1 /* vi: set sw=4 ts=4: */
3 * A tiny 'top' utility.
5 * This is written specifically for the linux /proc/<PID>/stat(m)
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
13 * - At startup this changes to /proc, all the reads are then
16 * (C) Eero Tamminen <oak at welho dot com>
18 * Rewritten by Vladimir Oleynik (C) 2002 <dzo@simtreas.ru>
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
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
31 * Licensed under GPLv2, see file LICENSE in this source tree.
33 /* How to snapshot /proc for debugging top problems:
34 * for f in /proc/[0-9]*""/stat; do
39 * cp /proc/stat /proc/meminfo /proc/loadavg .
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
49 * cp stat meminfo loadavg proc
50 * chroot . ./top -bn1 >top1.out
56 typedef struct top_status_t {
58 #if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
60 unsigned pcpu; /* delta of ticks */
66 #if ENABLE_FEATURE_TOP_SMP_PROCESS
71 typedef struct jiffy_counts_t {
72 /* Linux 2.4.x has only first four */
73 unsigned long long usr, nic, sys, idle;
74 unsigned long long iowait, irq, softirq, steal;
75 unsigned long long total;
76 unsigned long long busy;
79 /* This structure stores some critical information from one frame to
80 the next. Used for finding deltas. */
81 typedef struct save_hist {
86 typedef int (*cmp_funcp)(top_status_t *P, top_status_t *Q);
89 enum { SORT_DEPTH = 3 };
96 #if ENABLE_FEATURE_TOPMEM
99 #if ENABLE_FEATURE_TOP_SMP_CPU
100 smallint smp_cpu_info; /* one/many cpu info lines? */
102 #if ENABLE_FEATURE_USE_TERMIOS
103 struct termios initial_settings;
105 #if !ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
106 cmp_funcp sort_function[1];
108 cmp_funcp sort_function[SORT_DEPTH];
109 struct save_hist *prev_hist;
111 jiffy_counts_t cur_jif, prev_jif;
112 /* int hist_iterations; */
114 /* unsigned long total_vsz; */
116 #if ENABLE_FEATURE_TOP_SMP_CPU
117 /* Per CPU samples: current and last */
118 jiffy_counts_t *cpu_jif, *cpu_prev_jif;
122 }; //FIX_ALIASING; - large code growth
123 enum { LINE_BUF_SIZE = COMMON_BUFSIZE - offsetof(struct globals, line_buf) };
124 #define G (*(struct globals*)&bb_common_bufsiz1)
125 struct BUG_bad_size {
126 char BUG_G_too_big[sizeof(G) <= COMMON_BUFSIZE ? 1 : -1];
127 char BUG_line_buf_too_small[LINE_BUF_SIZE > 80 ? 1 : -1];
129 #define INIT_G() do { } while (0)
131 #define ntop (G.ntop )
132 #define sort_field (G.sort_field )
133 #define inverted (G.inverted )
134 #define smp_cpu_info (G.smp_cpu_info )
135 #define initial_settings (G.initial_settings )
136 #define sort_function (G.sort_function )
137 #define prev_hist (G.prev_hist )
138 #define prev_hist_count (G.prev_hist_count )
139 #define cur_jif (G.cur_jif )
140 #define prev_jif (G.prev_jif )
141 #define cpu_jif (G.cpu_jif )
142 #define cpu_prev_jif (G.cpu_prev_jif )
143 #define num_cpus (G.num_cpus )
144 #define total_pcpu (G.total_pcpu )
145 #define line_buf (G.line_buf )
152 OPT_EOF = (1 << 4), /* pseudo: "we saw EOF in stdin" */
154 #define OPT_BATCH_MODE (option_mask32 & OPT_b)
157 #if ENABLE_FEATURE_USE_TERMIOS
158 static int pid_sort(top_status_t *P, top_status_t *Q)
160 /* Buggy wrt pids with high bit set */
161 /* (linux pids are in [1..2^15-1]) */
162 return (Q->pid - P->pid);
166 static int mem_sort(top_status_t *P, top_status_t *Q)
168 /* We want to avoid unsigned->signed and truncation errors */
169 if (Q->vsz < P->vsz) return -1;
170 return Q->vsz != P->vsz; /* 0 if ==, 1 if > */
174 #if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
176 static int pcpu_sort(top_status_t *P, top_status_t *Q)
178 /* Buggy wrt ticks with high bit set */
179 /* Affects only processes for which ticks overflow */
180 return (int)Q->pcpu - (int)P->pcpu;
183 static int time_sort(top_status_t *P, top_status_t *Q)
185 /* We want to avoid unsigned->signed and truncation errors */
186 if (Q->ticks < P->ticks) return -1;
187 return Q->ticks != P->ticks; /* 0 if ==, 1 if > */
190 static int mult_lvl_cmp(void* a, void* b)
194 for (i = 0; i < SORT_DEPTH; i++) {
195 cmp_val = (*sort_function[i])(a, b);
199 return inverted ? -cmp_val : cmp_val;
202 static NOINLINE int read_cpu_jiffy(FILE *fp, jiffy_counts_t *p_jif)
204 #if !ENABLE_FEATURE_TOP_SMP_CPU
205 static const char fmt[] = "cpu %llu %llu %llu %llu %llu %llu %llu %llu";
207 static const char fmt[] = "cp%*s %llu %llu %llu %llu %llu %llu %llu %llu";
211 if (!fgets(line_buf, LINE_BUF_SIZE, fp) || line_buf[0] != 'c' /* not "cpu" */)
213 ret = sscanf(line_buf, fmt,
214 &p_jif->usr, &p_jif->nic, &p_jif->sys, &p_jif->idle,
215 &p_jif->iowait, &p_jif->irq, &p_jif->softirq,
218 p_jif->total = p_jif->usr + p_jif->nic + p_jif->sys + p_jif->idle
219 + p_jif->iowait + p_jif->irq + p_jif->softirq + p_jif->steal;
220 /* procps 2.x does not count iowait as busy time */
221 p_jif->busy = p_jif->total - p_jif->idle - p_jif->iowait;
227 static void get_jiffy_counts(void)
229 FILE* fp = xfopen_for_read("stat");
231 /* We need to parse cumulative counts even if SMP CPU display is on,
232 * they are used to calculate per process CPU% */
234 if (read_cpu_jiffy(fp, &cur_jif) < 4)
235 bb_error_msg_and_die("can't read /proc/stat");
237 #if !ENABLE_FEATURE_TOP_SMP_CPU
247 /* First time here. How many CPUs?
248 * There will be at least 1 /proc/stat line with cpu%d
251 cpu_jif = xrealloc_vector(cpu_jif, 1, num_cpus);
252 if (read_cpu_jiffy(fp, &cpu_jif[num_cpus]) <= 4)
256 if (num_cpus == 0) /* /proc/stat with only "cpu ..." line?! */
259 cpu_prev_jif = xzalloc(sizeof(cpu_prev_jif[0]) * num_cpus);
261 /* Otherwise the first per cpu display shows all 100% idles */
263 } else { /* Non first time invocation */
267 /* First switch the sample pointers: no need to copy */
269 cpu_prev_jif = cpu_jif;
272 /* Get the new samples */
273 for (i = 0; i < num_cpus; i++)
274 read_cpu_jiffy(fp, &cpu_jif[i]);
280 static void do_stats(void)
285 struct save_hist *new_hist;
290 new_hist = xmalloc(sizeof(new_hist[0]) * ntop);
292 * Make a pass through the data to get stats.
294 /* hist_iterations = 0; */
296 for (n = 0; n < ntop; n++) {
300 * Calculate time in cur process. Time is sum of user time
304 new_hist[n].ticks = cur->ticks;
305 new_hist[n].pid = pid;
307 /* find matching entry from previous pass */
309 /* do not start at index 0, continue at last used one
310 * (brought hist_iterations from ~14000 down to 172) */
312 if (prev_hist_count) do {
313 if (prev_hist[i].pid == pid) {
314 cur->pcpu = cur->ticks - prev_hist[i].ticks;
315 total_pcpu += cur->pcpu;
318 i = (i+1) % prev_hist_count;
319 /* hist_iterations++; */
320 } while (i != last_i);
321 /* total_vsz += cur->vsz; */
325 * Save cur frame's information.
328 prev_hist = new_hist;
329 prev_hist_count = ntop;
332 #endif /* FEATURE_TOP_CPU_USAGE_PERCENTAGE */
334 #if ENABLE_FEATURE_TOP_CPU_GLOBAL_PERCENTS && ENABLE_FEATURE_TOP_DECIMALS
335 /* formats 7 char string (8 with terminating NUL) */
336 static char *fmt_100percent_8(char pbuf[8], unsigned value, unsigned total)
339 if (value >= total) { /* 100% ? */
340 strcpy(pbuf, " 100% ");
343 /* else generate " [N/space]N.N% " string */
344 value = 1000 * value / total;
348 pbuf[1] = t ? t + '0' : ' ';
349 pbuf[2] = '0' + (value / 10);
351 pbuf[4] = '0' + (value % 10);
359 #if ENABLE_FEATURE_TOP_CPU_GLOBAL_PERCENTS
360 static void display_cpus(int scr_width, char *scrbuf, int *lines_rem_p)
363 * xxx% = (cur_jif.xxx - prev_jif.xxx) / (cur_jif.total - prev_jif.total) * 100%
366 jiffy_counts_t *p_jif, *p_prev_jif;
368 # if ENABLE_FEATURE_TOP_SMP_CPU
372 /* using (unsigned) casts to make operations cheaper */
373 # define CALC_TOTAL_DIFF do { \
374 total_diff = (unsigned)(p_jif->total - p_prev_jif->total); \
375 if (total_diff == 0) total_diff = 1; \
378 # if ENABLE_FEATURE_TOP_DECIMALS
379 # define CALC_STAT(xxx) char xxx[8]
380 # define SHOW_STAT(xxx) fmt_100percent_8(xxx, (unsigned)(p_jif->xxx - p_prev_jif->xxx), total_diff)
383 # define CALC_STAT(xxx) unsigned xxx = 100 * (unsigned)(p_jif->xxx - p_prev_jif->xxx) / total_diff
384 # define SHOW_STAT(xxx) xxx
385 # define FMT "%4u%% "
388 # if !ENABLE_FEATURE_TOP_SMP_CPU
392 p_prev_jif = &prev_jif;
394 /* Loop thru CPU(s) */
395 n_cpu_lines = smp_cpu_info ? num_cpus : 1;
396 if (n_cpu_lines > *lines_rem_p)
397 n_cpu_lines = *lines_rem_p;
399 for (i = 0; i < n_cpu_lines; i++) {
401 p_prev_jif = &cpu_prev_jif[i];
405 { /* Need a block: CALC_STAT are declarations */
413 /*CALC_STAT(steal);*/
415 snprintf(scrbuf, scr_width,
416 /* Barely fits in 79 chars when in "decimals" mode. */
417 # if ENABLE_FEATURE_TOP_SMP_CPU
418 "CPU%s:"FMT"usr"FMT"sys"FMT"nic"FMT"idle"FMT"io"FMT"irq"FMT"sirq",
419 (smp_cpu_info ? utoa(i) : ""),
421 "CPU:"FMT"usr"FMT"sys"FMT"nic"FMT"idle"FMT"io"FMT"irq"FMT"sirq",
423 SHOW_STAT(usr), SHOW_STAT(sys), SHOW_STAT(nic), SHOW_STAT(idle),
424 SHOW_STAT(iowait), SHOW_STAT(irq), SHOW_STAT(softirq)
425 /*, SHOW_STAT(steal) - what is this 'steal' thing? */
426 /* I doubt anyone wants to know it */
436 #else /* !ENABLE_FEATURE_TOP_CPU_GLOBAL_PERCENTS */
437 # define display_cpus(scr_width, scrbuf, lines_rem) ((void)0)
440 static unsigned long display_header(int scr_width, int *lines_rem_p)
445 unsigned long total, used, mfree, shared, buffers, cached;
447 /* read memory info */
448 fp = xfopen_for_read("meminfo");
451 * Old kernels (such as 2.4.x) had a nice summary of memory info that
452 * we could parse, however this is gone entirely in 2.6. Try parsing
453 * the old way first, and if that fails, parse each field manually.
455 * First, we read in the first line. Old kernels will have bogus
456 * strings we don't care about, whereas new kernels will start right
460 if (fscanf(fp, "MemTotal: %lu %s\n", &total, buf) != 2) {
461 fgets(buf, sizeof(buf), fp); /* skip first line */
463 fscanf(fp, "Mem: %lu %lu %lu %lu %lu %lu",
464 &total, &used, &mfree, &shared, &buffers, &cached);
465 /* convert to kilobytes */
474 * Revert to manual parsing, which incidentally already has the
475 * sizes in kilobytes. This should be safe for both 2.4 and
478 fscanf(fp, "MemFree: %lu %s\n", &mfree, buf);
481 * MemShared: is no longer present in 2.6. Report this as 0,
482 * to maintain consistent behavior with normal procps.
484 if (fscanf(fp, "MemShared: %lu %s\n", &shared, buf) != 2)
487 fscanf(fp, "Buffers: %lu %s\n", &buffers, buf);
488 fscanf(fp, "Cached: %lu %s\n", &cached, buf);
490 used = total - mfree;
494 /* output memory info */
495 if (scr_width > (int)sizeof(scrbuf))
496 scr_width = sizeof(scrbuf);
497 snprintf(scrbuf, scr_width,
498 "Mem: %luK used, %luK free, %luK shrd, %luK buff, %luK cached",
499 used, mfree, shared, buffers, cached);
500 /* go to top & clear to the end of screen */
501 printf(OPT_BATCH_MODE ? "%s\n" : "\033[H\033[J%s\n", scrbuf);
504 /* Display CPU time split as percentage of total time
505 * This displays either a cumulative line or one line per CPU
507 display_cpus(scr_width, scrbuf, lines_rem_p);
509 /* read load average as a string */
511 open_read_close("loadavg", buf, sizeof(buf) - 1);
512 buf[sizeof(buf) - 1] = '\n';
513 *strchr(buf, '\n') = '\0';
514 snprintf(scrbuf, scr_width, "Load average: %s", buf);
521 static NOINLINE void display_process_list(int lines_rem, int scr_width)
524 BITS_PER_INT = sizeof(int) * 8
529 unsigned long total_memory = display_header(scr_width, &lines_rem); /* or use total_vsz? */
530 /* xxx_shift and xxx_scale variables allow us to replace
531 * expensive divides with multiply and shift */
532 unsigned pmem_shift, pmem_scale, pmem_half;
533 #if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
534 unsigned tmp_unsigned;
535 unsigned pcpu_shift, pcpu_scale, pcpu_half;
539 /* what info of the processes is shown */
540 printf(OPT_BATCH_MODE ? "%.*s" : "\033[7m%.*s\033[0m", scr_width,
541 " PID PPID USER STAT VSZ %VSZ"
542 IF_FEATURE_TOP_SMP_PROCESS(" CPU")
543 IF_FEATURE_TOP_CPU_USAGE_PERCENTAGE(" %CPU")
547 #if ENABLE_FEATURE_TOP_DECIMALS
548 # define UPSCALE 1000
549 # define CALC_STAT(name, val) div_t name = div((val), 10)
550 # define SHOW_STAT(name) name.quot, '0'+name.rem
551 # define FMT "%3u.%c"
554 # define CALC_STAT(name, val) unsigned name = (val)
555 # define SHOW_STAT(name) name
559 * %VSZ = s->vsz/MemTotal
561 pmem_shift = BITS_PER_INT-11;
562 pmem_scale = UPSCALE*(1U<<(BITS_PER_INT-11)) / total_memory;
563 /* s->vsz is in kb. we want (s->vsz * pmem_scale) to never overflow */
564 while (pmem_scale >= 512) {
568 pmem_half = (1U << pmem_shift) / (ENABLE_FEATURE_TOP_DECIMALS ? 20 : 2);
569 #if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
570 busy_jifs = cur_jif.busy - prev_jif.busy;
571 /* This happens if there were lots of short-lived processes
572 * between two top updates (e.g. compilation) */
573 if (total_pcpu < busy_jifs) total_pcpu = busy_jifs;
576 * CPU% = s->pcpu/sum(s->pcpu) * busy_cpu_ticks/total_cpu_ticks
577 * (pcpu is delta of sys+user time between samples)
579 /* (cur_jif.xxx - prev_jif.xxx) and s->pcpu are
580 * in 0..~64000 range (HZ*update_interval).
581 * we assume that unsigned is at least 32-bit.
584 pcpu_scale = UPSCALE*64 * (uint16_t)busy_jifs;
587 while (pcpu_scale < (1U << (BITS_PER_INT-2))) {
591 tmp_unsigned = (uint16_t)(cur_jif.total - prev_jif.total) * total_pcpu;
592 if (tmp_unsigned != 0)
593 pcpu_scale /= tmp_unsigned;
594 /* we want (s->pcpu * pcpu_scale) to never overflow */
595 while (pcpu_scale >= 1024) {
599 pcpu_half = (1U << pcpu_shift) / (ENABLE_FEATURE_TOP_DECIMALS ? 20 : 2);
600 /* printf(" pmem_scale=%u pcpu_scale=%u ", pmem_scale, pcpu_scale); */
603 /* Ok, all preliminary data is ready, go through the list */
604 scr_width += 2; /* account for leading '\n' and trailing NUL */
605 if (lines_rem > ntop)
608 while (--lines_rem >= 0) {
610 CALC_STAT(pmem, (s->vsz*pmem_scale + pmem_half) >> pmem_shift);
611 #if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
612 CALC_STAT(pcpu, (s->pcpu*pcpu_scale + pcpu_half) >> pcpu_shift);
615 if (s->vsz >= 100000)
616 sprintf(vsz_str_buf, "%6ldm", s->vsz/1024);
618 sprintf(vsz_str_buf, "%7ld", s->vsz);
619 /* PID PPID USER STAT VSZ %VSZ [%CPU] COMMAND */
620 col = snprintf(line_buf, scr_width,
621 "\n" "%5u%6u %-8.8s %s%s" FMT
622 IF_FEATURE_TOP_SMP_PROCESS(" %3d")
623 IF_FEATURE_TOP_CPU_USAGE_PERCENTAGE(FMT)
625 s->pid, s->ppid, get_cached_username(s->uid),
626 s->state, vsz_str_buf,
628 IF_FEATURE_TOP_SMP_PROCESS(, s->last_seen_on_cpu)
629 IF_FEATURE_TOP_CPU_USAGE_PERCENTAGE(, SHOW_STAT(pcpu))
631 if ((int)(col + 1) < scr_width)
632 read_cmdline(line_buf + col, scr_width - col, s->pid, s->comm);
633 fputs(line_buf, stdout);
634 /* printf(" %d/%d %lld/%lld", s->pcpu, total_pcpu,
635 cur_jif.busy - prev_jif.busy, cur_jif.total - prev_jif.total); */
638 /* printf(" %d", hist_iterations); */
639 bb_putchar(OPT_BATCH_MODE ? '\n' : '\r');
647 static void clearmems(void)
649 clear_username_cache();
655 #if ENABLE_FEATURE_USE_TERMIOS
657 static void reset_term(void)
659 tcsetattr_stdin_TCSANOW(&initial_settings);
660 if (ENABLE_FEATURE_CLEAN_UP) {
662 # if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
668 static void sig_catcher(int sig UNUSED_PARAM)
674 #endif /* FEATURE_USE_TERMIOS */
680 typedef unsigned long mem_t;
682 typedef struct topmem_status_t {
685 /* vsz doesn't count /dev/xxx mappings except /dev/zero */
695 enum { NUM_SORT_FIELD = 7 };
697 #define topmem ((topmem_status_t*)top)
699 #if ENABLE_FEATURE_TOPMEM
701 static int topmem_sort(char *a, char *b)
706 n = offsetof(topmem_status_t, vsz) + (sort_field * sizeof(mem_t));
707 l = *(mem_t*)(a + n);
708 r = *(mem_t*)(b + n);
710 l = ((topmem_status_t*)a)->dirty;
711 r = ((topmem_status_t*)b)->dirty;
713 /* We want to avoid unsigned->signed and truncation errors */
714 /* l>r: -1, l=r: 0, l<r: 1 */
715 n = (l > r) ? -1 : (l != r);
716 return inverted ? -n : n;
719 /* display header info (meminfo / loadavg) */
720 static void display_topmem_header(int scr_width, int *lines_rem_p)
723 TOTAL = 0, MFREE, BUF, CACHE,
724 SWAPTOTAL, SWAPFREE, DIRTY,
725 MWRITE, ANON, MAP, SLAB,
728 static const char match[NUM_FIELDS][12] = {
729 "\x09" "MemTotal:", // TOTAL
730 "\x08" "MemFree:", // MFREE
731 "\x08" "Buffers:", // BUF
732 "\x07" "Cached:", // CACHE
733 "\x0a" "SwapTotal:", // SWAPTOTAL
734 "\x09" "SwapFree:", // SWAPFREE
735 "\x06" "Dirty:", // DIRTY
736 "\x0a" "Writeback:", // MWRITE
737 "\x0a" "AnonPages:", // ANON
738 "\x07" "Mapped:", // MAP
739 "\x05" "Slab:", // SLAB
741 char meminfo_buf[4 * 1024];
742 const char *Z[NUM_FIELDS];
746 for (i = 0; i < NUM_FIELDS; i++)
749 /* read memory info */
750 sz = open_read_close("meminfo", meminfo_buf, sizeof(meminfo_buf) - 1);
752 char *p = meminfo_buf;
753 meminfo_buf[sz] = '\0';
754 /* Note that fields always appear in the match[] order */
755 for (i = 0; i < NUM_FIELDS; i++) {
756 char *found = strstr(p, match[i] + 1);
758 /* Cut "NNNN" out of " NNNN kb" */
759 char *s = skip_whitespace(found + match[i][0]);
760 p = skip_non_whitespace(s);
767 snprintf(line_buf, LINE_BUF_SIZE,
768 "Mem total:%s anon:%s map:%s free:%s",
769 Z[TOTAL], Z[ANON], Z[MAP], Z[MFREE]);
770 printf(OPT_BATCH_MODE ? "%.*s\n" : "\033[H\033[J%.*s\n", scr_width, line_buf);
772 snprintf(line_buf, LINE_BUF_SIZE,
773 " slab:%s buf:%s cache:%s dirty:%s write:%s",
774 Z[SLAB], Z[BUF], Z[CACHE], Z[DIRTY], Z[MWRITE]);
775 printf("%.*s\n", scr_width, line_buf);
777 snprintf(line_buf, LINE_BUF_SIZE,
778 "Swap total:%s free:%s", // TODO: % used?
779 Z[SWAPTOTAL], Z[SWAPFREE]);
780 printf("%.*s\n", scr_width, line_buf);
785 static void ulltoa6_and_space(unsigned long long ul, char buf[6])
787 /* see http://en.wikipedia.org/wiki/Tera */
788 smart_ulltoa5(ul, buf, " mgtpezy");
792 static NOINLINE void display_topmem_process_list(int lines_rem, int scr_width)
794 #define HDR_STR " PID VSZ VSZRW RSS (SHR) DIRTY (SHR) STACK"
795 #define MIN_WIDTH sizeof(HDR_STR)
796 const topmem_status_t *s = topmem;
798 display_topmem_header(scr_width, &lines_rem);
799 strcpy(line_buf, HDR_STR " COMMAND");
800 line_buf[11 + sort_field * 6] = "^_"[inverted];
801 printf(OPT_BATCH_MODE ? "%.*s" : "\e[7m%.*s\e[0m", scr_width, line_buf);
804 if (lines_rem > ntop)
806 while (--lines_rem >= 0) {
807 /* PID VSZ VSZRW RSS (SHR) DIRTY (SHR) COMMAND */
808 ulltoa6_and_space(s->pid , &line_buf[0*6]);
809 ulltoa6_and_space(s->vsz , &line_buf[1*6]);
810 ulltoa6_and_space(s->vszrw , &line_buf[2*6]);
811 ulltoa6_and_space(s->rss , &line_buf[3*6]);
812 ulltoa6_and_space(s->rss_sh , &line_buf[4*6]);
813 ulltoa6_and_space(s->dirty , &line_buf[5*6]);
814 ulltoa6_and_space(s->dirty_sh, &line_buf[6*6]);
815 ulltoa6_and_space(s->stack , &line_buf[7*6]);
816 line_buf[8*6] = '\0';
817 if (scr_width > (int)MIN_WIDTH) {
818 read_cmdline(&line_buf[8*6], scr_width - MIN_WIDTH, s->pid, s->comm);
820 printf("\n""%.*s", scr_width, line_buf);
823 bb_putchar(OPT_BATCH_MODE ? '\n' : '\r');
830 void display_topmem_process_list(int lines_rem, int scr_width);
831 int topmem_sort(char *a, char *b);
853 EXIT_MASK = (unsigned)-1,
856 #if ENABLE_FEATURE_USE_TERMIOS
857 static unsigned handle_input(unsigned scan_mask, unsigned interval)
860 struct pollfd pfd[1];
863 pfd[0].events = POLLIN;
866 if (safe_poll(pfd, 1, interval * 1000) <= 0)
870 if (safe_read(STDIN_FILENO, &c, 1) != 1) { /* error/EOF? */
871 option_mask32 |= OPT_EOF;
875 if (c == initial_settings.c_cc[VINTR])
877 if (c == initial_settings.c_cc[VEOF])
879 c |= 0x20; /* lowercase */
884 IF_FEATURE_TOPMEM(scan_mask = TOP_MASK;)
885 sort_function[0] = pid_sort;
889 IF_FEATURE_TOPMEM(scan_mask = TOP_MASK;)
890 sort_function[0] = mem_sort;
891 # if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
892 sort_function[1] = pcpu_sort;
893 sort_function[2] = time_sort;
897 # if ENABLE_FEATURE_SHOW_THREADS
899 IF_FEATURE_TOPMEM(&& scan_mask != TOPMEM_MASK)
901 scan_mask ^= PSSCAN_TASKS;
905 # if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
907 IF_FEATURE_TOPMEM(scan_mask = TOP_MASK;)
908 sort_function[0] = pcpu_sort;
909 sort_function[1] = mem_sort;
910 sort_function[2] = time_sort;
914 IF_FEATURE_TOPMEM(scan_mask = TOP_MASK;)
915 sort_function[0] = time_sort;
916 sort_function[1] = mem_sort;
917 sort_function[2] = pcpu_sort;
920 # if ENABLE_FEATURE_TOPMEM
922 scan_mask = TOPMEM_MASK;
926 sort_field = (sort_field + 1) % NUM_SORT_FIELD;
934 # if ENABLE_FEATURE_TOP_SMP_CPU
935 /* procps-2.0.18 uses 'C', 3.2.7 uses '1' */
936 if (c == 'c' || c == '1') {
937 /* User wants to toggle per cpu <> aggregate */
942 cpu_prev_jif = &prev_jif;
944 /* Prepare for xrealloc() */
945 cpu_jif = cpu_prev_jif = NULL;
948 smp_cpu_info = !smp_cpu_info;
954 break; /* unknown key -> force refresh */
961 //usage:#if ENABLE_FEATURE_SHOW_THREADS || ENABLE_FEATURE_TOP_SMP_CPU
962 //usage:# define IF_SHOW_THREADS_OR_TOP_SMP(...) __VA_ARGS__
964 //usage:# define IF_SHOW_THREADS_OR_TOP_SMP(...)
966 //usage:#define top_trivial_usage
967 //usage: "[-b] [-nCOUNT] [-dSECONDS]" IF_FEATURE_TOPMEM(" [-m]")
968 //usage:#define top_full_usage "\n\n"
969 //usage: "Provide a view of process activity in real time."
970 //usage: "\n""Read the status of all processes from /proc each SECONDS"
971 //usage: "\n""and display a screenful of them."
974 //usage: IF_FEATURE_TOP_CPU_USAGE_PERCENTAGE("/P")
975 //usage: IF_FEATURE_TOP_CPU_USAGE_PERCENTAGE("/T")
976 //usage: ": " IF_FEATURE_TOPMEM("show CPU usage, ") "sort by pid/mem"
977 //usage: IF_FEATURE_TOP_CPU_USAGE_PERCENTAGE("/cpu")
978 //usage: IF_FEATURE_TOP_CPU_USAGE_PERCENTAGE("/time")
979 //usage: IF_FEATURE_TOPMEM(
980 //usage: "\n"" S: show memory"
982 //usage: "\n"" R: reverse sort"
983 //usage: IF_SHOW_THREADS_OR_TOP_SMP(
985 //usage: IF_FEATURE_SHOW_THREADS("H: toggle threads")
986 //usage: IF_FEATURE_SHOW_THREADS(IF_FEATURE_TOP_SMP_CPU(", "))
987 //usage: IF_FEATURE_TOP_SMP_CPU("1: toggle SMP")
989 //usage: "\n"" Q,^C: exit"
991 //usage: "\n""Options:"
992 //usage: "\n"" -b Batch mode"
993 //usage: "\n"" -n N Exit after N iterations"
994 //usage: "\n"" -d N Delay between updates"
995 //usage: IF_FEATURE_TOPMEM(
996 //usage: "\n"" -m Same as 's' key"
999 /* Interactive testing:
1000 * echo sss | ./busybox top
1001 * - shows memory screen
1002 * echo sss | ./busybox top -bn1 >mem
1003 * - saves memory screen - the *whole* list, not first NROWS processes!
1004 * echo .m.s.s.s.s.s.s.q | ./busybox top -b >z
1005 * - saves several different screens, and exits
1007 * TODO: -i STRING param as a better alternative?
1010 int top_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
1011 int top_main(int argc UNUSED_PARAM, char **argv)
1014 unsigned lines, col;
1016 char *str_interval, *str_iterations;
1017 unsigned scan_mask = TOP_MASK;
1018 #if ENABLE_FEATURE_USE_TERMIOS
1019 struct termios new_settings;
1024 interval = 5; /* default update interval is 5 seconds */
1025 iterations = 0; /* infinite */
1026 #if ENABLE_FEATURE_TOP_SMP_CPU
1028 /*smp_cpu_info = 0;*/ /* to start with show aggregate */
1030 cpu_prev_jif = &prev_jif;
1033 /* all args are options; -n NUM */
1034 opt_complementary = "-"; /* options can be specified w/o dash */
1035 col = getopt32(argv, "d:n:b"IF_FEATURE_TOPMEM("m"), &str_interval, &str_iterations);
1036 #if ENABLE_FEATURE_TOPMEM
1037 if (col & OPT_m) /* -m (busybox specific) */
1038 scan_mask = TOPMEM_MASK;
1041 /* work around for "-d 1" -> "-d -1" done by getopt32
1042 * (opt_complementary == "-" does this) */
1043 if (str_interval[0] == '-')
1045 /* Need to limit it to not overflow poll timeout */
1046 interval = xatou16(str_interval);
1049 if (str_iterations[0] == '-')
1051 iterations = xatou(str_iterations);
1054 /* change to /proc */
1057 #if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
1058 sort_function[0] = pcpu_sort;
1059 sort_function[1] = mem_sort;
1060 sort_function[2] = time_sort;
1062 sort_function[0] = mem_sort;
1065 #if ENABLE_FEATURE_USE_TERMIOS
1066 tcgetattr(0, (void *) &initial_settings);
1067 memcpy(&new_settings, &initial_settings, sizeof(new_settings));
1068 if (!OPT_BATCH_MODE) {
1069 /* unbuffered input, turn off echo */
1070 new_settings.c_lflag &= ~(ISIG | ICANON | ECHO | ECHONL);
1071 tcsetattr_stdin_TCSANOW(&new_settings);
1074 bb_signals(BB_FATAL_SIGS, sig_catcher);
1076 /* Eat initial input, if any */
1077 scan_mask = handle_input(scan_mask, 0);
1080 while (scan_mask != EXIT_MASK) {
1081 procps_status_t *p = NULL;
1083 if (OPT_BATCH_MODE) {
1085 col = LINE_BUF_SIZE - 2; /* +2 bytes for '\n', NUL */
1087 lines = 24; /* default */
1089 #if ENABLE_FEATURE_USE_TERMIOS
1090 /* We output to stdout, we need size of stdout (not stdin)! */
1091 get_terminal_width_height(STDOUT_FILENO, &col, &lines);
1092 if (lines < 5 || col < 10) {
1097 if (col > LINE_BUF_SIZE - 2)
1098 col = LINE_BUF_SIZE - 2;
1101 /* read process IDs & status for all the processes */
1102 while ((p = procps_scan(p, scan_mask)) != NULL) {
1104 #if ENABLE_FEATURE_TOPMEM
1105 if (scan_mask != TOPMEM_MASK)
1109 top = xrealloc_vector(top, 6, ntop++);
1110 top[n].pid = p->pid;
1111 top[n].ppid = p->ppid;
1112 top[n].vsz = p->vsz;
1113 #if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
1114 top[n].ticks = p->stime + p->utime;
1116 top[n].uid = p->uid;
1117 strcpy(top[n].state, p->state);
1118 strcpy(top[n].comm, p->comm);
1119 #if ENABLE_FEATURE_TOP_SMP_PROCESS
1120 top[n].last_seen_on_cpu = p->last_seen_on_cpu;
1123 #if ENABLE_FEATURE_TOPMEM
1125 if (!(p->smaps.mapped_ro | p->smaps.mapped_rw))
1126 continue; /* kernel threads are ignored */
1128 /* No bug here - top and topmem are the same */
1129 top = xrealloc_vector(topmem, 6, ntop++);
1130 strcpy(topmem[n].comm, p->comm);
1131 topmem[n].pid = p->pid;
1132 topmem[n].vsz = p->smaps.mapped_rw + p->smaps.mapped_ro;
1133 topmem[n].vszrw = p->smaps.mapped_rw;
1134 topmem[n].rss_sh = p->smaps.shared_clean + p->smaps.shared_dirty;
1135 topmem[n].rss = p->smaps.private_clean + p->smaps.private_dirty + topmem[n].rss_sh;
1136 topmem[n].dirty = p->smaps.private_dirty + p->smaps.shared_dirty;
1137 topmem[n].dirty_sh = p->smaps.shared_dirty;
1138 topmem[n].stack = p->smaps.stack;
1141 } /* end of "while we read /proc" */
1143 bb_error_msg("no process info in /proc");
1147 if (scan_mask != TOPMEM_MASK) {
1148 #if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
1149 if (!prev_hist_count) {
1156 /* TODO: we don't need to sort all 10000 processes, we need to find top 24! */
1157 qsort(top, ntop, sizeof(top_status_t), (void*)mult_lvl_cmp);
1159 qsort(top, ntop, sizeof(top_status_t), (void*)(sort_function[0]));
1162 #if ENABLE_FEATURE_TOPMEM
1164 qsort(topmem, ntop, sizeof(topmem_status_t), (void*)topmem_sort);
1167 if (scan_mask != TOPMEM_MASK)
1168 display_process_list(lines, col);
1169 #if ENABLE_FEATURE_TOPMEM
1171 display_topmem_process_list(lines, col);
1174 if (iterations >= 0 && !--iterations)
1176 #if !ENABLE_FEATURE_USE_TERMIOS
1179 if (option_mask32 & OPT_EOF)
1180 /* EOF on stdin ("top </dev/null") */
1183 scan_mask = handle_input(scan_mask, interval);
1184 #endif /* FEATURE_USE_TERMIOS */
1185 } /* end of "while (not Q)" */
1188 #if ENABLE_FEATURE_USE_TERMIOS
1191 return EXIT_SUCCESS;