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
pid_sort(top_status_t * P,top_status_t * Q)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
mem_sort(top_status_t * P,top_status_t * Q)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
pcpu_sort(top_status_t * P,top_status_t * Q)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
time_sort(top_status_t * P,top_status_t * Q)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
mult_lvl_cmp(void * a,void * b)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
read_cpu_jiffy(FILE * fp,jiffy_counts_t * p_jif)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
get_jiffy_counts(void)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
do_stats(void)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) */
fmt_100percent_8(char pbuf[8],unsigned value,unsigned total)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
display_cpus(int scr_width,char * scrbuf,int * lines_rem_p)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 }
1269