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