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_m = (1 << 3),
 135         OPT_EOF = (1 << 4), /* pseudo: "we saw EOF in stdin" */
 136 };
 137 #define OPT_BATCH_MODE (option_mask32 & OPT_b)
 138
 139
 140 #if ENABLE_FEATURE_USE_TERMIOS
 141 static int pid_sort(top_status_t *P, top_status_t *Q)
 142 {
 143         /* Buggy wrt pids with high bit set */
 144         /* (linux pids are in [1..2^15-1]) */
 145         return (Q->pid - P->pid);
 146 }
 147 #endif
 148
 149 static int mem_sort(top_status_t *P, top_status_t *Q)
 150 {
 151         /* We want to avoid unsigned->signed and truncation errors */
 152         if (Q->vsz < P->vsz) return -1;
 153         return Q->vsz != P->vsz; /* 0 if ==, 1 if > */
 154 }
 155
 156
 157 #if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
 158
 159 static int pcpu_sort(top_status_t *P, top_status_t *Q)
 160 {
 161         /* Buggy wrt ticks with high bit set */
 162         /* Affects only processes for which ticks overflow */
 163         return (int)Q->pcpu - (int)P->pcpu;
 164 }
 165
 166 static int time_sort(top_status_t *P, top_status_t *Q)
 167 {
 168         /* We want to avoid unsigned->signed and truncation errors */
 169         if (Q->ticks < P->ticks) return -1;
 170         return Q->ticks != P->ticks; /* 0 if ==, 1 if > */
 171 }
 172
 173 static int mult_lvl_cmp(void* a, void* b)
 174 {
 175         int i, cmp_val;
 176
 177         for (i = 0; i < SORT_DEPTH; i++) {
 178                 cmp_val = (*sort_function[i])(a, b);
 179                 if (cmp_val != 0)
 180                         return cmp_val;
 181         }
 182         return 0;
 183 }
 184
 185 static NOINLINE int read_cpu_jiffy(FILE *fp, jiffy_counts_t *p_jif)
 186 {
 187 #if !ENABLE_FEATURE_TOP_SMP_CPU
 188         static const char fmt[] = "cpu %llu %llu %llu %llu %llu %llu %llu %llu";
 189 #else
 190         static const char fmt[] = "cp%*s %llu %llu %llu %llu %llu %llu %llu %llu";
 191 #endif
 192         int ret;
 193
 194         if (!fgets(line_buf, LINE_BUF_SIZE, fp) || line_buf[0] != 'c' /* not "cpu" */)
 195                 return 0;
 196         ret = sscanf(line_buf, fmt,
 197                         &p_jif->usr, &p_jif->nic, &p_jif->sys, &p_jif->idle,
 198                         &p_jif->iowait, &p_jif->irq, &p_jif->softirq,
 199                         &p_jif->steal);
 200         if (ret >= 4) {
 201                 p_jif->total = p_jif->usr + p_jif->nic + p_jif->sys + p_jif->idle
 202                         + p_jif->iowait + p_jif->irq + p_jif->softirq + p_jif->steal;
 203                 /* procps 2.x does not count iowait as busy time */
 204                 p_jif->busy = p_jif->total - p_jif->idle - p_jif->iowait;
 205         }
 206
 207         return ret;
 208 }
 209
 210 static void get_jiffy_counts(void)
 211 {
 212         FILE* fp = xfopen_for_read("stat");
 213
 214         /* We need to parse cumulative counts even if SMP CPU display is on,
 215          * they are used to calculate per process CPU% */
 216         prev_jif = cur_jif;
 217         if (read_cpu_jiffy(fp, &cur_jif) < 4)
 218                 bb_error_msg_and_die("can't read /proc/stat");
 219
 220 #if !ENABLE_FEATURE_TOP_SMP_CPU
 221         fclose(fp);
 222         return;
 223 #else
 224         if (!smp_cpu_info) {
 225                 fclose(fp);
 226                 return;
 227         }
 228
 229         if (!num_cpus) {
 230                 /* First time here. How many CPUs?
 231                  * There will be at least 1 /proc/stat line with cpu%d
 232                  */
 233                 while (1) {
 234                         cpu_jif = xrealloc_vector(cpu_jif, 1, num_cpus);
 235                         if (read_cpu_jiffy(fp, &cpu_jif[num_cpus]) <= 4)
 236                                 break;
 237                         num_cpus++;
 238                 }
 239                 if (num_cpus == 0) /* /proc/stat with only "cpu ..." line?! */
 240                         smp_cpu_info = 0;
 241
 242                 cpu_prev_jif = xzalloc(sizeof(cpu_prev_jif[0]) * num_cpus);
 243
 244                 /* Otherwise the first per cpu display shows all 100% idles */
 245                 usleep(50000);
 246         } else { /* Non first time invocation */
 247                 jiffy_counts_t *tmp;
 248                 int i;
 249
 250                 /* First switch the sample pointers: no need to copy */
 251                 tmp = cpu_prev_jif;
 252                 cpu_prev_jif = cpu_jif;
 253                 cpu_jif = tmp;
 254
 255                 /* Get the new samples */
 256                 for (i = 0; i < num_cpus; i++)
 257                         read_cpu_jiffy(fp, &cpu_jif[i]);
 258         }
 259 #endif
 260         fclose(fp);
 261 }
 262
 263 static void do_stats(void)
 264 {
 265         top_status_t *cur;
 266         pid_t pid;
 267         int i, last_i, n;
 268         struct save_hist *new_hist;
 269
 270         get_jiffy_counts();
 271         total_pcpu = 0;
 272         /* total_vsz = 0; */
 273         new_hist = xmalloc(sizeof(new_hist[0]) * ntop);
 274         /*
 275          * Make a pass through the data to get stats.
 276          */
 277         /* hist_iterations = 0; */
 278         i = 0;
 279         for (n = 0; n < ntop; n++) {
 280                 cur = top + n;
 281
 282                 /*
 283                  * Calculate time in cur process.  Time is sum of user time
 284                  * and system time
 285                  */
 286                 pid = cur->pid;
 287                 new_hist[n].ticks = cur->ticks;
 288                 new_hist[n].pid = pid;
 289
 290                 /* find matching entry from previous pass */
 291                 cur->pcpu = 0;
 292                 /* do not start at index 0, continue at last used one
 293                  * (brought hist_iterations from ~14000 down to 172) */
 294                 last_i = i;
 295                 if (prev_hist_count) do {
 296                         if (prev_hist[i].pid == pid) {
 297                                 cur->pcpu = cur->ticks - prev_hist[i].ticks;
 298                                 total_pcpu += cur->pcpu;
 299                                 break;
 300                         }
 301                         i = (i+1) % prev_hist_count;
 302                         /* hist_iterations++; */
 303                 } while (i != last_i);
 304                 /* total_vsz += cur->vsz; */
 305         }
 306
 307         /*
 308          * Save cur frame's information.
 309          */
 310         free(prev_hist);
 311         prev_hist = new_hist;
 312         prev_hist_count = ntop;
 313 }
 314
 315 #endif /* FEATURE_TOP_CPU_USAGE_PERCENTAGE */
 316
 317 #if ENABLE_FEATURE_TOP_CPU_GLOBAL_PERCENTS && ENABLE_FEATURE_TOP_DECIMALS
 318 /* formats 7 char string (8 with terminating NUL) */
 319 static char *fmt_100percent_8(char pbuf[8], unsigned value, unsigned total)
 320 {
 321         unsigned t;
 322         if (value >= total) { /* 100% ? */
 323                 strcpy(pbuf, "  100% ");
 324                 return pbuf;
 325         }
 326         /* else generate " [N/space]N.N% " string */
 327         value = 1000 * value / total;
 328         t = value / 100;
 329         value = value % 100;
 330         pbuf[0] = ' ';
 331         pbuf[1] = t ? t + '0' : ' ';
 332         pbuf[2] = '0' + (value / 10);
 333         pbuf[3] = '.';
 334         pbuf[4] = '0' + (value % 10);
 335         pbuf[5] = '%';
 336         pbuf[6] = ' ';
 337         pbuf[7] = '\0';
 338         return pbuf;
 339 }
 340 #endif
 341
 342 #if ENABLE_FEATURE_TOP_CPU_GLOBAL_PERCENTS
 343 static void display_cpus(int scr_width, char *scrbuf, int *lines_rem_p)
 344 {
 345         /*
 346          * xxx% = (cur_jif.xxx - prev_jif.xxx) / (cur_jif.total - prev_jif.total) * 100%
 347          */
 348         unsigned total_diff;
 349         jiffy_counts_t *p_jif, *p_prev_jif;
 350         int i;
 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_TOTAL_DIFF do { \
 357         total_diff = (unsigned)(p_jif->total - p_prev_jif->total); \
 358         if (total_diff == 0) total_diff = 1; \
 359 } while (0)
 360
 361 # if ENABLE_FEATURE_TOP_DECIMALS
 362 #  define CALC_STAT(xxx) char xxx[8]
 363 #  define SHOW_STAT(xxx) fmt_100percent_8(xxx, (unsigned)(p_jif->xxx - p_prev_jif->xxx), total_diff)
 364 #  define FMT "%s"
 365 # else
 366 #  define CALC_STAT(xxx) unsigned xxx = 100 * (unsigned)(p_jif->xxx - p_prev_jif->xxx) / total_diff
 367 #  define SHOW_STAT(xxx) xxx
 368 #  define FMT "%4u%% "
 369 # endif
 370
 371 # if !ENABLE_FEATURE_TOP_SMP_CPU
 372         {
 373                 i = 1;
 374                 p_jif = &cur_jif;
 375                 p_prev_jif = &prev_jif;
 376 # else
 377         /* Loop thru CPU(s) */
 378         n_cpu_lines = smp_cpu_info ? num_cpus : 1;
 379         if (n_cpu_lines > *lines_rem_p)
 380                 n_cpu_lines = *lines_rem_p;
 381
 382         for (i = 0; i < n_cpu_lines; i++) {
 383                 p_jif = &cpu_jif[i];
 384                 p_prev_jif = &cpu_prev_jif[i];
 385 # endif
 386                 CALC_TOTAL_DIFF;
 387
 388                 { /* Need a block: CALC_STAT are declarations */
 389                         CALC_STAT(usr);
 390                         CALC_STAT(sys);
 391                         CALC_STAT(nic);
 392                         CALC_STAT(idle);
 393                         CALC_STAT(iowait);
 394                         CALC_STAT(irq);
 395                         CALC_STAT(softirq);
 396                         /*CALC_STAT(steal);*/
 397
 398                         snprintf(scrbuf, scr_width,
 399                                 /* Barely fits in 79 chars when in "decimals" mode. */
 400 # if ENABLE_FEATURE_TOP_SMP_CPU
 401                                 "CPU%s:"FMT"usr"FMT"sys"FMT"nic"FMT"idle"FMT"io"FMT"irq"FMT"sirq",
 402                                 (smp_cpu_info ? utoa(i) : ""),
 403 # else
 404                                 "CPU:"FMT"usr"FMT"sys"FMT"nic"FMT"idle"FMT"io"FMT"irq"FMT"sirq",
 405 # endif
 406                                 SHOW_STAT(usr), SHOW_STAT(sys), SHOW_STAT(nic), SHOW_STAT(idle),
 407                                 SHOW_STAT(iowait), SHOW_STAT(irq), SHOW_STAT(softirq)
 408                                 /*, SHOW_STAT(steal) - what is this 'steal' thing? */
 409                                 /* I doubt anyone wants to know it */
 410                         );
 411                         puts(scrbuf);
 412                 }
 413         }
 414 # undef SHOW_STAT
 415 # undef CALC_STAT
 416 # undef FMT
 417         *lines_rem_p -= i;
 418 }
 419 #else  /* !ENABLE_FEATURE_TOP_CPU_GLOBAL_PERCENTS */
 420 # define display_cpus(scr_width, scrbuf, lines_rem) ((void)0)
 421 #endif
 422
 423 static unsigned long display_header(int scr_width, int *lines_rem_p)
 424 {
 425         FILE *fp;
 426         char buf[80];
 427         char scrbuf[80];
 428         unsigned long total, used, mfree, shared, buffers, cached;
 429
 430         /* read memory info */
 431         fp = xfopen_for_read("meminfo");
 432
 433         /*
 434          * Old kernels (such as 2.4.x) had a nice summary of memory info that
 435          * we could parse, however this is gone entirely in 2.6. Try parsing
 436          * the old way first, and if that fails, parse each field manually.
 437          *
 438          * First, we read in the first line. Old kernels will have bogus
 439          * strings we don't care about, whereas new kernels will start right
 440          * out with MemTotal:
 441          *                              -- PFM.
 442          */
 443         if (fscanf(fp, "MemTotal: %lu %s\n", &total, buf) != 2) {
 444                 fgets(buf, sizeof(buf), fp);    /* skip first line */
 445
 446                 fscanf(fp, "Mem: %lu %lu %lu %lu %lu %lu",
 447                         &total, &used, &mfree, &shared, &buffers, &cached);
 448                 /* convert to kilobytes */
 449                 used /= 1024;
 450                 mfree /= 1024;
 451                 shared /= 1024;
 452                 buffers /= 1024;
 453                 cached /= 1024;
 454                 total /= 1024;
 455         } else {
 456                 /*
 457                  * Revert to manual parsing, which incidentally already has the
 458                  * sizes in kilobytes. This should be safe for both 2.4 and
 459                  * 2.6.
 460                  */
 461                 fscanf(fp, "MemFree: %lu %s\n", &mfree, buf);
 462
 463                 /*
 464                  * MemShared: is no longer present in 2.6. Report this as 0,
 465                  * to maintain consistent behavior with normal procps.
 466                  */
 467                 if (fscanf(fp, "MemShared: %lu %s\n", &shared, buf) != 2)
 468                         shared = 0;
 469
 470                 fscanf(fp, "Buffers: %lu %s\n", &buffers, buf);
 471                 fscanf(fp, "Cached: %lu %s\n", &cached, buf);
 472
 473                 used = total - mfree;
 474         }
 475         fclose(fp);
 476
 477         /* output memory info */
 478         if (scr_width > (int)sizeof(scrbuf))
 479                 scr_width = sizeof(scrbuf);
 480         snprintf(scrbuf, scr_width,
 481                 "Mem: %luK used, %luK free, %luK shrd, %luK buff, %luK cached",
 482                 used, mfree, shared, buffers, cached);
 483         /* clear screen & go to top */
 484         printf(OPT_BATCH_MODE ? "%s\n" : "\e[H\e[J%s\n", scrbuf);
 485         (*lines_rem_p)--;
 486
 487         /* Display CPU time split as percentage of total time
 488          * This displays either a cumulative line or one line per CPU
 489          */
 490         display_cpus(scr_width, scrbuf, lines_rem_p);
 491
 492         /* read load average as a string */
 493         buf[0] = '\0';
 494         open_read_close("loadavg", buf, sizeof(buf) - 1);
 495         buf[sizeof(buf) - 1] = '\n';
 496         *strchr(buf, '\n') = '\0';
 497         snprintf(scrbuf, scr_width, "Load average: %s", buf);
 498         puts(scrbuf);
 499         (*lines_rem_p)--;
 500
 501         return total;
 502 }
 503
 504 static NOINLINE void display_process_list(int lines_rem, int scr_width)
 505 {
 506         enum {
 507                 BITS_PER_INT = sizeof(int) * 8
 508         };
 509
 510         top_status_t *s;
 511         char vsz_str_buf[8];
 512         unsigned long total_memory = display_header(scr_width, &lines_rem); /* or use total_vsz? */
 513         /* xxx_shift and xxx_scale variables allow us to replace
 514          * expensive divides with multiply and shift */
 515         unsigned pmem_shift, pmem_scale, pmem_half;
 516 #if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
 517         unsigned tmp_unsigned;
 518         unsigned pcpu_shift, pcpu_scale, pcpu_half;
 519         unsigned busy_jifs;
 520 #endif
 521
 522         /* what info of the processes is shown */
 523         printf(OPT_BATCH_MODE ? "%.*s" : "\e[7m%.*s\e[0m", scr_width,
 524                 "  PID  PPID USER     STAT   VSZ %MEM"
 525                 IF_FEATURE_TOP_SMP_PROCESS(" CPU")
 526                 IF_FEATURE_TOP_CPU_USAGE_PERCENTAGE(" %CPU")
 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;
 568         if (pcpu_scale == 0)
 569                 pcpu_scale = 1;
 570         while (pcpu_scale < (1U << (BITS_PER_INT-2))) {
 571                 pcpu_scale *= 4;
 572                 pcpu_shift += 2;
 573         }
 574         tmp_unsigned = (uint16_t)(cur_jif.total - prev_jif.total) * total_pcpu;
 575         if (tmp_unsigned != 0)
 576                 pcpu_scale /= tmp_unsigned;
 577         /* we want (s->pcpu * pcpu_scale) to never overflow */
 578         while (pcpu_scale >= 1024) {
 579                 pcpu_scale /= 4;
 580                 pcpu_shift -= 2;
 581         }
 582         pcpu_half = (1U << pcpu_shift) / (ENABLE_FEATURE_TOP_DECIMALS? 20 : 2);
 583         /* printf(" pmem_scale=%u pcpu_scale=%u ", pmem_scale, pcpu_scale); */
 584 #endif
 585
 586         /* Ok, all preliminary data is ready, go through the list */
 587         scr_width += 2; /* account for leading '\n' and trailing NUL */
 588         if (lines_rem > ntop)
 589                 lines_rem = ntop;
 590         s = top;
 591         while (--lines_rem >= 0) {
 592                 unsigned col;
 593                 CALC_STAT(pmem, (s->vsz*pmem_scale + pmem_half) >> pmem_shift);
 594 #if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
 595                 CALC_STAT(pcpu, (s->pcpu*pcpu_scale + pcpu_half) >> pcpu_shift);
 596 #endif
 597
 598                 if (s->vsz >= 100000)
 599                         sprintf(vsz_str_buf, "%6ldm", s->vsz/1024);
 600                 else
 601                         sprintf(vsz_str_buf, "%7ld", s->vsz);
 602                 /* PID PPID USER STAT VSZ %MEM [%CPU] COMMAND */
 603                 col = snprintf(line_buf, scr_width,
 604                                 "\n" "%5u%6u %-8.8s %s%s" FMT
 605                                 IF_FEATURE_TOP_SMP_PROCESS(" %3d")
 606                                 IF_FEATURE_TOP_CPU_USAGE_PERCENTAGE(FMT)
 607                                 " ",
 608                                 s->pid, s->ppid, get_cached_username(s->uid),
 609                                 s->state, vsz_str_buf,
 610                                 SHOW_STAT(pmem)
 611                                 IF_FEATURE_TOP_SMP_PROCESS(, s->last_seen_on_cpu)
 612                                 IF_FEATURE_TOP_CPU_USAGE_PERCENTAGE(, SHOW_STAT(pcpu))
 613                 );
 614                 if ((int)(col + 1) < scr_width)
 615                         read_cmdline(line_buf + col, scr_width - col, s->pid, s->comm);
 616                 fputs(line_buf, stdout);
 617                 /* printf(" %d/%d %lld/%lld", s->pcpu, total_pcpu,
 618                         cur_jif.busy - prev_jif.busy, cur_jif.total - prev_jif.total); */
 619                 s++;
 620         }
 621         /* printf(" %d", hist_iterations); */
 622         bb_putchar(OPT_BATCH_MODE ? '\n' : '\r');
 623         fflush_all();
 624 }
 625 #undef UPSCALE
 626 #undef SHOW_STAT
 627 #undef CALC_STAT
 628 #undef FMT
 629
 630 static void clearmems(void)
 631 {
 632         clear_username_cache();
 633         free(top);
 634         top = NULL;
 635         ntop = 0;
 636 }
 637
 638 #if ENABLE_FEATURE_USE_TERMIOS
 639
 640 static void reset_term(void)
 641 {
 642         tcsetattr_stdin_TCSANOW(&initial_settings);
 643         if (ENABLE_FEATURE_CLEAN_UP) {
 644                 clearmems();
 645 # if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
 646                 free(prev_hist);
 647 # endif
 648         }
 649 }
 650
 651 static void sig_catcher(int sig UNUSED_PARAM)
 652 {
 653         reset_term();
 654         exit(EXIT_FAILURE);
 655 }
 656 #endif /* FEATURE_USE_TERMIOS */
 657
 658 /*
 659  * TOPMEM support
 660  */
 661
 662 typedef unsigned long mem_t;
 663
 664 typedef struct topmem_status_t {
 665         unsigned pid;
 666         char comm[COMM_LEN];
 667         /* vsz doesn't count /dev/xxx mappings except /dev/zero */
 668         mem_t vsz     ;
 669         mem_t vszrw   ;
 670         mem_t rss     ;
 671         mem_t rss_sh  ;
 672         mem_t dirty   ;
 673         mem_t dirty_sh;
 674         mem_t stack   ;
 675 } topmem_status_t;
 676
 677 enum { NUM_SORT_FIELD = 7 };
 678
 679 #define topmem ((topmem_status_t*)top)
 680
 681 #if ENABLE_FEATURE_TOPMEM
 682
 683 static int topmem_sort(char *a, char *b)
 684 {
 685         int n;
 686         mem_t l, r;
 687
 688         n = offsetof(topmem_status_t, vsz) + (sort_field * sizeof(mem_t));
 689         l = *(mem_t*)(a + n);
 690         r = *(mem_t*)(b + n);
 691 //      if (l == r) {
 692 //              l = a->mapped_rw;
 693 //              r = b->mapped_rw;
 694 //      }
 695         /* We want to avoid unsigned->signed and truncation errors */
 696         /* l>r: -1, l=r: 0, l<r: 1 */
 697         n = (l > r) ? -1 : (l != r);
 698         return inverted ? -n : n;
 699 }
 700
 701 /* Cut "NNNN " out of "    NNNN kb" */
 702 static char *grab_number(char *str, const char *match, unsigned sz)
 703 {
 704         if (strncmp(str, match, sz) == 0) {
 705                 str = skip_whitespace(str + sz);
 706                 (skip_non_whitespace(str))[1] = '\0';
 707                 return xstrdup(str);
 708         }
 709         return NULL;
 710 }
 711
 712 /* display header info (meminfo / loadavg) */
 713 static void display_topmem_header(int scr_width, int *lines_rem_p)
 714 {
 715         char linebuf[128];
 716         unsigned i;
 717         FILE *fp;
 718         union {
 719                 struct {
 720                         /*  1 */ char *total;
 721                         /*  2 */ char *mfree;
 722                         /*  3 */ char *buf;
 723                         /*  4 */ char *cache;
 724                         /*  5 */ char *swaptotal;
 725                         /*  6 */ char *swapfree;
 726                         /*  7 */ char *dirty;
 727                         /*  8 */ char *mwrite;
 728                         /*  9 */ char *anon;
 729                         /* 10 */ char *map;
 730                         /* 11 */ char *slab;
 731                 } u;
 732                 char *str[11];
 733         } Z;
 734 #define total     Z.u.total
 735 #define mfree     Z.u.mfree
 736 #define buf       Z.u.buf
 737 #define cache     Z.u.cache
 738 #define swaptotal Z.u.swaptotal
 739 #define swapfree  Z.u.swapfree
 740 #define dirty     Z.u.dirty
 741 #define mwrite    Z.u.mwrite
 742 #define anon      Z.u.anon
 743 #define map       Z.u.map
 744 #define slab      Z.u.slab
 745 #define str       Z.str
 746
 747         memset(&Z, 0, sizeof(Z));
 748
 749         /* read memory info */
 750         fp = xfopen_for_read("meminfo");
 751         while (fgets(linebuf, sizeof(linebuf), fp)) {
 752                 char *p;
 753
 754 #define SCAN(match, name) \
 755                 p = grab_number(linebuf, match, sizeof(match)-1); \
 756                 if (p) { name = p; continue; }
 757
 758                 SCAN("MemTotal:", total);
 759                 SCAN("MemFree:", mfree);
 760                 SCAN("Buffers:", buf);
 761                 SCAN("Cached:", cache);
 762                 SCAN("SwapTotal:", swaptotal);
 763                 SCAN("SwapFree:", swapfree);
 764                 SCAN("Dirty:", dirty);
 765                 SCAN("Writeback:", mwrite);
 766                 SCAN("AnonPages:", anon);
 767                 SCAN("Mapped:", map);
 768                 SCAN("Slab:", slab);
 769 #undef SCAN
 770         }
 771         fclose(fp);
 772
 773 #define S(s) (s ? s : "0 ")
 774         snprintf(linebuf, sizeof(linebuf),
 775                 "Mem %stotal %sanon %smap %sfree",
 776                 S(total), S(anon), S(map), S(mfree));
 777         printf(OPT_BATCH_MODE ? "%.*s\n" : "\e[H\e[J%.*s\n", scr_width, linebuf);
 778
 779         snprintf(linebuf, sizeof(linebuf),
 780                 " %sslab %sbuf %scache %sdirty %swrite",
 781                 S(slab), S(buf), S(cache), S(dirty), S(mwrite));
 782         printf("%.*s\n", scr_width, linebuf);
 783
 784         snprintf(linebuf, sizeof(linebuf),
 785                 "Swap %stotal %sfree", // TODO: % used?
 786                 S(swaptotal), S(swapfree));
 787         printf("%.*s\n", scr_width, linebuf);
 788
 789         (*lines_rem_p) -= 3;
 790 #undef S
 791
 792         for (i = 0; i < ARRAY_SIZE(str); i++)
 793                 free(str[i]);
 794 #undef total
 795 #undef free
 796 #undef buf
 797 #undef cache
 798 #undef swaptotal
 799 #undef swapfree
 800 #undef dirty
 801 #undef write
 802 #undef anon
 803 #undef map
 804 #undef slab
 805 #undef str
 806 }
 807
 808 static void ulltoa6_and_space(unsigned long long ul, char buf[6])
 809 {
 810         /* see http://en.wikipedia.org/wiki/Tera */
 811         smart_ulltoa5(ul, buf, " mgtpezy");
 812         buf[5] = ' ';
 813 }
 814
 815 static NOINLINE void display_topmem_process_list(int lines_rem, int scr_width)
 816 {
 817 #define HDR_STR "  PID   VSZ VSZRW   RSS (SHR) DIRTY (SHR) STACK"
 818 #define MIN_WIDTH sizeof(HDR_STR)
 819         const topmem_status_t *s = topmem;
 820
 821         display_topmem_header(scr_width, &lines_rem);
 822         strcpy(line_buf, HDR_STR " COMMAND");
 823         line_buf[5 + sort_field * 6] = '*';
 824         printf(OPT_BATCH_MODE ? "%.*s" : "\e[7m%.*s\e[0m", scr_width, line_buf);
 825         lines_rem--;
 826
 827         if (lines_rem > ntop)
 828                 lines_rem = ntop;
 829         while (--lines_rem >= 0) {
 830                 /* PID VSZ VSZRW RSS (SHR) DIRTY (SHR) COMMAND */
 831                 ulltoa6_and_space(s->pid     , &line_buf[0*6]);
 832                 ulltoa6_and_space(s->vsz     , &line_buf[1*6]);
 833                 ulltoa6_and_space(s->vszrw   , &line_buf[2*6]);
 834                 ulltoa6_and_space(s->rss     , &line_buf[3*6]);
 835                 ulltoa6_and_space(s->rss_sh  , &line_buf[4*6]);
 836                 ulltoa6_and_space(s->dirty   , &line_buf[5*6]);
 837                 ulltoa6_and_space(s->dirty_sh, &line_buf[6*6]);
 838                 ulltoa6_and_space(s->stack   , &line_buf[7*6]);
 839                 line_buf[8*6] = '\0';
 840                 if (scr_width > (int)MIN_WIDTH) {
 841                         read_cmdline(&line_buf[8*6], scr_width - MIN_WIDTH, s->pid, s->comm);
 842                 }
 843                 printf("\n""%.*s", scr_width, line_buf);
 844                 s++;
 845         }
 846         bb_putchar(OPT_BATCH_MODE ? '\n' : '\r');
 847         fflush_all();
 848 #undef HDR_STR
 849 #undef MIN_WIDTH
 850 }
 851
 852 #else
 853 void display_topmem_process_list(int lines_rem, int scr_width);
 854 int topmem_sort(char *a, char *b);
 855 #endif /* TOPMEM */
 856
 857 /*
 858  * end TOPMEM support
 859  */
 860
 861 enum {
 862         TOP_MASK = 0
 863                 | PSSCAN_PID
 864                 | PSSCAN_PPID
 865                 | PSSCAN_VSZ
 866                 | PSSCAN_STIME
 867                 | PSSCAN_UTIME
 868                 | PSSCAN_STATE
 869                 | PSSCAN_COMM
 870                 | PSSCAN_CPU
 871                 | PSSCAN_UIDGID,
 872         TOPMEM_MASK = 0
 873                 | PSSCAN_PID
 874                 | PSSCAN_SMAPS
 875                 | PSSCAN_COMM,
 876 };
 877
 878 int top_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 879 int top_main(int argc UNUSED_PARAM, char **argv)
 880 {
 881         int iterations;
 882         unsigned lines, col;
 883         int lines_rem;
 884         unsigned interval;
 885         char *str_interval, *str_iterations;
 886         unsigned scan_mask = TOP_MASK;
 887 #if ENABLE_FEATURE_USE_TERMIOS
 888         struct termios new_settings;
 889         struct pollfd pfd[1];
 890         unsigned char c;
 891
 892         pfd[0].fd = 0;
 893         pfd[0].events = POLLIN;
 894 #endif
 895
 896         INIT_G();
 897
 898         interval = 5; /* default update interval is 5 seconds */
 899         iterations = 0; /* infinite */
 900 #if ENABLE_FEATURE_TOP_SMP_CPU
 901         /*num_cpus = 0;*/
 902         /*smp_cpu_info = 0;*/  /* to start with show aggregate */
 903         cpu_jif = &cur_jif;
 904         cpu_prev_jif = &prev_jif;
 905 #endif
 906
 907         /* all args are options; -n NUM */
 908         opt_complementary = "-"; /* options can be specified w/o dash */
 909         col = getopt32(argv, "d:n:b"IF_FEATURE_TOPMEM("m"), &str_interval, &str_iterations);
 910 #if ENABLE_FEATURE_TOPMEM
 911         if (col & OPT_m) /* -m (busybox specific) */
 912                 scan_mask = TOPMEM_MASK;
 913 #endif
 914         if (col & OPT_d) {
 915                 /* work around for "-d 1" -> "-d -1" done by getopt32
 916                  * (opt_complementary == "-" does this) */
 917                 if (str_interval[0] == '-')
 918                         str_interval++;
 919                 /* Need to limit it to not overflow poll timeout */
 920                 interval = xatou16(str_interval);
 921         }
 922         if (col & OPT_n) {
 923                 if (str_iterations[0] == '-')
 924                         str_iterations++;
 925                 iterations = xatou(str_iterations);
 926         }
 927
 928         /* change to /proc */
 929         xchdir("/proc");
 930 #if ENABLE_FEATURE_USE_TERMIOS
 931         tcgetattr(0, (void *) &initial_settings);
 932         memcpy(&new_settings, &initial_settings, sizeof(new_settings));
 933         /* unbuffered input, turn off echo */
 934         new_settings.c_lflag &= ~(ISIG | ICANON | ECHO | ECHONL);
 935
 936         bb_signals(BB_FATAL_SIGS, sig_catcher);
 937         tcsetattr_stdin_TCSANOW(&new_settings);
 938 #endif
 939
 940 #if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
 941         sort_function[0] = pcpu_sort;
 942         sort_function[1] = mem_sort;
 943         sort_function[2] = time_sort;
 944 #else
 945         sort_function[0] = mem_sort;
 946 #endif
 947
 948         while (1) {
 949                 procps_status_t *p = NULL;
 950
 951                 lines = 24; /* default */
 952                 col = 79;
 953 #if ENABLE_FEATURE_USE_TERMIOS
 954                 /* We output to stdout, we need size of stdout (not stdin)! */
 955                 get_terminal_width_height(STDOUT_FILENO, &col, &lines);
 956                 if (lines < 5 || col < 10) {
 957                         sleep(interval);
 958                         continue;
 959                 }
 960 #endif
 961                 if (col > LINE_BUF_SIZE-2) /* +2 bytes for '\n', NUL, */
 962                         col = LINE_BUF_SIZE-2;
 963
 964                 /* read process IDs & status for all the processes */
 965                 while ((p = procps_scan(p, scan_mask)) != NULL) {
 966                         int n;
 967 #if ENABLE_FEATURE_TOPMEM
 968                         if (scan_mask != TOPMEM_MASK)
 969 #endif
 970                         {
 971                                 n = ntop;
 972                                 top = xrealloc_vector(top, 6, ntop++);
 973                                 top[n].pid = p->pid;
 974                                 top[n].ppid = p->ppid;
 975                                 top[n].vsz = p->vsz;
 976 #if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
 977                                 top[n].ticks = p->stime + p->utime;
 978 #endif
 979                                 top[n].uid = p->uid;
 980                                 strcpy(top[n].state, p->state);
 981                                 strcpy(top[n].comm, p->comm);
 982 #if ENABLE_FEATURE_TOP_SMP_PROCESS
 983                                 top[n].last_seen_on_cpu = p->last_seen_on_cpu;
 984 #endif
 985                         }
 986 #if ENABLE_FEATURE_TOPMEM
 987                         else { /* TOPMEM */
 988                                 if (!(p->mapped_ro | p->mapped_rw))
 989                                         continue; /* kernel threads are ignored */
 990                                 n = ntop;
 991                                 /* No bug here - top and topmem are the same */
 992                                 top = xrealloc_vector(topmem, 6, ntop++);
 993                                 strcpy(topmem[n].comm, p->comm);
 994                                 topmem[n].pid      = p->pid;
 995                                 topmem[n].vsz      = p->mapped_rw + p->mapped_ro;
 996                                 topmem[n].vszrw    = p->mapped_rw;
 997                                 topmem[n].rss_sh   = p->shared_clean + p->shared_dirty;
 998                                 topmem[n].rss      = p->private_clean + p->private_dirty + topmem[n].rss_sh;
 999                                 topmem[n].dirty    = p->private_dirty + p->shared_dirty;
1000                                 topmem[n].dirty_sh = p->shared_dirty;
1001                                 topmem[n].stack    = p->stack;
1002                         }
1003 #endif
1004                 } /* end of "while we read /proc" */
1005                 if (ntop == 0) {
1006                         bb_error_msg("no process info in /proc");
1007                         break;
1008                 }
1009
1010                 if (scan_mask != TOPMEM_MASK) {
1011 #if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
1012                         if (!prev_hist_count) {
1013                                 do_stats();
1014                                 usleep(100000);
1015                                 clearmems();
1016                                 continue;
1017                         }
1018                         do_stats();
1019                         /* TODO: we don't need to sort all 10000 processes, we need to find top 24! */
1020                         qsort(top, ntop, sizeof(top_status_t), (void*)mult_lvl_cmp);
1021 #else
1022                         qsort(top, ntop, sizeof(top_status_t), (void*)(sort_function[0]));
1023 #endif
1024                 }
1025 #if ENABLE_FEATURE_TOPMEM
1026                 else { /* TOPMEM */
1027                         qsort(topmem, ntop, sizeof(topmem_status_t), (void*)topmem_sort);
1028                 }
1029 #endif
1030                 lines_rem = lines;
1031                 if (OPT_BATCH_MODE) {
1032                         lines_rem = INT_MAX;
1033                 }
1034                 if (scan_mask != TOPMEM_MASK)
1035                         display_process_list(lines_rem, col);
1036 #if ENABLE_FEATURE_TOPMEM
1037                 else
1038                         display_topmem_process_list(lines_rem, col);
1039 #endif
1040                 clearmems();
1041                 if (iterations >= 0 && !--iterations)
1042                         break;
1043 #if !ENABLE_FEATURE_USE_TERMIOS
1044                 sleep(interval);
1045 #else
1046                 if (option_mask32 & (OPT_b|OPT_EOF))
1047                          /* batch mode, or EOF on stdin ("top </dev/null") */
1048                         sleep(interval);
1049                 else if (safe_poll(pfd, 1, interval * 1000) > 0) {
1050                         if (safe_read(STDIN_FILENO, &c, 1) != 1) { /* error/EOF? */
1051                                 option_mask32 |= OPT_EOF;
1052                                 continue;
1053                         }
1054                         if (c == initial_settings.c_cc[VINTR])
1055                                 break;
1056                         c |= 0x20; /* lowercase */
1057                         if (c == 'q')
1058                                 break;
1059                         if (c == 'n') {
1060                                 IF_FEATURE_TOPMEM(scan_mask = TOP_MASK;)
1061                                 sort_function[0] = pid_sort;
1062                         }
1063                         if (c == 'm') {
1064                                 IF_FEATURE_TOPMEM(scan_mask = TOP_MASK;)
1065                                 sort_function[0] = mem_sort;
1066 # if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
1067                                 sort_function[1] = pcpu_sort;
1068                                 sort_function[2] = time_sort;
1069 # endif
1070                         }
1071 # if ENABLE_FEATURE_SHOW_THREADS
1072                         if (c == 'h'
1073                          IF_FEATURE_TOPMEM(&& scan_mask != TOPMEM_MASK)
1074                         ) {
1075                                 scan_mask ^= PSSCAN_TASKS;
1076                         }
1077 # endif
1078 # if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
1079                         if (c == 'p') {
1080                                 IF_FEATURE_TOPMEM(scan_mask = TOP_MASK;)
1081                                 sort_function[0] = pcpu_sort;
1082                                 sort_function[1] = mem_sort;
1083                                 sort_function[2] = time_sort;
1084                         }
1085                         if (c == 't') {
1086                                 IF_FEATURE_TOPMEM(scan_mask = TOP_MASK;)
1087                                 sort_function[0] = time_sort;
1088                                 sort_function[1] = mem_sort;
1089                                 sort_function[2] = pcpu_sort;
1090                         }
1091 #  if ENABLE_FEATURE_TOPMEM
1092                         if (c == 's') {
1093                                 scan_mask = TOPMEM_MASK;
1094                                 free(prev_hist);
1095                                 prev_hist = NULL;
1096                                 prev_hist_count = 0;
1097                                 sort_field = (sort_field + 1) % NUM_SORT_FIELD;
1098                         }
1099                         if (c == 'r')
1100                                 inverted ^= 1;
1101 #  endif
1102 #  if ENABLE_FEATURE_TOP_SMP_CPU
1103                         /* procps-2.0.18 uses 'C', 3.2.7 uses '1' */
1104                         if (c == 'c' || c == '1') {
1105                                 /* User wants to toggle per cpu <> aggregate */
1106                                 if (smp_cpu_info) {
1107                                         free(cpu_prev_jif);
1108                                         free(cpu_jif);
1109                                         cpu_jif = &cur_jif;
1110                                         cpu_prev_jif = &prev_jif;
1111                                 } else {
1112                                         /* Prepare for xrealloc() */
1113                                         cpu_jif = cpu_prev_jif = NULL;
1114                                 }
1115                                 num_cpus = 0;
1116                                 smp_cpu_info = !smp_cpu_info;
1117                                 get_jiffy_counts();
1118                         }
1119 #  endif
1120 # endif
1121                 }
1122 #endif /* FEATURE_USE_TERMIOS */
1123         } /* end of "while (1)" */
1124
1125         bb_putchar('\n');
1126 #if ENABLE_FEATURE_USE_TERMIOS
1127         reset_term();
1128 #endif
1129         return EXIT_SUCCESS;
1130 }