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_CPU_USAGE_PERCENTAGE
  60 //config:       bool "Show CPU per-process usage percentage"
  61 //config:       default y
  62 //config:       depends on TOP
  63 //config:       help
  64 //config:         Make top display CPU usage for each process.
  65 //config:         This adds about 2k.
  66 //config:
  67 //config:config FEATURE_TOP_CPU_GLOBAL_PERCENTS
  68 //config:       bool "Show CPU global usage percentage"
  69 //config:       default y
  70 //config:       depends on FEATURE_TOP_CPU_USAGE_PERCENTAGE
  71 //config:       help
  72 //config:         Makes top display "CPU: NN% usr NN% sys..." line.
  73 //config:         This adds about 0.5k.
  74 //config:
  75 //config:config FEATURE_TOP_SMP_CPU
  76 //config:       bool "SMP CPU usage display ('c' key)"
  77 //config:       default y
  78 //config:       depends on FEATURE_TOP_CPU_GLOBAL_PERCENTS
  79 //config:       help
  80 //config:         Allow 'c' key to switch between individual/cumulative CPU stats
  81 //config:         This adds about 0.5k.
  82 //config:
  83 //config:config FEATURE_TOP_DECIMALS
  84 //config:       bool "Show 1/10th of a percent in CPU/mem statistics"
  85 //config:       default y
  86 //config:       depends on FEATURE_TOP_CPU_USAGE_PERCENTAGE
  87 //config:       help
  88 //config:         Show 1/10th of a percent in CPU/mem statistics.
  89 //config:         This adds about 0.3k.
  90 //config:
  91 //config:config FEATURE_TOP_SMP_PROCESS
  92 //config:       bool "Show CPU process runs on ('j' field)"
  93 //config:       default y
  94 //config:       depends on TOP
  95 //config:       help
  96 //config:         Show CPU where process was last found running on.
  97 //config:         This is the 'j' field.
  98 //config:
  99 //config:config FEATURE_TOPMEM
 100 //config:       bool "Topmem command ('s' key)"
 101 //config:       default y
 102 //config:       depends on TOP
 103 //config:       help
 104 //config:         Enable 's' in top (gives lots of memory info).
 105
 106 //applet:IF_TOP(APPLET(top, BB_DIR_USR_BIN, BB_SUID_DROP))
 107
 108 //kbuild:lib-$(CONFIG_TOP) += top.o
 109
 110 #include "libbb.h"
 111 #include "common_bufsiz.h"
 112
 113
 114 typedef struct top_status_t {
 115         unsigned long vsz;
 116 #if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
 117         unsigned long ticks;
 118         unsigned pcpu; /* delta of ticks */
 119 #endif
 120         unsigned pid, ppid;
 121         unsigned uid;
 122         char state[4];
 123         char comm[COMM_LEN];
 124 #if ENABLE_FEATURE_TOP_SMP_PROCESS
 125         int last_seen_on_cpu;
 126 #endif
 127 } top_status_t;
 128
 129 typedef struct jiffy_counts_t {
 130         /* Linux 2.4.x has only first four */
 131         unsigned long long usr, nic, sys, idle;
 132         unsigned long long iowait, irq, softirq, steal;
 133         unsigned long long total;
 134         unsigned long long busy;
 135 } jiffy_counts_t;
 136
 137 /* This structure stores some critical information from one frame to
 138    the next. Used for finding deltas. */
 139 typedef struct save_hist {
 140         unsigned long ticks;
 141         pid_t pid;
 142 } save_hist;
 143
 144 typedef int (*cmp_funcp)(top_status_t *P, top_status_t *Q);
 145
 146
 147 enum { SORT_DEPTH = 3 };
 148
 149
 150 struct globals {
 151         top_status_t *top;
 152         int ntop;
 153         smallint inverted;
 154 #if ENABLE_FEATURE_TOPMEM
 155         smallint sort_field;
 156 #endif
 157 #if ENABLE_FEATURE_TOP_SMP_CPU
 158         smallint smp_cpu_info; /* one/many cpu info lines? */
 159 #endif
 160         unsigned lines;  /* screen height */
 161 #if ENABLE_FEATURE_USE_TERMIOS
 162         struct termios initial_settings;
 163         int scroll_ofs;
 164 #define G_scroll_ofs G.scroll_ofs
 165 #else
 166 #define G_scroll_ofs 0
 167 #endif
 168 #if !ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
 169         cmp_funcp sort_function[1];
 170 #else
 171         cmp_funcp sort_function[SORT_DEPTH];
 172         struct save_hist *prev_hist;
 173         int prev_hist_count;
 174         jiffy_counts_t cur_jif, prev_jif;
 175         /* int hist_iterations; */
 176         unsigned total_pcpu;
 177         /* unsigned long total_vsz; */
 178 #endif
 179 #if ENABLE_FEATURE_TOP_SMP_CPU
 180         /* Per CPU samples: current and last */
 181         jiffy_counts_t *cpu_jif, *cpu_prev_jif;
 182         int num_cpus;
 183 #endif
 184 #if ENABLE_FEATURE_USE_TERMIOS
 185         char kbd_input[KEYCODE_BUFFER_SIZE];
 186 #endif
 187         char line_buf[80];
 188 }; //FIX_ALIASING; - large code growth
 189 enum { LINE_BUF_SIZE = COMMON_BUFSIZE - offsetof(struct globals, line_buf) };
 190 #define G (*(struct globals*)bb_common_bufsiz1)
 191 #define top              (G.top               )
 192 #define ntop             (G.ntop              )
 193 #define sort_field       (G.sort_field        )
 194 #define inverted         (G.inverted          )
 195 #define smp_cpu_info     (G.smp_cpu_info      )
 196 #define initial_settings (G.initial_settings  )
 197 #define sort_function    (G.sort_function     )
 198 #define prev_hist        (G.prev_hist         )
 199 #define prev_hist_count  (G.prev_hist_count   )
 200 #define cur_jif          (G.cur_jif           )
 201 #define prev_jif         (G.prev_jif          )
 202 #define cpu_jif          (G.cpu_jif           )
 203 #define cpu_prev_jif     (G.cpu_prev_jif      )
 204 #define num_cpus         (G.num_cpus          )
 205 #define total_pcpu       (G.total_pcpu        )
 206 #define line_buf         (G.line_buf          )
 207 #define INIT_G() do { \
 208         setup_common_bufsiz(); \
 209         BUILD_BUG_ON(sizeof(G) > COMMON_BUFSIZE); \
 210         BUILD_BUG_ON(LINE_BUF_SIZE <= 80); \
 211 } while (0)
 212
 213 enum {
 214         OPT_d = (1 << 0),
 215         OPT_n = (1 << 1),
 216         OPT_b = (1 << 2),
 217         OPT_m = (1 << 3),
 218         OPT_EOF = (1 << 4), /* pseudo: "we saw EOF in stdin" */
 219 };
 220 #define OPT_BATCH_MODE (option_mask32 & OPT_b)
 221
 222
 223 #if ENABLE_FEATURE_USE_TERMIOS
 224 static int pid_sort(top_status_t *P, top_status_t *Q)
 225 {
 226         /* Buggy wrt pids with high bit set */
 227         /* (linux pids are in [1..2^15-1]) */
 228         return (Q->pid - P->pid);
 229 }
 230 #endif
 231
 232 static int mem_sort(top_status_t *P, top_status_t *Q)
 233 {
 234         /* We want to avoid unsigned->signed and truncation errors */
 235         if (Q->vsz < P->vsz) return -1;
 236         return Q->vsz != P->vsz; /* 0 if ==, 1 if > */
 237 }
 238
 239
 240 #if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
 241
 242 static int pcpu_sort(top_status_t *P, top_status_t *Q)
 243 {
 244         /* Buggy wrt ticks with high bit set */
 245         /* Affects only processes for which ticks overflow */
 246         return (int)Q->pcpu - (int)P->pcpu;
 247 }
 248
 249 static int time_sort(top_status_t *P, top_status_t *Q)
 250 {
 251         /* We want to avoid unsigned->signed and truncation errors */
 252         if (Q->ticks < P->ticks) return -1;
 253         return Q->ticks != P->ticks; /* 0 if ==, 1 if > */
 254 }
 255
 256 static int mult_lvl_cmp(void* a, void* b)
 257 {
 258         int i, cmp_val;
 259
 260         for (i = 0; i < SORT_DEPTH; i++) {
 261                 cmp_val = (*sort_function[i])(a, b);
 262                 if (cmp_val != 0)
 263                         break;
 264         }
 265         return inverted ? -cmp_val : cmp_val;
 266 }
 267
 268 static NOINLINE int read_cpu_jiffy(FILE *fp, jiffy_counts_t *p_jif)
 269 {
 270 #if !ENABLE_FEATURE_TOP_SMP_CPU
 271         static const char fmt[] ALIGN1 = "cpu %llu %llu %llu %llu %llu %llu %llu %llu";
 272 #else
 273         static const char fmt[] ALIGN1 = "cp%*s %llu %llu %llu %llu %llu %llu %llu %llu";
 274 #endif
 275         int ret;
 276
 277         if (!fgets(line_buf, LINE_BUF_SIZE, fp) || line_buf[0] != 'c' /* not "cpu" */)
 278                 return 0;
 279         ret = sscanf(line_buf, fmt,
 280                         &p_jif->usr, &p_jif->nic, &p_jif->sys, &p_jif->idle,
 281                         &p_jif->iowait, &p_jif->irq, &p_jif->softirq,
 282                         &p_jif->steal);
 283         if (ret >= 4) {
 284                 p_jif->total = p_jif->usr + p_jif->nic + p_jif->sys + p_jif->idle
 285                         + p_jif->iowait + p_jif->irq + p_jif->softirq + p_jif->steal;
 286                 /* procps 2.x does not count iowait as busy time */
 287                 p_jif->busy = p_jif->total - p_jif->idle - p_jif->iowait;
 288         }
 289
 290         return ret;
 291 }
 292
 293 static void get_jiffy_counts(void)
 294 {
 295         FILE* fp = xfopen_for_read("stat");
 296
 297         /* We need to parse cumulative counts even if SMP CPU display is on,
 298          * they are used to calculate per process CPU% */
 299         prev_jif = cur_jif;
 300         if (read_cpu_jiffy(fp, &cur_jif) < 4)
 301                 bb_error_msg_and_die("can't read '%s'", "/proc/stat");
 302
 303 #if !ENABLE_FEATURE_TOP_SMP_CPU
 304         fclose(fp);
 305         return;
 306 #else
 307         if (!smp_cpu_info) {
 308                 fclose(fp);
 309                 return;
 310         }
 311
 312         if (!num_cpus) {
 313                 /* First time here. How many CPUs?
 314                  * There will be at least 1 /proc/stat line with cpu%d
 315                  */
 316                 while (1) {
 317                         cpu_jif = xrealloc_vector(cpu_jif, 1, num_cpus);
 318                         if (read_cpu_jiffy(fp, &cpu_jif[num_cpus]) <= 4)
 319                                 break;
 320                         num_cpus++;
 321                 }
 322                 if (num_cpus == 0) /* /proc/stat with only "cpu ..." line?! */
 323                         smp_cpu_info = 0;
 324
 325                 cpu_prev_jif = xzalloc(sizeof(cpu_prev_jif[0]) * num_cpus);
 326
 327                 /* Otherwise the first per cpu display shows all 100% idles */
 328                 usleep(50000);
 329         } else { /* Non first time invocation */
 330                 jiffy_counts_t *tmp;
 331                 int i;
 332
 333                 /* First switch the sample pointers: no need to copy */
 334                 tmp = cpu_prev_jif;
 335                 cpu_prev_jif = cpu_jif;
 336                 cpu_jif = tmp;
 337
 338                 /* Get the new samples */
 339                 for (i = 0; i < num_cpus; i++)
 340                         read_cpu_jiffy(fp, &cpu_jif[i]);
 341         }
 342 #endif
 343         fclose(fp);
 344 }
 345
 346 static void do_stats(void)
 347 {
 348         top_status_t *cur;
 349         pid_t pid;
 350         int i, last_i, n;
 351         struct save_hist *new_hist;
 352
 353         get_jiffy_counts();
 354         total_pcpu = 0;
 355         /* total_vsz = 0; */
 356         new_hist = xmalloc(sizeof(new_hist[0]) * ntop);
 357         /*
 358          * Make a pass through the data to get stats.
 359          */
 360         /* hist_iterations = 0; */
 361         i = 0;
 362         for (n = 0; n < ntop; n++) {
 363                 cur = top + n;
 364
 365                 /*
 366                  * Calculate time in cur process.  Time is sum of user time
 367                  * and system time
 368                  */
 369                 pid = cur->pid;
 370                 new_hist[n].ticks = cur->ticks;
 371                 new_hist[n].pid = pid;
 372
 373                 /* find matching entry from previous pass */
 374                 cur->pcpu = 0;
 375                 /* do not start at index 0, continue at last used one
 376                  * (brought hist_iterations from ~14000 down to 172) */
 377                 last_i = i;
 378                 if (prev_hist_count) do {
 379                         if (prev_hist[i].pid == pid) {
 380                                 cur->pcpu = cur->ticks - prev_hist[i].ticks;
 381                                 total_pcpu += cur->pcpu;
 382                                 break;
 383                         }
 384                         i = (i+1) % prev_hist_count;
 385                         /* hist_iterations++; */
 386                 } while (i != last_i);
 387                 /* total_vsz += cur->vsz; */
 388         }
 389
 390         /*
 391          * Save cur frame's information.
 392          */
 393         free(prev_hist);
 394         prev_hist = new_hist;
 395         prev_hist_count = ntop;
 396 }
 397
 398 #endif /* FEATURE_TOP_CPU_USAGE_PERCENTAGE */
 399
 400 #if ENABLE_FEATURE_TOP_CPU_GLOBAL_PERCENTS && ENABLE_FEATURE_TOP_DECIMALS
 401 /* formats 7 char string (8 with terminating NUL) */
 402 static char *fmt_100percent_8(char pbuf[8], unsigned value, unsigned total)
 403 {
 404         unsigned t;
 405         if (value >= total) { /* 100% ? */
 406                 strcpy(pbuf, "  100% ");
 407                 return pbuf;
 408         }
 409         /* else generate " [N/space]N.N% " string */
 410         value = 1000 * value / total;
 411         t = value / 100;
 412         value = value % 100;
 413         pbuf[0] = ' ';
 414         pbuf[1] = t ? t + '0' : ' ';
 415         pbuf[2] = '0' + (value / 10);
 416         pbuf[3] = '.';
 417         pbuf[4] = '0' + (value % 10);
 418         pbuf[5] = '%';
 419         pbuf[6] = ' ';
 420         pbuf[7] = '\0';
 421         return pbuf;
 422 }
 423 #endif
 424
 425 #if ENABLE_FEATURE_TOP_CPU_GLOBAL_PERCENTS
 426 static void display_cpus(int scr_width, char *scrbuf, int *lines_rem_p)
 427 {
 428         /*
 429          * xxx% = (cur_jif.xxx - prev_jif.xxx) / (cur_jif.total - prev_jif.total) * 100%
 430          */
 431         unsigned total_diff;
 432         jiffy_counts_t *p_jif, *p_prev_jif;
 433         int i;
 434 # if ENABLE_FEATURE_TOP_SMP_CPU
 435         int n_cpu_lines;
 436 # endif
 437
 438         /* using (unsigned) casts to make operations cheaper */
 439 # define  CALC_TOTAL_DIFF do { \
 440         total_diff = (unsigned)(p_jif->total - p_prev_jif->total); \
 441         if (total_diff == 0) total_diff = 1; \
 442 } while (0)
 443
 444 # if ENABLE_FEATURE_TOP_DECIMALS
 445 #  define CALC_STAT(xxx) char xxx[8]
 446 #  define SHOW_STAT(xxx) fmt_100percent_8(xxx, (unsigned)(p_jif->xxx - p_prev_jif->xxx), total_diff)
 447 #  define FMT "%s"
 448 # else
 449 #  define CALC_STAT(xxx) unsigned xxx = 100 * (unsigned)(p_jif->xxx - p_prev_jif->xxx) / total_diff
 450 #  define SHOW_STAT(xxx) xxx
 451 #  define FMT "%4u%% "
 452 # endif
 453
 454 # if !ENABLE_FEATURE_TOP_SMP_CPU
 455         {
 456                 i = 1;
 457                 p_jif = &cur_jif;
 458                 p_prev_jif = &prev_jif;
 459 # else
 460         /* Loop thru CPU(s) */
 461         n_cpu_lines = smp_cpu_info ? num_cpus : 1;
 462         if (n_cpu_lines > *lines_rem_p)
 463                 n_cpu_lines = *lines_rem_p;
 464
 465         for (i = 0; i < n_cpu_lines; i++) {
 466                 p_jif = &cpu_jif[i];
 467                 p_prev_jif = &cpu_prev_jif[i];
 468 # endif
 469                 CALC_TOTAL_DIFF;
 470
 471                 { /* Need a block: CALC_STAT are declarations */
 472                         CALC_STAT(usr);
 473                         CALC_STAT(sys);
 474                         CALC_STAT(nic);
 475                         CALC_STAT(idle);
 476                         CALC_STAT(iowait);
 477                         CALC_STAT(irq);
 478                         CALC_STAT(softirq);
 479                         /*CALC_STAT(steal);*/
 480
 481                         snprintf(scrbuf, scr_width,
 482                                 /* Barely fits in 79 chars when in "decimals" mode. */
 483 # if ENABLE_FEATURE_TOP_SMP_CPU
 484                                 "CPU%s:"FMT"usr"FMT"sys"FMT"nic"FMT"idle"FMT"io"FMT"irq"FMT"sirq",
 485                                 (smp_cpu_info ? utoa(i) : ""),
 486 # else
 487                                 "CPU:"FMT"usr"FMT"sys"FMT"nic"FMT"idle"FMT"io"FMT"irq"FMT"sirq",
 488 # endif
 489                                 SHOW_STAT(usr), SHOW_STAT(sys), SHOW_STAT(nic), SHOW_STAT(idle),
 490                                 SHOW_STAT(iowait), SHOW_STAT(irq), SHOW_STAT(softirq)
 491                                 /*, SHOW_STAT(steal) - what is this 'steal' thing? */
 492                                 /* I doubt anyone wants to know it */
 493                         );
 494                         puts(scrbuf);
 495                 }
 496         }
 497 # undef SHOW_STAT
 498 # undef CALC_STAT
 499 # undef FMT
 500         *lines_rem_p -= i;
 501 }
 502 #else  /* !ENABLE_FEATURE_TOP_CPU_GLOBAL_PERCENTS */
 503 # define display_cpus(scr_width, scrbuf, lines_rem) ((void)0)
 504 #endif
 505
 506 enum {
 507         MI_MEMTOTAL,
 508         MI_MEMFREE,
 509         MI_MEMSHARED,
 510         MI_SHMEM,
 511         MI_BUFFERS,
 512         MI_CACHED,
 513         MI_SWAPTOTAL,
 514         MI_SWAPFREE,
 515         MI_DIRTY,
 516         MI_WRITEBACK,
 517         MI_ANONPAGES,
 518         MI_MAPPED,
 519         MI_SLAB,
 520         MI_MAX
 521 };
 522
 523 static void parse_meminfo(unsigned long meminfo[MI_MAX])
 524 {
 525         static const char fields[] ALIGN1 =
 526                 "MemTotal\0"
 527                 "MemFree\0"
 528                 "MemShared\0"
 529                 "Shmem\0"
 530                 "Buffers\0"
 531                 "Cached\0"
 532                 "SwapTotal\0"
 533                 "SwapFree\0"
 534                 "Dirty\0"
 535                 "Writeback\0"
 536                 "AnonPages\0"
 537                 "Mapped\0"
 538                 "Slab\0";
 539         char buf[60]; /* actual lines we expect are ~30 chars or less */
 540         FILE *f;
 541         int i;
 542
 543         memset(meminfo, 0, sizeof(meminfo[0]) * MI_MAX);
 544         f = xfopen_for_read("meminfo");
 545         while (fgets(buf, sizeof(buf), f) != NULL) {
 546                 char *c = strchr(buf, ':');
 547                 if (!c)
 548                         continue;
 549                 *c = '\0';
 550                 i = index_in_strings(fields, buf);
 551                 if (i >= 0)
 552                         meminfo[i] = strtoul(c+1, NULL, 10);
 553         }
 554         fclose(f);
 555 }
 556
 557 static unsigned long display_header(int scr_width, int *lines_rem_p)
 558 {
 559         char scrbuf[100]; /* [80] was a bit too low on 8Gb ram box */
 560         char *buf;
 561         unsigned long meminfo[MI_MAX];
 562
 563         parse_meminfo(meminfo);
 564
 565         /* Output memory info */
 566         if (scr_width > (int)sizeof(scrbuf))
 567                 scr_width = sizeof(scrbuf);
 568         snprintf(scrbuf, scr_width,
 569                 "Mem: %luK used, %luK free, %luK shrd, %luK buff, %luK cached",
 570                 meminfo[MI_MEMTOTAL] - meminfo[MI_MEMFREE],
 571                 meminfo[MI_MEMFREE],
 572                 meminfo[MI_MEMSHARED] + meminfo[MI_SHMEM],
 573                 meminfo[MI_BUFFERS],
 574                 meminfo[MI_CACHED]);
 575         /* Go to top & clear to the end of screen */
 576         printf(OPT_BATCH_MODE ? "%s\n" : "\033[H\033[J%s\n", scrbuf);
 577         (*lines_rem_p)--;
 578
 579         /* Display CPU time split as percentage of total time.
 580          * This displays either a cumulative line or one line per CPU.
 581          */
 582         display_cpus(scr_width, scrbuf, lines_rem_p);
 583
 584         /* Read load average as a string */
 585         buf = stpcpy(scrbuf, "Load average: ");
 586         open_read_close("loadavg", buf, sizeof(scrbuf) - sizeof("Load average: "));
 587         scrbuf[scr_width - 1] = '\0';
 588         strchrnul(buf, '\n')[0] = '\0';
 589         puts(scrbuf);
 590         (*lines_rem_p)--;
 591
 592         return meminfo[MI_MEMTOTAL];
 593 }
 594
 595 static NOINLINE void display_process_list(int lines_rem, int scr_width)
 596 {
 597         enum {
 598                 BITS_PER_INT = sizeof(int) * 8
 599         };
 600
 601         top_status_t *s;
 602         char vsz_str_buf[8];
 603         unsigned long total_memory = display_header(scr_width, &lines_rem); /* or use total_vsz? */
 604         /* xxx_shift and xxx_scale variables allow us to replace
 605          * expensive divides with multiply and shift */
 606         unsigned pmem_shift, pmem_scale, pmem_half;
 607 #if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
 608         unsigned tmp_unsigned;
 609         unsigned pcpu_shift, pcpu_scale, pcpu_half;
 610         unsigned busy_jifs;
 611 #endif
 612
 613         /* what info of the processes is shown */
 614         printf(OPT_BATCH_MODE ? "%.*s" : "\033[7m%.*s\033[0m", scr_width,
 615                 "  PID  PPID USER     STAT   VSZ %VSZ"
 616                 IF_FEATURE_TOP_SMP_PROCESS(" CPU")
 617                 IF_FEATURE_TOP_CPU_USAGE_PERCENTAGE(" %CPU")
 618                 " COMMAND");
 619         lines_rem--;
 620
 621 #if ENABLE_FEATURE_TOP_DECIMALS
 622 # define UPSCALE 1000
 623 # define CALC_STAT(name, val) div_t name = div((val), 10)
 624 # define SHOW_STAT(name) name.quot, '0'+name.rem
 625 # define FMT "%3u.%c"
 626 #else
 627 # define UPSCALE 100
 628 # define CALC_STAT(name, val) unsigned name = (val)
 629 # define SHOW_STAT(name) name
 630 # define FMT "%4u%%"
 631 #endif
 632         /*
 633          * %VSZ = s->vsz/MemTotal
 634          */
 635         pmem_shift = BITS_PER_INT-11;
 636         pmem_scale = UPSCALE*(1U<<(BITS_PER_INT-11)) / total_memory;
 637         /* s->vsz is in kb. we want (s->vsz * pmem_scale) to never overflow */
 638         while (pmem_scale >= 512) {
 639                 pmem_scale /= 4;
 640                 pmem_shift -= 2;
 641         }
 642         pmem_half = (1U << pmem_shift) / (ENABLE_FEATURE_TOP_DECIMALS ? 20 : 2);
 643 #if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
 644         busy_jifs = cur_jif.busy - prev_jif.busy;
 645         /* This happens if there were lots of short-lived processes
 646          * between two top updates (e.g. compilation) */
 647         if (total_pcpu < busy_jifs) total_pcpu = busy_jifs;
 648
 649         /*
 650          * CPU% = s->pcpu/sum(s->pcpu) * busy_cpu_ticks/total_cpu_ticks
 651          * (pcpu is delta of sys+user time between samples)
 652          */
 653         /* (cur_jif.xxx - prev_jif.xxx) and s->pcpu are
 654          * in 0..~64000 range (HZ*update_interval).
 655          * we assume that unsigned is at least 32-bit.
 656          */
 657         pcpu_shift = 6;
 658         pcpu_scale = UPSCALE*64 * (uint16_t)busy_jifs;
 659         if (pcpu_scale == 0)
 660                 pcpu_scale = 1;
 661         while (pcpu_scale < (1U << (BITS_PER_INT-2))) {
 662                 pcpu_scale *= 4;
 663                 pcpu_shift += 2;
 664         }
 665         tmp_unsigned = (uint16_t)(cur_jif.total - prev_jif.total) * total_pcpu;
 666         if (tmp_unsigned != 0)
 667                 pcpu_scale /= tmp_unsigned;
 668         /* we want (s->pcpu * pcpu_scale) to never overflow */
 669         while (pcpu_scale >= 1024) {
 670                 pcpu_scale /= 4;
 671                 pcpu_shift -= 2;
 672         }
 673         pcpu_half = (1U << pcpu_shift) / (ENABLE_FEATURE_TOP_DECIMALS ? 20 : 2);
 674         /* printf(" pmem_scale=%u pcpu_scale=%u ", pmem_scale, pcpu_scale); */
 675 #endif
 676
 677         /* Ok, all preliminary data is ready, go through the list */
 678         scr_width += 2; /* account for leading '\n' and trailing NUL */
 679         if (lines_rem > ntop - G_scroll_ofs)
 680                 lines_rem = ntop - G_scroll_ofs;
 681         s = top + G_scroll_ofs;
 682         while (--lines_rem >= 0) {
 683                 unsigned col;
 684                 CALC_STAT(pmem, (s->vsz*pmem_scale + pmem_half) >> pmem_shift);
 685 #if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
 686                 CALC_STAT(pcpu, (s->pcpu*pcpu_scale + pcpu_half) >> pcpu_shift);
 687 #endif
 688
 689                 if (s->vsz >= 100000)
 690                         sprintf(vsz_str_buf, "%6ldm", s->vsz/1024);
 691                 else
 692                         sprintf(vsz_str_buf, "%7lu", s->vsz);
 693                 /* PID PPID USER STAT VSZ %VSZ [%CPU] COMMAND */
 694                 col = snprintf(line_buf, scr_width,
 695                                 "\n" "%5u%6u %-8.8s %s%s" FMT
 696                                 IF_FEATURE_TOP_SMP_PROCESS(" %3d")
 697                                 IF_FEATURE_TOP_CPU_USAGE_PERCENTAGE(FMT)
 698                                 " ",
 699                                 s->pid, s->ppid, get_cached_username(s->uid),
 700                                 s->state, vsz_str_buf,
 701                                 SHOW_STAT(pmem)
 702                                 IF_FEATURE_TOP_SMP_PROCESS(, s->last_seen_on_cpu)
 703                                 IF_FEATURE_TOP_CPU_USAGE_PERCENTAGE(, SHOW_STAT(pcpu))
 704                 );
 705                 if ((int)(col + 1) < scr_width)
 706                         read_cmdline(line_buf + col, scr_width - col, s->pid, s->comm);
 707                 fputs(line_buf, stdout);
 708                 /* printf(" %d/%d %lld/%lld", s->pcpu, total_pcpu,
 709                         cur_jif.busy - prev_jif.busy, cur_jif.total - prev_jif.total); */
 710                 s++;
 711         }
 712         /* printf(" %d", hist_iterations); */
 713         bb_putchar(OPT_BATCH_MODE ? '\n' : '\r');
 714         fflush_all();
 715 }
 716 #undef UPSCALE
 717 #undef SHOW_STAT
 718 #undef CALC_STAT
 719 #undef FMT
 720
 721 static void clearmems(void)
 722 {
 723         clear_username_cache();
 724         free(top);
 725         top = NULL;
 726 }
 727
 728 #if ENABLE_FEATURE_USE_TERMIOS
 729
 730 static void reset_term(void)
 731 {
 732         if (!OPT_BATCH_MODE)
 733                 tcsetattr_stdin_TCSANOW(&initial_settings);
 734 }
 735
 736 static void sig_catcher(int sig)
 737 {
 738         reset_term();
 739         kill_myself_with_sig(sig);
 740 }
 741
 742 #endif /* FEATURE_USE_TERMIOS */
 743
 744 /*
 745  * TOPMEM support
 746  */
 747
 748 typedef unsigned long mem_t;
 749
 750 typedef struct topmem_status_t {
 751         unsigned pid;
 752         char comm[COMM_LEN];
 753         /* vsz doesn't count /dev/xxx mappings except /dev/zero */
 754         mem_t vsz     ;
 755         mem_t vszrw   ;
 756         mem_t rss     ;
 757         mem_t rss_sh  ;
 758         mem_t dirty   ;
 759         mem_t dirty_sh;
 760         mem_t stack   ;
 761 } topmem_status_t;
 762
 763 enum { NUM_SORT_FIELD = 7 };
 764
 765 #define topmem ((topmem_status_t*)top)
 766
 767 #if ENABLE_FEATURE_TOPMEM
 768
 769 static int topmem_sort(char *a, char *b)
 770 {
 771         int n;
 772         mem_t l, r;
 773
 774         n = offsetof(topmem_status_t, vsz) + (sort_field * sizeof(mem_t));
 775         l = *(mem_t*)(a + n);
 776         r = *(mem_t*)(b + n);
 777         if (l == r) {
 778                 l = ((topmem_status_t*)a)->dirty;
 779                 r = ((topmem_status_t*)b)->dirty;
 780         }
 781         /* We want to avoid unsigned->signed and truncation errors */
 782         /* l>r: -1, l=r: 0, l<r: 1 */
 783         n = (l > r) ? -1 : (l != r);
 784         return inverted ? -n : n;
 785 }
 786
 787 /* display header info (meminfo / loadavg) */
 788 static void display_topmem_header(int scr_width, int *lines_rem_p)
 789 {
 790         unsigned long meminfo[MI_MAX];
 791
 792         parse_meminfo(meminfo);
 793
 794         snprintf(line_buf, LINE_BUF_SIZE,
 795                 "Mem total:%lu anon:%lu map:%lu free:%lu",
 796                 meminfo[MI_MEMTOTAL],
 797                 meminfo[MI_ANONPAGES],
 798                 meminfo[MI_MAPPED],
 799                 meminfo[MI_MEMFREE]);
 800         printf(OPT_BATCH_MODE ? "%.*s\n" : "\033[H\033[J%.*s\n", scr_width, line_buf);
 801
 802         snprintf(line_buf, LINE_BUF_SIZE,
 803                 " slab:%lu buf:%lu cache:%lu dirty:%lu write:%lu",
 804                 meminfo[MI_SLAB],
 805                 meminfo[MI_BUFFERS],
 806                 meminfo[MI_CACHED],
 807                 meminfo[MI_DIRTY],
 808                 meminfo[MI_WRITEBACK]);
 809         printf("%.*s\n", scr_width, line_buf);
 810
 811         snprintf(line_buf, LINE_BUF_SIZE,
 812                 "Swap total:%lu free:%lu", // TODO: % used?
 813                 meminfo[MI_SWAPTOTAL],
 814                 meminfo[MI_SWAPFREE]);
 815         printf("%.*s\n", scr_width, line_buf);
 816
 817         (*lines_rem_p) -= 3;
 818 }
 819
 820 static void ulltoa6_and_space(unsigned long long ul, char buf[6])
 821 {
 822         /* see http://en.wikipedia.org/wiki/Tera */
 823         smart_ulltoa5(ul, buf, " mgtpezy")[0] = ' ';
 824 }
 825
 826 static NOINLINE void display_topmem_process_list(int lines_rem, int scr_width)
 827 {
 828 #define HDR_STR "  PID   VSZ VSZRW   RSS (SHR) DIRTY (SHR) STACK"
 829 #define MIN_WIDTH sizeof(HDR_STR)
 830         const topmem_status_t *s = topmem + G_scroll_ofs;
 831         char *cp, ch;
 832
 833         display_topmem_header(scr_width, &lines_rem);
 834
 835         strcpy(line_buf, HDR_STR " COMMAND");
 836         /* Mark the ^FIELD^ we sort by */
 837         cp = &line_buf[5 + sort_field * 6];
 838         ch = "^_"[inverted];
 839         cp[6] = ch;
 840         do *cp++ = ch; while (*cp == ' ');
 841
 842         printf(OPT_BATCH_MODE ? "%.*s" : "\e[7m%.*s\e[0m", scr_width, line_buf);
 843         lines_rem--;
 844
 845         if (lines_rem > ntop - G_scroll_ofs)
 846                 lines_rem = ntop - G_scroll_ofs;
 847         while (--lines_rem >= 0) {
 848                 /* PID VSZ VSZRW RSS (SHR) DIRTY (SHR) COMMAND */
 849                 ulltoa6_and_space(s->pid     , &line_buf[0*6]);
 850                 ulltoa6_and_space(s->vsz     , &line_buf[1*6]);
 851                 ulltoa6_and_space(s->vszrw   , &line_buf[2*6]);
 852                 ulltoa6_and_space(s->rss     , &line_buf[3*6]);
 853                 ulltoa6_and_space(s->rss_sh  , &line_buf[4*6]);
 854                 ulltoa6_and_space(s->dirty   , &line_buf[5*6]);
 855                 ulltoa6_and_space(s->dirty_sh, &line_buf[6*6]);
 856                 ulltoa6_and_space(s->stack   , &line_buf[7*6]);
 857                 line_buf[8*6] = '\0';
 858                 if (scr_width > (int)MIN_WIDTH) {
 859                         read_cmdline(&line_buf[8*6], scr_width - MIN_WIDTH, s->pid, s->comm);
 860                 }
 861                 printf("\n""%.*s", scr_width, line_buf);
 862                 s++;
 863         }
 864         bb_putchar(OPT_BATCH_MODE ? '\n' : '\r');
 865         fflush_all();
 866 #undef HDR_STR
 867 #undef MIN_WIDTH
 868 }
 869
 870 #else
 871 void display_topmem_process_list(int lines_rem, int scr_width);
 872 int topmem_sort(char *a, char *b);
 873 #endif /* TOPMEM */
 874
 875 /*
 876  * end TOPMEM support
 877  */
 878
 879 enum {
 880         TOP_MASK = 0
 881                 | PSSCAN_PID
 882                 | PSSCAN_PPID
 883                 | PSSCAN_VSZ
 884                 | PSSCAN_STIME
 885                 | PSSCAN_UTIME
 886                 | PSSCAN_STATE
 887                 | PSSCAN_COMM
 888                 | PSSCAN_CPU
 889                 | PSSCAN_UIDGID,
 890         TOPMEM_MASK = 0
 891                 | PSSCAN_PID
 892                 | PSSCAN_SMAPS
 893                 | PSSCAN_COMM,
 894         EXIT_MASK = (unsigned)-1,
 895 };
 896
 897 #if ENABLE_FEATURE_USE_TERMIOS
 898 static unsigned handle_input(unsigned scan_mask, unsigned interval)
 899 {
 900         if (option_mask32 & OPT_EOF) {
 901                 /* EOF on stdin ("top </dev/null") */
 902                 sleep(interval);
 903                 return scan_mask;
 904         }
 905
 906         while (1) {
 907                 int32_t c;
 908
 909                 c = read_key(STDIN_FILENO, G.kbd_input, interval * 1000);
 910                 if (c == -1 && errno != EAGAIN) {
 911                         /* error/EOF */
 912                         option_mask32 |= OPT_EOF;
 913                         break;
 914                 }
 915                 interval = 0;
 916
 917                 if (c == initial_settings.c_cc[VINTR])
 918                         return EXIT_MASK;
 919                 if (c == initial_settings.c_cc[VEOF])
 920                         return EXIT_MASK;
 921
 922                 if (c == KEYCODE_UP) {
 923                         G_scroll_ofs--;
 924                         goto normalize_ofs;
 925                 }
 926                 if (c == KEYCODE_DOWN) {
 927                         G_scroll_ofs++;
 928                         goto normalize_ofs;
 929                 }
 930                 if (c == KEYCODE_HOME) {
 931                         G_scroll_ofs = 0;
 932                         break;
 933                 }
 934                 if (c == KEYCODE_END) {
 935                         G_scroll_ofs = ntop - G.lines / 2;
 936                         goto normalize_ofs;
 937                 }
 938                 if (c == KEYCODE_PAGEUP) {
 939                         G_scroll_ofs -= G.lines / 2;
 940                         goto normalize_ofs;
 941                 }
 942                 if (c == KEYCODE_PAGEDOWN) {
 943                         G_scroll_ofs += G.lines / 2;
 944  normalize_ofs:
 945                         if (G_scroll_ofs >= ntop)
 946                                 G_scroll_ofs = ntop - 1;
 947                         if (G_scroll_ofs < 0)
 948                                 G_scroll_ofs = 0;
 949                         break;
 950                 }
 951
 952                 c |= 0x20; /* lowercase */
 953                 if (c == 'q')
 954                         return EXIT_MASK;
 955
 956                 if (c == 'n') {
 957                         IF_FEATURE_TOPMEM(scan_mask = TOP_MASK;)
 958                         sort_function[0] = pid_sort;
 959                         continue;
 960                 }
 961                 if (c == 'm') {
 962                         IF_FEATURE_TOPMEM(scan_mask = TOP_MASK;)
 963                         sort_function[0] = mem_sort;
 964 # if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
 965                         sort_function[1] = pcpu_sort;
 966                         sort_function[2] = time_sort;
 967 # endif
 968                         continue;
 969                 }
 970 # if ENABLE_FEATURE_SHOW_THREADS
 971                 if (c == 'h'
 972                 IF_FEATURE_TOPMEM(&& scan_mask != TOPMEM_MASK)
 973                 ) {
 974                         scan_mask ^= PSSCAN_TASKS;
 975                         continue;
 976                 }
 977 # endif
 978 # if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
 979                 if (c == 'p') {
 980                         IF_FEATURE_TOPMEM(scan_mask = TOP_MASK;)
 981                         sort_function[0] = pcpu_sort;
 982                         sort_function[1] = mem_sort;
 983                         sort_function[2] = time_sort;
 984                         continue;
 985                 }
 986                 if (c == 't') {
 987                         IF_FEATURE_TOPMEM(scan_mask = TOP_MASK;)
 988                         sort_function[0] = time_sort;
 989                         sort_function[1] = mem_sort;
 990                         sort_function[2] = pcpu_sort;
 991                         continue;
 992                 }
 993 #  if ENABLE_FEATURE_TOPMEM
 994                 if (c == 's') {
 995                         scan_mask = TOPMEM_MASK;
 996                         free(prev_hist);
 997                         prev_hist = NULL;
 998                         prev_hist_count = 0;
 999                         sort_field = (sort_field + 1) % NUM_SORT_FIELD;
1000                         continue;
1001                 }
1002 #  endif
1003                 if (c == 'r') {
1004                         inverted ^= 1;
1005                         continue;
1006                 }
1007 #  if ENABLE_FEATURE_TOP_SMP_CPU
1008                 /* procps-2.0.18 uses 'C', 3.2.7 uses '1' */
1009                 if (c == 'c' || c == '1') {
1010                         /* User wants to toggle per cpu <> aggregate */
1011                         if (smp_cpu_info) {
1012                                 free(cpu_prev_jif);
1013                                 free(cpu_jif);
1014                                 cpu_jif = &cur_jif;
1015                                 cpu_prev_jif = &prev_jif;
1016                         } else {
1017                                 /* Prepare for xrealloc() */
1018                                 cpu_jif = cpu_prev_jif = NULL;
1019                         }
1020                         num_cpus = 0;
1021                         smp_cpu_info = !smp_cpu_info;
1022                         get_jiffy_counts();
1023                         continue;
1024                 }
1025 #  endif
1026 # endif
1027                 break; /* unknown key -> force refresh */
1028         }
1029
1030         return scan_mask;
1031 }
1032 #endif
1033
1034 //usage:#if ENABLE_FEATURE_SHOW_THREADS || ENABLE_FEATURE_TOP_SMP_CPU
1035 //usage:# define IF_SHOW_THREADS_OR_TOP_SMP(...) __VA_ARGS__
1036 //usage:#else
1037 //usage:# define IF_SHOW_THREADS_OR_TOP_SMP(...)
1038 //usage:#endif
1039 //usage:#define top_trivial_usage
1040 //usage:       "[-b] [-nCOUNT] [-dSECONDS]" IF_FEATURE_TOPMEM(" [-m]")
1041 //usage:#define top_full_usage "\n\n"
1042 //usage:       "Provide a view of process activity in real time."
1043 //usage:   "\n""Read the status of all processes from /proc each SECONDS"
1044 //usage:   "\n""and display a screenful of them."
1045 //usage:   "\n"
1046 //usage:        IF_FEATURE_USE_TERMIOS(
1047 //usage:       "Keys:"
1048 //usage:   "\n""        N/M"
1049 //usage:                IF_FEATURE_TOP_CPU_USAGE_PERCENTAGE("/P")
1050 //usage:                IF_FEATURE_TOP_CPU_USAGE_PERCENTAGE("/T")
1051 //usage:           ": " IF_FEATURE_TOPMEM("show CPU usage, ") "sort by pid/mem"
1052 //usage:                IF_FEATURE_TOP_CPU_USAGE_PERCENTAGE("/cpu")
1053 //usage:                IF_FEATURE_TOP_CPU_USAGE_PERCENTAGE("/time")
1054 //usage:        IF_FEATURE_TOPMEM(
1055 //usage:   "\n""        S: show memory"
1056 //usage:        )
1057 //usage:   "\n""        R: reverse sort"
1058 //usage:        IF_SHOW_THREADS_OR_TOP_SMP(
1059 //usage:   "\n""        "
1060 //usage:                IF_FEATURE_SHOW_THREADS("H: toggle threads")
1061 //usage:                IF_FEATURE_SHOW_THREADS(IF_FEATURE_TOP_SMP_CPU(", "))
1062 //usage:                IF_FEATURE_TOP_SMP_CPU("1: toggle SMP")
1063 //usage:        )
1064 //usage:   "\n""        Q,^C: exit"
1065 //usage:   "\n"
1066 //usage:   "\n""Options:"
1067 //usage:        )
1068 //usage:   "\n""        -b      Batch mode"
1069 //usage:   "\n""        -n N    Exit after N iterations"
1070 //usage:   "\n""        -d N    Delay between updates"
1071 //usage:        IF_FEATURE_TOPMEM(
1072 //usage:   "\n""        -m      Same as 's' key"
1073 //usage:        )
1074
1075 /* Interactive testing:
1076  * echo sss | ./busybox top
1077  * - shows memory screen
1078  * echo sss | ./busybox top -bn1 >mem
1079  * - saves memory screen - the *whole* list, not first NROWS processes!
1080  * echo .m.s.s.s.s.s.s.q | ./busybox top -b >z
1081  * - saves several different screens, and exits
1082  *
1083  * TODO: -i STRING param as a better alternative?
1084  */
1085
1086 int top_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
1087 int top_main(int argc UNUSED_PARAM, char **argv)
1088 {
1089         int iterations;
1090         unsigned col;
1091         unsigned interval;
1092         char *str_interval, *str_iterations;
1093         unsigned scan_mask = TOP_MASK;
1094 #if ENABLE_FEATURE_USE_TERMIOS
1095         struct termios new_settings;
1096 #endif
1097
1098         INIT_G();
1099
1100         interval = 5; /* default update interval is 5 seconds */
1101         iterations = 0; /* infinite */
1102 #if ENABLE_FEATURE_TOP_SMP_CPU
1103         /*num_cpus = 0;*/
1104         /*smp_cpu_info = 0;*/  /* to start with show aggregate */
1105         cpu_jif = &cur_jif;
1106         cpu_prev_jif = &prev_jif;
1107 #endif
1108
1109         /* all args are options; -n NUM */
1110         opt_complementary = "-"; /* options can be specified w/o dash */
1111         col = getopt32(argv, "d:n:b"IF_FEATURE_TOPMEM("m"), &str_interval, &str_iterations);
1112 #if ENABLE_FEATURE_TOPMEM
1113         if (col & OPT_m) /* -m (busybox specific) */
1114                 scan_mask = TOPMEM_MASK;
1115 #endif
1116         if (col & OPT_d) {
1117                 /* work around for "-d 1" -> "-d -1" done by getopt32
1118                  * (opt_complementary == "-" does this) */
1119                 if (str_interval[0] == '-')
1120                         str_interval++;
1121                 /* Need to limit it to not overflow poll timeout */
1122                 interval = xatou16(str_interval);
1123         }
1124         if (col & OPT_n) {
1125                 if (str_iterations[0] == '-')
1126                         str_iterations++;
1127                 iterations = xatou(str_iterations);
1128         }
1129
1130         /* change to /proc */
1131         xchdir("/proc");
1132
1133 #if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
1134         sort_function[0] = pcpu_sort;
1135         sort_function[1] = mem_sort;
1136         sort_function[2] = time_sort;
1137 #else
1138         sort_function[0] = mem_sort;
1139 #endif
1140
1141         if (OPT_BATCH_MODE) {
1142                 option_mask32 |= OPT_EOF;
1143         }
1144 #if ENABLE_FEATURE_USE_TERMIOS
1145         else {
1146                 tcgetattr(0, (void *) &initial_settings);
1147                 memcpy(&new_settings, &initial_settings, sizeof(new_settings));
1148                 /* unbuffered input, turn off echo */
1149                 new_settings.c_lflag &= ~(ISIG | ICANON | ECHO | ECHONL);
1150                 tcsetattr_stdin_TCSANOW(&new_settings);
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 #if ENABLE_FEATURE_USE_TERMIOS
1169                         /* We output to stdout, we need size of stdout (not stdin)! */
1170                         get_terminal_width_height(STDOUT_FILENO, &col, &G.lines);
1171                         if (G.lines < 5 || col < 10) {
1172                                 sleep(interval);
1173                                 continue;
1174                         }
1175 #endif
1176                         if (col > LINE_BUF_SIZE - 2)
1177                                 col = LINE_BUF_SIZE - 2;
1178                 }
1179
1180                 /* read process IDs & status for all the processes */
1181                 ntop = 0;
1182                 while ((p = procps_scan(p, scan_mask)) != NULL) {
1183                         int n;
1184
1185                         IF_FEATURE_TOPMEM(if (scan_mask != TOPMEM_MASK)) {
1186                                 n = ntop;
1187                                 top = xrealloc_vector(top, 6, ntop++);
1188                                 top[n].pid = p->pid;
1189                                 top[n].ppid = p->ppid;
1190                                 top[n].vsz = p->vsz;
1191 #if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
1192                                 top[n].ticks = p->stime + p->utime;
1193 #endif
1194                                 top[n].uid = p->uid;
1195                                 strcpy(top[n].state, p->state);
1196                                 strcpy(top[n].comm, p->comm);
1197 #if ENABLE_FEATURE_TOP_SMP_PROCESS
1198                                 top[n].last_seen_on_cpu = p->last_seen_on_cpu;
1199 #endif
1200                         }
1201 #if ENABLE_FEATURE_TOPMEM
1202                         else { /* TOPMEM */
1203                                 if (!(p->smaps.mapped_ro | p->smaps.mapped_rw))
1204                                         continue; /* kernel threads are ignored */
1205                                 n = ntop;
1206                                 /* No bug here - top and topmem are the same */
1207                                 top = xrealloc_vector(topmem, 6, ntop++);
1208                                 strcpy(topmem[n].comm, p->comm);
1209                                 topmem[n].pid      = p->pid;
1210                                 topmem[n].vsz      = p->smaps.mapped_rw + p->smaps.mapped_ro;
1211                                 topmem[n].vszrw    = p->smaps.mapped_rw;
1212                                 topmem[n].rss_sh   = p->smaps.shared_clean + p->smaps.shared_dirty;
1213                                 topmem[n].rss      = p->smaps.private_clean + p->smaps.private_dirty + topmem[n].rss_sh;
1214                                 topmem[n].dirty    = p->smaps.private_dirty + p->smaps.shared_dirty;
1215                                 topmem[n].dirty_sh = p->smaps.shared_dirty;
1216                                 topmem[n].stack    = p->smaps.stack;
1217                         }
1218 #endif
1219                 } /* end of "while we read /proc" */
1220                 if (ntop == 0) {
1221                         bb_error_msg("no process info in /proc");
1222                         break;
1223                 }
1224
1225                 IF_FEATURE_TOPMEM(if (scan_mask != TOPMEM_MASK)) {
1226 #if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
1227                         if (!prev_hist_count) {
1228                                 do_stats();
1229                                 usleep(100000);
1230                                 clearmems();
1231                                 continue;
1232                         }
1233                         do_stats();
1234                         /* TODO: we don't need to sort all 10000 processes, we need to find top 24! */
1235                         qsort(top, ntop, sizeof(top_status_t), (void*)mult_lvl_cmp);
1236 #else
1237                         qsort(top, ntop, sizeof(top_status_t), (void*)(sort_function[0]));
1238 #endif
1239                         display_process_list(G.lines, col);
1240                 }
1241 #if ENABLE_FEATURE_TOPMEM
1242                 else { /* TOPMEM */
1243                         qsort(topmem, ntop, sizeof(topmem_status_t), (void*)topmem_sort);
1244                         display_topmem_process_list(G.lines, col);
1245                 }
1246 #endif
1247                 clearmems();
1248                 if (iterations >= 0 && !--iterations)
1249                         break;
1250 #if !ENABLE_FEATURE_USE_TERMIOS
1251                 sleep(interval);
1252 #else
1253                 scan_mask = handle_input(scan_mask, interval);
1254 #endif
1255         } /* end of "while (not Q)" */
1256
1257         bb_putchar('\n');
1258 #if ENABLE_FEATURE_USE_TERMIOS
1259         reset_term();
1260 #endif
1261         if (ENABLE_FEATURE_CLEAN_UP) {
1262                 clearmems();
1263 #if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
1264                 free(prev_hist);
1265 #endif
1266         }
1267         return EXIT_SUCCESS;
1268 }