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 //config:config TOP
  53 //config:       bool "top"
  54 //config:       default y
  55 //config:       help
  56 //config:         The top program provides a dynamic real-time view of a running
  57 //config:         system.
  58 //config:
  59 //config:config FEATURE_TOP_INTERACTIVE
  60 //config:       bool "Accept keyboard commands"
  61 //config:       default y
  62 //config:       depends on TOP
  63 //config:       help
  64 //config:         Without this, top will only refresh display every 5 seconds.
  65 //config:         No keyboard commands will work, only ^C to terminate.
  66 //config:
  67 //config:config FEATURE_TOP_CPU_USAGE_PERCENTAGE
  68 //config:       bool "Show CPU per-process usage percentage"
  69 //config:       default y
  70 //config:       depends on TOP
  71 //config:       help
  72 //config:         Make top display CPU usage for each process.
  73 //config:         This adds about 2k.
  74 //config:
  75 //config:config FEATURE_TOP_CPU_GLOBAL_PERCENTS
  76 //config:       bool "Show CPU global usage percentage"
  77 //config:       default y
  78 //config:       depends on FEATURE_TOP_CPU_USAGE_PERCENTAGE
  79 //config:       help
  80 //config:         Makes top display "CPU: NN% usr NN% sys..." line.
  81 //config:         This adds about 0.5k.
  82 //config:
  83 //config:config FEATURE_TOP_SMP_CPU
  84 //config:       bool "SMP CPU usage display ('c' key)"
  85 //config:       default y
  86 //config:       depends on FEATURE_TOP_CPU_GLOBAL_PERCENTS
  87 //config:       help
  88 //config:         Allow 'c' key to switch between individual/cumulative CPU stats
  89 //config:         This adds about 0.5k.
  90 //config:
  91 //config:config FEATURE_TOP_DECIMALS
  92 //config:       bool "Show 1/10th of a percent in CPU/mem statistics"
  93 //config:       default y
  94 //config:       depends on FEATURE_TOP_CPU_USAGE_PERCENTAGE
  95 //config:       help
  96 //config:         Show 1/10th of a percent in CPU/mem statistics.
  97 //config:         This adds about 0.3k.
  98 //config:
  99 //config:config FEATURE_TOP_SMP_PROCESS
 100 //config:       bool "Show CPU process runs on ('j' field)"
 101 //config:       default y
 102 //config:       depends on TOP
 103 //config:       help
 104 //config:         Show CPU where process was last found running on.
 105 //config:         This is the 'j' field.
 106 //config:
 107 //config:config FEATURE_TOPMEM
 108 //config:       bool "Topmem command ('s' key)"
 109 //config:       default y
 110 //config:       depends on TOP
 111 //config:       help
 112 //config:         Enable 's' in top (gives lots of memory info).
 113
 114 //applet:IF_TOP(APPLET(top, BB_DIR_USR_BIN, BB_SUID_DROP))
 115
 116 //kbuild:lib-$(CONFIG_TOP) += top.o
 117
 118 #include "libbb.h"
 119 #include "common_bufsiz.h"
 120
 121
 122 typedef struct top_status_t {
 123         unsigned long vsz;
 124 #if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
 125         unsigned long ticks;
 126         unsigned pcpu; /* delta of ticks */
 127 #endif
 128         unsigned pid, ppid;
 129         unsigned uid;
 130         char state[4];
 131         char comm[COMM_LEN];
 132 #if ENABLE_FEATURE_TOP_SMP_PROCESS
 133         int last_seen_on_cpu;
 134 #endif
 135 } top_status_t;
 136
 137 typedef struct jiffy_counts_t {
 138         /* Linux 2.4.x has only first four */
 139         unsigned long long usr, nic, sys, idle;
 140         unsigned long long iowait, irq, softirq, steal;
 141         unsigned long long total;
 142         unsigned long long busy;
 143 } jiffy_counts_t;
 144
 145 /* This structure stores some critical information from one frame to
 146    the next. Used for finding deltas. */
 147 typedef struct save_hist {
 148         unsigned long ticks;
 149         pid_t pid;
 150 } save_hist;
 151
 152 typedef int (*cmp_funcp)(top_status_t *P, top_status_t *Q);
 153
 154
 155 enum { SORT_DEPTH = 3 };
 156
 157
 158 struct globals {
 159         top_status_t *top;
 160         int ntop;
 161         smallint inverted;
 162 #if ENABLE_FEATURE_TOPMEM
 163         smallint sort_field;
 164 #endif
 165 #if ENABLE_FEATURE_TOP_SMP_CPU
 166         smallint smp_cpu_info; /* one/many cpu info lines? */
 167 #endif
 168         unsigned lines;  /* screen height */
 169 #if ENABLE_FEATURE_TOP_INTERACTIVE
 170         struct termios initial_settings;
 171         int scroll_ofs;
 172 #define G_scroll_ofs G.scroll_ofs
 173 #else
 174 #define G_scroll_ofs 0
 175 #endif
 176 #if !ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
 177         cmp_funcp sort_function[1];
 178 #else
 179         cmp_funcp sort_function[SORT_DEPTH];
 180         struct save_hist *prev_hist;
 181         int prev_hist_count;
 182         jiffy_counts_t cur_jif, prev_jif;
 183         /* int hist_iterations; */
 184         unsigned total_pcpu;
 185         /* unsigned long total_vsz; */
 186 #endif
 187 #if ENABLE_FEATURE_TOP_SMP_CPU
 188         /* Per CPU samples: current and last */
 189         jiffy_counts_t *cpu_jif, *cpu_prev_jif;
 190         int num_cpus;
 191 #endif
 192 #if ENABLE_FEATURE_TOP_INTERACTIVE
 193         char kbd_input[KEYCODE_BUFFER_SIZE];
 194 #endif
 195         char line_buf[80];
 196 }; //FIX_ALIASING; - large code growth
 197 enum { LINE_BUF_SIZE = COMMON_BUFSIZE - offsetof(struct globals, line_buf) };
 198 #define G (*(struct globals*)bb_common_bufsiz1)
 199 #define top              (G.top               )
 200 #define ntop             (G.ntop              )
 201 #define sort_field       (G.sort_field        )
 202 #define inverted         (G.inverted          )
 203 #define smp_cpu_info     (G.smp_cpu_info      )
 204 #define initial_settings (G.initial_settings  )
 205 #define sort_function    (G.sort_function     )
 206 #define prev_hist        (G.prev_hist         )
 207 #define prev_hist_count  (G.prev_hist_count   )
 208 #define cur_jif          (G.cur_jif           )
 209 #define prev_jif         (G.prev_jif          )
 210 #define cpu_jif          (G.cpu_jif           )
 211 #define cpu_prev_jif     (G.cpu_prev_jif      )
 212 #define num_cpus         (G.num_cpus          )
 213 #define total_pcpu       (G.total_pcpu        )
 214 #define line_buf         (G.line_buf          )
 215 #define INIT_G() do { \
 216         setup_common_bufsiz(); \
 217         BUILD_BUG_ON(sizeof(G) > COMMON_BUFSIZE); \
 218         BUILD_BUG_ON(LINE_BUF_SIZE <= 80); \
 219 } while (0)
 220
 221 enum {
 222         OPT_d = (1 << 0),
 223         OPT_n = (1 << 1),
 224         OPT_b = (1 << 2),
 225         OPT_m = (1 << 3),
 226         OPT_EOF = (1 << 4), /* pseudo: "we saw EOF in stdin" */
 227 };
 228 #define OPT_BATCH_MODE (option_mask32 & OPT_b)
 229
 230
 231 #if ENABLE_FEATURE_TOP_INTERACTIVE
 232 static int pid_sort(top_status_t *P, top_status_t *Q)
 233 {
 234         /* Buggy wrt pids with high bit set */
 235         /* (linux pids are in [1..2^15-1]) */
 236         return (Q->pid - P->pid);
 237 }
 238 #endif
 239
 240 static int mem_sort(top_status_t *P, top_status_t *Q)
 241 {
 242         /* We want to avoid unsigned->signed and truncation errors */
 243         if (Q->vsz < P->vsz) return -1;
 244         return Q->vsz != P->vsz; /* 0 if ==, 1 if > */
 245 }
 246
 247
 248 #if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
 249
 250 static int pcpu_sort(top_status_t *P, top_status_t *Q)
 251 {
 252         /* Buggy wrt ticks with high bit set */
 253         /* Affects only processes for which ticks overflow */
 254         return (int)Q->pcpu - (int)P->pcpu;
 255 }
 256
 257 static int time_sort(top_status_t *P, top_status_t *Q)
 258 {
 259         /* We want to avoid unsigned->signed and truncation errors */
 260         if (Q->ticks < P->ticks) return -1;
 261         return Q->ticks != P->ticks; /* 0 if ==, 1 if > */
 262 }
 263
 264 static int mult_lvl_cmp(void* a, void* b)
 265 {
 266         int i, cmp_val;
 267
 268         for (i = 0; i < SORT_DEPTH; i++) {
 269                 cmp_val = (*sort_function[i])(a, b);
 270                 if (cmp_val != 0)
 271                         break;
 272         }
 273         return inverted ? -cmp_val : cmp_val;
 274 }
 275
 276 static NOINLINE int read_cpu_jiffy(FILE *fp, jiffy_counts_t *p_jif)
 277 {
 278 #if !ENABLE_FEATURE_TOP_SMP_CPU
 279         static const char fmt[] ALIGN1 = "cpu %llu %llu %llu %llu %llu %llu %llu %llu";
 280 #else
 281         static const char fmt[] ALIGN1 = "cp%*s %llu %llu %llu %llu %llu %llu %llu %llu";
 282 #endif
 283         int ret;
 284
 285         if (!fgets(line_buf, LINE_BUF_SIZE, fp) || line_buf[0] != 'c' /* not "cpu" */)
 286                 return 0;
 287         ret = sscanf(line_buf, fmt,
 288                         &p_jif->usr, &p_jif->nic, &p_jif->sys, &p_jif->idle,
 289                         &p_jif->iowait, &p_jif->irq, &p_jif->softirq,
 290                         &p_jif->steal);
 291         if (ret >= 4) {
 292                 p_jif->total = p_jif->usr + p_jif->nic + p_jif->sys + p_jif->idle
 293                         + p_jif->iowait + p_jif->irq + p_jif->softirq + p_jif->steal;
 294                 /* procps 2.x does not count iowait as busy time */
 295                 p_jif->busy = p_jif->total - p_jif->idle - p_jif->iowait;
 296         }
 297
 298         return ret;
 299 }
 300
 301 static void get_jiffy_counts(void)
 302 {
 303         FILE* fp = xfopen_for_read("stat");
 304
 305         /* We need to parse cumulative counts even if SMP CPU display is on,
 306          * they are used to calculate per process CPU% */
 307         prev_jif = cur_jif;
 308         if (read_cpu_jiffy(fp, &cur_jif) < 4)
 309                 bb_error_msg_and_die("can't read '%s'", "/proc/stat");
 310
 311 #if !ENABLE_FEATURE_TOP_SMP_CPU
 312         fclose(fp);
 313         return;
 314 #else
 315         if (!smp_cpu_info) {
 316                 fclose(fp);
 317                 return;
 318         }
 319
 320         if (!num_cpus) {
 321                 /* First time here. How many CPUs?
 322                  * There will be at least 1 /proc/stat line with cpu%d
 323                  */
 324                 while (1) {
 325                         cpu_jif = xrealloc_vector(cpu_jif, 1, num_cpus);
 326                         if (read_cpu_jiffy(fp, &cpu_jif[num_cpus]) <= 4)
 327                                 break;
 328                         num_cpus++;
 329                 }
 330                 if (num_cpus == 0) /* /proc/stat with only "cpu ..." line?! */
 331                         smp_cpu_info = 0;
 332
 333                 cpu_prev_jif = xzalloc(sizeof(cpu_prev_jif[0]) * num_cpus);
 334
 335                 /* Otherwise the first per cpu display shows all 100% idles */
 336                 usleep(50000);
 337         } else { /* Non first time invocation */
 338                 jiffy_counts_t *tmp;
 339                 int i;
 340
 341                 /* First switch the sample pointers: no need to copy */
 342                 tmp = cpu_prev_jif;
 343                 cpu_prev_jif = cpu_jif;
 344                 cpu_jif = tmp;
 345
 346                 /* Get the new samples */
 347                 for (i = 0; i < num_cpus; i++)
 348                         read_cpu_jiffy(fp, &cpu_jif[i]);
 349         }
 350 #endif
 351         fclose(fp);
 352 }
 353
 354 static void do_stats(void)
 355 {
 356         top_status_t *cur;
 357         pid_t pid;
 358         int i, last_i, n;
 359         struct save_hist *new_hist;
 360
 361         get_jiffy_counts();
 362         total_pcpu = 0;
 363         /* total_vsz = 0; */
 364         new_hist = xmalloc(sizeof(new_hist[0]) * ntop);
 365         /*
 366          * Make a pass through the data to get stats.
 367          */
 368         /* hist_iterations = 0; */
 369         i = 0;
 370         for (n = 0; n < ntop; n++) {
 371                 cur = top + n;
 372
 373                 /*
 374                  * Calculate time in cur process.  Time is sum of user time
 375                  * and system time
 376                  */
 377                 pid = cur->pid;
 378                 new_hist[n].ticks = cur->ticks;
 379                 new_hist[n].pid = pid;
 380
 381                 /* find matching entry from previous pass */
 382                 cur->pcpu = 0;
 383                 /* do not start at index 0, continue at last used one
 384                  * (brought hist_iterations from ~14000 down to 172) */
 385                 last_i = i;
 386                 if (prev_hist_count) do {
 387                         if (prev_hist[i].pid == pid) {
 388                                 cur->pcpu = cur->ticks - prev_hist[i].ticks;
 389                                 total_pcpu += cur->pcpu;
 390                                 break;
 391                         }
 392                         i = (i+1) % prev_hist_count;
 393                         /* hist_iterations++; */
 394                 } while (i != last_i);
 395                 /* total_vsz += cur->vsz; */
 396         }
 397
 398         /*
 399          * Save cur frame's information.
 400          */
 401         free(prev_hist);
 402         prev_hist = new_hist;
 403         prev_hist_count = ntop;
 404 }
 405
 406 #endif /* FEATURE_TOP_CPU_USAGE_PERCENTAGE */
 407
 408 #if ENABLE_FEATURE_TOP_CPU_GLOBAL_PERCENTS && ENABLE_FEATURE_TOP_DECIMALS
 409 /* formats 7 char string (8 with terminating NUL) */
 410 static char *fmt_100percent_8(char pbuf[8], unsigned value, unsigned total)
 411 {
 412         unsigned t;
 413         if (value >= total) { /* 100% ? */
 414                 strcpy(pbuf, "  100% ");
 415                 return pbuf;
 416         }
 417         /* else generate " [N/space]N.N% " string */
 418         value = 1000 * value / total;
 419         t = value / 100;
 420         value = value % 100;
 421         pbuf[0] = ' ';
 422         pbuf[1] = t ? t + '0' : ' ';
 423         pbuf[2] = '0' + (value / 10);
 424         pbuf[3] = '.';
 425         pbuf[4] = '0' + (value % 10);
 426         pbuf[5] = '%';
 427         pbuf[6] = ' ';
 428         pbuf[7] = '\0';
 429         return pbuf;
 430 }
 431 #endif
 432
 433 #if ENABLE_FEATURE_TOP_CPU_GLOBAL_PERCENTS
 434 static void display_cpus(int scr_width, char *scrbuf, int *lines_rem_p)
 435 {
 436         /*
 437          * xxx% = (cur_jif.xxx - prev_jif.xxx) / (cur_jif.total - prev_jif.total) * 100%
 438          */
 439         unsigned total_diff;
 440         jiffy_counts_t *p_jif, *p_prev_jif;
 441         int i;
 442 # if ENABLE_FEATURE_TOP_SMP_CPU
 443         int n_cpu_lines;
 444 # endif
 445
 446         /* using (unsigned) casts to make operations cheaper */
 447 # define  CALC_TOTAL_DIFF do { \
 448         total_diff = (unsigned)(p_jif->total - p_prev_jif->total); \
 449         if (total_diff == 0) total_diff = 1; \
 450 } while (0)
 451
 452 # if ENABLE_FEATURE_TOP_DECIMALS
 453 #  define CALC_STAT(xxx) char xxx[8]
 454 #  define SHOW_STAT(xxx) fmt_100percent_8(xxx, (unsigned)(p_jif->xxx - p_prev_jif->xxx), total_diff)
 455 #  define FMT "%s"
 456 # else
 457 #  define CALC_STAT(xxx) unsigned xxx = 100 * (unsigned)(p_jif->xxx - p_prev_jif->xxx) / total_diff
 458 #  define SHOW_STAT(xxx) xxx
 459 #  define FMT "%4u%% "
 460 # endif
 461
 462 # if !ENABLE_FEATURE_TOP_SMP_CPU
 463         {
 464                 i = 1;
 465                 p_jif = &cur_jif;
 466                 p_prev_jif = &prev_jif;
 467 # else
 468         /* Loop thru CPU(s) */
 469         n_cpu_lines = smp_cpu_info ? num_cpus : 1;
 470         if (n_cpu_lines > *lines_rem_p)
 471                 n_cpu_lines = *lines_rem_p;
 472
 473         for (i = 0; i < n_cpu_lines; i++) {
 474                 p_jif = &cpu_jif[i];
 475                 p_prev_jif = &cpu_prev_jif[i];
 476 # endif
 477                 CALC_TOTAL_DIFF;
 478
 479                 { /* Need a block: CALC_STAT are declarations */
 480                         CALC_STAT(usr);
 481                         CALC_STAT(sys);
 482                         CALC_STAT(nic);
 483                         CALC_STAT(idle);
 484                         CALC_STAT(iowait);
 485                         CALC_STAT(irq);
 486                         CALC_STAT(softirq);
 487                         /*CALC_STAT(steal);*/
 488
 489                         snprintf(scrbuf, scr_width,
 490                                 /* Barely fits in 79 chars when in "decimals" mode. */
 491 # if ENABLE_FEATURE_TOP_SMP_CPU
 492                                 "CPU%s:"FMT"usr"FMT"sys"FMT"nic"FMT"idle"FMT"io"FMT"irq"FMT"sirq",
 493                                 (smp_cpu_info ? utoa(i) : ""),
 494 # else
 495                                 "CPU:"FMT"usr"FMT"sys"FMT"nic"FMT"idle"FMT"io"FMT"irq"FMT"sirq",
 496 # endif
 497                                 SHOW_STAT(usr), SHOW_STAT(sys), SHOW_STAT(nic), SHOW_STAT(idle),
 498                                 SHOW_STAT(iowait), SHOW_STAT(irq), SHOW_STAT(softirq)
 499                                 /*, SHOW_STAT(steal) - what is this 'steal' thing? */
 500                                 /* I doubt anyone wants to know it */
 501                         );
 502                         puts(scrbuf);
 503                 }
 504         }
 505 # undef SHOW_STAT
 506 # undef CALC_STAT
 507 # undef FMT
 508         *lines_rem_p -= i;
 509 }
 510 #else  /* !ENABLE_FEATURE_TOP_CPU_GLOBAL_PERCENTS */
 511 # define display_cpus(scr_width, scrbuf, lines_rem) ((void)0)
 512 #endif
 513
 514 enum {
 515         MI_MEMTOTAL,
 516         MI_MEMFREE,
 517         MI_MEMSHARED,
 518         MI_SHMEM,
 519         MI_BUFFERS,
 520         MI_CACHED,
 521         MI_SWAPTOTAL,
 522         MI_SWAPFREE,
 523         MI_DIRTY,
 524         MI_WRITEBACK,
 525         MI_ANONPAGES,
 526         MI_MAPPED,
 527         MI_SLAB,
 528         MI_MAX
 529 };
 530
 531 static void parse_meminfo(unsigned long meminfo[MI_MAX])
 532 {
 533         static const char fields[] ALIGN1 =
 534                 "MemTotal\0"
 535                 "MemFree\0"
 536                 "MemShared\0"
 537                 "Shmem\0"
 538                 "Buffers\0"
 539                 "Cached\0"
 540                 "SwapTotal\0"
 541                 "SwapFree\0"
 542                 "Dirty\0"
 543                 "Writeback\0"
 544                 "AnonPages\0"
 545                 "Mapped\0"
 546                 "Slab\0";
 547         char buf[60]; /* actual lines we expect are ~30 chars or less */
 548         FILE *f;
 549         int i;
 550
 551         memset(meminfo, 0, sizeof(meminfo[0]) * MI_MAX);
 552         f = xfopen_for_read("meminfo");
 553         while (fgets(buf, sizeof(buf), f) != NULL) {
 554                 char *c = strchr(buf, ':');
 555                 if (!c)
 556                         continue;
 557                 *c = '\0';
 558                 i = index_in_strings(fields, buf);
 559                 if (i >= 0)
 560                         meminfo[i] = strtoul(c+1, NULL, 10);
 561         }
 562         fclose(f);
 563 }
 564
 565 static unsigned long display_header(int scr_width, int *lines_rem_p)
 566 {
 567         char scrbuf[100]; /* [80] was a bit too low on 8Gb ram box */
 568         char *buf;
 569         unsigned long meminfo[MI_MAX];
 570
 571         parse_meminfo(meminfo);
 572
 573         /* Output memory info */
 574         if (scr_width > (int)sizeof(scrbuf))
 575                 scr_width = sizeof(scrbuf);
 576         snprintf(scrbuf, scr_width,
 577                 "Mem: %luK used, %luK free, %luK shrd, %luK buff, %luK cached",
 578                 meminfo[MI_MEMTOTAL] - meminfo[MI_MEMFREE],
 579                 meminfo[MI_MEMFREE],
 580                 meminfo[MI_MEMSHARED] + meminfo[MI_SHMEM],
 581                 meminfo[MI_BUFFERS],
 582                 meminfo[MI_CACHED]);
 583         /* Go to top & clear to the end of screen */
 584         printf(OPT_BATCH_MODE ? "%s\n" : "\033[H\033[J%s\n", scrbuf);
 585         (*lines_rem_p)--;
 586
 587         /* Display CPU time split as percentage of total time.
 588          * This displays either a cumulative line or one line per CPU.
 589          */
 590         display_cpus(scr_width, scrbuf, lines_rem_p);
 591
 592         /* Read load average as a string */
 593         buf = stpcpy(scrbuf, "Load average: ");
 594         open_read_close("loadavg", buf, sizeof(scrbuf) - sizeof("Load average: "));
 595         scrbuf[scr_width - 1] = '\0';
 596         strchrnul(buf, '\n')[0] = '\0';
 597         puts(scrbuf);
 598         (*lines_rem_p)--;
 599
 600         return meminfo[MI_MEMTOTAL];
 601 }
 602
 603 static NOINLINE void display_process_list(int lines_rem, int scr_width)
 604 {
 605         enum {
 606                 BITS_PER_INT = sizeof(int) * 8
 607         };
 608
 609         top_status_t *s;
 610         char vsz_str_buf[8];
 611         unsigned long total_memory = display_header(scr_width, &lines_rem); /* or use total_vsz? */
 612         /* xxx_shift and xxx_scale variables allow us to replace
 613          * expensive divides with multiply and shift */
 614         unsigned pmem_shift, pmem_scale, pmem_half;
 615 #if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
 616         unsigned tmp_unsigned;
 617         unsigned pcpu_shift, pcpu_scale, pcpu_half;
 618         unsigned busy_jifs;
 619 #endif
 620
 621         /* what info of the processes is shown */
 622         printf(OPT_BATCH_MODE ? "%.*s" : "\033[7m%.*s\033[0m", scr_width,
 623                 "  PID  PPID USER     STAT   VSZ %VSZ"
 624                 IF_FEATURE_TOP_SMP_PROCESS(" CPU")
 625                 IF_FEATURE_TOP_CPU_USAGE_PERCENTAGE(" %CPU")
 626                 " COMMAND");
 627         lines_rem--;
 628
 629 #if ENABLE_FEATURE_TOP_DECIMALS
 630 # define UPSCALE 1000
 631 # define CALC_STAT(name, val) div_t name = div((val), 10)
 632 # define SHOW_STAT(name) name.quot, '0'+name.rem
 633 # define FMT "%3u.%c"
 634 #else
 635 # define UPSCALE 100
 636 # define CALC_STAT(name, val) unsigned name = (val)
 637 # define SHOW_STAT(name) name
 638 # define FMT "%4u%%"
 639 #endif
 640         /*
 641          * %VSZ = s->vsz/MemTotal
 642          */
 643         pmem_shift = BITS_PER_INT-11;
 644         pmem_scale = UPSCALE*(1U<<(BITS_PER_INT-11)) / total_memory;
 645         /* s->vsz is in kb. we want (s->vsz * pmem_scale) to never overflow */
 646         while (pmem_scale >= 512) {
 647                 pmem_scale /= 4;
 648                 pmem_shift -= 2;
 649         }
 650         pmem_half = (1U << pmem_shift) / (ENABLE_FEATURE_TOP_DECIMALS ? 20 : 2);
 651 #if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
 652         busy_jifs = cur_jif.busy - prev_jif.busy;
 653         /* This happens if there were lots of short-lived processes
 654          * between two top updates (e.g. compilation) */
 655         if (total_pcpu < busy_jifs) total_pcpu = busy_jifs;
 656
 657         /*
 658          * CPU% = s->pcpu/sum(s->pcpu) * busy_cpu_ticks/total_cpu_ticks
 659          * (pcpu is delta of sys+user time between samples)
 660          */
 661         /* (cur_jif.xxx - prev_jif.xxx) and s->pcpu are
 662          * in 0..~64000 range (HZ*update_interval).
 663          * we assume that unsigned is at least 32-bit.
 664          */
 665         pcpu_shift = 6;
 666         pcpu_scale = UPSCALE*64 * (uint16_t)busy_jifs;
 667         if (pcpu_scale == 0)
 668                 pcpu_scale = 1;
 669         while (pcpu_scale < (1U << (BITS_PER_INT-2))) {
 670                 pcpu_scale *= 4;
 671                 pcpu_shift += 2;
 672         }
 673         tmp_unsigned = (uint16_t)(cur_jif.total - prev_jif.total) * total_pcpu;
 674         if (tmp_unsigned != 0)
 675                 pcpu_scale /= tmp_unsigned;
 676         /* we want (s->pcpu * pcpu_scale) to never overflow */
 677         while (pcpu_scale >= 1024) {
 678                 pcpu_scale /= 4;
 679                 pcpu_shift -= 2;
 680         }
 681         pcpu_half = (1U << pcpu_shift) / (ENABLE_FEATURE_TOP_DECIMALS ? 20 : 2);
 682         /* printf(" pmem_scale=%u pcpu_scale=%u ", pmem_scale, pcpu_scale); */
 683 #endif
 684
 685         /* Ok, all preliminary data is ready, go through the list */
 686         scr_width += 2; /* account for leading '\n' and trailing NUL */
 687         if (lines_rem > ntop - G_scroll_ofs)
 688                 lines_rem = ntop - G_scroll_ofs;
 689         s = top + G_scroll_ofs;
 690         while (--lines_rem >= 0) {
 691                 unsigned col;
 692                 CALC_STAT(pmem, (s->vsz*pmem_scale + pmem_half) >> pmem_shift);
 693 #if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
 694                 CALC_STAT(pcpu, (s->pcpu*pcpu_scale + pcpu_half) >> pcpu_shift);
 695 #endif
 696
 697                 if (s->vsz >= 100000)
 698                         sprintf(vsz_str_buf, "%6ldm", s->vsz/1024);
 699                 else
 700                         sprintf(vsz_str_buf, "%7lu", s->vsz);
 701                 /* PID PPID USER STAT VSZ %VSZ [%CPU] COMMAND */
 702                 col = snprintf(line_buf, scr_width,
 703                                 "\n" "%5u%6u %-8.8s %s%s" FMT
 704                                 IF_FEATURE_TOP_SMP_PROCESS(" %3d")
 705                                 IF_FEATURE_TOP_CPU_USAGE_PERCENTAGE(FMT)
 706                                 " ",
 707                                 s->pid, s->ppid, get_cached_username(s->uid),
 708                                 s->state, vsz_str_buf,
 709                                 SHOW_STAT(pmem)
 710                                 IF_FEATURE_TOP_SMP_PROCESS(, s->last_seen_on_cpu)
 711                                 IF_FEATURE_TOP_CPU_USAGE_PERCENTAGE(, SHOW_STAT(pcpu))
 712                 );
 713                 if ((int)(col + 1) < scr_width)
 714                         read_cmdline(line_buf + col, scr_width - col, s->pid, s->comm);
 715                 fputs(line_buf, stdout);
 716                 /* printf(" %d/%d %lld/%lld", s->pcpu, total_pcpu,
 717                         cur_jif.busy - prev_jif.busy, cur_jif.total - prev_jif.total); */
 718                 s++;
 719         }
 720         /* printf(" %d", hist_iterations); */
 721         bb_putchar(OPT_BATCH_MODE ? '\n' : '\r');
 722         fflush_all();
 723 }
 724 #undef UPSCALE
 725 #undef SHOW_STAT
 726 #undef CALC_STAT
 727 #undef FMT
 728
 729 static void clearmems(void)
 730 {
 731         clear_username_cache();
 732         free(top);
 733         top = NULL;
 734 }
 735
 736 #if ENABLE_FEATURE_TOP_INTERACTIVE
 737 static void reset_term(void)
 738 {
 739         if (!OPT_BATCH_MODE)
 740                 tcsetattr_stdin_TCSANOW(&initial_settings);
 741 }
 742
 743 static void sig_catcher(int sig)
 744 {
 745         reset_term();
 746         kill_myself_with_sig(sig);
 747 }
 748 #endif /* FEATURE_TOP_INTERACTIVE */
 749
 750 /*
 751  * TOPMEM support
 752  */
 753
 754 typedef unsigned long mem_t;
 755
 756 typedef struct topmem_status_t {
 757         unsigned pid;
 758         char comm[COMM_LEN];
 759         /* vsz doesn't count /dev/xxx mappings except /dev/zero */
 760         mem_t vsz     ;
 761         mem_t vszrw   ;
 762         mem_t rss     ;
 763         mem_t rss_sh  ;
 764         mem_t dirty   ;
 765         mem_t dirty_sh;
 766         mem_t stack   ;
 767 } topmem_status_t;
 768
 769 enum { NUM_SORT_FIELD = 7 };
 770
 771 #define topmem ((topmem_status_t*)top)
 772
 773 #if ENABLE_FEATURE_TOPMEM
 774
 775 static int topmem_sort(char *a, char *b)
 776 {
 777         int n;
 778         mem_t l, r;
 779
 780         n = offsetof(topmem_status_t, vsz) + (sort_field * sizeof(mem_t));
 781         l = *(mem_t*)(a + n);
 782         r = *(mem_t*)(b + n);
 783         if (l == r) {
 784                 l = ((topmem_status_t*)a)->dirty;
 785                 r = ((topmem_status_t*)b)->dirty;
 786         }
 787         /* We want to avoid unsigned->signed and truncation errors */
 788         /* l>r: -1, l=r: 0, l<r: 1 */
 789         n = (l > r) ? -1 : (l != r);
 790         return inverted ? -n : n;
 791 }
 792
 793 /* display header info (meminfo / loadavg) */
 794 static void display_topmem_header(int scr_width, int *lines_rem_p)
 795 {
 796         unsigned long meminfo[MI_MAX];
 797
 798         parse_meminfo(meminfo);
 799
 800         snprintf(line_buf, LINE_BUF_SIZE,
 801                 "Mem total:%lu anon:%lu map:%lu free:%lu",
 802                 meminfo[MI_MEMTOTAL],
 803                 meminfo[MI_ANONPAGES],
 804                 meminfo[MI_MAPPED],
 805                 meminfo[MI_MEMFREE]);
 806         printf(OPT_BATCH_MODE ? "%.*s\n" : "\033[H\033[J%.*s\n", scr_width, line_buf);
 807
 808         snprintf(line_buf, LINE_BUF_SIZE,
 809                 " slab:%lu buf:%lu cache:%lu dirty:%lu write:%lu",
 810                 meminfo[MI_SLAB],
 811                 meminfo[MI_BUFFERS],
 812                 meminfo[MI_CACHED],
 813                 meminfo[MI_DIRTY],
 814                 meminfo[MI_WRITEBACK]);
 815         printf("%.*s\n", scr_width, line_buf);
 816
 817         snprintf(line_buf, LINE_BUF_SIZE,
 818                 "Swap total:%lu free:%lu", // TODO: % used?
 819                 meminfo[MI_SWAPTOTAL],
 820                 meminfo[MI_SWAPFREE]);
 821         printf("%.*s\n", scr_width, line_buf);
 822
 823         (*lines_rem_p) -= 3;
 824 }
 825
 826 static void ulltoa6_and_space(unsigned long long ul, char buf[6])
 827 {
 828         /* see http://en.wikipedia.org/wiki/Tera */
 829         smart_ulltoa5(ul, buf, " mgtpezy")[0] = ' ';
 830 }
 831
 832 static NOINLINE void display_topmem_process_list(int lines_rem, int scr_width)
 833 {
 834 #define HDR_STR "  PID   VSZ VSZRW   RSS (SHR) DIRTY (SHR) STACK"
 835 #define MIN_WIDTH sizeof(HDR_STR)
 836         const topmem_status_t *s = topmem + G_scroll_ofs;
 837         char *cp, ch;
 838
 839         display_topmem_header(scr_width, &lines_rem);
 840
 841         strcpy(line_buf, HDR_STR " COMMAND");
 842         /* Mark the ^FIELD^ we sort by */
 843         cp = &line_buf[5 + sort_field * 6];
 844         ch = "^_"[inverted];
 845         cp[6] = ch;
 846         do *cp++ = ch; while (*cp == ' ');
 847
 848         printf(OPT_BATCH_MODE ? "%.*s" : "\e[7m%.*s\e[0m", scr_width, line_buf);
 849         lines_rem--;
 850
 851         if (lines_rem > ntop - G_scroll_ofs)
 852                 lines_rem = ntop - G_scroll_ofs;
 853         while (--lines_rem >= 0) {
 854                 /* PID VSZ VSZRW RSS (SHR) DIRTY (SHR) COMMAND */
 855                 ulltoa6_and_space(s->pid     , &line_buf[0*6]);
 856                 ulltoa6_and_space(s->vsz     , &line_buf[1*6]);
 857                 ulltoa6_and_space(s->vszrw   , &line_buf[2*6]);
 858                 ulltoa6_and_space(s->rss     , &line_buf[3*6]);
 859                 ulltoa6_and_space(s->rss_sh  , &line_buf[4*6]);
 860                 ulltoa6_and_space(s->dirty   , &line_buf[5*6]);
 861                 ulltoa6_and_space(s->dirty_sh, &line_buf[6*6]);
 862                 ulltoa6_and_space(s->stack   , &line_buf[7*6]);
 863                 line_buf[8*6] = '\0';
 864                 if (scr_width > (int)MIN_WIDTH) {
 865                         read_cmdline(&line_buf[8*6], scr_width - MIN_WIDTH, s->pid, s->comm);
 866                 }
 867                 printf("\n""%.*s", scr_width, line_buf);
 868                 s++;
 869         }
 870         bb_putchar(OPT_BATCH_MODE ? '\n' : '\r');
 871         fflush_all();
 872 #undef HDR_STR
 873 #undef MIN_WIDTH
 874 }
 875
 876 #else
 877 void display_topmem_process_list(int lines_rem, int scr_width);
 878 int topmem_sort(char *a, char *b);
 879 #endif /* TOPMEM */
 880
 881 /*
 882  * end TOPMEM support
 883  */
 884
 885 enum {
 886         TOP_MASK = 0
 887                 | PSSCAN_PID
 888                 | PSSCAN_PPID
 889                 | PSSCAN_VSZ
 890                 | PSSCAN_STIME
 891                 | PSSCAN_UTIME
 892                 | PSSCAN_STATE
 893                 | PSSCAN_COMM
 894                 | PSSCAN_CPU
 895                 | PSSCAN_UIDGID,
 896         TOPMEM_MASK = 0
 897                 | PSSCAN_PID
 898                 | PSSCAN_SMAPS
 899                 | PSSCAN_COMM,
 900         EXIT_MASK = (unsigned)-1,
 901 };
 902
 903 #if ENABLE_FEATURE_TOP_INTERACTIVE
 904 static unsigned handle_input(unsigned scan_mask, unsigned interval)
 905 {
 906         if (option_mask32 & OPT_EOF) {
 907                 /* EOF on stdin ("top </dev/null") */
 908                 sleep(interval);
 909                 return scan_mask;
 910         }
 911
 912         while (1) {
 913                 int32_t c;
 914
 915                 c = read_key(STDIN_FILENO, G.kbd_input, interval * 1000);
 916                 if (c == -1 && errno != EAGAIN) {
 917                         /* error/EOF */
 918                         option_mask32 |= OPT_EOF;
 919                         break;
 920                 }
 921                 interval = 0;
 922
 923                 if (c == initial_settings.c_cc[VINTR])
 924                         return EXIT_MASK;
 925                 if (c == initial_settings.c_cc[VEOF])
 926                         return EXIT_MASK;
 927
 928                 if (c == KEYCODE_UP) {
 929                         G_scroll_ofs--;
 930                         goto normalize_ofs;
 931                 }
 932                 if (c == KEYCODE_DOWN) {
 933                         G_scroll_ofs++;
 934                         goto normalize_ofs;
 935                 }
 936                 if (c == KEYCODE_HOME) {
 937                         G_scroll_ofs = 0;
 938                         break;
 939                 }
 940                 if (c == KEYCODE_END) {
 941                         G_scroll_ofs = ntop - G.lines / 2;
 942                         goto normalize_ofs;
 943                 }
 944                 if (c == KEYCODE_PAGEUP) {
 945                         G_scroll_ofs -= G.lines / 2;
 946                         goto normalize_ofs;
 947                 }
 948                 if (c == KEYCODE_PAGEDOWN) {
 949                         G_scroll_ofs += G.lines / 2;
 950  normalize_ofs:
 951                         if (G_scroll_ofs >= ntop)
 952                                 G_scroll_ofs = ntop - 1;
 953                         if (G_scroll_ofs < 0)
 954                                 G_scroll_ofs = 0;
 955                         break;
 956                 }
 957
 958                 c |= 0x20; /* lowercase */
 959                 if (c == 'q')
 960                         return EXIT_MASK;
 961
 962                 if (c == 'n') {
 963                         IF_FEATURE_TOPMEM(scan_mask = TOP_MASK;)
 964                         sort_function[0] = pid_sort;
 965                         continue;
 966                 }
 967                 if (c == 'm') {
 968                         IF_FEATURE_TOPMEM(scan_mask = TOP_MASK;)
 969                         sort_function[0] = mem_sort;
 970 # if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
 971                         sort_function[1] = pcpu_sort;
 972                         sort_function[2] = time_sort;
 973 # endif
 974                         continue;
 975                 }
 976 # if ENABLE_FEATURE_SHOW_THREADS
 977                 if (c == 'h'
 978                 IF_FEATURE_TOPMEM(&& scan_mask != TOPMEM_MASK)
 979                 ) {
 980                         scan_mask ^= PSSCAN_TASKS;
 981                         continue;
 982                 }
 983 # endif
 984 # if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
 985                 if (c == 'p') {
 986                         IF_FEATURE_TOPMEM(scan_mask = TOP_MASK;)
 987                         sort_function[0] = pcpu_sort;
 988                         sort_function[1] = mem_sort;
 989                         sort_function[2] = time_sort;
 990                         continue;
 991                 }
 992                 if (c == 't') {
 993                         IF_FEATURE_TOPMEM(scan_mask = TOP_MASK;)
 994                         sort_function[0] = time_sort;
 995                         sort_function[1] = mem_sort;
 996                         sort_function[2] = pcpu_sort;
 997                         continue;
 998                 }
 999 #  if ENABLE_FEATURE_TOPMEM
1000                 if (c == 's') {
1001                         scan_mask = TOPMEM_MASK;
1002                         free(prev_hist);
1003                         prev_hist = NULL;
1004                         prev_hist_count = 0;
1005                         sort_field = (sort_field + 1) % NUM_SORT_FIELD;
1006                         continue;
1007                 }
1008 #  endif
1009                 if (c == 'r') {
1010                         inverted ^= 1;
1011                         continue;
1012                 }
1013 #  if ENABLE_FEATURE_TOP_SMP_CPU
1014                 /* procps-2.0.18 uses 'C', 3.2.7 uses '1' */
1015                 if (c == 'c' || c == '1') {
1016                         /* User wants to toggle per cpu <> aggregate */
1017                         if (smp_cpu_info) {
1018                                 free(cpu_prev_jif);
1019                                 free(cpu_jif);
1020                                 cpu_jif = &cur_jif;
1021                                 cpu_prev_jif = &prev_jif;
1022                         } else {
1023                                 /* Prepare for xrealloc() */
1024                                 cpu_jif = cpu_prev_jif = NULL;
1025                         }
1026                         num_cpus = 0;
1027                         smp_cpu_info = !smp_cpu_info;
1028                         get_jiffy_counts();
1029                         continue;
1030                 }
1031 #  endif
1032 # endif
1033                 break; /* unknown key -> force refresh */
1034         }
1035
1036         return scan_mask;
1037 }
1038 #endif
1039
1040 //usage:#if ENABLE_FEATURE_SHOW_THREADS || ENABLE_FEATURE_TOP_SMP_CPU
1041 //usage:# define IF_SHOW_THREADS_OR_TOP_SMP(...) __VA_ARGS__
1042 //usage:#else
1043 //usage:# define IF_SHOW_THREADS_OR_TOP_SMP(...)
1044 //usage:#endif
1045 //usage:#define top_trivial_usage
1046 //usage:       "[-b] [-nCOUNT] [-dSECONDS]" IF_FEATURE_TOPMEM(" [-m]")
1047 //usage:#define top_full_usage "\n\n"
1048 //usage:       "Provide a view of process activity in real time."
1049 //usage:   "\n""Read the status of all processes from /proc each SECONDS"
1050 //usage:   "\n""and display a screenful of them."
1051 //usage:   "\n"
1052 //usage:        IF_FEATURE_TOP_INTERACTIVE(
1053 //usage:       "Keys:"
1054 //usage:   "\n""        N/M"
1055 //usage:                IF_FEATURE_TOP_CPU_USAGE_PERCENTAGE("/P")
1056 //usage:                IF_FEATURE_TOP_CPU_USAGE_PERCENTAGE("/T")
1057 //usage:           ": " IF_FEATURE_TOPMEM("show CPU usage, ") "sort by pid/mem"
1058 //usage:                IF_FEATURE_TOP_CPU_USAGE_PERCENTAGE("/cpu")
1059 //usage:                IF_FEATURE_TOP_CPU_USAGE_PERCENTAGE("/time")
1060 //usage:        IF_FEATURE_TOPMEM(
1061 //usage:   "\n""        S: show memory"
1062 //usage:        )
1063 //usage:   "\n""        R: reverse sort"
1064 //usage:        IF_SHOW_THREADS_OR_TOP_SMP(
1065 //usage:   "\n""        "
1066 //usage:                IF_FEATURE_SHOW_THREADS("H: toggle threads")
1067 //usage:                IF_FEATURE_SHOW_THREADS(IF_FEATURE_TOP_SMP_CPU(", "))
1068 //usage:                IF_FEATURE_TOP_SMP_CPU("1: toggle SMP")
1069 //usage:        )
1070 //usage:   "\n""        Q,^C: exit"
1071 //usage:   "\n"
1072 //usage:   "\n""Options:"
1073 //usage:        )
1074 //usage:   "\n""        -b      Batch mode"
1075 //usage:   "\n""        -n N    Exit after N iterations"
1076 //usage:   "\n""        -d N    Delay between updates"
1077 //usage:        IF_FEATURE_TOPMEM(
1078 //usage:   "\n""        -m      Same as 's' key"
1079 //usage:        )
1080
1081 /* Interactive testing:
1082  * echo sss | ./busybox top
1083  * - shows memory screen
1084  * echo sss | ./busybox top -bn1 >mem
1085  * - saves memory screen - the *whole* list, not first NROWS processes!
1086  * echo .m.s.s.s.s.s.s.q | ./busybox top -b >z
1087  * - saves several different screens, and exits
1088  *
1089  * TODO: -i STRING param as a better alternative?
1090  */
1091
1092 int top_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
1093 int top_main(int argc UNUSED_PARAM, char **argv)
1094 {
1095         int iterations;
1096         unsigned col;
1097         unsigned interval;
1098         char *str_interval, *str_iterations;
1099         unsigned scan_mask = TOP_MASK;
1100
1101         INIT_G();
1102
1103         interval = 5; /* default update interval is 5 seconds */
1104         iterations = 0; /* infinite */
1105 #if ENABLE_FEATURE_TOP_SMP_CPU
1106         /*num_cpus = 0;*/
1107         /*smp_cpu_info = 0;*/  /* to start with show aggregate */
1108         cpu_jif = &cur_jif;
1109         cpu_prev_jif = &prev_jif;
1110 #endif
1111
1112         /* all args are options; -n NUM */
1113         opt_complementary = "-"; /* options can be specified w/o dash */
1114         col = getopt32(argv, "d:n:b"IF_FEATURE_TOPMEM("m"), &str_interval, &str_iterations);
1115 #if ENABLE_FEATURE_TOPMEM
1116         if (col & OPT_m) /* -m (busybox specific) */
1117                 scan_mask = TOPMEM_MASK;
1118 #endif
1119         if (col & OPT_d) {
1120                 /* work around for "-d 1" -> "-d -1" done by getopt32
1121                  * (opt_complementary == "-" does this) */
1122                 if (str_interval[0] == '-')
1123                         str_interval++;
1124                 /* Need to limit it to not overflow poll timeout */
1125                 interval = xatou16(str_interval);
1126         }
1127         if (col & OPT_n) {
1128                 if (str_iterations[0] == '-')
1129                         str_iterations++;
1130                 iterations = xatou(str_iterations);
1131         }
1132
1133         /* change to /proc */
1134         xchdir("/proc");
1135
1136 #if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
1137         sort_function[0] = pcpu_sort;
1138         sort_function[1] = mem_sort;
1139         sort_function[2] = time_sort;
1140 #else
1141         sort_function[0] = mem_sort;
1142 #endif
1143
1144         if (OPT_BATCH_MODE) {
1145                 option_mask32 |= OPT_EOF;
1146         }
1147 #if ENABLE_FEATURE_TOP_INTERACTIVE
1148         else {
1149                 /* Turn on unbuffered input; turn off echoing, ^C ^Z etc */
1150                 set_termios_to_raw(STDIN_FILENO, &initial_settings, TERMIOS_CLEAR_ISIG);
1151         }
1152
1153         bb_signals(BB_FATAL_SIGS, sig_catcher);
1154
1155         /* Eat initial input, if any */
1156         scan_mask = handle_input(scan_mask, 0);
1157 #endif
1158
1159         while (scan_mask != EXIT_MASK) {
1160                 procps_status_t *p = NULL;
1161
1162                 if (OPT_BATCH_MODE) {
1163                         G.lines = INT_MAX;
1164                         col = LINE_BUF_SIZE - 2; /* +2 bytes for '\n', NUL */
1165                 } else {
1166                         G.lines = 24; /* default */
1167                         col = 79;
1168                         /* We output to stdout, we need size of stdout (not stdin)! */
1169                         get_terminal_width_height(STDOUT_FILENO, &col, &G.lines);
1170                         if (G.lines < 5 || col < 10) {
1171                                 sleep(interval);
1172                                 continue;
1173                         }
1174                         if (col > LINE_BUF_SIZE - 2)
1175                                 col = LINE_BUF_SIZE - 2;
1176                 }
1177
1178                 /* read process IDs & status for all the processes */
1179                 ntop = 0;
1180                 while ((p = procps_scan(p, scan_mask)) != NULL) {
1181                         int n;
1182
1183                         IF_FEATURE_TOPMEM(if (scan_mask != TOPMEM_MASK)) {
1184                                 n = ntop;
1185                                 top = xrealloc_vector(top, 6, ntop++);
1186                                 top[n].pid = p->pid;
1187                                 top[n].ppid = p->ppid;
1188                                 top[n].vsz = p->vsz;
1189 #if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
1190                                 top[n].ticks = p->stime + p->utime;
1191 #endif
1192                                 top[n].uid = p->uid;
1193                                 strcpy(top[n].state, p->state);
1194                                 strcpy(top[n].comm, p->comm);
1195 #if ENABLE_FEATURE_TOP_SMP_PROCESS
1196                                 top[n].last_seen_on_cpu = p->last_seen_on_cpu;
1197 #endif
1198                         }
1199 #if ENABLE_FEATURE_TOPMEM
1200                         else { /* TOPMEM */
1201                                 if (!(p->smaps.mapped_ro | p->smaps.mapped_rw))
1202                                         continue; /* kernel threads are ignored */
1203                                 n = ntop;
1204                                 /* No bug here - top and topmem are the same */
1205                                 top = xrealloc_vector(topmem, 6, ntop++);
1206                                 strcpy(topmem[n].comm, p->comm);
1207                                 topmem[n].pid      = p->pid;
1208                                 topmem[n].vsz      = p->smaps.mapped_rw + p->smaps.mapped_ro;
1209                                 topmem[n].vszrw    = p->smaps.mapped_rw;
1210                                 topmem[n].rss_sh   = p->smaps.shared_clean + p->smaps.shared_dirty;
1211                                 topmem[n].rss      = p->smaps.private_clean + p->smaps.private_dirty + topmem[n].rss_sh;
1212                                 topmem[n].dirty    = p->smaps.private_dirty + p->smaps.shared_dirty;
1213                                 topmem[n].dirty_sh = p->smaps.shared_dirty;
1214                                 topmem[n].stack    = p->smaps.stack;
1215                         }
1216 #endif
1217                 } /* end of "while we read /proc" */
1218                 if (ntop == 0) {
1219                         bb_error_msg("no process info in /proc");
1220                         break;
1221                 }
1222
1223                 IF_FEATURE_TOPMEM(if (scan_mask != TOPMEM_MASK)) {
1224 #if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
1225                         if (!prev_hist_count) {
1226                                 do_stats();
1227                                 usleep(100000);
1228                                 clearmems();
1229                                 continue;
1230                         }
1231                         do_stats();
1232                         /* TODO: we don't need to sort all 10000 processes, we need to find top 24! */
1233                         qsort(top, ntop, sizeof(top_status_t), (void*)mult_lvl_cmp);
1234 #else
1235                         qsort(top, ntop, sizeof(top_status_t), (void*)(sort_function[0]));
1236 #endif
1237                         display_process_list(G.lines, col);
1238                 }
1239 #if ENABLE_FEATURE_TOPMEM
1240                 else { /* TOPMEM */
1241                         qsort(topmem, ntop, sizeof(topmem_status_t), (void*)topmem_sort);
1242                         display_topmem_process_list(G.lines, col);
1243                 }
1244 #endif
1245                 clearmems();
1246                 if (iterations >= 0 && !--iterations)
1247                         break;
1248 #if !ENABLE_FEATURE_TOP_INTERACTIVE
1249                 sleep(interval);
1250 #else
1251                 scan_mask = handle_input(scan_mask, interval);
1252 #endif
1253         } /* end of "while (not Q)" */
1254
1255         bb_putchar('\n');
1256 #if ENABLE_FEATURE_TOP_INTERACTIVE
1257         reset_term();
1258 #endif
1259         if (ENABLE_FEATURE_CLEAN_UP) {
1260                 clearmems();
1261 #if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
1262                 free(prev_hist);
1263 #endif
1264         }
1265         return EXIT_SUCCESS;
1266 }