procps/top.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * A tiny 'top' utility.
   4  *
   5  * This is written specifically for the linux /proc/<PID>/stat(m)
   6  * files format.
   7  *
   8  * This reads the PIDs of all processes and their status and shows
   9  * the status of processes (first ones that fit to screen) at given
  10  * intervals.
  11  *
  12  * NOTES:
  13  * - At startup this changes to /proc, all the reads are then
  14  *   relative to that.
  15  *
  16  * (C) Eero Tamminen <oak at welho dot com>
  17  *
  18  * Rewritten by Vladimir Oleynik (C) 2002 <dzo@simtreas.ru>
  19  *
  20  * Sept 2008: Vineet Gupta <vineet.gupta@arc.com>
  21  * Added Support for reporting SMP Information
  22  * - CPU where process was last seen running
  23  *   (to see effect of sched_setaffinity() etc)
  24  * - CPU time split (idle/IO/wait etc) per CPU
  25  *
  26  * Copyright (c) 1992 Branko Lankester
  27  * Copyright (c) 1992 Roger Binns
  28  * Copyright (C) 1994-1996 Charles L. Blake.
  29  * Copyright (C) 1992-1998 Michael K. Johnson
  30  *
  31  * Licensed under GPLv2, see file LICENSE in this source tree.
  32  */
  33 /* How to snapshot /proc for debugging top problems:
  34  * for f in /proc/[0-9]*""/stat; do
  35  *         n=${f#/proc/}
  36  *         n=${n%/stat}_stat
  37  *         cp $f $n
  38  * done
  39  * cp /proc/stat /proc/meminfo /proc/loadavg .
  40  * top -bn1 >top.out
  41  *
  42  * ...and how to run top on it on another machine:
  43  * rm -rf proc; mkdir proc
  44  * for f in [0-9]*_stat; do
  45  *         p=${f%_stat}
  46  *         mkdir -p proc/$p
  47  *         cp $f proc/$p/stat
  48  * done
  49  * cp stat meminfo loadavg proc
  50  * chroot . ./top -bn1 >top1.out
  51  */
  52
  53 #include "libbb.h"
  54
  55
  56 typedef struct top_status_t {
  57         unsigned long vsz;
  58 #if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
  59         unsigned long ticks;
  60         unsigned pcpu; /* delta of ticks */
  61 #endif
  62         unsigned pid, ppid;
  63         unsigned uid;
  64         char state[4];
  65         char comm[COMM_LEN];
  66 #if ENABLE_FEATURE_TOP_SMP_PROCESS
  67         int last_seen_on_cpu;
  68 #endif
  69 } top_status_t;
  70
  71 typedef struct jiffy_counts_t {
  72         /* Linux 2.4.x has only first four */
  73         unsigned long long usr, nic, sys, idle;
  74         unsigned long long iowait, irq, softirq, steal;
  75         unsigned long long total;
  76         unsigned long long busy;
  77 } jiffy_counts_t;
  78
  79 /* This structure stores some critical information from one frame to
  80    the next. Used for finding deltas. */
  81 typedef struct save_hist {
  82         unsigned long ticks;
  83         pid_t pid;
  84 } save_hist;
  85
  86 typedef int (*cmp_funcp)(top_status_t *P, top_status_t *Q);
  87
  88
  89 enum { SORT_DEPTH = 3 };
  90
  91
  92 struct globals {
  93         top_status_t *top;
  94         int ntop;
  95         smallint inverted;
  96 #if ENABLE_FEATURE_TOPMEM
  97         smallint sort_field;
  98 #endif
  99 #if ENABLE_FEATURE_TOP_SMP_CPU
 100         smallint smp_cpu_info; /* one/many cpu info lines? */
 101 #endif
 102 #if ENABLE_FEATURE_USE_TERMIOS
 103         struct termios initial_settings;
 104 #endif
 105 #if !ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
 106         cmp_funcp sort_function[1];
 107 #else
 108         cmp_funcp sort_function[SORT_DEPTH];
 109         struct save_hist *prev_hist;
 110         int prev_hist_count;
 111         jiffy_counts_t cur_jif, prev_jif;
 112         /* int hist_iterations; */
 113         unsigned total_pcpu;
 114         /* unsigned long total_vsz; */
 115 #endif
 116 #if ENABLE_FEATURE_TOP_SMP_CPU
 117         /* Per CPU samples: current and last */
 118         jiffy_counts_t *cpu_jif, *cpu_prev_jif;
 119         int num_cpus;
 120 #endif
 121         char line_buf[80];
 122 }; //FIX_ALIASING; - large code growth
 123 enum { LINE_BUF_SIZE = COMMON_BUFSIZE - offsetof(struct globals, line_buf) };
 124 #define G (*(struct globals*)&bb_common_bufsiz1)
 125 struct BUG_bad_size {
 126         char BUG_G_too_big[sizeof(G) <= COMMON_BUFSIZE ? 1 : -1];
 127         char BUG_line_buf_too_small[LINE_BUF_SIZE > 80 ? 1 : -1];
 128 };
 129 #define INIT_G() do { } while (0)
 130 #define top              (G.top               )
 131 #define ntop             (G.ntop              )
 132 #define sort_field       (G.sort_field        )
 133 #define inverted         (G.inverted          )
 134 #define smp_cpu_info     (G.smp_cpu_info      )
 135 #define initial_settings (G.initial_settings  )
 136 #define sort_function    (G.sort_function     )
 137 #define prev_hist        (G.prev_hist         )
 138 #define prev_hist_count  (G.prev_hist_count   )
 139 #define cur_jif          (G.cur_jif           )
 140 #define prev_jif         (G.prev_jif          )
 141 #define cpu_jif          (G.cpu_jif           )
 142 #define cpu_prev_jif     (G.cpu_prev_jif      )
 143 #define num_cpus         (G.num_cpus          )
 144 #define total_pcpu       (G.total_pcpu        )
 145 #define line_buf         (G.line_buf          )
 146
 147 enum {
 148         OPT_d = (1 << 0),
 149         OPT_n = (1 << 1),
 150         OPT_b = (1 << 2),
 151         OPT_m = (1 << 3),
 152         OPT_EOF = (1 << 4), /* pseudo: "we saw EOF in stdin" */
 153 };
 154 #define OPT_BATCH_MODE (option_mask32 & OPT_b)
 155
 156
 157 #if ENABLE_FEATURE_USE_TERMIOS
 158 static int pid_sort(top_status_t *P, top_status_t *Q)
 159 {
 160         /* Buggy wrt pids with high bit set */
 161         /* (linux pids are in [1..2^15-1]) */
 162         return (Q->pid - P->pid);
 163 }
 164 #endif
 165
 166 static int mem_sort(top_status_t *P, top_status_t *Q)
 167 {
 168         /* We want to avoid unsigned->signed and truncation errors */
 169         if (Q->vsz < P->vsz) return -1;
 170         return Q->vsz != P->vsz; /* 0 if ==, 1 if > */
 171 }
 172
 173
 174 #if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
 175
 176 static int pcpu_sort(top_status_t *P, top_status_t *Q)
 177 {
 178         /* Buggy wrt ticks with high bit set */
 179         /* Affects only processes for which ticks overflow */
 180         return (int)Q->pcpu - (int)P->pcpu;
 181 }
 182
 183 static int time_sort(top_status_t *P, top_status_t *Q)
 184 {
 185         /* We want to avoid unsigned->signed and truncation errors */
 186         if (Q->ticks < P->ticks) return -1;
 187         return Q->ticks != P->ticks; /* 0 if ==, 1 if > */
 188 }
 189
 190 static int mult_lvl_cmp(void* a, void* b)
 191 {
 192         int i, cmp_val;
 193
 194         for (i = 0; i < SORT_DEPTH; i++) {
 195                 cmp_val = (*sort_function[i])(a, b);
 196                 if (cmp_val != 0)
 197                         break;
 198         }
 199         return inverted ? -cmp_val : cmp_val;
 200 }
 201
 202 static NOINLINE int read_cpu_jiffy(FILE *fp, jiffy_counts_t *p_jif)
 203 {
 204 #if !ENABLE_FEATURE_TOP_SMP_CPU
 205         static const char fmt[] = "cpu %llu %llu %llu %llu %llu %llu %llu %llu";
 206 #else
 207         static const char fmt[] = "cp%*s %llu %llu %llu %llu %llu %llu %llu %llu";
 208 #endif
 209         int ret;
 210
 211         if (!fgets(line_buf, LINE_BUF_SIZE, fp) || line_buf[0] != 'c' /* not "cpu" */)
 212                 return 0;
 213         ret = sscanf(line_buf, fmt,
 214                         &p_jif->usr, &p_jif->nic, &p_jif->sys, &p_jif->idle,
 215                         &p_jif->iowait, &p_jif->irq, &p_jif->softirq,
 216                         &p_jif->steal);
 217         if (ret >= 4) {
 218                 p_jif->total = p_jif->usr + p_jif->nic + p_jif->sys + p_jif->idle
 219                         + p_jif->iowait + p_jif->irq + p_jif->softirq + p_jif->steal;
 220                 /* procps 2.x does not count iowait as busy time */
 221                 p_jif->busy = p_jif->total - p_jif->idle - p_jif->iowait;
 222         }
 223
 224         return ret;
 225 }
 226
 227 static void get_jiffy_counts(void)
 228 {
 229         FILE* fp = xfopen_for_read("stat");
 230
 231         /* We need to parse cumulative counts even if SMP CPU display is on,
 232          * they are used to calculate per process CPU% */
 233         prev_jif = cur_jif;
 234         if (read_cpu_jiffy(fp, &cur_jif) < 4)
 235                 bb_error_msg_and_die("can't read /proc/stat");
 236
 237 #if !ENABLE_FEATURE_TOP_SMP_CPU
 238         fclose(fp);
 239         return;
 240 #else
 241         if (!smp_cpu_info) {
 242                 fclose(fp);
 243                 return;
 244         }
 245
 246         if (!num_cpus) {
 247                 /* First time here. How many CPUs?
 248                  * There will be at least 1 /proc/stat line with cpu%d
 249                  */
 250                 while (1) {
 251                         cpu_jif = xrealloc_vector(cpu_jif, 1, num_cpus);
 252                         if (read_cpu_jiffy(fp, &cpu_jif[num_cpus]) <= 4)
 253                                 break;
 254                         num_cpus++;
 255                 }
 256                 if (num_cpus == 0) /* /proc/stat with only "cpu ..." line?! */
 257                         smp_cpu_info = 0;
 258
 259                 cpu_prev_jif = xzalloc(sizeof(cpu_prev_jif[0]) * num_cpus);
 260
 261                 /* Otherwise the first per cpu display shows all 100% idles */
 262                 usleep(50000);
 263         } else { /* Non first time invocation */
 264                 jiffy_counts_t *tmp;
 265                 int i;
 266
 267                 /* First switch the sample pointers: no need to copy */
 268                 tmp = cpu_prev_jif;
 269                 cpu_prev_jif = cpu_jif;
 270                 cpu_jif = tmp;
 271
 272                 /* Get the new samples */
 273                 for (i = 0; i < num_cpus; i++)
 274                         read_cpu_jiffy(fp, &cpu_jif[i]);
 275         }
 276 #endif
 277         fclose(fp);
 278 }
 279
 280 static void do_stats(void)
 281 {
 282         top_status_t *cur;
 283         pid_t pid;
 284         int i, last_i, n;
 285         struct save_hist *new_hist;
 286
 287         get_jiffy_counts();
 288         total_pcpu = 0;
 289         /* total_vsz = 0; */
 290         new_hist = xmalloc(sizeof(new_hist[0]) * ntop);
 291         /*
 292          * Make a pass through the data to get stats.
 293          */
 294         /* hist_iterations = 0; */
 295         i = 0;
 296         for (n = 0; n < ntop; n++) {
 297                 cur = top + n;
 298
 299                 /*
 300                  * Calculate time in cur process.  Time is sum of user time
 301                  * and system time
 302                  */
 303                 pid = cur->pid;
 304                 new_hist[n].ticks = cur->ticks;
 305                 new_hist[n].pid = pid;
 306
 307                 /* find matching entry from previous pass */
 308                 cur->pcpu = 0;
 309                 /* do not start at index 0, continue at last used one
 310                  * (brought hist_iterations from ~14000 down to 172) */
 311                 last_i = i;
 312                 if (prev_hist_count) do {
 313                         if (prev_hist[i].pid == pid) {
 314                                 cur->pcpu = cur->ticks - prev_hist[i].ticks;
 315                                 total_pcpu += cur->pcpu;
 316                                 break;
 317                         }
 318                         i = (i+1) % prev_hist_count;
 319                         /* hist_iterations++; */
 320                 } while (i != last_i);
 321                 /* total_vsz += cur->vsz; */
 322         }
 323
 324         /*
 325          * Save cur frame's information.
 326          */
 327         free(prev_hist);
 328         prev_hist = new_hist;
 329         prev_hist_count = ntop;
 330 }
 331
 332 #endif /* FEATURE_TOP_CPU_USAGE_PERCENTAGE */
 333
 334 #if ENABLE_FEATURE_TOP_CPU_GLOBAL_PERCENTS && ENABLE_FEATURE_TOP_DECIMALS
 335 /* formats 7 char string (8 with terminating NUL) */
 336 static char *fmt_100percent_8(char pbuf[8], unsigned value, unsigned total)
 337 {
 338         unsigned t;
 339         if (value >= total) { /* 100% ? */
 340                 strcpy(pbuf, "  100% ");
 341                 return pbuf;
 342         }
 343         /* else generate " [N/space]N.N% " string */
 344         value = 1000 * value / total;
 345         t = value / 100;
 346         value = value % 100;
 347         pbuf[0] = ' ';
 348         pbuf[1] = t ? t + '0' : ' ';
 349         pbuf[2] = '0' + (value / 10);
 350         pbuf[3] = '.';
 351         pbuf[4] = '0' + (value % 10);
 352         pbuf[5] = '%';
 353         pbuf[6] = ' ';
 354         pbuf[7] = '\0';
 355         return pbuf;
 356 }
 357 #endif
 358
 359 #if ENABLE_FEATURE_TOP_CPU_GLOBAL_PERCENTS
 360 static void display_cpus(int scr_width, char *scrbuf, int *lines_rem_p)
 361 {
 362         /*
 363          * xxx% = (cur_jif.xxx - prev_jif.xxx) / (cur_jif.total - prev_jif.total) * 100%
 364          */
 365         unsigned total_diff;
 366         jiffy_counts_t *p_jif, *p_prev_jif;
 367         int i;
 368 # if ENABLE_FEATURE_TOP_SMP_CPU
 369         int n_cpu_lines;
 370 # endif
 371
 372         /* using (unsigned) casts to make operations cheaper */
 373 # define  CALC_TOTAL_DIFF do { \
 374         total_diff = (unsigned)(p_jif->total - p_prev_jif->total); \
 375         if (total_diff == 0) total_diff = 1; \
 376 } while (0)
 377
 378 # if ENABLE_FEATURE_TOP_DECIMALS
 379 #  define CALC_STAT(xxx) char xxx[8]
 380 #  define SHOW_STAT(xxx) fmt_100percent_8(xxx, (unsigned)(p_jif->xxx - p_prev_jif->xxx), total_diff)
 381 #  define FMT "%s"
 382 # else
 383 #  define CALC_STAT(xxx) unsigned xxx = 100 * (unsigned)(p_jif->xxx - p_prev_jif->xxx) / total_diff
 384 #  define SHOW_STAT(xxx) xxx
 385 #  define FMT "%4u%% "
 386 # endif
 387
 388 # if !ENABLE_FEATURE_TOP_SMP_CPU
 389         {
 390                 i = 1;
 391                 p_jif = &cur_jif;
 392                 p_prev_jif = &prev_jif;
 393 # else
 394         /* Loop thru CPU(s) */
 395         n_cpu_lines = smp_cpu_info ? num_cpus : 1;
 396         if (n_cpu_lines > *lines_rem_p)
 397                 n_cpu_lines = *lines_rem_p;
 398
 399         for (i = 0; i < n_cpu_lines; i++) {
 400                 p_jif = &cpu_jif[i];
 401                 p_prev_jif = &cpu_prev_jif[i];
 402 # endif
 403                 CALC_TOTAL_DIFF;
 404
 405                 { /* Need a block: CALC_STAT are declarations */
 406                         CALC_STAT(usr);
 407                         CALC_STAT(sys);
 408                         CALC_STAT(nic);
 409                         CALC_STAT(idle);
 410                         CALC_STAT(iowait);
 411                         CALC_STAT(irq);
 412                         CALC_STAT(softirq);
 413                         /*CALC_STAT(steal);*/
 414
 415                         snprintf(scrbuf, scr_width,
 416                                 /* Barely fits in 79 chars when in "decimals" mode. */
 417 # if ENABLE_FEATURE_TOP_SMP_CPU
 418                                 "CPU%s:"FMT"usr"FMT"sys"FMT"nic"FMT"idle"FMT"io"FMT"irq"FMT"sirq",
 419                                 (smp_cpu_info ? utoa(i) : ""),
 420 # else
 421                                 "CPU:"FMT"usr"FMT"sys"FMT"nic"FMT"idle"FMT"io"FMT"irq"FMT"sirq",
 422 # endif
 423                                 SHOW_STAT(usr), SHOW_STAT(sys), SHOW_STAT(nic), SHOW_STAT(idle),
 424                                 SHOW_STAT(iowait), SHOW_STAT(irq), SHOW_STAT(softirq)
 425                                 /*, SHOW_STAT(steal) - what is this 'steal' thing? */
 426                                 /* I doubt anyone wants to know it */
 427                         );
 428                         puts(scrbuf);
 429                 }
 430         }
 431 # undef SHOW_STAT
 432 # undef CALC_STAT
 433 # undef FMT
 434         *lines_rem_p -= i;
 435 }
 436 #else  /* !ENABLE_FEATURE_TOP_CPU_GLOBAL_PERCENTS */
 437 # define display_cpus(scr_width, scrbuf, lines_rem) ((void)0)
 438 #endif
 439
 440 static unsigned long display_header(int scr_width, int *lines_rem_p)
 441 {
 442         FILE *fp;
 443         char buf[80];
 444         char scrbuf[80];
 445         unsigned long total, used, mfree, shared, buffers, cached;
 446
 447         /* read memory info */
 448         fp = xfopen_for_read("meminfo");
 449
 450         /*
 451          * Old kernels (such as 2.4.x) had a nice summary of memory info that
 452          * we could parse, however this is gone entirely in 2.6. Try parsing
 453          * the old way first, and if that fails, parse each field manually.
 454          *
 455          * First, we read in the first line. Old kernels will have bogus
 456          * strings we don't care about, whereas new kernels will start right
 457          * out with MemTotal:
 458          *                              -- PFM.
 459          */
 460         if (fscanf(fp, "MemTotal: %lu %s\n", &total, buf) != 2) {
 461                 fgets(buf, sizeof(buf), fp);    /* skip first line */
 462
 463                 fscanf(fp, "Mem: %lu %lu %lu %lu %lu %lu",
 464                         &total, &used, &mfree, &shared, &buffers, &cached);
 465                 /* convert to kilobytes */
 466                 used /= 1024;
 467                 mfree /= 1024;
 468                 shared /= 1024;
 469                 buffers /= 1024;
 470                 cached /= 1024;
 471                 total /= 1024;
 472         } else {
 473                 /*
 474                  * Revert to manual parsing, which incidentally already has the
 475                  * sizes in kilobytes. This should be safe for both 2.4 and
 476                  * 2.6.
 477                  */
 478                 fscanf(fp, "MemFree: %lu %s\n", &mfree, buf);
 479
 480                 /*
 481                  * MemShared: is no longer present in 2.6. Report this as 0,
 482                  * to maintain consistent behavior with normal procps.
 483                  */
 484                 if (fscanf(fp, "MemShared: %lu %s\n", &shared, buf) != 2)
 485                         shared = 0;
 486
 487                 fscanf(fp, "Buffers: %lu %s\n", &buffers, buf);
 488                 fscanf(fp, "Cached: %lu %s\n", &cached, buf);
 489
 490                 used = total - mfree;
 491         }
 492         fclose(fp);
 493
 494         /* output memory info */
 495         if (scr_width > (int)sizeof(scrbuf))
 496                 scr_width = sizeof(scrbuf);
 497         snprintf(scrbuf, scr_width,
 498                 "Mem: %luK used, %luK free, %luK shrd, %luK buff, %luK cached",
 499                 used, mfree, shared, buffers, cached);
 500         /* go to top & clear to the end of screen */
 501         printf(OPT_BATCH_MODE ? "%s\n" : "\033[H\033[J%s\n", scrbuf);
 502         (*lines_rem_p)--;
 503
 504         /* Display CPU time split as percentage of total time
 505          * This displays either a cumulative line or one line per CPU
 506          */
 507         display_cpus(scr_width, scrbuf, lines_rem_p);
 508
 509         /* read load average as a string */
 510         buf[0] = '\0';
 511         open_read_close("loadavg", buf, sizeof(buf) - 1);
 512         buf[sizeof(buf) - 1] = '\n';
 513         *strchr(buf, '\n') = '\0';
 514         snprintf(scrbuf, scr_width, "Load average: %s", buf);
 515         puts(scrbuf);
 516         (*lines_rem_p)--;
 517
 518         return total;
 519 }
 520
 521 static NOINLINE void display_process_list(int lines_rem, int scr_width)
 522 {
 523         enum {
 524                 BITS_PER_INT = sizeof(int) * 8
 525         };
 526
 527         top_status_t *s;
 528         char vsz_str_buf[8];
 529         unsigned long total_memory = display_header(scr_width, &lines_rem); /* or use total_vsz? */
 530         /* xxx_shift and xxx_scale variables allow us to replace
 531          * expensive divides with multiply and shift */
 532         unsigned pmem_shift, pmem_scale, pmem_half;
 533 #if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
 534         unsigned tmp_unsigned;
 535         unsigned pcpu_shift, pcpu_scale, pcpu_half;
 536         unsigned busy_jifs;
 537 #endif
 538
 539         /* what info of the processes is shown */
 540         printf(OPT_BATCH_MODE ? "%.*s" : "\033[7m%.*s\033[0m", scr_width,
 541                 "  PID  PPID USER     STAT   VSZ %VSZ"
 542                 IF_FEATURE_TOP_SMP_PROCESS(" CPU")
 543                 IF_FEATURE_TOP_CPU_USAGE_PERCENTAGE(" %CPU")
 544                 " COMMAND");
 545         lines_rem--;
 546
 547 #if ENABLE_FEATURE_TOP_DECIMALS
 548 # define UPSCALE 1000
 549 # define CALC_STAT(name, val) div_t name = div((val), 10)
 550 # define SHOW_STAT(name) name.quot, '0'+name.rem
 551 # define FMT "%3u.%c"
 552 #else
 553 # define UPSCALE 100
 554 # define CALC_STAT(name, val) unsigned name = (val)
 555 # define SHOW_STAT(name) name
 556 # define FMT "%4u%%"
 557 #endif
 558         /*
 559          * %VSZ = s->vsz/MemTotal
 560          */
 561         pmem_shift = BITS_PER_INT-11;
 562         pmem_scale = UPSCALE*(1U<<(BITS_PER_INT-11)) / total_memory;
 563         /* s->vsz is in kb. we want (s->vsz * pmem_scale) to never overflow */
 564         while (pmem_scale >= 512) {
 565                 pmem_scale /= 4;
 566                 pmem_shift -= 2;
 567         }
 568         pmem_half = (1U << pmem_shift) / (ENABLE_FEATURE_TOP_DECIMALS ? 20 : 2);
 569 #if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
 570         busy_jifs = cur_jif.busy - prev_jif.busy;
 571         /* This happens if there were lots of short-lived processes
 572          * between two top updates (e.g. compilation) */
 573         if (total_pcpu < busy_jifs) total_pcpu = busy_jifs;
 574
 575         /*
 576          * CPU% = s->pcpu/sum(s->pcpu) * busy_cpu_ticks/total_cpu_ticks
 577          * (pcpu is delta of sys+user time between samples)
 578          */
 579         /* (cur_jif.xxx - prev_jif.xxx) and s->pcpu are
 580          * in 0..~64000 range (HZ*update_interval).
 581          * we assume that unsigned is at least 32-bit.
 582          */
 583         pcpu_shift = 6;
 584         pcpu_scale = UPSCALE*64 * (uint16_t)busy_jifs;
 585         if (pcpu_scale == 0)
 586                 pcpu_scale = 1;
 587         while (pcpu_scale < (1U << (BITS_PER_INT-2))) {
 588                 pcpu_scale *= 4;
 589                 pcpu_shift += 2;
 590         }
 591         tmp_unsigned = (uint16_t)(cur_jif.total - prev_jif.total) * total_pcpu;
 592         if (tmp_unsigned != 0)
 593                 pcpu_scale /= tmp_unsigned;
 594         /* we want (s->pcpu * pcpu_scale) to never overflow */
 595         while (pcpu_scale >= 1024) {
 596                 pcpu_scale /= 4;
 597                 pcpu_shift -= 2;
 598         }
 599         pcpu_half = (1U << pcpu_shift) / (ENABLE_FEATURE_TOP_DECIMALS ? 20 : 2);
 600         /* printf(" pmem_scale=%u pcpu_scale=%u ", pmem_scale, pcpu_scale); */
 601 #endif
 602
 603         /* Ok, all preliminary data is ready, go through the list */
 604         scr_width += 2; /* account for leading '\n' and trailing NUL */
 605         if (lines_rem > ntop)
 606                 lines_rem = ntop;
 607         s = top;
 608         while (--lines_rem >= 0) {
 609                 unsigned col;
 610                 CALC_STAT(pmem, (s->vsz*pmem_scale + pmem_half) >> pmem_shift);
 611 #if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
 612                 CALC_STAT(pcpu, (s->pcpu*pcpu_scale + pcpu_half) >> pcpu_shift);
 613 #endif
 614
 615                 if (s->vsz >= 100000)
 616                         sprintf(vsz_str_buf, "%6ldm", s->vsz/1024);
 617                 else
 618                         sprintf(vsz_str_buf, "%7ld", s->vsz);
 619                 /* PID PPID USER STAT VSZ %VSZ [%CPU] COMMAND */
 620                 col = snprintf(line_buf, scr_width,
 621                                 "\n" "%5u%6u %-8.8s %s%s" FMT
 622                                 IF_FEATURE_TOP_SMP_PROCESS(" %3d")
 623                                 IF_FEATURE_TOP_CPU_USAGE_PERCENTAGE(FMT)
 624                                 " ",
 625                                 s->pid, s->ppid, get_cached_username(s->uid),
 626                                 s->state, vsz_str_buf,
 627                                 SHOW_STAT(pmem)
 628                                 IF_FEATURE_TOP_SMP_PROCESS(, s->last_seen_on_cpu)
 629                                 IF_FEATURE_TOP_CPU_USAGE_PERCENTAGE(, SHOW_STAT(pcpu))
 630                 );
 631                 if ((int)(col + 1) < scr_width)
 632                         read_cmdline(line_buf + col, scr_width - col, s->pid, s->comm);
 633                 fputs(line_buf, stdout);
 634                 /* printf(" %d/%d %lld/%lld", s->pcpu, total_pcpu,
 635                         cur_jif.busy - prev_jif.busy, cur_jif.total - prev_jif.total); */
 636                 s++;
 637         }
 638         /* printf(" %d", hist_iterations); */
 639         bb_putchar(OPT_BATCH_MODE ? '\n' : '\r');
 640         fflush_all();
 641 }
 642 #undef UPSCALE
 643 #undef SHOW_STAT
 644 #undef CALC_STAT
 645 #undef FMT
 646
 647 static void clearmems(void)
 648 {
 649         clear_username_cache();
 650         free(top);
 651         top = NULL;
 652         ntop = 0;
 653 }
 654
 655 #if ENABLE_FEATURE_USE_TERMIOS
 656
 657 static void reset_term(void)
 658 {
 659         tcsetattr_stdin_TCSANOW(&initial_settings);
 660         if (ENABLE_FEATURE_CLEAN_UP) {
 661                 clearmems();
 662 # if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
 663                 free(prev_hist);
 664 # endif
 665         }
 666 }
 667
 668 static void sig_catcher(int sig UNUSED_PARAM)
 669 {
 670         reset_term();
 671         _exit(EXIT_FAILURE);
 672 }
 673
 674 #endif /* FEATURE_USE_TERMIOS */
 675
 676 /*
 677  * TOPMEM support
 678  */
 679
 680 typedef unsigned long mem_t;
 681
 682 typedef struct topmem_status_t {
 683         unsigned pid;
 684         char comm[COMM_LEN];
 685         /* vsz doesn't count /dev/xxx mappings except /dev/zero */
 686         mem_t vsz     ;
 687         mem_t vszrw   ;
 688         mem_t rss     ;
 689         mem_t rss_sh  ;
 690         mem_t dirty   ;
 691         mem_t dirty_sh;
 692         mem_t stack   ;
 693 } topmem_status_t;
 694
 695 enum { NUM_SORT_FIELD = 7 };
 696
 697 #define topmem ((topmem_status_t*)top)
 698
 699 #if ENABLE_FEATURE_TOPMEM
 700
 701 static int topmem_sort(char *a, char *b)
 702 {
 703         int n;
 704         mem_t l, r;
 705
 706         n = offsetof(topmem_status_t, vsz) + (sort_field * sizeof(mem_t));
 707         l = *(mem_t*)(a + n);
 708         r = *(mem_t*)(b + n);
 709         if (l == r) {
 710                 l = ((topmem_status_t*)a)->dirty;
 711                 r = ((topmem_status_t*)b)->dirty;
 712         }
 713         /* We want to avoid unsigned->signed and truncation errors */
 714         /* l>r: -1, l=r: 0, l<r: 1 */
 715         n = (l > r) ? -1 : (l != r);
 716         return inverted ? -n : n;
 717 }
 718
 719 /* display header info (meminfo / loadavg) */
 720 static void display_topmem_header(int scr_width, int *lines_rem_p)
 721 {
 722         enum {
 723                 TOTAL = 0, MFREE, BUF, CACHE,
 724                 SWAPTOTAL, SWAPFREE, DIRTY,
 725                 MWRITE, ANON, MAP, SLAB,
 726                 NUM_FIELDS
 727         };
 728         static const char match[NUM_FIELDS][12] = {
 729                 "\x09" "MemTotal:",  // TOTAL
 730                 "\x08" "MemFree:",   // MFREE
 731                 "\x08" "Buffers:",   // BUF
 732                 "\x07" "Cached:",    // CACHE
 733                 "\x0a" "SwapTotal:", // SWAPTOTAL
 734                 "\x09" "SwapFree:",  // SWAPFREE
 735                 "\x06" "Dirty:",     // DIRTY
 736                 "\x0a" "Writeback:", // MWRITE
 737                 "\x0a" "AnonPages:", // ANON
 738                 "\x07" "Mapped:",    // MAP
 739                 "\x05" "Slab:",      // SLAB
 740         };
 741         char meminfo_buf[4 * 1024];
 742         const char *Z[NUM_FIELDS];
 743         unsigned i;
 744         int sz;
 745
 746         for (i = 0; i < NUM_FIELDS; i++)
 747                 Z[i] = "?";
 748
 749         /* read memory info */
 750         sz = open_read_close("meminfo", meminfo_buf, sizeof(meminfo_buf) - 1);
 751         if (sz >= 0) {
 752                 char *p = meminfo_buf;
 753                 meminfo_buf[sz] = '\0';
 754                 /* Note that fields always appear in the match[] order */
 755                 for (i = 0; i < NUM_FIELDS; i++) {
 756                         char *found = strstr(p, match[i] + 1);
 757                         if (found) {
 758                                 /* Cut "NNNN" out of "    NNNN kb" */
 759                                 char *s = skip_whitespace(found + match[i][0]);
 760                                 p = skip_non_whitespace(s);
 761                                 *p++ = '\0';
 762                                 Z[i] = s;
 763                         }
 764                 }
 765         }
 766
 767         snprintf(line_buf, LINE_BUF_SIZE,
 768                 "Mem total:%s anon:%s map:%s free:%s",
 769                 Z[TOTAL], Z[ANON], Z[MAP], Z[MFREE]);
 770         printf(OPT_BATCH_MODE ? "%.*s\n" : "\033[H\033[J%.*s\n", scr_width, line_buf);
 771
 772         snprintf(line_buf, LINE_BUF_SIZE,
 773                 " slab:%s buf:%s cache:%s dirty:%s write:%s",
 774                 Z[SLAB], Z[BUF], Z[CACHE], Z[DIRTY], Z[MWRITE]);
 775         printf("%.*s\n", scr_width, line_buf);
 776
 777         snprintf(line_buf, LINE_BUF_SIZE,
 778                 "Swap total:%s free:%s", // TODO: % used?
 779                 Z[SWAPTOTAL], Z[SWAPFREE]);
 780         printf("%.*s\n", scr_width, line_buf);
 781
 782         (*lines_rem_p) -= 3;
 783 }
 784
 785 static void ulltoa6_and_space(unsigned long long ul, char buf[6])
 786 {
 787         /* see http://en.wikipedia.org/wiki/Tera */
 788         smart_ulltoa5(ul, buf, " mgtpezy");
 789         buf[5] = ' ';
 790 }
 791
 792 static NOINLINE void display_topmem_process_list(int lines_rem, int scr_width)
 793 {
 794 #define HDR_STR "  PID   VSZ VSZRW   RSS (SHR) DIRTY (SHR) STACK"
 795 #define MIN_WIDTH sizeof(HDR_STR)
 796         const topmem_status_t *s = topmem;
 797
 798         display_topmem_header(scr_width, &lines_rem);
 799         strcpy(line_buf, HDR_STR " COMMAND");
 800         line_buf[5 + sort_field * 6] = '*';
 801         printf(OPT_BATCH_MODE ? "%.*s" : "\e[7m%.*s\e[0m", scr_width, line_buf);
 802         lines_rem--;
 803
 804         if (lines_rem > ntop)
 805                 lines_rem = ntop;
 806         while (--lines_rem >= 0) {
 807                 /* PID VSZ VSZRW RSS (SHR) DIRTY (SHR) COMMAND */
 808                 ulltoa6_and_space(s->pid     , &line_buf[0*6]);
 809                 ulltoa6_and_space(s->vsz     , &line_buf[1*6]);
 810                 ulltoa6_and_space(s->vszrw   , &line_buf[2*6]);
 811                 ulltoa6_and_space(s->rss     , &line_buf[3*6]);
 812                 ulltoa6_and_space(s->rss_sh  , &line_buf[4*6]);
 813                 ulltoa6_and_space(s->dirty   , &line_buf[5*6]);
 814                 ulltoa6_and_space(s->dirty_sh, &line_buf[6*6]);
 815                 ulltoa6_and_space(s->stack   , &line_buf[7*6]);
 816                 line_buf[8*6] = '\0';
 817                 if (scr_width > (int)MIN_WIDTH) {
 818                         read_cmdline(&line_buf[8*6], scr_width - MIN_WIDTH, s->pid, s->comm);
 819                 }
 820                 printf("\n""%.*s", scr_width, line_buf);
 821                 s++;
 822         }
 823         bb_putchar(OPT_BATCH_MODE ? '\n' : '\r');
 824         fflush_all();
 825 #undef HDR_STR
 826 #undef MIN_WIDTH
 827 }
 828
 829 #else
 830 void display_topmem_process_list(int lines_rem, int scr_width);
 831 int topmem_sort(char *a, char *b);
 832 #endif /* TOPMEM */
 833
 834 /*
 835  * end TOPMEM support
 836  */
 837
 838 enum {
 839         TOP_MASK = 0
 840                 | PSSCAN_PID
 841                 | PSSCAN_PPID
 842                 | PSSCAN_VSZ
 843                 | PSSCAN_STIME
 844                 | PSSCAN_UTIME
 845                 | PSSCAN_STATE
 846                 | PSSCAN_COMM
 847                 | PSSCAN_CPU
 848                 | PSSCAN_UIDGID,
 849         TOPMEM_MASK = 0
 850                 | PSSCAN_PID
 851                 | PSSCAN_SMAPS
 852                 | PSSCAN_COMM,
 853         EXIT_MASK = (unsigned)-1,
 854 };
 855
 856 #if ENABLE_FEATURE_USE_TERMIOS
 857 static unsigned handle_input(unsigned scan_mask, unsigned interval)
 858 {
 859         unsigned char c;
 860         struct pollfd pfd[1];
 861
 862         pfd[0].fd = 0;
 863         pfd[0].events = POLLIN;
 864
 865         while (1) {
 866                 if (safe_poll(pfd, 1, interval * 1000) <= 0)
 867                         return scan_mask;
 868                 interval = 0;
 869
 870                 if (safe_read(STDIN_FILENO, &c, 1) != 1) { /* error/EOF? */
 871                         option_mask32 |= OPT_EOF;
 872                         return scan_mask;
 873                 }
 874
 875                 if (c == initial_settings.c_cc[VINTR])
 876                         return EXIT_MASK;
 877                 if (c == initial_settings.c_cc[VEOF])
 878                         return EXIT_MASK;
 879                 c |= 0x20; /* lowercase */
 880                 if (c == 'q')
 881                         return EXIT_MASK;
 882
 883                 if (c == 'n') {
 884                         IF_FEATURE_TOPMEM(scan_mask = TOP_MASK;)
 885                         sort_function[0] = pid_sort;
 886                         continue;
 887                 }
 888                 if (c == 'm') {
 889                         IF_FEATURE_TOPMEM(scan_mask = TOP_MASK;)
 890                         sort_function[0] = mem_sort;
 891 # if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
 892                         sort_function[1] = pcpu_sort;
 893                         sort_function[2] = time_sort;
 894 # endif
 895                         continue;
 896                 }
 897 # if ENABLE_FEATURE_SHOW_THREADS
 898                 if (c == 'h'
 899                  IF_FEATURE_TOPMEM(&& scan_mask != TOPMEM_MASK)
 900                 ) {
 901                         scan_mask ^= PSSCAN_TASKS;
 902                         continue;
 903                 }
 904 # endif
 905 # if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
 906                 if (c == 'p') {
 907                         IF_FEATURE_TOPMEM(scan_mask = TOP_MASK;)
 908                         sort_function[0] = pcpu_sort;
 909                         sort_function[1] = mem_sort;
 910                         sort_function[2] = time_sort;
 911                         continue;
 912                 }
 913                 if (c == 't') {
 914                         IF_FEATURE_TOPMEM(scan_mask = TOP_MASK;)
 915                         sort_function[0] = time_sort;
 916                         sort_function[1] = mem_sort;
 917                         sort_function[2] = pcpu_sort;
 918                         continue;
 919                 }
 920 #  if ENABLE_FEATURE_TOPMEM
 921                 if (c == 's') {
 922                         scan_mask = TOPMEM_MASK;
 923                         free(prev_hist);
 924                         prev_hist = NULL;
 925                         prev_hist_count = 0;
 926                         sort_field = (sort_field + 1) % NUM_SORT_FIELD;
 927                         continue;
 928                 }
 929 #  endif
 930                 if (c == 'r') {
 931                         inverted ^= 1;
 932                         continue;
 933                 }
 934 #  if ENABLE_FEATURE_TOP_SMP_CPU
 935                 /* procps-2.0.18 uses 'C', 3.2.7 uses '1' */
 936                 if (c == 'c' || c == '1') {
 937                         /* User wants to toggle per cpu <> aggregate */
 938                         if (smp_cpu_info) {
 939                                 free(cpu_prev_jif);
 940                                 free(cpu_jif);
 941                                 cpu_jif = &cur_jif;
 942                                 cpu_prev_jif = &prev_jif;
 943                         } else {
 944                                 /* Prepare for xrealloc() */
 945                                 cpu_jif = cpu_prev_jif = NULL;
 946                         }
 947                         num_cpus = 0;
 948                         smp_cpu_info = !smp_cpu_info;
 949                         get_jiffy_counts();
 950                         continue;
 951                 }
 952 #  endif
 953 # endif
 954                 break; /* unknown key -> force refresh */
 955         }
 956
 957         return scan_mask;
 958 }
 959 #endif
 960
 961 //usage:#if ENABLE_FEATURE_SHOW_THREADS || ENABLE_FEATURE_TOP_SMP_CPU
 962 //usage:# define IF_SHOW_THREADS_OR_TOP_SMP(...) __VA_ARGS__
 963 //usage:#else
 964 //usage:# define IF_SHOW_THREADS_OR_TOP_SMP(...)
 965 //usage:#endif
 966 //usage:#define top_trivial_usage
 967 //usage:       "[-b] [-nCOUNT] [-dSECONDS]" IF_FEATURE_TOPMEM(" [-m]")
 968 //usage:#define top_full_usage "\n\n"
 969 //usage:       "Provide a view of process activity in real time."
 970 //usage:   "\n""Read the status of all processes from /proc each SECONDS"
 971 //usage:   "\n""and display a screenful of them."
 972 //usage:   "\n""Keys:"
 973 //usage:   "\n""        N/M"
 974 //usage:                IF_FEATURE_TOP_CPU_USAGE_PERCENTAGE("/P")
 975 //usage:                IF_FEATURE_TOP_CPU_USAGE_PERCENTAGE("/T")
 976 //usage:           ": " IF_FEATURE_TOPMEM("show CPU usage, ") "sort by pid/mem"
 977 //usage:                IF_FEATURE_TOP_CPU_USAGE_PERCENTAGE("/cpu")
 978 //usage:                IF_FEATURE_TOP_CPU_USAGE_PERCENTAGE("/time")
 979 //usage:        IF_FEATURE_TOPMEM(
 980 //usage:   "\n""        S: show memory"
 981 //usage:        )
 982 //usage:   "\n""        R: reverse sort"
 983 //usage:        IF_SHOW_THREADS_OR_TOP_SMP(
 984 //usage:   "\n""        "
 985 //usage:                IF_FEATURE_SHOW_THREADS("H: toggle threads")
 986 //usage:                IF_FEATURE_SHOW_THREADS(IF_FEATURE_TOP_SMP_CPU(", "))
 987 //usage:                IF_FEATURE_TOP_SMP_CPU("1: toggle SMP")
 988 //usage:        )
 989 //usage:   "\n""        Q,^C: exit"
 990 //usage:   "\n"
 991 //usage:   "\n""Options:"
 992 //usage:   "\n""        -b      Batch mode"
 993 //usage:   "\n""        -n N    Exit after N iterations"
 994 //usage:   "\n""        -d N    Delay between updates"
 995 //usage:        IF_FEATURE_TOPMEM(
 996 //usage:   "\n""        -m      Same as 's' key"
 997 //usage:        )
 998
 999 /* Interactive testing:
1000  * echo sss | ./busybox top
1001  * - shows memory screen
1002  * echo sss | ./busybox top -bn1 >mem
1003  * - saves memory screen - the *whole* list, not first NROWS processes!
1004  * echo .m.s.s.s.s.s.s.q | ./busybox top -b >z
1005  * - saves several different screens, and exits
1006  *
1007  * TODO: -i STRING param as a better alternative?
1008  */
1009
1010 int top_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
1011 int top_main(int argc UNUSED_PARAM, char **argv)
1012 {
1013         int iterations;
1014         unsigned lines, col;
1015         unsigned interval;
1016         char *str_interval, *str_iterations;
1017         unsigned scan_mask = TOP_MASK;
1018 #if ENABLE_FEATURE_USE_TERMIOS
1019         struct termios new_settings;
1020 #endif
1021
1022         INIT_G();
1023
1024         interval = 5; /* default update interval is 5 seconds */
1025         iterations = 0; /* infinite */
1026 #if ENABLE_FEATURE_TOP_SMP_CPU
1027         /*num_cpus = 0;*/
1028         /*smp_cpu_info = 0;*/  /* to start with show aggregate */
1029         cpu_jif = &cur_jif;
1030         cpu_prev_jif = &prev_jif;
1031 #endif
1032
1033         /* all args are options; -n NUM */
1034         opt_complementary = "-"; /* options can be specified w/o dash */
1035         col = getopt32(argv, "d:n:b"IF_FEATURE_TOPMEM("m"), &str_interval, &str_iterations);
1036 #if ENABLE_FEATURE_TOPMEM
1037         if (col & OPT_m) /* -m (busybox specific) */
1038                 scan_mask = TOPMEM_MASK;
1039 #endif
1040         if (col & OPT_d) {
1041                 /* work around for "-d 1" -> "-d -1" done by getopt32
1042                  * (opt_complementary == "-" does this) */
1043                 if (str_interval[0] == '-')
1044                         str_interval++;
1045                 /* Need to limit it to not overflow poll timeout */
1046                 interval = xatou16(str_interval);
1047         }
1048         if (col & OPT_n) {
1049                 if (str_iterations[0] == '-')
1050                         str_iterations++;
1051                 iterations = xatou(str_iterations);
1052         }
1053
1054         /* change to /proc */
1055         xchdir("/proc");
1056
1057 #if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
1058         sort_function[0] = pcpu_sort;
1059         sort_function[1] = mem_sort;
1060         sort_function[2] = time_sort;
1061 #else
1062         sort_function[0] = mem_sort;
1063 #endif
1064
1065 #if ENABLE_FEATURE_USE_TERMIOS
1066         tcgetattr(0, (void *) &initial_settings);
1067         memcpy(&new_settings, &initial_settings, sizeof(new_settings));
1068         if (!OPT_BATCH_MODE) {
1069                 /* unbuffered input, turn off echo */
1070                 new_settings.c_lflag &= ~(ISIG | ICANON | ECHO | ECHONL);
1071                 tcsetattr_stdin_TCSANOW(&new_settings);
1072         }
1073
1074         bb_signals(BB_FATAL_SIGS, sig_catcher);
1075
1076         /* Eat initial input, if any */
1077         scan_mask = handle_input(scan_mask, 0);
1078 #endif
1079
1080         while (scan_mask != EXIT_MASK) {
1081                 procps_status_t *p = NULL;
1082
1083                 if (OPT_BATCH_MODE) {
1084                         lines = INT_MAX;
1085                         col = LINE_BUF_SIZE - 2; /* +2 bytes for '\n', NUL */
1086                 } else {
1087                         lines = 24; /* default */
1088                         col = 79;
1089 #if ENABLE_FEATURE_USE_TERMIOS
1090                         /* We output to stdout, we need size of stdout (not stdin)! */
1091                         get_terminal_width_height(STDOUT_FILENO, &col, &lines);
1092                         if (lines < 5 || col < 10) {
1093                                 sleep(interval);
1094                                 continue;
1095                         }
1096 #endif
1097                         if (col > LINE_BUF_SIZE - 2)
1098                                 col = LINE_BUF_SIZE - 2;
1099                 }
1100
1101                 /* read process IDs & status for all the processes */
1102                 while ((p = procps_scan(p, scan_mask)) != NULL) {
1103                         int n;
1104 #if ENABLE_FEATURE_TOPMEM
1105                         if (scan_mask != TOPMEM_MASK)
1106 #endif
1107                         {
1108                                 n = ntop;
1109                                 top = xrealloc_vector(top, 6, ntop++);
1110                                 top[n].pid = p->pid;
1111                                 top[n].ppid = p->ppid;
1112                                 top[n].vsz = p->vsz;
1113 #if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
1114                                 top[n].ticks = p->stime + p->utime;
1115 #endif
1116                                 top[n].uid = p->uid;
1117                                 strcpy(top[n].state, p->state);
1118                                 strcpy(top[n].comm, p->comm);
1119 #if ENABLE_FEATURE_TOP_SMP_PROCESS
1120                                 top[n].last_seen_on_cpu = p->last_seen_on_cpu;
1121 #endif
1122                         }
1123 #if ENABLE_FEATURE_TOPMEM
1124                         else { /* TOPMEM */
1125                                 if (!(p->smaps.mapped_ro | p->smaps.mapped_rw))
1126                                         continue; /* kernel threads are ignored */
1127                                 n = ntop;
1128                                 /* No bug here - top and topmem are the same */
1129                                 top = xrealloc_vector(topmem, 6, ntop++);
1130                                 strcpy(topmem[n].comm, p->comm);
1131                                 topmem[n].pid      = p->pid;
1132                                 topmem[n].vsz      = p->smaps.mapped_rw + p->smaps.mapped_ro;
1133                                 topmem[n].vszrw    = p->smaps.mapped_rw;
1134                                 topmem[n].rss_sh   = p->smaps.shared_clean + p->smaps.shared_dirty;
1135                                 topmem[n].rss      = p->smaps.private_clean + p->smaps.private_dirty + topmem[n].rss_sh;
1136                                 topmem[n].dirty    = p->smaps.private_dirty + p->smaps.shared_dirty;
1137                                 topmem[n].dirty_sh = p->smaps.shared_dirty;
1138                                 topmem[n].stack    = p->smaps.stack;
1139                         }
1140 #endif
1141                 } /* end of "while we read /proc" */
1142                 if (ntop == 0) {
1143                         bb_error_msg("no process info in /proc");
1144                         break;
1145                 }
1146
1147                 if (scan_mask != TOPMEM_MASK) {
1148 #if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
1149                         if (!prev_hist_count) {
1150                                 do_stats();
1151                                 usleep(100000);
1152                                 clearmems();
1153                                 continue;
1154                         }
1155                         do_stats();
1156                         /* TODO: we don't need to sort all 10000 processes, we need to find top 24! */
1157                         qsort(top, ntop, sizeof(top_status_t), (void*)mult_lvl_cmp);
1158 #else
1159                         qsort(top, ntop, sizeof(top_status_t), (void*)(sort_function[0]));
1160 #endif
1161                 }
1162 #if ENABLE_FEATURE_TOPMEM
1163                 else { /* TOPMEM */
1164                         qsort(topmem, ntop, sizeof(topmem_status_t), (void*)topmem_sort);
1165                 }
1166 #endif
1167                 if (scan_mask != TOPMEM_MASK)
1168                         display_process_list(lines, col);
1169 #if ENABLE_FEATURE_TOPMEM
1170                 else
1171                         display_topmem_process_list(lines, col);
1172 #endif
1173                 clearmems();
1174                 if (iterations >= 0 && !--iterations)
1175                         break;
1176 #if !ENABLE_FEATURE_USE_TERMIOS
1177                 sleep(interval);
1178 #else
1179                 if (option_mask32 & OPT_EOF)
1180                         /* EOF on stdin ("top </dev/null") */
1181                         sleep(interval);
1182                 else
1183                         scan_mask = handle_input(scan_mask, interval);
1184 #endif /* FEATURE_USE_TERMIOS */
1185         } /* end of "while (not Q)" */
1186
1187         bb_putchar('\n');
1188 #if ENABLE_FEATURE_USE_TERMIOS
1189         reset_term();
1190 #endif
1191         return EXIT_SUCCESS;
1192 }