select.c

   1 /*
   2  * Copyright (C) 2008 Andre Noll <maan@systemlinux.org>
   3  *
   4  * Licensed under the GPL v2. For licencing details see COPYING.
   5  */
   6
   7 /** \file select.c The select mode of adu. */
   8
   9 #include <dirent.h> /* readdir() */
  10 #include "adu.h"
  11 #include "gcc-compat.h"
  12 #include "cmdline.h"
  13 #include "fd.h"
  14 #include "string.h"
  15 #include "error.h"
  16 #include "portable_io.h"
  17 #include "select.cmdline.h"
  18
  19 /** Global dir count. */
  20 static uint64_t num_dirs;
  21 /** Global files count. */
  22 static uint64_t num_files;
  23 /** Global bytes count. */
  24 static uint64_t num_bytes;
  25
  26 /** The decimal representation of an uint64_t never exceeds that size. */
  27 #define FORMATED_VALUE_SIZE 25
  28
  29 /* these get filled in by the select command. */
  30 static char count_unit_buf[4] = "( )", size_unit_buf[4] = "( )";
  31
  32 enum global_stats_flags {
  33         GSF_PRINT_DIRNAME = 1,
  34         GSF_PRINT_BYTES = 2,
  35         GSF_PRINT_FILES = 4,
  36         GSF_COMPUTE_SUMMARY = 8,
  37 };
  38
  39 struct global_stats_info {
  40         uint32_t count;
  41         int ret;
  42         int osl_errno;
  43         enum global_stats_flags flags;
  44 };
  45
  46 enum user_stats_flags {
  47         USF_PRINT_DIRNAME = 1,
  48         USF_PRINT_BYTES = 2,
  49         USF_PRINT_FILES = 4,
  50         USF_COMPUTE_SUMMARY = 8,
  51 };
  52
  53 struct user_stats_info {
  54         uint32_t count;
  55         enum user_stats_flags flags;
  56         int ret;
  57         int osl_errno;
  58         struct user_info *ui;
  59 };
  60
  61 static const uint64_t size_unit_divisors[] = {
  62         [size_unit_arg_b] = 1ULL,
  63         [size_unit_arg_k] = 1024ULL,
  64         [size_unit_arg_m] = 1024ULL * 1024ULL,
  65         [size_unit_arg_g] = 1024ULL * 1024ULL * 1024ULL,
  66         [size_unit_arg_t] = 1024ULL * 1024ULL * 1024ULL * 1024ULL,
  67 };
  68
  69 static const uint64_t count_unit_divisors[] = {
  70
  71         [count_unit_arg_n] = 1ULL,
  72         [count_unit_arg_k] = 1000ULL,
  73         [count_unit_arg_m] = 1000ULL * 1000ULL,
  74         [count_unit_arg_g] = 1000ULL * 1000ULL * 1000ULL,
  75         [count_unit_arg_t] = 1000ULL * 1000ULL * 1000ULL * 1000ULL,
  76 };
  77
  78 static const char size_unit_abbrevs[] = " BKMGT";
  79 static const char count_unit_abbrevs[] = "  kmgt";
  80 static enum enum_size_unit format_size_value(enum enum_size_unit unit,
  81                 uint64_t value, int print_unit, char *result)
  82 {
  83         enum enum_size_unit u = unit;
  84         char unit_buf[2] = "\0\0";
  85
  86         if (unit == size_unit_arg_h) /* human readable */
  87                 for (u = size_unit_arg_b; u < size_unit_arg_t &&
  88                                 value > size_unit_divisors[u + 1]; u++)
  89                         ; /* nothing */
  90         if (print_unit)
  91                 unit_buf[0] = size_unit_abbrevs[u];
  92         sprintf(result, "%llu%s",
  93                 (long long unsigned)value / size_unit_divisors[u], unit_buf);
  94         return u;
  95 }
  96
  97 static enum enum_count_unit format_count_value(enum enum_count_unit unit,
  98                 uint64_t value, int print_unit, char *result)
  99 {
 100         enum enum_count_unit u = unit;
 101         char unit_buf[2] = "\0\0";
 102
 103         if (unit == count_unit_arg_h) /* human readable */
 104                 for (u = count_unit_arg_n; u < count_unit_arg_t &&
 105                                 value > count_unit_divisors[u + 1]; u++)
 106                         ; /* nothing */
 107         if (print_unit)
 108                 unit_buf[0] = count_unit_abbrevs[u];
 109         sprintf(result, "%llu%s",
 110                 (long long unsigned)value / count_unit_divisors[u], unit_buf);
 111         return u;
 112 }
 113
 114 static FILE *output_file;
 115
 116 __printf_1_2 static int output(const char const *fmt, ...)
 117 {
 118         va_list argp;
 119         int ret;
 120
 121         va_start(argp, fmt);
 122         ret = vfprintf(output_file, fmt, argp);
 123         va_end(argp);
 124         return ret < 0? -E_OUTPUT : 1;
 125 }
 126
 127 static int get_dir_name_by_number(uint64_t *dirnum, char **name)
 128 {
 129         char *result = NULL, *tmp;
 130         struct osl_row *row;
 131         uint64_t val = *dirnum;
 132         struct osl_object obj;
 133         int ret;
 134         char *pfx;
 135
 136 again:
 137         obj.data = &val;
 138         obj.size = sizeof(val);
 139         ret = osl(osl_get_row(dir_table, DT_NUM, &obj, &row));
 140         if (ret < 0)
 141                 goto out;
 142         ret = osl(osl_get_object(dir_table, row, DT_PARENT_NUM, &obj));
 143         if (ret < 0)
 144                 goto out;
 145         val = *(uint64_t *)obj.data;
 146         ret = osl(osl_get_object(dir_table, row, DT_NAME, &obj));
 147         if (ret < 0)
 148                 goto out;
 149         pfx = (select_conf.print_base_dir_given || val)? (char *)obj.data :  ".";
 150         tmp = make_message("%s/%s", pfx, result? result : "");
 151         free(result);
 152         result = tmp;
 153         if (val)
 154                 goto again;
 155 out:
 156         if (ret < 0) {
 157                 free(result);
 158                 *name = NULL;
 159         } else {
 160                 assert(result);
 161                 *name = result;
 162         }
 163         return ret;
 164 }
 165
 166 static int get_dir_name_of_row(struct osl_row *dir_table_row, char **name)
 167 {
 168         struct osl_object obj;
 169         int ret;
 170
 171         *name = NULL;
 172         ret = osl(osl_get_object(dir_table, dir_table_row, DT_NUM, &obj));
 173         if (ret < 0)
 174                 return ret;
 175         return get_dir_name_by_number((uint64_t *)obj.data, name);
 176 }
 177
 178 static int user_stats_loop_function(struct osl_row *row, void *data)
 179 {
 180         struct user_stats_info *usi = data;
 181         struct osl_object obj;
 182         int ret, summary = usi->flags & GSF_COMPUTE_SUMMARY;
 183         char formated_value[FORMATED_VALUE_SIZE];
 184
 185         check_signals();
 186         if (!usi->count && !summary) {
 187                 ret = -E_LOOP_COMPLETE;
 188                 goto err;
 189         }
 190         if (summary || (usi->count && (usi->flags & USF_PRINT_FILES))) {
 191                 uint64_t files;
 192                 ret = osl(osl_get_object(usi->ui->table, row, UT_FILES, &obj));
 193                 if (ret < 0)
 194                         goto err;
 195                 files = *(uint64_t *)obj.data;
 196                 if (usi->count && (usi->flags & USF_PRINT_FILES)) {
 197                         format_count_value(select_conf.count_unit_arg, files,
 198                                 select_conf.count_unit_arg == count_unit_arg_h,
 199                                 formated_value);
 200                         ret = output("\t%s%s", formated_value,
 201                                 (usi->flags & (USF_PRINT_BYTES | USF_PRINT_DIRNAME))?
 202                                         "\t" : "\n");
 203                         if (ret < 0)
 204                                 goto err;
 205                 }
 206                 if (summary)
 207                         usi->ui->files += files;
 208         }
 209         if (summary || (usi->count && (usi->flags & USF_PRINT_BYTES))) {
 210                 uint64_t bytes;
 211                 ret = osl(osl_get_object(usi->ui->table, row, UT_BYTES, &obj));
 212                 if (ret < 0)
 213                         goto err;
 214                 bytes = *(uint64_t *)obj.data;
 215                 if (usi->count && (usi->flags & USF_PRINT_BYTES)) {
 216                         format_size_value(select_conf.size_unit_arg, bytes,
 217                                 select_conf.size_unit_arg == size_unit_arg_h,
 218                                 formated_value);
 219                         ret = output("%s%s%s",
 220                                 (usi->flags & USF_PRINT_FILES)? "" : "\t",
 221                                 formated_value,
 222                                 usi->flags & USF_PRINT_DIRNAME?  "\t" : "\n"
 223                         );
 224                         if (ret < 0)
 225                                 goto err;
 226                 }
 227                 if (summary) {
 228                         usi->ui->bytes += bytes;
 229                         usi->ui->dirs++;
 230                 }
 231
 232         }
 233         if (usi->count && (usi->flags & USF_PRINT_DIRNAME)) {
 234                 char *dirname;
 235                 ret = osl(osl_get_object(usi->ui->table, row, UT_DIR_NUM, &obj));
 236                 if (ret < 0)
 237                         goto err;
 238                 ret = get_dir_name_by_number((uint64_t *)obj.data, &dirname);
 239                 if (ret < 0)
 240                         goto err;
 241                 ret = output("%s%s\n",
 242                         (usi->flags & (USF_PRINT_BYTES | USF_PRINT_FILES))? "" : "\t",
 243                         dirname);
 244                 free(dirname);
 245                 if (ret < 0)
 246                         goto err;
 247         }
 248         if (usi->count > 0)
 249                 usi->count--;
 250         return 1;
 251 err:
 252         usi->ret = ret;
 253         usi->osl_errno = (ret == -E_OSL)? osl_errno : 0;
 254         return -1;
 255 }
 256
 257 static int global_stats_loop_function(struct osl_row *row, void *data)
 258 {
 259         struct global_stats_info *gsi = data;
 260         struct osl_object obj;
 261         char *dirname, formated_value[FORMATED_VALUE_SIZE];
 262         int ret, summary = gsi->flags & GSF_COMPUTE_SUMMARY;
 263
 264         check_signals();
 265         if (!gsi->count && !summary) {
 266                 ret = -E_LOOP_COMPLETE;
 267                 goto err;
 268         }
 269         if (summary || (gsi->count && (gsi->flags & GSF_PRINT_FILES))) {
 270                 uint64_t files;
 271                 ret = osl(osl_get_object(dir_table, row, DT_FILES, &obj));
 272                 if (ret < 0)
 273                         goto err;
 274                 files = *(uint64_t *)obj.data;
 275                 if (gsi->count && (gsi->flags & GSF_PRINT_FILES)) {
 276                         format_count_value(select_conf.count_unit_arg, files,
 277                                 select_conf.count_unit_arg == count_unit_arg_h,
 278                                 formated_value);
 279                         ret = output("\t%s%s", formated_value,
 280                                 (gsi->flags & (GSF_PRINT_BYTES | GSF_PRINT_DIRNAME))?
 281                                 "\t" : "\n");
 282                         if (ret < 0)
 283                                 goto err;
 284                 }
 285                 if (summary)
 286                         num_files += files;
 287         }
 288         if (summary || (gsi->count && (gsi->flags & GSF_PRINT_BYTES))) {
 289                 uint64_t bytes;
 290                 ret = osl(osl_get_object(dir_table, row, DT_BYTES, &obj));
 291                 if (ret < 0)
 292                         goto err;
 293                 bytes = *(uint64_t *)obj.data;
 294                 if (gsi->count && (gsi->flags & GSF_PRINT_BYTES)) {
 295                         format_size_value(select_conf.size_unit_arg, bytes,
 296                                 select_conf.size_unit_arg == size_unit_arg_h,
 297                                 formated_value);
 298                         ret = output("%s%s%s",
 299                                 (gsi->flags & GSF_PRINT_FILES)? "" : "\t",
 300                                 formated_value,
 301                                 (gsi->flags & GSF_PRINT_DIRNAME)? "\t" : "\n"
 302                         );
 303                         if (ret < 0)
 304                                 goto err;
 305                 }
 306                 if (summary) {
 307                         num_bytes += bytes;
 308                         num_dirs++;
 309                 }
 310         }
 311         if (gsi->count && (gsi->flags & GSF_PRINT_DIRNAME)) {
 312                 ret = get_dir_name_of_row(row, &dirname);
 313                 if (ret < 0)
 314                         goto err;
 315                 ret = output("%s%s\n",
 316                         (gsi->flags & (GSF_PRINT_BYTES | GSF_PRINT_FILES))? "" : "\t",
 317                         dirname);
 318                 free(dirname);
 319                 if (ret < 0)
 320                         goto err;
 321         }
 322         if (gsi->count > 0)
 323                 gsi->count--;
 324         return 1;
 325 err:
 326         gsi->ret = ret;
 327         gsi->osl_errno = (ret == -E_OSL)? osl_errno : 0;
 328         return -1;
 329 }
 330
 331 static int check_loop_return(int ret, int loop_ret, int loop_osl_errno)
 332 {
 333         if (ret >= 0)
 334                 return ret;
 335         assert(ret == -E_OSL);
 336         if (osl_errno != E_OSL_LOOP)
 337                 /* error not caused by loop function returning negative. */
 338                 return ret;
 339         assert(loop_ret < 0);
 340         if (loop_ret == -E_LOOP_COMPLETE) /* no error */
 341                 return 1;
 342         if (loop_ret == -E_OSL) { /* osl error in loop function */
 343                 assert(loop_osl_errno);
 344                 osl_errno = loop_osl_errno;
 345         }
 346         return loop_ret;
 347 }
 348
 349 static int adu_loop_reverse(struct osl_table *t, unsigned col_num, void *private_data,
 350                 osl_rbtree_loop_func *func, int *loop_ret, int *loop_osl_errno)
 351 {
 352         int ret = osl(osl_rbtree_loop_reverse(t, col_num, private_data, func));
 353         return check_loop_return(ret, *loop_ret, *loop_osl_errno);
 354 }
 355
 356 static int print_global_summary(void)
 357 {
 358         char d[FORMATED_VALUE_SIZE], f[FORMATED_VALUE_SIZE],
 359                 s[FORMATED_VALUE_SIZE];
 360         enum enum_count_unit ud, uf;
 361         enum enum_size_unit us;
 362         int ret;
 363
 364         if (select_conf.no_global_summary_given)
 365                 return 1;
 366         ud = format_count_value(select_conf.count_unit_arg, num_dirs, 0, d);
 367         uf = format_count_value(select_conf.count_unit_arg, num_files, 0, f);
 368         us = format_size_value(select_conf.size_unit_arg, num_bytes, 0, s);
 369
 370         if (!select_conf.no_headers_given) {
 371                 ret = output("Global summary "
 372                         "(dirs(%c)/files(%c)/size(%c))\n",
 373                         count_unit_abbrevs[ud],
 374                         count_unit_abbrevs[uf],
 375                         size_unit_abbrevs[us]
 376                 );
 377                 if (ret < 0)
 378                         return ret;
 379         }
 380         return output("\t%s\t%s\t%s\n\n", d, f, s);
 381 }
 382
 383 static int print_user_summary_line(struct user_info *ui, __a_unused void *data)
 384 {
 385         char formated_dir_count[FORMATED_VALUE_SIZE],
 386                 formated_file_count[FORMATED_VALUE_SIZE],
 387                 formated_bytes[FORMATED_VALUE_SIZE ];
 388
 389         format_count_value(select_conf.count_unit_arg, ui->dirs,
 390                 select_conf.count_unit_arg == count_unit_arg_h,
 391                 formated_dir_count);
 392         format_count_value(select_conf.count_unit_arg, ui->files,
 393                 select_conf.count_unit_arg == count_unit_arg_h,
 394                 formated_file_count);
 395         format_size_value(select_conf.size_unit_arg, ui->bytes,
 396                 select_conf.size_unit_arg == size_unit_arg_h,
 397                 formated_bytes);
 398         return output("\t%s\t%u\t%s\t%s\t%s\n",
 399                 ui->pw_name? ui->pw_name : "?",
 400                 (unsigned)ui->uid,
 401                 formated_dir_count,
 402                 formated_file_count,
 403                 formated_bytes
 404         );
 405 }
 406
 407 static int name_comp(const void *a, const void *b)
 408 {
 409         char *x = ((struct user_info *)a)->pw_name;
 410         char *y = ((struct user_info *)b)->pw_name;
 411
 412         if (!x)
 413                 return 1;
 414         if (!y)
 415                 return -1;
 416         return strcmp(x, y);
 417 }
 418
 419 static int uid_comp(const void *a, const void *b)
 420 {
 421         return -NUM_COMPARE(((struct user_info *)a)->uid,
 422                 ((struct user_info *)b)->uid);
 423 }
 424
 425 static int dir_count_comp(const void *a, const void *b)
 426 {
 427         return NUM_COMPARE(((struct user_info *)a)->dirs,
 428                 ((struct user_info *)b)->dirs);
 429 }
 430
 431 static int file_count_comp(const void *a, const void *b)
 432 {
 433         return NUM_COMPARE(((struct user_info *)a)->files,
 434                 ((struct user_info *)b)->files);
 435 }
 436
 437 static int size_comp(const void *a, const void *b)
 438 {
 439         return NUM_COMPARE(((struct user_info *)a)->bytes,
 440                 ((struct user_info *)b)->bytes);
 441 }
 442
 443 /*
 444  * The comparators for sorting the user summary.
 445  *
 446  * This is an array of pointers to functions taking two constant void *
 447  * pointers and returning an int.
 448  */
 449 static int (*summary_comparators[])(const void *, const void *) = {
 450         [user_summary_sort_arg_name] = name_comp,
 451         [user_summary_sort_arg_uid] = uid_comp,
 452         [user_summary_sort_arg_dir_count] = dir_count_comp,
 453         [user_summary_sort_arg_file_count] = file_count_comp,
 454         [user_summary_sort_arg_size] = size_comp,
 455 };
 456
 457 static int print_user_summary(void)
 458 {
 459         if (select_conf.no_user_summary_given)
 460                 return 1;
 461         if (!select_conf.no_headers_given) {
 462                 int ret = output("User summary "
 463                         "(pw_name/uid/dirs%s/files%s/size%s):\n",
 464                         count_unit_buf, count_unit_buf, size_unit_buf);
 465                 if (ret < 0)
 466                         return ret;
 467         }
 468         sort_hash_table(summary_comparators[select_conf.user_summary_sort_arg]);
 469         return for_each_admissible_user(print_user_summary_line, NULL);
 470 }
 471
 472 static int print_user_list(struct user_info *ui, __a_unused void *data)
 473 {
 474         int ret;
 475         struct user_stats_info usi;
 476         enum enum_user_list ula = select_conf.user_list_arg;
 477         int print_size_list = (ula == user_list_arg_size
 478                 || ula == user_list_arg_both);
 479
 480         if (print_size_list) {
 481                 usi.count = select_conf.limit_arg;
 482                 usi.ui = ui;
 483                 usi.flags = USF_PRINT_DIRNAME | USF_PRINT_BYTES | USF_COMPUTE_SUMMARY;
 484                 if (!select_conf.no_headers_given) {
 485                         ret = output("%s (uid %u), by size%s:\n",
 486                                 ui->pw_name? ui->pw_name : "?", (unsigned)ui->uid,
 487                                 size_unit_buf);
 488                         if (ret < 0)
 489                                 return ret;
 490                 }
 491                 ret = adu_loop_reverse(ui->table, UT_BYTES, &usi, user_stats_loop_function,
 492                         &usi.ret, &usi.osl_errno);
 493                 if (ret < 0)
 494                         return ret;
 495                 ret = output("\n");
 496                 if (ret < 0)
 497                         return ret;
 498         }
 499         if (ula == user_list_arg_file_count || ula == user_list_arg_both) {
 500                 if (!select_conf.no_headers_given) {
 501                         ret = output("%s (uid %u), by file count%s:\n",
 502                                 ui->pw_name? ui->pw_name : "?", (unsigned)ui->uid,
 503                                 count_unit_buf);
 504                         if (ret < 0)
 505                                 return ret;
 506                 }
 507                 usi.count = select_conf.limit_arg,
 508                 usi.ui = ui;
 509                 usi.flags = USF_PRINT_DIRNAME | USF_PRINT_FILES;
 510                 ret = adu_loop_reverse(ui->table, UT_FILES, &usi, user_stats_loop_function,
 511                         &usi.ret, &usi.osl_errno);
 512                 if (ret < 0)
 513                         return ret;
 514                 ret = output("\n");
 515                 if (ret < 0)
 516                         return ret;
 517         }
 518         if (ula == user_list_arg_none && !select_conf.no_user_summary_given) {
 519                 usi.count = select_conf.limit_arg;
 520                 usi.ui = ui;
 521                 usi.flags = USF_COMPUTE_SUMMARY;
 522                 ret = adu_loop_reverse(ui->table, UT_FILES, &usi, user_stats_loop_function,
 523                         &usi.ret, &usi.osl_errno);
 524                 if (ret < 0)
 525                         return ret;
 526         }
 527         return 1;
 528 }
 529
 530 static int print_user_lists(void)
 531 {
 532         return for_each_admissible_user(print_user_list, NULL);
 533 }
 534
 535 static int print_global_lists(void)
 536 {
 537         struct global_stats_info gsi;
 538         int ret;
 539         enum enum_global_list gla = select_conf.global_list_arg;
 540         int print_size_list = (gla == global_list_arg_size
 541                 || gla == global_list_arg_both);
 542
 543         if (print_size_list) {
 544                 gsi.count = select_conf.limit_arg;
 545                 gsi.flags = GSF_PRINT_DIRNAME | GSF_PRINT_BYTES | GSF_COMPUTE_SUMMARY;
 546                 if (!select_conf.no_headers_given) {
 547                         ret = output("By size%s:\n", size_unit_buf);
 548                         if (ret < 0)
 549                                 return ret;
 550                 }
 551                 ret = adu_loop_reverse(dir_table, DT_BYTES, &gsi,
 552                         global_stats_loop_function, &gsi.ret, &gsi.osl_errno);
 553                 if (ret < 0)
 554                         return ret;
 555                 ret = output("\n");
 556                 if (ret < 0)
 557                         return ret;
 558         }
 559         if (gla == global_list_arg_file_count || gla == global_list_arg_both) {
 560                 gsi.count = select_conf.limit_arg;
 561                 gsi.flags = GSF_PRINT_DIRNAME | GSF_PRINT_FILES;
 562                 if (!print_size_list)
 563                         gsi.flags |= GSF_COMPUTE_SUMMARY;
 564                 if (!select_conf.no_headers_given) {
 565                         ret = output("By file count%s:\n", count_unit_buf);
 566                         if (ret < 0)
 567                                 return ret;
 568                 }
 569                 ret = adu_loop_reverse(dir_table, DT_FILES, &gsi,
 570                         global_stats_loop_function, &gsi.ret, &gsi.osl_errno);
 571                 if (ret < 0)
 572                         return ret;
 573                 ret = output("\n");
 574                 if (ret < 0)
 575                         return ret;
 576         }
 577         if (gla == global_list_arg_none && !select_conf.no_global_summary_given) {
 578                 /* must compute summary */
 579                 gsi.count = select_conf.limit_arg;
 580                 gsi.flags = GSF_COMPUTE_SUMMARY;
 581                 ret = adu_loop_reverse(dir_table, DT_FILES, &gsi,
 582                         global_stats_loop_function, &gsi.ret, &gsi.osl_errno);
 583                 if (ret < 0)
 584                         return ret;
 585         }
 586         return 1;
 587 }
 588
 589 static int print_statistics(void)
 590 {
 591         int ret;
 592
 593         ret = print_global_lists();
 594         if (ret < 0)
 595                 return ret;
 596         ret = print_global_summary();
 597         if (ret < 0)
 598                 return ret;
 599         ret = print_user_lists();
 600         if (ret < 0)
 601                 return ret;
 602         ret = print_user_summary();
 603         if (ret < 0)
 604                 return ret;
 605         return 1;
 606 }
 607
 608 static int read_uid_file(struct uid_range *admissible_uids)
 609 {
 610         size_t size;
 611         uint32_t n;
 612         char *filename = get_uid_list_name(), *map;
 613         int ret = mmap_full_file(filename, O_RDONLY, (void **)&map, &size, NULL);
 614         unsigned bits;
 615
 616         if (ret < 0) {
 617                 INFO_LOG("failed to map %s\n", filename);
 618                 free(filename);
 619                 return ret;
 620         }
 621         num_uids = size / 4;
 622         INFO_LOG("found %u uids in %s\n", (unsigned)num_uids, filename);
 623         free(filename);
 624         /*
 625          * Compute number of hash table bits. The hash table size must be a
 626          * power of two and larger than the number of uids.
 627          */
 628         bits = 2;
 629         while (1 << bits < num_uids)
 630                 bits++;
 631         create_hash_table(bits);
 632         for (n = 0; n < num_uids; n++) {
 633                 uint32_t uid = read_u32(map + n * sizeof(uid));
 634                 ret = search_uid(uid, admissible_uids, OPEN_USER_TABLE, NULL);
 635                 if (ret < 0)
 636                         goto out;
 637         }
 638 out:
 639         adu_munmap(map, size);
 640         return ret;
 641 }
 642
 643 int run_select_query(struct uid_range *admissible_uids)
 644 {
 645         int ret;
 646
 647         if (select_conf.output_given && strcmp(select_conf.output_arg, "-")) {
 648                 output_file = fopen(select_conf.output_arg, "w");
 649                 if (!output_file)
 650                         return -ERRNO_TO_ERROR(errno);
 651         } else
 652                 output_file = stdout;
 653
 654         if (select_conf.count_unit_arg != count_unit_arg_h)
 655                 count_unit_buf[1] = count_unit_abbrevs[select_conf.count_unit_arg];
 656         else
 657                 count_unit_buf[0] = '\0';
 658         if (select_conf.size_unit_arg != size_unit_arg_h)
 659                 size_unit_buf[1] = size_unit_abbrevs[select_conf.size_unit_arg];
 660         else
 661                 size_unit_buf[0] = '\0';
 662
 663         ret = open_dir_table(0);
 664         if (ret < 0)
 665                 goto out;
 666         check_signals();
 667         ret = read_uid_file(admissible_uids);
 668         if (ret < 0)
 669                 goto out;
 670         check_signals();
 671         ret = print_statistics();
 672 out:
 673         close_all_tables();
 674         if (output_file != stdout)
 675                 fclose(output_file);
 676         return ret;
 677 }
 678
 679 int com_select(void)
 680 {
 681         int ret;
 682         struct uid_range *admissible_uids = NULL;
 683
 684         if (conf.select_options_given) {
 685                 struct select_cmdline_parser_params params = {
 686                         .override = 1,
 687                         .initialize = 1,
 688                         .check_required = 1,
 689                         .check_ambiguity = 1,
 690                         .print_errors = 1
 691                 };
 692
 693                 if (select_cmdline_parser_string_ext(conf.select_options_arg,
 694                         &select_conf, "select", &params))
 695                         return -E_SYNTAX;
 696                 ret = parse_uid_arg(select_conf.uid_arg, &admissible_uids);
 697                 if (ret < 0)
 698                         return ret;
 699         }
 700         return run_select_query(admissible_uids);
 701 }