source: MondoRescue/branches/3.3/mindi-busybox/procps/top.c@ 3621

Last change on this file since 3621 was 3621, checked in by Bruno Cornec, 7 years ago

New 3?3 banch for incorporation of latest busybox 1.25. Changing minor version to handle potential incompatibilities.
File size: 32.6 KB
Line 
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
53//config:config TOP
54//config: bool "top"
55//config: default y
56//config: help
57//config: The top program provides a dynamic real-time view of a running
58//config: system.
59//config:
60//config:config FEATURE_TOP_CPU_USAGE_PERCENTAGE
61//config: bool "Show CPU per-process usage percentage"
62//config: default y
63//config: depends on TOP
64//config: help
65//config: Make top display CPU usage for each process.
66//config: This adds about 2k.
67//config:
68//config:config FEATURE_TOP_CPU_GLOBAL_PERCENTS
69//config: bool "Show CPU global usage percentage"
70//config: default y
71//config: depends on FEATURE_TOP_CPU_USAGE_PERCENTAGE
72//config: help
73//config: Makes top display "CPU: NN% usr NN% sys..." line.
74//config: This adds about 0.5k.
75//config:
76//config:config FEATURE_TOP_SMP_CPU
77//config: bool "SMP CPU usage display ('c' key)"
78//config: default y
79//config: depends on FEATURE_TOP_CPU_GLOBAL_PERCENTS
80//config: help
81//config: Allow 'c' key to switch between individual/cumulative CPU stats
82//config: This adds about 0.5k.
83//config:
84//config:config FEATURE_TOP_DECIMALS
85//config: bool "Show 1/10th of a percent in CPU/mem statistics"
86//config: default y
87//config: depends on FEATURE_TOP_CPU_USAGE_PERCENTAGE
88//config: help
89//config: Show 1/10th of a percent in CPU/mem statistics.
90//config: This adds about 0.3k.
91//config:
92//config:config FEATURE_TOP_SMP_PROCESS
93//config: bool "Show CPU process runs on ('j' field)"
94//config: default y
95//config: depends on TOP
96//config: help
97//config: Show CPU where process was last found running on.
98//config: This is the 'j' field.
99//config:
100//config:config FEATURE_TOPMEM
101//config: bool "Topmem command ('s' key)"
102//config: default y
103//config: depends on TOP
104//config: help
105//config: Enable 's' in top (gives lots of memory info).
106
107#include "libbb.h"
108#include "common_bufsiz.h"
109
110
111typedef struct top_status_t {
112 unsigned long vsz;
113#if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
114 unsigned long ticks;
115 unsigned pcpu; /* delta of ticks */
116#endif
117 unsigned pid, ppid;
118 unsigned uid;
119 char state[4];
120 char comm[COMM_LEN];
121#if ENABLE_FEATURE_TOP_SMP_PROCESS
122 int last_seen_on_cpu;
123#endif
124} top_status_t;
125
126typedef struct jiffy_counts_t {
127 /* Linux 2.4.x has only first four */
128 unsigned long long usr, nic, sys, idle;
129 unsigned long long iowait, irq, softirq, steal;
130 unsigned long long total;
131 unsigned long long busy;
132} jiffy_counts_t;
133
134/* This structure stores some critical information from one frame to
135 the next. Used for finding deltas. */
136typedef struct save_hist {
137 unsigned long ticks;
138 pid_t pid;
139} save_hist;
140
141typedef int (*cmp_funcp)(top_status_t *P, top_status_t *Q);
142
143
144enum { SORT_DEPTH = 3 };
145
146
147struct globals {
148 top_status_t *top;
149 int ntop;
150 smallint inverted;
151#if ENABLE_FEATURE_TOPMEM
152 smallint sort_field;
153#endif
154#if ENABLE_FEATURE_TOP_SMP_CPU
155 smallint smp_cpu_info; /* one/many cpu info lines? */
156#endif
157 unsigned lines; /* screen height */
158#if ENABLE_FEATURE_USE_TERMIOS
159 struct termios initial_settings;
160 int scroll_ofs;
161#define G_scroll_ofs G.scroll_ofs
162#else
163#define G_scroll_ofs 0
164#endif
165#if !ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
166 cmp_funcp sort_function[1];
167#else
168 cmp_funcp sort_function[SORT_DEPTH];
169 struct save_hist *prev_hist;
170 int prev_hist_count;
171 jiffy_counts_t cur_jif, prev_jif;
172 /* int hist_iterations; */
173 unsigned total_pcpu;
174 /* unsigned long total_vsz; */
175#endif
176#if ENABLE_FEATURE_TOP_SMP_CPU
177 /* Per CPU samples: current and last */
178 jiffy_counts_t *cpu_jif, *cpu_prev_jif;
179 int num_cpus;
180#endif
181#if ENABLE_FEATURE_USE_TERMIOS
182 char kbd_input[KEYCODE_BUFFER_SIZE];
183#endif
184 char line_buf[80];
185}; //FIX_ALIASING; - large code growth
186enum { LINE_BUF_SIZE = COMMON_BUFSIZE - offsetof(struct globals, line_buf) };
187#define G (*(struct globals*)bb_common_bufsiz1)
188#define top (G.top )
189#define ntop (G.ntop )
190#define sort_field (G.sort_field )
191#define inverted (G.inverted )
192#define smp_cpu_info (G.smp_cpu_info )
193#define initial_settings (G.initial_settings )
194#define sort_function (G.sort_function )
195#define prev_hist (G.prev_hist )
196#define prev_hist_count (G.prev_hist_count )
197#define cur_jif (G.cur_jif )
198#define prev_jif (G.prev_jif )
199#define cpu_jif (G.cpu_jif )
200#define cpu_prev_jif (G.cpu_prev_jif )
201#define num_cpus (G.num_cpus )
202#define total_pcpu (G.total_pcpu )
203#define line_buf (G.line_buf )
204#define INIT_G() do { \
205 setup_common_bufsiz(); \
206 BUILD_BUG_ON(sizeof(G) > COMMON_BUFSIZE); \
207 BUILD_BUG_ON(LINE_BUF_SIZE <= 80); \
208} while (0)
209
210enum {
211 OPT_d = (1 << 0),
212 OPT_n = (1 << 1),
213 OPT_b = (1 << 2),
214 OPT_m = (1 << 3),
215 OPT_EOF = (1 << 4), /* pseudo: "we saw EOF in stdin" */
216};
217#define OPT_BATCH_MODE (option_mask32 & OPT_b)
218
219
220#if ENABLE_FEATURE_USE_TERMIOS
221static int pid_sort(top_status_t *P, top_status_t *Q)
222{
223 /* Buggy wrt pids with high bit set */
224 /* (linux pids are in [1..2^15-1]) */
225 return (Q->pid - P->pid);
226}
227#endif
228
229static int mem_sort(top_status_t *P, top_status_t *Q)
230{
231 /* We want to avoid unsigned->signed and truncation errors */
232 if (Q->vsz < P->vsz) return -1;
233 return Q->vsz != P->vsz; /* 0 if ==, 1 if > */
234}
235
236
237#if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
238
239static int pcpu_sort(top_status_t *P, top_status_t *Q)
240{
241 /* Buggy wrt ticks with high bit set */
242 /* Affects only processes for which ticks overflow */
243 return (int)Q->pcpu - (int)P->pcpu;
244}
245
246static int time_sort(top_status_t *P, top_status_t *Q)
247{
248 /* We want to avoid unsigned->signed and truncation errors */
249 if (Q->ticks < P->ticks) return -1;
250 return Q->ticks != P->ticks; /* 0 if ==, 1 if > */
251}
252
253static int mult_lvl_cmp(void* a, void* b)
254{
255 int i, cmp_val;
256
257 for (i = 0; i < SORT_DEPTH; i++) {
258 cmp_val = (*sort_function[i])(a, b);
259 if (cmp_val != 0)
260 break;
261 }
262 return inverted ? -cmp_val : cmp_val;
263}
264
265static NOINLINE int read_cpu_jiffy(FILE *fp, jiffy_counts_t *p_jif)
266{
267#if !ENABLE_FEATURE_TOP_SMP_CPU
268 static const char fmt[] ALIGN1 = "cpu %llu %llu %llu %llu %llu %llu %llu %llu";
269#else
270 static const char fmt[] ALIGN1 = "cp%*s %llu %llu %llu %llu %llu %llu %llu %llu";
271#endif
272 int ret;
273
274 if (!fgets(line_buf, LINE_BUF_SIZE, fp) || line_buf[0] != 'c' /* not "cpu" */)
275 return 0;
276 ret = sscanf(line_buf, fmt,
277 &p_jif->usr, &p_jif->nic, &p_jif->sys, &p_jif->idle,
278 &p_jif->iowait, &p_jif->irq, &p_jif->softirq,
279 &p_jif->steal);
280 if (ret >= 4) {
281 p_jif->total = p_jif->usr + p_jif->nic + p_jif->sys + p_jif->idle
282 + p_jif->iowait + p_jif->irq + p_jif->softirq + p_jif->steal;
283 /* procps 2.x does not count iowait as busy time */
284 p_jif->busy = p_jif->total - p_jif->idle - p_jif->iowait;
285 }
286
287 return ret;
288}
289
290static void get_jiffy_counts(void)
291{
292 FILE* fp = xfopen_for_read("stat");
293
294 /* We need to parse cumulative counts even if SMP CPU display is on,
295 * they are used to calculate per process CPU% */
296 prev_jif = cur_jif;
297 if (read_cpu_jiffy(fp, &cur_jif) < 4)
298 bb_error_msg_and_die("can't read '%s'", "/proc/stat");
299
300#if !ENABLE_FEATURE_TOP_SMP_CPU
301 fclose(fp);
302 return;
303#else
304 if (!smp_cpu_info) {
305 fclose(fp);
306 return;
307 }
308
309 if (!num_cpus) {
310 /* First time here. How many CPUs?
311 * There will be at least 1 /proc/stat line with cpu%d
312 */
313 while (1) {
314 cpu_jif = xrealloc_vector(cpu_jif, 1, num_cpus);
315 if (read_cpu_jiffy(fp, &cpu_jif[num_cpus]) <= 4)
316 break;
317 num_cpus++;
318 }
319 if (num_cpus == 0) /* /proc/stat with only "cpu ..." line?! */
320 smp_cpu_info = 0;
321
322 cpu_prev_jif = xzalloc(sizeof(cpu_prev_jif[0]) * num_cpus);
323
324 /* Otherwise the first per cpu display shows all 100% idles */
325 usleep(50000);
326 } else { /* Non first time invocation */
327 jiffy_counts_t *tmp;
328 int i;
329
330 /* First switch the sample pointers: no need to copy */
331 tmp = cpu_prev_jif;
332 cpu_prev_jif = cpu_jif;
333 cpu_jif = tmp;
334
335 /* Get the new samples */
336 for (i = 0; i < num_cpus; i++)
337 read_cpu_jiffy(fp, &cpu_jif[i]);
338 }
339#endif
340 fclose(fp);
341}
342
343static void do_stats(void)
344{
345 top_status_t *cur;
346 pid_t pid;
347 int i, last_i, n;
348 struct save_hist *new_hist;
349
350 get_jiffy_counts();
351 total_pcpu = 0;
352 /* total_vsz = 0; */
353 new_hist = xmalloc(sizeof(new_hist[0]) * ntop);
354 /*
355 * Make a pass through the data to get stats.
356 */
357 /* hist_iterations = 0; */
358 i = 0;
359 for (n = 0; n < ntop; n++) {
360 cur = top + n;
361
362 /*
363 * Calculate time in cur process. Time is sum of user time
364 * and system time
365 */
366 pid = cur->pid;
367 new_hist[n].ticks = cur->ticks;
368 new_hist[n].pid = pid;
369
370 /* find matching entry from previous pass */
371 cur->pcpu = 0;
372 /* do not start at index 0, continue at last used one
373 * (brought hist_iterations from ~14000 down to 172) */
374 last_i = i;
375 if (prev_hist_count) do {
376 if (prev_hist[i].pid == pid) {
377 cur->pcpu = cur->ticks - prev_hist[i].ticks;
378 total_pcpu += cur->pcpu;
379 break;
380 }
381 i = (i+1) % prev_hist_count;
382 /* hist_iterations++; */
383 } while (i != last_i);
384 /* total_vsz += cur->vsz; */
385 }
386
387 /*
388 * Save cur frame's information.
389 */
390 free(prev_hist);
391 prev_hist = new_hist;
392 prev_hist_count = ntop;
393}
394
395#endif /* FEATURE_TOP_CPU_USAGE_PERCENTAGE */
396
397#if ENABLE_FEATURE_TOP_CPU_GLOBAL_PERCENTS && ENABLE_FEATURE_TOP_DECIMALS
398/* formats 7 char string (8 with terminating NUL) */
399static char *fmt_100percent_8(char pbuf[8], unsigned value, unsigned total)
400{
401 unsigned t;
402 if (value >= total) { /* 100% ? */
403 strcpy(pbuf, " 100% ");
404 return pbuf;
405 }
406 /* else generate " [N/space]N.N% " string */
407 value = 1000 * value / total;
408 t = value / 100;
409 value = value % 100;
410 pbuf[0] = ' ';
411 pbuf[1] = t ? t + '0' : ' ';
412 pbuf[2] = '0' + (value / 10);
413 pbuf[3] = '.';
414 pbuf[4] = '0' + (value % 10);
415 pbuf[5] = '%';
416 pbuf[6] = ' ';
417 pbuf[7] = '\0';
418 return pbuf;
419}
420#endif
421
422#if ENABLE_FEATURE_TOP_CPU_GLOBAL_PERCENTS
423static void display_cpus(int scr_width, char *scrbuf, int *lines_rem_p)
424{
425 /*
426 * xxx% = (cur_jif.xxx - prev_jif.xxx) / (cur_jif.total - prev_jif.total) * 100%
427 */
428 unsigned total_diff;
429 jiffy_counts_t *p_jif, *p_prev_jif;
430 int i;
431# if ENABLE_FEATURE_TOP_SMP_CPU
432 int n_cpu_lines;
433# endif
434
435 /* using (unsigned) casts to make operations cheaper */
436# define CALC_TOTAL_DIFF do { \
437 total_diff = (unsigned)(p_jif->total - p_prev_jif->total); \
438 if (total_diff == 0) total_diff = 1; \
439} while (0)
440
441# if ENABLE_FEATURE_TOP_DECIMALS
442# define CALC_STAT(xxx) char xxx[8]
443# define SHOW_STAT(xxx) fmt_100percent_8(xxx, (unsigned)(p_jif->xxx - p_prev_jif->xxx), total_diff)
444# define FMT "%s"
445# else
446# define CALC_STAT(xxx) unsigned xxx = 100 * (unsigned)(p_jif->xxx - p_prev_jif->xxx) / total_diff
447# define SHOW_STAT(xxx) xxx
448# define FMT "%4u%% "
449# endif
450
451# if !ENABLE_FEATURE_TOP_SMP_CPU
452 {
453 i = 1;
454 p_jif = &cur_jif;
455 p_prev_jif = &prev_jif;
456# else
457 /* Loop thru CPU(s) */
458 n_cpu_lines = smp_cpu_info ? num_cpus : 1;
459 if (n_cpu_lines > *lines_rem_p)
460 n_cpu_lines = *lines_rem_p;
461
462 for (i = 0; i < n_cpu_lines; i++) {
463 p_jif = &cpu_jif[i];
464 p_prev_jif = &cpu_prev_jif[i];
465# endif
466 CALC_TOTAL_DIFF;
467
468 { /* Need a block: CALC_STAT are declarations */
469 CALC_STAT(usr);
470 CALC_STAT(sys);
471 CALC_STAT(nic);
472 CALC_STAT(idle);
473 CALC_STAT(iowait);
474 CALC_STAT(irq);
475 CALC_STAT(softirq);
476 /*CALC_STAT(steal);*/
477
478 snprintf(scrbuf, scr_width,
479 /* Barely fits in 79 chars when in "decimals" mode. */
480# if ENABLE_FEATURE_TOP_SMP_CPU
481 "CPU%s:"FMT"usr"FMT"sys"FMT"nic"FMT"idle"FMT"io"FMT"irq"FMT"sirq",
482 (smp_cpu_info ? utoa(i) : ""),
483# else
484 "CPU:"FMT"usr"FMT"sys"FMT"nic"FMT"idle"FMT"io"FMT"irq"FMT"sirq",
485# endif
486 SHOW_STAT(usr), SHOW_STAT(sys), SHOW_STAT(nic), SHOW_STAT(idle),
487 SHOW_STAT(iowait), SHOW_STAT(irq), SHOW_STAT(softirq)
488 /*, SHOW_STAT(steal) - what is this 'steal' thing? */
489 /* I doubt anyone wants to know it */
490 );
491 puts(scrbuf);
492 }
493 }
494# undef SHOW_STAT
495# undef CALC_STAT
496# undef FMT
497 *lines_rem_p -= i;
498}
499#else /* !ENABLE_FEATURE_TOP_CPU_GLOBAL_PERCENTS */
500# define display_cpus(scr_width, scrbuf, lines_rem) ((void)0)
501#endif
502
503enum {
504 MI_MEMTOTAL,
505 MI_MEMFREE,
506 MI_MEMSHARED,
507 MI_SHMEM,
508 MI_BUFFERS,
509 MI_CACHED,
510 MI_SWAPTOTAL,
511 MI_SWAPFREE,
512 MI_DIRTY,
513 MI_WRITEBACK,
514 MI_ANONPAGES,
515 MI_MAPPED,
516 MI_SLAB,
517 MI_MAX
518};
519
520static void parse_meminfo(unsigned long meminfo[MI_MAX])
521{
522 static const char fields[] ALIGN1 =
523 "MemTotal\0"
524 "MemFree\0"
525 "MemShared\0"
526 "Shmem\0"
527 "Buffers\0"
528 "Cached\0"
529 "SwapTotal\0"
530 "SwapFree\0"
531 "Dirty\0"
532 "Writeback\0"
533 "AnonPages\0"
534 "Mapped\0"
535 "Slab\0";
536 char buf[60]; /* actual lines we expect are ~30 chars or less */
537 FILE *f;
538 int i;
539
540 memset(meminfo, 0, sizeof(meminfo[0]) * MI_MAX);
541 f = xfopen_for_read("meminfo");
542 while (fgets(buf, sizeof(buf), f) != NULL) {
543 char *c = strchr(buf, ':');
544 if (!c)
545 continue;
546 *c = '\0';
547 i = index_in_strings(fields, buf);
548 if (i >= 0)
549 meminfo[i] = strtoul(c+1, NULL, 10);
550 }
551 fclose(f);
552}
553
554static unsigned long display_header(int scr_width, int *lines_rem_p)
555{
556 char scrbuf[100]; /* [80] was a bit too low on 8Gb ram box */
557 char *buf;
558 unsigned long meminfo[MI_MAX];
559
560 parse_meminfo(meminfo);
561
562 /* Output memory info */
563 if (scr_width > (int)sizeof(scrbuf))
564 scr_width = sizeof(scrbuf);
565 snprintf(scrbuf, scr_width,
566 "Mem: %luK used, %luK free, %luK shrd, %luK buff, %luK cached",
567 meminfo[MI_MEMTOTAL] - meminfo[MI_MEMFREE],
568 meminfo[MI_MEMFREE],
569 meminfo[MI_MEMSHARED] + meminfo[MI_SHMEM],
570 meminfo[MI_BUFFERS],
571 meminfo[MI_CACHED]);
572 /* Go to top & clear to the end of screen */
573 printf(OPT_BATCH_MODE ? "%s\n" : "\033[H\033[J%s\n", scrbuf);
574 (*lines_rem_p)--;
575
576 /* Display CPU time split as percentage of total time.
577 * This displays either a cumulative line or one line per CPU.
578 */
579 display_cpus(scr_width, scrbuf, lines_rem_p);
580
581 /* Read load average as a string */
582 buf = stpcpy(scrbuf, "Load average: ");
583 open_read_close("loadavg", buf, sizeof(scrbuf) - sizeof("Load average: "));
584 scrbuf[scr_width - 1] = '\0';
585 strchrnul(buf, '\n')[0] = '\0';
586 puts(scrbuf);
587 (*lines_rem_p)--;
588
589 return meminfo[MI_MEMTOTAL];
590}
591
592static NOINLINE void display_process_list(int lines_rem, int scr_width)
593{
594 enum {
595 BITS_PER_INT = sizeof(int) * 8
596 };
597
598 top_status_t *s;
599 char vsz_str_buf[8];
600 unsigned long total_memory = display_header(scr_width, &lines_rem); /* or use total_vsz? */
601 /* xxx_shift and xxx_scale variables allow us to replace
602 * expensive divides with multiply and shift */
603 unsigned pmem_shift, pmem_scale, pmem_half;
604#if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
605 unsigned tmp_unsigned;
606 unsigned pcpu_shift, pcpu_scale, pcpu_half;
607 unsigned busy_jifs;
608#endif
609
610 /* what info of the processes is shown */
611 printf(OPT_BATCH_MODE ? "%.*s" : "\033[7m%.*s\033[0m", scr_width,
612 " PID PPID USER STAT VSZ %VSZ"
613 IF_FEATURE_TOP_SMP_PROCESS(" CPU")
614 IF_FEATURE_TOP_CPU_USAGE_PERCENTAGE(" %CPU")
615 " COMMAND");
616 lines_rem--;
617
618#if ENABLE_FEATURE_TOP_DECIMALS
619# define UPSCALE 1000
620# define CALC_STAT(name, val) div_t name = div((val), 10)
621# define SHOW_STAT(name) name.quot, '0'+name.rem
622# define FMT "%3u.%c"
623#else
624# define UPSCALE 100
625# define CALC_STAT(name, val) unsigned name = (val)
626# define SHOW_STAT(name) name
627# define FMT "%4u%%"
628#endif
629 /*
630 * %VSZ = s->vsz/MemTotal
631 */
632 pmem_shift = BITS_PER_INT-11;
633 pmem_scale = UPSCALE*(1U<<(BITS_PER_INT-11)) / total_memory;
634 /* s->vsz is in kb. we want (s->vsz * pmem_scale) to never overflow */
635 while (pmem_scale >= 512) {
636 pmem_scale /= 4;
637 pmem_shift -= 2;
638 }
639 pmem_half = (1U << pmem_shift) / (ENABLE_FEATURE_TOP_DECIMALS ? 20 : 2);
640#if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
641 busy_jifs = cur_jif.busy - prev_jif.busy;
642 /* This happens if there were lots of short-lived processes
643 * between two top updates (e.g. compilation) */
644 if (total_pcpu < busy_jifs) total_pcpu = busy_jifs;
645
646 /*
647 * CPU% = s->pcpu/sum(s->pcpu) * busy_cpu_ticks/total_cpu_ticks
648 * (pcpu is delta of sys+user time between samples)
649 */
650 /* (cur_jif.xxx - prev_jif.xxx) and s->pcpu are
651 * in 0..~64000 range (HZ*update_interval).
652 * we assume that unsigned is at least 32-bit.
653 */
654 pcpu_shift = 6;
655 pcpu_scale = UPSCALE*64 * (uint16_t)busy_jifs;
656 if (pcpu_scale == 0)
657 pcpu_scale = 1;
658 while (pcpu_scale < (1U << (BITS_PER_INT-2))) {
659 pcpu_scale *= 4;
660 pcpu_shift += 2;
661 }
662 tmp_unsigned = (uint16_t)(cur_jif.total - prev_jif.total) * total_pcpu;
663 if (tmp_unsigned != 0)
664 pcpu_scale /= tmp_unsigned;
665 /* we want (s->pcpu * pcpu_scale) to never overflow */
666 while (pcpu_scale >= 1024) {
667 pcpu_scale /= 4;
668 pcpu_shift -= 2;
669 }
670 pcpu_half = (1U << pcpu_shift) / (ENABLE_FEATURE_TOP_DECIMALS ? 20 : 2);
671 /* printf(" pmem_scale=%u pcpu_scale=%u ", pmem_scale, pcpu_scale); */
672#endif
673
674 /* Ok, all preliminary data is ready, go through the list */
675 scr_width += 2; /* account for leading '\n' and trailing NUL */
676 if (lines_rem > ntop - G_scroll_ofs)
677 lines_rem = ntop - G_scroll_ofs;
678 s = top + G_scroll_ofs;
679 while (--lines_rem >= 0) {
680 unsigned col;
681 CALC_STAT(pmem, (s->vsz*pmem_scale + pmem_half) >> pmem_shift);
682#if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
683 CALC_STAT(pcpu, (s->pcpu*pcpu_scale + pcpu_half) >> pcpu_shift);
684#endif
685
686 if (s->vsz >= 100000)
687 sprintf(vsz_str_buf, "%6ldm", s->vsz/1024);
688 else
689 sprintf(vsz_str_buf, "%7lu", s->vsz);
690 /* PID PPID USER STAT VSZ %VSZ [%CPU] COMMAND */
691 col = snprintf(line_buf, scr_width,
692 "\n" "%5u%6u %-8.8s %s%s" FMT
693 IF_FEATURE_TOP_SMP_PROCESS(" %3d")
694 IF_FEATURE_TOP_CPU_USAGE_PERCENTAGE(FMT)
695 " ",
696 s->pid, s->ppid, get_cached_username(s->uid),
697 s->state, vsz_str_buf,
698 SHOW_STAT(pmem)
699 IF_FEATURE_TOP_SMP_PROCESS(, s->last_seen_on_cpu)
700 IF_FEATURE_TOP_CPU_USAGE_PERCENTAGE(, SHOW_STAT(pcpu))
701 );
702 if ((int)(col + 1) < scr_width)
703 read_cmdline(line_buf + col, scr_width - col, s->pid, s->comm);
704 fputs(line_buf, stdout);
705 /* printf(" %d/%d %lld/%lld", s->pcpu, total_pcpu,
706 cur_jif.busy - prev_jif.busy, cur_jif.total - prev_jif.total); */
707 s++;
708 }
709 /* printf(" %d", hist_iterations); */
710 bb_putchar(OPT_BATCH_MODE ? '\n' : '\r');
711 fflush_all();
712}
713#undef UPSCALE
714#undef SHOW_STAT
715#undef CALC_STAT
716#undef FMT
717
718static void clearmems(void)
719{
720 clear_username_cache();
721 free(top);
722 top = NULL;
723}
724
725#if ENABLE_FEATURE_USE_TERMIOS
726
727static void reset_term(void)
728{
729 if (!OPT_BATCH_MODE)
730 tcsetattr_stdin_TCSANOW(&initial_settings);
731 if (ENABLE_FEATURE_CLEAN_UP) {
732 clearmems();
733# if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
734 free(prev_hist);
735# endif
736 }
737}
738
739static void sig_catcher(int sig)
740{
741 reset_term();
742 kill_myself_with_sig(sig);
743}
744
745#endif /* FEATURE_USE_TERMIOS */
746
747/*
748 * TOPMEM support
749 */
750
751typedef unsigned long mem_t;
752
753typedef struct topmem_status_t {
754 unsigned pid;
755 char comm[COMM_LEN];
756 /* vsz doesn't count /dev/xxx mappings except /dev/zero */
757 mem_t vsz ;
758 mem_t vszrw ;
759 mem_t rss ;
760 mem_t rss_sh ;
761 mem_t dirty ;
762 mem_t dirty_sh;
763 mem_t stack ;
764} topmem_status_t;
765
766enum { NUM_SORT_FIELD = 7 };
767
768#define topmem ((topmem_status_t*)top)
769
770#if ENABLE_FEATURE_TOPMEM
771
772static int topmem_sort(char *a, char *b)
773{
774 int n;
775 mem_t l, r;
776
777 n = offsetof(topmem_status_t, vsz) + (sort_field * sizeof(mem_t));
778 l = *(mem_t*)(a + n);
779 r = *(mem_t*)(b + n);
780 if (l == r) {
781 l = ((topmem_status_t*)a)->dirty;
782 r = ((topmem_status_t*)b)->dirty;
783 }
784 /* We want to avoid unsigned->signed and truncation errors */
785 /* l>r: -1, l=r: 0, l<r: 1 */
786 n = (l > r) ? -1 : (l != r);
787 return inverted ? -n : n;
788}
789
790/* display header info (meminfo / loadavg) */
791static void display_topmem_header(int scr_width, int *lines_rem_p)
792{
793 unsigned long meminfo[MI_MAX];
794
795 parse_meminfo(meminfo);
796
797 snprintf(line_buf, LINE_BUF_SIZE,
798 "Mem total:%lu anon:%lu map:%lu free:%lu",
799 meminfo[MI_MEMTOTAL],
800 meminfo[MI_ANONPAGES],
801 meminfo[MI_MAPPED],
802 meminfo[MI_MEMFREE]);
803 printf(OPT_BATCH_MODE ? "%.*s\n" : "\033[H\033[J%.*s\n", scr_width, line_buf);
804
805 snprintf(line_buf, LINE_BUF_SIZE,
806 " slab:%lu buf:%lu cache:%lu dirty:%lu write:%lu",
807 meminfo[MI_SLAB],
808 meminfo[MI_BUFFERS],
809 meminfo[MI_CACHED],
810 meminfo[MI_DIRTY],
811 meminfo[MI_WRITEBACK]);
812 printf("%.*s\n", scr_width, line_buf);
813
814 snprintf(line_buf, LINE_BUF_SIZE,
815 "Swap total:%lu free:%lu", // TODO: % used?
816 meminfo[MI_SWAPTOTAL],
817 meminfo[MI_SWAPFREE]);
818 printf("%.*s\n", scr_width, line_buf);
819
820 (*lines_rem_p) -= 3;
821}
822
823static void ulltoa6_and_space(unsigned long long ul, char buf[6])
824{
825 /* see http://en.wikipedia.org/wiki/Tera */
826 smart_ulltoa5(ul, buf, " mgtpezy")[0] = ' ';
827}
828
829static NOINLINE void display_topmem_process_list(int lines_rem, int scr_width)
830{
831#define HDR_STR " PID VSZ VSZRW RSS (SHR) DIRTY (SHR) STACK"
832#define MIN_WIDTH sizeof(HDR_STR)
833 const topmem_status_t *s = topmem + G_scroll_ofs;
834 char *cp, ch;
835
836 display_topmem_header(scr_width, &lines_rem);
837
838 strcpy(line_buf, HDR_STR " COMMAND");
839 /* Mark the ^FIELD^ we sort by */
840 cp = &line_buf[5 + sort_field * 6];
841 ch = "^_"[inverted];
842 cp[6] = ch;
843 do *cp++ = ch; while (*cp == ' ');
844
845 printf(OPT_BATCH_MODE ? "%.*s" : "\e[7m%.*s\e[0m", scr_width, line_buf);
846 lines_rem--;
847
848 if (lines_rem > ntop - G_scroll_ofs)
849 lines_rem = ntop - G_scroll_ofs;
850 while (--lines_rem >= 0) {
851 /* PID VSZ VSZRW RSS (SHR) DIRTY (SHR) COMMAND */
852 ulltoa6_and_space(s->pid , &line_buf[0*6]);
853 ulltoa6_and_space(s->vsz , &line_buf[1*6]);
854 ulltoa6_and_space(s->vszrw , &line_buf[2*6]);
855 ulltoa6_and_space(s->rss , &line_buf[3*6]);
856 ulltoa6_and_space(s->rss_sh , &line_buf[4*6]);
857 ulltoa6_and_space(s->dirty , &line_buf[5*6]);
858 ulltoa6_and_space(s->dirty_sh, &line_buf[6*6]);
859 ulltoa6_and_space(s->stack , &line_buf[7*6]);
860 line_buf[8*6] = '\0';
861 if (scr_width > (int)MIN_WIDTH) {
862 read_cmdline(&line_buf[8*6], scr_width - MIN_WIDTH, s->pid, s->comm);
863 }
864 printf("\n""%.*s", scr_width, line_buf);
865 s++;
866 }
867 bb_putchar(OPT_BATCH_MODE ? '\n' : '\r');
868 fflush_all();
869#undef HDR_STR
870#undef MIN_WIDTH
871}
872
873#else
874void display_topmem_process_list(int lines_rem, int scr_width);
875int topmem_sort(char *a, char *b);
876#endif /* TOPMEM */
877
878/*
879 * end TOPMEM support
880 */
881
882enum {
883 TOP_MASK = 0
884 | PSSCAN_PID
885 | PSSCAN_PPID
886 | PSSCAN_VSZ
887 | PSSCAN_STIME
888 | PSSCAN_UTIME
889 | PSSCAN_STATE
890 | PSSCAN_COMM
891 | PSSCAN_CPU
892 | PSSCAN_UIDGID,
893 TOPMEM_MASK = 0
894 | PSSCAN_PID
895 | PSSCAN_SMAPS
896 | PSSCAN_COMM,
897 EXIT_MASK = (unsigned)-1,
898};
899
900#if ENABLE_FEATURE_USE_TERMIOS
901static unsigned handle_input(unsigned scan_mask, unsigned interval)
902{
903 if (option_mask32 & OPT_EOF) {
904 /* EOF on stdin ("top </dev/null") */
905 sleep(interval);
906 return scan_mask;
907 }
908
909 while (1) {
910 int32_t c;
911
912 c = read_key(STDIN_FILENO, G.kbd_input, interval * 1000);
913 if (c == -1 && errno != EAGAIN) {
914 /* error/EOF */
915 option_mask32 |= OPT_EOF;
916 break;
917 }
918 interval = 0;
919
920 if (c == initial_settings.c_cc[VINTR])
921 return EXIT_MASK;
922 if (c == initial_settings.c_cc[VEOF])
923 return EXIT_MASK;
924
925 if (c == KEYCODE_UP) {
926 G_scroll_ofs--;
927 goto normalize_ofs;
928 }
929 if (c == KEYCODE_DOWN) {
930 G_scroll_ofs++;
931 goto normalize_ofs;
932 }
933 if (c == KEYCODE_HOME) {
934 G_scroll_ofs = 0;
935 break;
936 }
937 if (c == KEYCODE_END) {
938 G_scroll_ofs = ntop - G.lines / 2;
939 goto normalize_ofs;
940 }
941 if (c == KEYCODE_PAGEUP) {
942 G_scroll_ofs -= G.lines / 2;
943 goto normalize_ofs;
944 }
945 if (c == KEYCODE_PAGEDOWN) {
946 G_scroll_ofs += G.lines / 2;
947 normalize_ofs:
948 if (G_scroll_ofs >= ntop)
949 G_scroll_ofs = ntop - 1;
950 if (G_scroll_ofs < 0)
951 G_scroll_ofs = 0;
952 break;
953 }
954
955 c |= 0x20; /* lowercase */
956 if (c == 'q')
957 return EXIT_MASK;
958
959 if (c == 'n') {
960 IF_FEATURE_TOPMEM(scan_mask = TOP_MASK;)
961 sort_function[0] = pid_sort;
962 continue;
963 }
964 if (c == 'm') {
965 IF_FEATURE_TOPMEM(scan_mask = TOP_MASK;)
966 sort_function[0] = mem_sort;
967# if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
968 sort_function[1] = pcpu_sort;
969 sort_function[2] = time_sort;
970# endif
971 continue;
972 }
973# if ENABLE_FEATURE_SHOW_THREADS
974 if (c == 'h'
975 IF_FEATURE_TOPMEM(&& scan_mask != TOPMEM_MASK)
976 ) {
977 scan_mask ^= PSSCAN_TASKS;
978 continue;
979 }
980# endif
981# if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
982 if (c == 'p') {
983 IF_FEATURE_TOPMEM(scan_mask = TOP_MASK;)
984 sort_function[0] = pcpu_sort;
985 sort_function[1] = mem_sort;
986 sort_function[2] = time_sort;
987 continue;
988 }
989 if (c == 't') {
990 IF_FEATURE_TOPMEM(scan_mask = TOP_MASK;)
991 sort_function[0] = time_sort;
992 sort_function[1] = mem_sort;
993 sort_function[2] = pcpu_sort;
994 continue;
995 }
996# if ENABLE_FEATURE_TOPMEM
997 if (c == 's') {
998 scan_mask = TOPMEM_MASK;
999 free(prev_hist);
1000 prev_hist = NULL;
1001 prev_hist_count = 0;
1002 sort_field = (sort_field + 1) % NUM_SORT_FIELD;
1003 continue;
1004 }
1005# endif
1006 if (c == 'r') {
1007 inverted ^= 1;
1008 continue;
1009 }
1010# if ENABLE_FEATURE_TOP_SMP_CPU
1011 /* procps-2.0.18 uses 'C', 3.2.7 uses '1' */
1012 if (c == 'c' || c == '1') {
1013 /* User wants to toggle per cpu <> aggregate */
1014 if (smp_cpu_info) {
1015 free(cpu_prev_jif);
1016 free(cpu_jif);
1017 cpu_jif = &cur_jif;
1018 cpu_prev_jif = &prev_jif;
1019 } else {
1020 /* Prepare for xrealloc() */
1021 cpu_jif = cpu_prev_jif = NULL;
1022 }
1023 num_cpus = 0;
1024 smp_cpu_info = !smp_cpu_info;
1025 get_jiffy_counts();
1026 continue;
1027 }
1028# endif
1029# endif
1030 break; /* unknown key -> force refresh */
1031 }
1032
1033 return scan_mask;
1034}
1035#endif
1036
1037//usage:#if ENABLE_FEATURE_SHOW_THREADS || ENABLE_FEATURE_TOP_SMP_CPU
1038//usage:# define IF_SHOW_THREADS_OR_TOP_SMP(...) __VA_ARGS__
1039//usage:#else
1040//usage:# define IF_SHOW_THREADS_OR_TOP_SMP(...)
1041//usage:#endif
1042//usage:#define top_trivial_usage
1043//usage: "[-b] [-nCOUNT] [-dSECONDS]" IF_FEATURE_TOPMEM(" [-m]")
1044//usage:#define top_full_usage "\n\n"
1045//usage: "Provide a view of process activity in real time."
1046//usage: "\n""Read the status of all processes from /proc each SECONDS"
1047//usage: "\n""and display a screenful of them."
1048//usage: "\n""Keys:"
1049//usage: "\n"" N/M"
1050//usage: IF_FEATURE_TOP_CPU_USAGE_PERCENTAGE("/P")
1051//usage: IF_FEATURE_TOP_CPU_USAGE_PERCENTAGE("/T")
1052//usage: ": " IF_FEATURE_TOPMEM("show CPU usage, ") "sort by pid/mem"
1053//usage: IF_FEATURE_TOP_CPU_USAGE_PERCENTAGE("/cpu")
1054//usage: IF_FEATURE_TOP_CPU_USAGE_PERCENTAGE("/time")
1055//usage: IF_FEATURE_TOPMEM(
1056//usage: "\n"" S: show memory"
1057//usage: )
1058//usage: "\n"" R: reverse sort"
1059//usage: IF_SHOW_THREADS_OR_TOP_SMP(
1060//usage: "\n"" "
1061//usage: IF_FEATURE_SHOW_THREADS("H: toggle threads")
1062//usage: IF_FEATURE_SHOW_THREADS(IF_FEATURE_TOP_SMP_CPU(", "))
1063//usage: IF_FEATURE_TOP_SMP_CPU("1: toggle SMP")
1064//usage: )
1065//usage: "\n"" Q,^C: exit"
1066//usage: "\n"
1067//usage: "\n""Options:"
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
1086int top_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
1087int 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 return EXIT_SUCCESS;
1262}
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