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