479                         sz += cescape_char(c, outcome + sz);
 480         }
 481
 482         if (!outcome) {
 483                 outcome = strdup("");
 484                 if (!outcome)
 485                         return -ENOMEM;
 486         } else
 487                 outcome[sz] = '\0';
 488
 489         *env = outcome;
 490         outcome = NULL;
 491
 492         return 0;
 493 }
 494
 495 int get_process_ppid(pid_t pid, pid_t *_ppid) {
 496         int r;
 497         _cleanup_free_ char *line = NULL;
 498         long unsigned ppid;
 499         const char *p;
 500
 501         assert(pid >= 0);
 502         assert(_ppid);
 503
 504         if (pid == 0) {
 505                 *_ppid = getppid();
 506                 return 0;
 507         }
 508
 509         p = procfs_file_alloca(pid, "stat");
 510         r = read_one_line_file(p, &line);
 511         if (r == -ENOENT)
 512                 return -ESRCH;
 513         if (r < 0)
 514                 return r;
 515
 516         /* Let's skip the pid and comm fields. The latter is enclosed
 517          * in () but does not escape any () in its value, so let's
 518          * skip over it manually */
 519
 520         p = strrchr(line, ')');
 521         if (!p)
 522                 return -EIO;
 523
 524         p++;
 525
 526         if (sscanf(p, " "
 527                    "%*c "  /* state */
 528                    "%lu ", /* ppid */
 529                    &ppid) != 1)
 530                 return -EIO;
 531
 532         if ((long unsigned) (pid_t) ppid != ppid)
 533                 return -ERANGE;
 534
 535         *_ppid = (pid_t) ppid;
 536
 537         return 0;
 538 }
 539
 540 int wait_for_terminate(pid_t pid, siginfo_t *status) {
 541         siginfo_t dummy;
 542
 543         assert(pid >= 1);
 544
 545         if (!status)
 546                 status = &dummy;
 547
 548         for (;;) {
 549                 zero(*status);
 550
 551                 if (waitid(P_PID, pid, status, WEXITED) < 0) {
 552
 553                         if (errno == EINTR)
 554                                 continue;
 555
 556                         return negative_errno();
 557                 }
 558
 559                 return 0;
 560         }
 561 }
 562
 563 /*
 564  * Return values:
 565  * < 0 : wait_for_terminate() failed to get the state of the
 566  *       process, the process was terminated by a signal, or
 567  *       failed for an unknown reason.
 568  * >=0 : The process terminated normally, and its exit code is
 569  *       returned.
 570  *
 571  * That is, success is indicated by a return value of zero, and an
 572  * error is indicated by a non-zero value.
 573  *
 574  * A warning is emitted if the process terminates abnormally,
 575  * and also if it returns non-zero unless check_exit_code is true.
 576  */
 577 int wait_for_terminate_and_warn(const char *name, pid_t pid, bool check_exit_code) {
 578         int r;
 579         siginfo_t status;
 580
 581         assert(name);
 582         assert(pid > 1);
 583
 584         r = wait_for_terminate(pid, &status);
 585         if (r < 0)
 586                 return log_warning_errno(r, "Failed to wait for %s: %m", name);
 587
 588         if (status.si_code == CLD_EXITED) {
 589                 if (status.si_status != 0)
 590                         log_full(check_exit_code ? LOG_WARNING : LOG_DEBUG,
 591                                  "%s failed with error code %i.", name, status.si_status);
 592                 else
 593                         log_debug("%s succeeded.", name);
 594
 595                 return status.si_status;
 596         } else if (status.si_code == CLD_KILLED ||
 597                    status.si_code == CLD_DUMPED) {
 598
 599                 log_warning("%s terminated by signal %s.", name, signal_to_string(status.si_status));
 600                 return -EPROTO;
 601         }
 602
 603         log_warning("%s failed due to unknown reason.", name);
 604         return -EPROTO;
 605 }
 606
 607 void sigkill_wait(pid_t pid) {
 608         assert(pid > 1);
 609
 610         if (kill(pid, SIGKILL) > 0)
 611                 (void) wait_for_terminate(pid, NULL);
 612 }
 613
 614 void sigkill_waitp(pid_t *pid) {
 615         if (!pid)
 616                 return;
 617         if (*pid <= 1)
 618                 return;
 619
 620         sigkill_wait(*pid);
 621 }
 622
 623 int kill_and_sigcont(pid_t pid, int sig) {
 624         int r;
 625
 626         r = kill(pid, sig) < 0 ? -errno : 0;
 627
 628         /* If this worked, also send SIGCONT, unless we already just sent a SIGCONT, or SIGKILL was sent which isn't
 629          * affected by a process being suspended anyway. */
 630         if (r >= 0 && !IN_SET(SIGCONT, SIGKILL))
 631                 (void) kill(pid, SIGCONT);
 632
 633         return r;
 634 }
 635
 636 int getenv_for_pid(pid_t pid, const char *field, char **_value) {
 637         _cleanup_fclose_ FILE *f = NULL;
 638         char *value = NULL;
 639         int r;
 640         bool done = false;
 641         size_t l;
 642         const char *path;
 643
 644         assert(pid >= 0);
 645         assert(field);
 646         assert(_value);
 647
 648         path = procfs_file_alloca(pid, "environ");
 649
 650         f = fopen(path, "re");
 651         if (!f) {
 652                 if (errno == ENOENT)
 653                         return -ESRCH;
 654                 return -errno;
 655         }
 656
 657         l = strlen(field);
 658         r = 0;
 659
 660         do {
 661                 char line[LINE_MAX];
 662                 unsigned i;
 663
 664                 for (i = 0; i < sizeof(line)-1; i++) {
 665                         int c;
 666
 667                         c = getc(f);
 668                         if (_unlikely_(c == EOF)) {
 669                                 done = true;
 670                                 break;
 671                         } else if (c == 0)
 672                                 break;
 673
 674                         line[i] = c;
 675                 }
 676                 line[i] = 0;
 677
 678                 if (memcmp(line, field, l) == 0 && line[l] == '=') {
 679                         value = strdup(line + l + 1);
 680                         if (!value)
 681                                 return -ENOMEM;
 682
 683                         r = 1;
 684                         break;
 685                 }
 686
 687         } while (!done);
 688
 689         *_value = value;
 690         return r;
 691 }
 692
 693 bool pid_is_unwaited(pid_t pid) {
 694         /* Checks whether a PID is still valid at all, including a zombie */
 695
 696         if (pid < 0)
 697                 return false;
 698
 699         if (pid <= 1) /* If we or PID 1 would be dead and have been waited for, this code would not be running */
 700                 return true;
 701
 702         if (kill(pid, 0) >= 0)
 703                 return true;
 704
 705         return errno != ESRCH;
 706 }
 707
 708 bool pid_is_alive(pid_t pid) {
 709         int r;
 710
 711         /* Checks whether a PID is still valid and not a zombie */
 712
 713         if (pid < 0)
 714                 return false;
 715
 716         if (pid <= 1) /* If we or PID 1 would be a zombie, this code would not be running */
 717                 return true;
 718
 719         r = get_process_state(pid);
 720         if (r == -ESRCH || r == 'Z')
 721                 return false;
 722
 723         return true;
 724 }
 725
 726 int pid_from_same_root_fs(pid_t pid) {
 727         const char *root;
 728
 729         if (pid < 0)
 730                 return 0;
 731
 732         root = procfs_file_alloca(pid, "root");
 733
 734         return files_same(root, "/proc/1/root");
 735 }
 736
 737 bool is_main_thread(void) {
 738         static thread_local int cached = 0;
 739
 740         if (_unlikely_(cached == 0))
 741                 cached = getpid() == gettid() ? 1 : -1;
 742
 743         return cached > 0;
 744 }
 745
 746 noreturn void freeze(void) {
 747
 748         log_close();
 749
 750         /* Make sure nobody waits for us on a socket anymore */
 751         close_all_fds(NULL, 0);
 752
 753         sync();
 754
 755         for (;;)
 756                 pause();
 757 }
 758
 759 bool oom_score_adjust_is_valid(int oa) {
 760         return oa >= OOM_SCORE_ADJ_MIN && oa <= OOM_SCORE_ADJ_MAX;
 761 }
 762
 763 unsigned long personality_from_string(const char *p) {
 764         int architecture;
 765
 766         if (!p)
 767                 return PERSONALITY_INVALID;
 768
 769         /* Parse a personality specifier. We use our own identifiers that indicate specific ABIs, rather than just
 770          * hints regarding the register size, since we want to keep things open for multiple locally supported ABIs for
 771          * the same register size. */
 772
 773         architecture = architecture_from_string(p);
 774         if (architecture < 0)
 775                 return PERSONALITY_INVALID;
 776
 777         if (architecture == native_architecture())
 778                 return PER_LINUX;
 779 #ifdef SECONDARY_ARCHITECTURE
 780         if (architecture == SECONDARY_ARCHITECTURE)
 781                 return PER_LINUX32;
 782 #endif
 783
 784         return PERSONALITY_INVALID;
 785 }
 786
 787 const char* personality_to_string(unsigned long p) {
 788         int architecture = _ARCHITECTURE_INVALID;
 789
 790         if (p == PER_LINUX)
 791                 architecture = native_architecture();
 792 #ifdef SECONDARY_ARCHITECTURE
 793         else if (p == PER_LINUX32)
 794                 architecture = SECONDARY_ARCHITECTURE;
 795 #endif
 796
 797         if (architecture < 0)
 798                 return NULL;
 799
 800         return architecture_to_string(architecture);
 801 }
 802
 803 void valgrind_summary_hack(void) {
 804 #ifdef HAVE_VALGRIND_VALGRIND_H
 805         if (getpid() == 1 && RUNNING_ON_VALGRIND) {
 806                 pid_t pid;
 807                 pid = raw_clone(SIGCHLD);
 808                 if (pid < 0)
 809                         log_emergency_errno(errno, "Failed to fork off valgrind helper: %m");
 810                 else if (pid == 0)
 811                         exit(EXIT_SUCCESS);
 812                 else {
 813                         log_info("Spawned valgrind helper as PID "PID_FMT".", pid);
 814                         (void) wait_for_terminate(pid, NULL);
 815                 }
 816         }
 817 #endif
 818 }
 819
 820 int pid_compare_func(const void *a, const void *b) {
 821         const pid_t *p = a, *q = b;
 822
 823         /* Suitable for usage in qsort() */
 824
 825         if (*p < *q)
 826                 return -1;
 827         if (*p > *q)
 828                 return 1;
 829         return 0;
 830 }
 831
 832 static const char *const ioprio_class_table[] = {
 833         [IOPRIO_CLASS_NONE] = "none",
 834         [IOPRIO_CLASS_RT] = "realtime",
 835         [IOPRIO_CLASS_BE] = "best-effort",
 836         [IOPRIO_CLASS_IDLE] = "idle"
 837 };
 838
 839 DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(ioprio_class, int, INT_MAX);
 840
 841 static const char *const sigchld_code_table[] = {
 842         [CLD_EXITED] = "exited",
 843         [CLD_KILLED] = "killed",
 844         [CLD_DUMPED] = "dumped",
 845         [CLD_TRAPPED] = "trapped",
 846         [CLD_STOPPED] = "stopped",
 847         [CLD_CONTINUED] = "continued",
 848 };
 849
 850 DEFINE_STRING_TABLE_LOOKUP(sigchld_code, int);
 851
 852 static const char* const sched_policy_table[] = {
 853         [SCHED_OTHER] = "other",
 854         [SCHED_BATCH] = "batch",
 855         [SCHED_IDLE] = "idle",
 856         [SCHED_FIFO] = "fifo",
 857         [SCHED_RR] = "rr"
 858 };
 859
 860 DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(sched_policy, int, INT_MAX);