src/lxc/tools/lxc_top.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2
   3 #include "config.h"
   4
   5 #include <errno.h>
   6 #include <inttypes.h>
   7 #include <signal.h>
   8 #include <stdbool.h>
   9 #include <stdint.h>
  10 #include <stdio.h>
  11 #include <stdlib.h>
  12 #include <string.h>
  13 #include <sys/epoll.h>
  14 #include <sys/ioctl.h>
  15 #include <sys/time.h>
  16 #include <termios.h>
  17 #include <unistd.h>
  18
  19 #include "lxc.h"
  20
  21 #include "arguments.h"
  22 #include "mainloop.h"
  23 #include "utils.h"
  24
  25 #define USER_HZ   100
  26 #define ESC       "\033"
  27 #define TERMCLEAR ESC "[H" ESC "[J"
  28 #define TERMNORM  ESC "[0m"
  29 #define TERMBOLD  ESC "[1m"
  30 #define TERMRVRS  ESC "[7m"
  31
  32 struct blkio_stats {
  33         uint64_t read;
  34         uint64_t write;
  35         uint64_t total;
  36 };
  37
  38 struct stats {
  39         uint64_t mem_used;
  40         uint64_t mem_limit;
  41         uint64_t memsw_used;
  42         uint64_t memsw_limit;
  43         uint64_t kmem_used;
  44         uint64_t kmem_limit;
  45         uint64_t cpu_use_nanos;
  46         uint64_t cpu_use_user;
  47         uint64_t cpu_use_sys;
  48         struct blkio_stats io_service_bytes;
  49         struct blkio_stats io_serviced;
  50 };
  51
  52 struct container_stats {
  53         struct lxc_container *c;
  54         struct stats *stats;
  55 };
  56
  57 static int batch = 0;
  58 static int delay_set = 0;
  59 static int delay = 3;
  60 static char sort_by = 'n';
  61 static int sort_reverse = 0;
  62 static struct termios oldtios;
  63 static struct container_stats *container_stats = NULL;
  64 static int ct_alloc_cnt = 0;
  65
  66 static int my_parser(struct lxc_arguments *args, int c, char *arg)
  67 {
  68         switch (c) {
  69         case 'd':
  70                 delay_set = 1;
  71                 if (lxc_safe_int(arg, &delay) < 0)
  72                         return -1;
  73                 break;
  74         case 'b':
  75                 batch = 1;
  76                 break;
  77         case 's':
  78                 sort_by = arg[0];
  79                 break;
  80         case 'r':
  81                 sort_reverse = 1;
  82                 break;
  83         }
  84
  85         return 0;
  86 }
  87
  88 static const struct option my_longopts[] = {
  89         {"delay",   required_argument, 0, 'd'},
  90         {"batch",   no_argument,       0, 'b'},
  91         {"sort",    required_argument, 0, 's'},
  92         {"reverse", no_argument,       0, 'r'},
  93         LXC_COMMON_OPTIONS
  94 };
  95
  96 static struct lxc_arguments my_args = {
  97         .progname = "lxc-top",
  98         .help     = "\
  99 \n\
 100 \n\
 101 lxc-top monitors the state of the active containers\n\
 102 \n\
 103 Options :\n\
 104   -d, --delay     delay in seconds between refreshes (default: 3.0)\n\
 105   -b, --batch     output designed to capture to a file\n\
 106   -s, --sort      sort by [n,c,b,m] (default: n) where\n\
 107                   n = Name\n\
 108                   c = CPU use\n\
 109                   b = Block I/O use\n\
 110                   m = Memory use\n\
 111                   s = Memory + Swap use\n\
 112                   k = Kernel memory use\n\
 113   -r, --reverse   sort in reverse (descending) order\n",
 114         .name     = ".*",
 115         .options  = my_longopts,
 116         .parser   = my_parser,
 117         .checker  = NULL,
 118         .lxcpath_additional = -1,
 119 };
 120
 121 static void stdin_tios_restore(void)
 122 {
 123         (void)tcsetattr(0, TCSAFLUSH, &oldtios);
 124         fprintf(stderr, "\n");
 125 }
 126
 127 static int stdin_tios_setup(void)
 128 {
 129         struct termios newtios;
 130
 131         if (!isatty(0)) {
 132                 fprintf(stderr, "stdin is not a tty\n");
 133                 return -1;
 134         }
 135
 136         if (tcgetattr(0, &oldtios)) {
 137                 fprintf(stderr, "Failed to get current terminal settings\n");
 138                 return -1;
 139         }
 140
 141         newtios = oldtios;
 142
 143         /* turn off echo and line buffering */
 144         newtios.c_iflag &= ~IGNBRK;
 145         newtios.c_iflag &= BRKINT;
 146         newtios.c_lflag &= ~(ECHO|ICANON);
 147         newtios.c_cc[VMIN] = 1;
 148         newtios.c_cc[VTIME] = 0;
 149
 150         if (tcsetattr(0, TCSAFLUSH, &newtios)) {
 151                 fprintf(stderr, "Failed to set new terminal settings\n");
 152                 return -1;
 153         }
 154
 155         return 0;
 156 }
 157
 158 static int stdin_tios_rows(void)
 159 {
 160         struct winsize wsz;
 161
 162         if (isatty(0) && ioctl(0, TIOCGWINSZ, &wsz) == 0)
 163                 return wsz.ws_row;
 164
 165         return 25;
 166 }
 167
 168 static void sig_handler(int sig)
 169 {
 170         exit(EXIT_SUCCESS);
 171 }
 172
 173 static void size_humanize(unsigned long long val, char *buf, size_t bufsz)
 174 {
 175         int ret;
 176
 177         if (val > 1 << 30) {
 178                 ret = snprintf(buf, bufsz, "%u.%2.2u GiB",
 179                             (unsigned int)(val >> 30),
 180                             (unsigned int)(val & ((1 << 30) - 1)) / 10737419);
 181         } else if (val > 1 << 20) {
 182                 unsigned int x = val + 5243;  /* for rounding */
 183                 ret = snprintf(buf, bufsz, "%u.%2.2u MiB",
 184                             x >> 20, ((x & ((1 << 20) - 1)) * 100) >> 20);
 185         } else if (val > 1 << 10) {
 186                 unsigned int x = val + 5;  /* for rounding */
 187                 ret = snprintf(buf, bufsz, "%u.%2.2u KiB",
 188                             x >> 10, ((x & ((1 << 10) - 1)) * 100) >> 10);
 189         } else {
 190                 ret = snprintf(buf, bufsz, "%3u.00   ", (unsigned int)val);
 191         }
 192
 193         if (ret < 0 || (size_t)ret >= bufsz)
 194                 fprintf(stderr, "Failed to create string\n");
 195 }
 196
 197 static uint64_t stat_get_int(struct lxc_container *c, const char *item)
 198 {
 199         char buf[80];
 200         int len;
 201         uint64_t val;
 202
 203         len = c->get_cgroup_item(c, item, buf, sizeof(buf));
 204         if (len <= 0) {
 205                 fprintf(stderr, "Unable to read cgroup item %s\n", item);
 206                 return 0;
 207         }
 208
 209         val = strtoull(buf, NULL, 0);
 210         return val;
 211 }
 212
 213 static uint64_t stat_match_get_int(struct lxc_container *c, const char *item,
 214                                    const char *match, int column)
 215 {
 216         char buf[4096];
 217         int i,j,len;
 218         uint64_t val = 0;
 219         char **lines, **cols;
 220         size_t matchlen;
 221
 222         len = c->get_cgroup_item(c, item, buf, sizeof(buf));
 223         if (len <= 0) {
 224                 fprintf(stderr, "Unable to read cgroup item %s\n", item);
 225                 goto out;
 226         }
 227
 228         lines = lxc_string_split_and_trim(buf, '\n');
 229         if (!lines)
 230                 goto out;
 231
 232         matchlen = strlen(match);
 233         for (i = 0; lines[i]; i++) {
 234                 if (strncmp(lines[i], match, matchlen) == 0) {
 235                         cols = lxc_string_split_and_trim(lines[i], ' ');
 236                         if (!cols)
 237                                 goto err1;
 238
 239                         for (j = 0; cols[j]; j++) {
 240                                 if (j == column) {
 241                                         val = strtoull(cols[j], NULL, 0);
 242                                         break;
 243                                 }
 244                         }
 245
 246                         lxc_free_array((void **)cols, free);
 247                         break;
 248                 }
 249         }
 250
 251 err1:
 252         lxc_free_array((void **)lines, free);
 253
 254 out:
 255         return val;
 256 }
 257
 258 /*
 259 examples:
 260         blkio.throttle.io_serviced
 261         8:0 Read 4259
 262         8:0 Write 835
 263         8:0 Sync 292
 264         8:0 Async 4802
 265         8:0 Total 5094
 266         Total 5094
 267
 268         blkio.throttle.io_service_bytes
 269         8:0 Read 110309376
 270         8:0 Write 39018496
 271         8:0 Sync 2818048
 272         8:0 Async 146509824
 273         8:0 Total 149327872
 274         Total 149327872
 275 */
 276 static void stat_get_blk_stats(struct lxc_container *c, const char *item,
 277                               struct blkio_stats *stats) {
 278         char buf[4096];
 279         int i, len;
 280         char **lines, **cols;
 281
 282         len = c->get_cgroup_item(c, item, buf, sizeof(buf));
 283         if (len <= 0 || (size_t)len >= sizeof(buf)) {
 284                 fprintf(stderr, "Unable to read cgroup item %s\n", item);
 285                 return;
 286         }
 287
 288         lines = lxc_string_split_and_trim(buf, '\n');
 289         if (!lines)
 290                 return;
 291
 292         memset(stats, 0, sizeof(struct blkio_stats));
 293
 294         for (i = 0; lines[i]; i++) {
 295                 cols = lxc_string_split_and_trim(lines[i], ' ');
 296                 if (!cols)
 297                         goto out;
 298
 299                 if (strncmp(cols[1], "Read", strlen(cols[1])) == 0)
 300                         stats->read += strtoull(cols[2], NULL, 0);
 301                 else if (strncmp(cols[1], "Write", strlen(cols[1])) == 0)
 302                         stats->write += strtoull(cols[2], NULL, 0);
 303
 304                 if (strncmp(cols[0], "Total", strlen(cols[0])) == 0)
 305                         stats->total = strtoull(cols[1], NULL, 0);
 306
 307                 lxc_free_array((void **)cols, free);
 308         }
 309
 310 out:
 311         lxc_free_array((void **)lines, free);
 312         return;
 313 }
 314
 315 static void stats_get(struct lxc_container *c, struct container_stats *ct, struct stats *total)
 316 {
 317         ct->c = c;
 318         ct->stats->mem_used      = stat_get_int(c, "memory.usage_in_bytes");
 319         ct->stats->mem_limit     = stat_get_int(c, "memory.limit_in_bytes");
 320         ct->stats->memsw_used    = stat_get_int(c, "memory.memsw.usage_in_bytes");
 321         ct->stats->memsw_limit   = stat_get_int(c, "memory.memsw.limit_in_bytes");
 322         ct->stats->kmem_used     = stat_get_int(c, "memory.kmem.usage_in_bytes");
 323         ct->stats->kmem_limit    = stat_get_int(c, "memory.kmem.limit_in_bytes");
 324         ct->stats->cpu_use_nanos = stat_get_int(c, "cpuacct.usage");
 325         ct->stats->cpu_use_user  = stat_match_get_int(c, "cpuacct.stat", "user", 1);
 326         ct->stats->cpu_use_sys   = stat_match_get_int(c, "cpuacct.stat", "system", 1);
 327
 328         stat_get_blk_stats(c, "blkio.throttle.io_service_bytes", &ct->stats->io_service_bytes);
 329         stat_get_blk_stats(c, "blkio.throttle.io_serviced", &ct->stats->io_serviced);
 330
 331         if (total) {
 332                 total->mem_used      = total->mem_used      + ct->stats->mem_used;
 333                 total->mem_limit     = total->mem_limit     + ct->stats->mem_limit;
 334                 total->memsw_used    = total->memsw_used    + ct->stats->memsw_used;
 335                 total->memsw_limit   = total->memsw_limit   + ct->stats->memsw_limit;
 336                 total->kmem_used     = total->kmem_used     + ct->stats->kmem_used;
 337                 total->kmem_limit    = total->kmem_limit    + ct->stats->kmem_limit;
 338                 total->cpu_use_nanos = total->cpu_use_nanos + ct->stats->cpu_use_nanos;
 339                 total->cpu_use_user  = total->cpu_use_user  + ct->stats->cpu_use_user;
 340                 total->cpu_use_sys   = total->cpu_use_sys   + ct->stats->cpu_use_sys;
 341                 total->io_service_bytes.total += ct->stats->io_service_bytes.total;
 342                 total->io_service_bytes.read += ct->stats->io_service_bytes.read;
 343                 total->io_service_bytes.write += ct->stats->io_service_bytes.write;
 344         }
 345 }
 346
 347 static void stats_print_header(struct stats *stats)
 348 {
 349         printf(TERMRVRS TERMBOLD);
 350         printf("%-18s %12s %12s %12s %36s %10s", "Container", "CPU",  "CPU",  "CPU",  "BlkIO", "Mem");
 351
 352         if (stats->memsw_used > 0)
 353                 printf(" %10s", "MemSw");
 354
 355         if (stats->kmem_used > 0)
 356                 printf(" %10s", "KMem");
 357         printf("\n");
 358
 359         printf("%-18s %12s %12s %12s %36s %10s", "Name",      "Used", "Sys",  "User", "Total(Read/Write)", "Used");
 360
 361         if (stats->memsw_used > 0)
 362                 printf(" %10s", "Used");
 363
 364         if (stats->kmem_used > 0)
 365                 printf(" %10s", "Used");
 366
 367         printf("\n");
 368         printf(TERMNORM);
 369 }
 370
 371 static void stats_print(const char *name, const struct stats *stats,
 372                         const struct stats *total)
 373 {
 374         char iosb_str[63];
 375         char iosb_total_str[20];
 376         char iosb_read_str[20];
 377         char iosb_write_str[20];
 378         char mem_used_str[20];
 379         char memsw_used_str[20];
 380         char kmem_used_str[20];
 381         struct timeval time_val;
 382         unsigned long long time_ms;
 383         int ret;
 384
 385         if (!batch) {
 386                 size_humanize(stats->io_service_bytes.total, iosb_total_str, sizeof(iosb_total_str));
 387                 size_humanize(stats->io_service_bytes.read, iosb_read_str, sizeof(iosb_read_str));
 388                 size_humanize(stats->io_service_bytes.write, iosb_write_str, sizeof(iosb_write_str));
 389                 size_humanize(stats->mem_used, mem_used_str, sizeof(mem_used_str));
 390
 391                 ret = snprintf(iosb_str, sizeof(iosb_str), "%s(%s/%s)", iosb_total_str, iosb_read_str, iosb_write_str);
 392                 if (ret < 0 || (size_t)ret >= sizeof(iosb_str))
 393                         printf("snprintf'd too many characters: %d\n", ret);
 394
 395                 printf("%-18.18s %12.2f %12.2f %12.2f %36s %10s",
 396                        name,
 397                        (float)stats->cpu_use_nanos / 1000000000,
 398                        (float)stats->cpu_use_sys  / USER_HZ,
 399                        (float)stats->cpu_use_user / USER_HZ,
 400                        iosb_str,
 401                        mem_used_str);
 402
 403                 if (total->memsw_used > 0) {
 404                         size_humanize(stats->memsw_used, memsw_used_str, sizeof(memsw_used_str));
 405                         printf(" %10s", memsw_used_str);
 406                 }
 407                 if (total->kmem_used > 0) {
 408                         size_humanize(stats->kmem_used, kmem_used_str, sizeof(kmem_used_str));
 409                         printf(" %10s", kmem_used_str);
 410                 }
 411         } else {
 412                 (void)gettimeofday(&time_val, NULL);
 413                 time_ms = (unsigned long long) (time_val.tv_sec) * 1000 + (unsigned long long) (time_val.tv_usec) / 1000;
 414                 printf("%" PRIu64 ",%s,%" PRIu64 ",%" PRIu64 ",%" PRIu64
 415                        ",%" PRIu64 ",%" PRIu64 ",%" PRIu64 ",%" PRIu64 ",%" PRIu64,
 416                        (uint64_t)time_ms, name, (uint64_t)stats->cpu_use_nanos,
 417                        (uint64_t)stats->cpu_use_sys,
 418                        (uint64_t)stats->cpu_use_user, (uint64_t)stats->io_service_bytes.total,
 419                        (uint64_t)stats->io_serviced.total, (uint64_t)stats->mem_used,
 420                        (uint64_t)stats->memsw_used, (uint64_t)stats->kmem_used);
 421         }
 422
 423 }
 424
 425 static int cmp_name(const void *sct1, const void *sct2)
 426 {
 427         const struct container_stats *ct1 = sct1;
 428         const struct container_stats *ct2 = sct2;
 429
 430         if (sort_reverse)
 431                 return strncmp(ct2->c->name, ct1->c->name, strlen(ct2->c->name));
 432
 433         return strncmp(ct1->c->name, ct2->c->name, strlen(ct1->c->name));
 434 }
 435
 436 static int cmp_cpuuse(const void *sct1, const void *sct2)
 437 {
 438         const struct container_stats *ct1 = sct1;
 439         const struct container_stats *ct2 = sct2;
 440
 441         if (sort_reverse)
 442                 return ct2->stats->cpu_use_nanos < ct1->stats->cpu_use_nanos;
 443
 444         return ct1->stats->cpu_use_nanos < ct2->stats->cpu_use_nanos;
 445 }
 446
 447 static int cmp_blkio(const void *sct1, const void *sct2)
 448 {
 449         const struct container_stats *ct1 = sct1;
 450         const struct container_stats *ct2 = sct2;
 451
 452         if (sort_reverse)
 453                 return ct2->stats->io_service_bytes.total < ct1->stats->io_service_bytes.total;
 454
 455         return ct1->stats->io_service_bytes.total < ct2->stats->io_service_bytes.total;
 456 }
 457
 458 static int cmp_memory(const void *sct1, const void *sct2)
 459 {
 460         const struct container_stats *ct1 = sct1;
 461         const struct container_stats *ct2 = sct2;
 462
 463         if (sort_reverse)
 464                 return ct2->stats->mem_used < ct1->stats->mem_used;
 465
 466         return ct1->stats->mem_used < ct2->stats->mem_used;
 467 }
 468
 469 static int cmp_memorysw(const void *sct1, const void *sct2)
 470 {
 471         const struct container_stats *ct1 = sct1;
 472         const struct container_stats *ct2 = sct2;
 473
 474         if (sort_reverse)
 475                 return ct2->stats->memsw_used < ct1->stats->memsw_used;
 476
 477         return ct1->stats->memsw_used < ct2->stats->memsw_used;
 478 }
 479
 480 static int cmp_kmemory(const void *sct1, const void *sct2)
 481 {
 482         const struct container_stats *ct1 = sct1;
 483         const struct container_stats *ct2 = sct2;
 484
 485         if (sort_reverse)
 486                 return ct2->stats->kmem_used < ct1->stats->kmem_used;
 487
 488         return ct1->stats->kmem_used < ct2->stats->kmem_used;
 489 }
 490
 491 static void ct_sort(int active)
 492 {
 493         int (*cmp_func)(const void *, const void *);
 494
 495         switch(sort_by) {
 496         default:
 497         case 'n': cmp_func = cmp_name; break;
 498         case 'c': cmp_func = cmp_cpuuse; break;
 499         case 'b': cmp_func = cmp_blkio; break;
 500         case 'm': cmp_func = cmp_memory; break;
 501         case 's': cmp_func = cmp_memorysw; break;
 502         case 'k': cmp_func = cmp_kmemory; break;
 503         }
 504
 505         qsort(container_stats, active, sizeof(*container_stats), (int (*)(const void *,const void *))cmp_func);
 506 }
 507
 508 static void ct_free(void)
 509 {
 510         int i;
 511
 512         for (i = 0; i < ct_alloc_cnt; i++) {
 513                 if (container_stats[i].c) {
 514                         lxc_container_put(container_stats[i].c);
 515                         container_stats[i].c = NULL;
 516                 }
 517
 518                 free(container_stats[i].stats);
 519                 container_stats[i].stats = NULL;
 520         }
 521 }
 522
 523 static void ct_realloc(int active_cnt)
 524 {
 525         if (active_cnt > ct_alloc_cnt) {
 526                 int i;
 527
 528                 ct_free();
 529
 530                 container_stats = realloc(container_stats, sizeof(*container_stats) * active_cnt);
 531                 if (!container_stats) {
 532                         fprintf(stderr, "Cannot alloc mem\n");
 533                         exit(EXIT_FAILURE);
 534                 }
 535
 536                 for (i = 0; i < active_cnt; i++) {
 537                         container_stats[i].stats = malloc(sizeof(*container_stats[0].stats));
 538                         if (!container_stats[i].stats) {
 539                                 fprintf(stderr, "Cannot alloc mem\n");
 540                                 exit(EXIT_FAILURE);
 541                         }
 542                 }
 543
 544                 ct_alloc_cnt = active_cnt;
 545         }
 546 }
 547
 548 static int stdin_handler(int fd, uint32_t events, void *data,
 549                          struct lxc_async_descr *descr)
 550 {
 551         char *in_char = data;
 552
 553         if (events & EPOLLIN) {
 554                 int rc;
 555
 556                 rc = lxc_read_nointr(fd, in_char, sizeof(*in_char));
 557                 if (rc <= 0)
 558                         *in_char = '\0';
 559         }
 560
 561         if (events & EPOLLHUP)
 562                 *in_char = 'q';
 563
 564         return LXC_MAINLOOP_CLOSE;
 565 }
 566
 567 int main(int argc, char *argv[])
 568 {
 569         struct lxc_async_descr descr;
 570         int ret, ct_print_cnt;
 571         char in_char;
 572
 573         ret = EXIT_FAILURE;
 574
 575         if (lxc_arguments_parse(&my_args, argc, argv))
 576                 goto out;
 577
 578         ct_print_cnt = stdin_tios_rows() - 3; /* 3 -> header and total */
 579         if (stdin_tios_setup() < 0) {
 580                 fprintf(stderr, "Failed to setup terminal\n");
 581                 goto out;
 582         }
 583
 584         /* ensure the terminal gets restored */
 585         atexit(stdin_tios_restore);
 586         signal(SIGINT, sig_handler);
 587         signal(SIGQUIT, sig_handler);
 588
 589         if (lxc_mainloop_open(&descr)) {
 590                 fprintf(stderr, "Failed to create mainloop\n");
 591                 goto out;
 592         }
 593
 594         ret = lxc_mainloop_add_handler(&descr, 0,
 595                                        stdin_handler,
 596                                        default_cleanup_handler,
 597                                        &in_char, "stdin_handler");
 598         if (ret) {
 599                 fprintf(stderr, "Failed to add stdin handler\n");
 600                 ret = EXIT_FAILURE;
 601                 goto err1;
 602         }
 603
 604         if (batch && !delay_set)
 605                 delay = 300;
 606
 607         if (batch)
 608                 printf("time_ms,container,cpu_nanos,cpu_sys_userhz,cpu_user_userhz,blkio_bytes,blkio_iops,mem_used_bytes,memsw_used_bytes,kernel_mem_used_bytes\n");
 609
 610         for(;;) {
 611                 struct lxc_container **active;
 612                 int i, active_cnt;
 613                 struct stats total;
 614                 char total_name[30];
 615
 616                 active_cnt = list_active_containers(my_args.lxcpath[0], NULL, &active);
 617                 ct_realloc(active_cnt);
 618
 619                 memset(&total, 0, sizeof(total));
 620
 621                 for (i = 0; i < active_cnt; i++)
 622                         stats_get(active[i], &container_stats[i], &total);
 623
 624                 ct_sort(active_cnt);
 625
 626                 if (!batch) {
 627                         printf(TERMCLEAR);
 628                         stats_print_header(&total);
 629                 }
 630
 631                 for (i = 0; i < active_cnt && i < ct_print_cnt; i++) {
 632                         stats_print(container_stats[i].c->name, container_stats[i].stats, &total);
 633                         printf("\n");
 634                 }
 635
 636                 if (!batch) {
 637                         sprintf(total_name, "TOTAL %d of %d", i, active_cnt);
 638                         stats_print(total_name, &total, &total);
 639                 }
 640                 fflush(stdout);
 641
 642                 for (i = 0; i < active_cnt; i++) {
 643                         lxc_container_put(container_stats[i].c);
 644                         container_stats[i].c = NULL;
 645                 }
 646
 647                 in_char = '\0';
 648
 649                 if (!batch) {
 650                         ret = lxc_mainloop(&descr, 1000 * delay);
 651                         if (ret != 0 || in_char == 'q')
 652                                 break;
 653
 654                         switch(in_char) {
 655                         case 'r':
 656                                 sort_reverse ^= 1;
 657                                 break;
 658                         case 'n':
 659                         case 'c':
 660                         case 'b':
 661                         case 'm':
 662                         case 's':
 663                         case 'k':
 664                                 if (sort_by == in_char)
 665                                         sort_reverse ^= 1;
 666                                 else
 667                                         sort_reverse = 0;
 668                                 sort_by = in_char;
 669                         }
 670                 } else {
 671                         sleep(delay);
 672                 }
 673         }
 674
 675         ret = EXIT_SUCCESS;
 676
 677 err1:
 678         lxc_mainloop_close(&descr);
 679
 680 out:
 681         exit(ret);
 682 }