2 * A tiny 'top' utility.
4 * This is written specifically for the linux /proc/<PID>/stat(m)
7 * This reads the PIDs of all processes and their status and shows
8 * the status of processes (first ones that fit to screen) at given
12 * - At startup this changes to /proc, all the reads are then
15 * (C) Eero Tamminen <oak at welho dot com>
17 * Rewroted by Vladimir Oleynik (C) 2002 <dzo@simtreas.ru>
20 /* Original code Copyrights */
22 * Copyright (c) 1992 Branko Lankester
23 * Copyright (c) 1992 Roger Binns
24 * Copyright (C) 1994-1996 Charles L. Blake.
25 * Copyright (C) 1992-1998 Michael K. Johnson
26 * May be distributed under the conditions of the
27 * GNU Library General Public License
30 #include <sys/types.h>
35 #include <sys/ioctl.h>
40 //#define FEATURE_CPU_USAGE_PERCENTAGE /* + 2k */
42 #ifdef FEATURE_CPU_USAGE_PERCENTAGE
46 #include <netinet/in.h> /* htons */
50 typedef int (*cmp_t)(procps_status_t *P, procps_status_t *Q);
52 static procps_status_t *top; /* Hehe */
56 static int pid_sort (procps_status_t *P, procps_status_t *Q)
61 if( p < q ) return -1;
66 static int mem_sort (procps_status_t *P, procps_status_t *Q)
71 if( p > q ) return -1;
76 #ifdef FEATURE_CPU_USAGE_PERCENTAGE
79 static cmp_t sort_function[sort_depth];
81 static int pcpu_sort (procps_status_t *P, procps_status_t *Q)
86 if( p > q ) return -1;
91 static int time_sort (procps_status_t *P, procps_status_t *Q)
98 if( p > q ) return -1;
103 int mult_lvl_cmp(void* a, void* b) {
106 for(i = 0; i < sort_depth; i++) {
107 cmp_val = (*sort_function[i])(a, b);
114 /* This structure stores some critical information from one frame to
115 the next. mostly used for sorting. Added cumulative and resident fields. */
124 * Calculates percent cpu usage for each task.
127 static struct save_hist *save_history;
129 static unsigned long Hertz;
131 /***********************************************************************
132 * Some values in /proc are expressed in units of 1/HZ seconds, where HZ
133 * is the kernel clock tick rate. One of these units is called a jiffy.
134 * The HZ value used in the kernel may vary according to hacker desire.
135 * According to Linus Torvalds, this is not true. He considers the values
136 * in /proc as being in architecture-dependant units that have no relation
137 * to the kernel clock tick rate. Examination of the kernel source code
138 * reveals that opinion as wishful thinking.
140 * In any case, we need the HZ constant as used in /proc. (the real HZ value
141 * may differ, but we don't care) There are several ways we could get HZ:
143 * 1. Include the kernel header file. If it changes, recompile this library.
144 * 2. Use the sysconf() function. When HZ changes, recompile the C library!
145 * 3. Ask the kernel. This is obviously correct...
147 * Linus Torvalds won't let us ask the kernel, because he thinks we should
148 * not know the HZ value. Oh well, we don't have to listen to him.
149 * Someone smuggled out the HZ value. :-)
151 * This code should work fine, even if Linus fixes the kernel to match his
152 * stated behavior. The code only fails in case of a partial conversion.
156 #define FILE_TO_BUF(filename, fd) do{ \
157 if (fd == -1 && (fd = open(filename, O_RDONLY)) == -1) { \
158 bb_perror_msg_and_die("/proc not be mounted?"); \
160 lseek(fd, 0L, SEEK_SET); \
161 if ((local_n = read(fd, buf, sizeof buf - 1)) < 0) { \
162 bb_perror_msg_and_die("%s", filename); \
164 buf[local_n] = '\0'; \
167 #define FILE_TO_BUF2(filename, fd) do{ \
168 lseek(fd, 0L, SEEK_SET); \
169 if ((local_n = read(fd, buf, sizeof buf - 1)) < 0) { \
170 bb_perror_msg_and_die("%s", filename); \
172 buf[local_n] = '\0'; \
175 static void init_Hertz_value(void) {
176 unsigned long user_j, nice_j, sys_j, other_j; /* jiffies (clock ticks) */
177 double up_1, up_2, seconds;
178 unsigned long jiffies, h;
183 long smp_num_cpus = sysconf(_SC_NPROCESSORS_CONF);
185 if(smp_num_cpus<1) smp_num_cpus=1;
189 FILE_TO_BUF("uptime", uptime_fd);
190 up_1 = strtod(buf, 0);
191 FILE_TO_BUF("stat", stat_fd);
192 sscanf(buf, "cpu %lu %lu %lu %lu", &user_j, &nice_j, &sys_j, &other_j);
193 FILE_TO_BUF2("uptime", uptime_fd);
194 up_2 = strtod(buf, 0);
195 } while((long)( (up_2-up_1)*1000.0/up_1 )); /* want under 0.1% error */
200 jiffies = user_j + nice_j + sys_j + other_j;
201 seconds = (up_1 + up_2) / 2;
202 h = (unsigned long)( (double)jiffies/seconds/smp_num_cpus );
203 /* actual values used by 2.4 kernels: 32 64 100 128 1000 1024 1200 */
205 case 30 ... 34 : Hertz = 32; break; /* ia64 emulator */
206 case 48 ... 52 : Hertz = 50; break;
207 case 58 ... 62 : Hertz = 60; break;
208 case 63 ... 65 : Hertz = 64; break; /* StrongARM /Shark */
209 case 95 ... 105 : Hertz = 100; break; /* normal Linux */
210 case 124 ... 132 : Hertz = 128; break; /* MIPS, ARM */
211 case 195 ... 204 : Hertz = 200; break; /* normal << 1 */
212 case 253 ... 260 : Hertz = 256; break;
213 case 295 ... 304 : Hertz = 300; break; /* 3 cpus */
214 case 393 ... 408 : Hertz = 400; break; /* normal << 2 */
215 case 495 ... 504 : Hertz = 500; break; /* 5 cpus */
216 case 595 ... 604 : Hertz = 600; break; /* 6 cpus */
217 case 695 ... 704 : Hertz = 700; break; /* 7 cpus */
218 case 790 ... 808 : Hertz = 800; break; /* normal << 3 */
219 case 895 ... 904 : Hertz = 900; break; /* 9 cpus */
220 case 990 ... 1010 : Hertz = 1000; break; /* ARM */
221 case 1015 ... 1035 : Hertz = 1024; break; /* Alpha, ia64 */
222 case 1095 ... 1104 : Hertz = 1100; break; /* 11 cpus */
223 case 1180 ... 1220 : Hertz = 1200; break; /* Alpha */
225 /* If 32-bit or big-endian (not Alpha or ia64), assume HZ is 100. */
226 Hertz = (sizeof(long)==sizeof(int) || htons(999)==999) ? 100UL : 1024UL;
230 static void do_stats(void)
233 static struct timeval oldtime;
234 struct timezone timez;
237 procps_status_t *cur;
238 int total_time, i, n;
239 static int prev_count;
240 int systime, usrtime, pid;
242 struct save_hist *New_save_hist;
245 * Finds the current time (in microseconds) and calculates the time
246 * elapsed since the last update.
248 gettimeofday(&t, &timez);
249 elapsed_time = (t.tv_sec - oldtime.tv_sec)
250 + (float) (t.tv_usec - oldtime.tv_usec) / 1000000.0;
251 oldtime.tv_sec = t.tv_sec;
252 oldtime.tv_usec = t.tv_usec;
254 New_save_hist = alloca(sizeof(struct save_hist)*ntop);
256 * Make a pass through the data to get stats.
258 for(n = 0; n < ntop; n++) {
262 * Calculate time in cur process. Time is sum of user time
263 * (usrtime) plus system time (systime).
265 systime = cur->stime;
266 usrtime = cur->utime;
268 total_time = systime + usrtime;
269 New_save_hist[n].ticks = total_time;
270 New_save_hist[n].pid = pid;
271 New_save_hist[n].stime = systime;
272 New_save_hist[n].utime = usrtime;
274 /* find matching entry from previous pass */
275 for (i = 0; i < prev_count; i++) {
276 if (save_history[i].pid == pid) {
277 total_time -= save_history[i].ticks;
278 systime -= save_history[i].stime;
279 usrtime -= save_history[i].utime;
285 * Calculate percent cpu time for cur task.
287 i = (total_time * 10 * 100/Hertz) / elapsed_time;
295 * Save cur frame's information.
298 save_history = memcpy(xmalloc(sizeof(struct save_hist)*n), New_save_hist,
299 sizeof(struct save_hist)*n);
301 qsort(top, n, sizeof(procps_status_t), (void*)mult_lvl_cmp);
304 static cmp_t sort_function;
305 #endif /* FEATURE_CPU_USAGE_PERCENTAGE */
307 /* display generic info (meminfo / loadavg) */
308 static unsigned long display_generic(void)
312 float avg1, avg2, avg3;
313 unsigned long total, used, mfree, shared, buffers, cached;
315 /* read memory info */
316 fp = bb_xfopen("meminfo", "r");
317 fgets(buf, sizeof(buf), fp); /* skip first line */
319 if (fscanf(fp, "Mem: %lu %lu %lu %lu %lu %lu",
320 &total, &used, &mfree, &shared, &buffers, &cached) != 6) {
321 bb_error_msg_and_die("failed to read '%s'", "meminfo");
325 /* read load average */
326 fp = bb_xfopen("loadavg", "r");
327 if (fscanf(fp, "%f %f %f", &avg1, &avg2, &avg3) != 3) {
328 bb_error_msg_and_die("failed to read '%s'", "loadavg");
332 /* convert to kilobytes */
339 /* output memory info and load average */
340 /* clear screen & go to top */
341 printf("\e[H\e[J" "Mem: "
342 "%ldK used, %ldK free, %ldK shrd, %ldK buff, %ldK cached\n",
343 used, mfree, shared, buffers, cached);
344 printf("Load average: %.2f, %.2f, %.2f "
345 "(State: S=sleeping R=running, W=waiting)\n",
351 /* display process statuses */
352 static void display_status(int count, int col)
354 procps_status_t *s = top;
356 unsigned long total_memory = display_generic();
358 #ifdef FEATURE_CPU_USAGE_PERCENTAGE
359 /* what info of the processes is shown */
360 printf("\n\e[7m PID USER STATUS RSS PPID %%CPU %%MEM COMMAND\e[0m\n");
362 printf("\n\e[7m PID USER STATUS RSS PPID %%MEM COMMAND\e[0m\n");
366 char *namecmd = s->short_cmd;
369 pmem = 1000.0 * s->rss / total_memory;
370 if (pmem > 999) pmem = 999;
373 sprintf(rss_str_buf, "%6ldM", s->rss/1024);
375 sprintf(rss_str_buf, "%7ld", s->rss);
376 #ifdef FEATURE_CPU_USAGE_PERCENTAGE
377 printf("%5d %-8s %s %s %5d %2d.%d %2u.%u ",
379 printf("%5d %-8s %s %s %5d %2u.%u ",
381 s->pid, s->user, s->state, rss_str_buf, s->ppid,
382 #ifdef FEATURE_CPU_USAGE_PERCENTAGE
383 s->pcpu/10, s->pcpu%10,
386 if(strlen(namecmd) > col)
388 printf("%s\n", namecmd);
393 static void clearmems(void)
400 #if defined CONFIG_FEATURE_USE_TERMIOS
402 #include <sys/time.h>
406 static struct termios initial_settings;
408 static void reset_term(void)
410 tcsetattr(0, TCSANOW, (void *) &initial_settings);
411 #ifdef CONFIG_FEATURE_CLEAN_UP
413 #ifdef FEATURE_CPU_USAGE_PERCENTAGE
416 #endif /* CONFIG_FEATURE_CLEAN_UP */
419 static void sig_catcher (int sig)
423 #endif /* CONFIG_FEATURE_USE_TERMIOS */
426 int top_main(int argc, char **argv)
428 int opt, interval, lines, col;
429 #if defined CONFIG_FEATURE_USE_TERMIOS
430 struct termios new_settings;
435 #if defined CONFIG_FEATURE_AUTOWIDTH
436 struct winsize win = { 0, 0, 0, 0 };
438 #endif /* CONFIG_FEATURE_USE_TERMIOS */
440 /* Default update rate is 5 seconds */
443 /* do normal option parsing */
444 while ((opt = getopt(argc, argv, "d:")) > 0) {
447 interval = atoi(optarg);
454 /* Default to 25 lines - 5 lines for status */
456 /* Default CMD format size */
457 #ifdef FEATURE_CPU_USAGE_PERCENTAGE
462 /* change to /proc */
463 if (chdir("/proc") < 0) {
464 bb_perror_msg_and_die("chdir('/proc')");
466 #if defined CONFIG_FEATURE_USE_TERMIOS
467 tcgetattr(0, (void *) &initial_settings);
468 memcpy(&new_settings, &initial_settings, sizeof(struct termios));
469 new_settings.c_lflag &= ~(ISIG | ICANON); /* unbuffered input */
470 /* Turn off echoing */
471 new_settings.c_lflag &= ~(ECHO | ECHONL);
473 signal (SIGTERM, sig_catcher);
474 sigaction (SIGTERM, (struct sigaction *) 0, &sa);
475 sa.sa_flags |= SA_RESTART;
476 sa.sa_flags &= ~SA_INTERRUPT;
477 sigaction (SIGTERM, &sa, (struct sigaction *) 0);
478 sigaction (SIGINT, &sa, (struct sigaction *) 0);
479 tcsetattr(0, TCSANOW, (void *) &new_settings);
481 #if defined CONFIG_FEATURE_AUTOWIDTH
482 ioctl(0, TIOCGWINSZ, &win);
483 if (win.ws_row > 4) {
484 lines = win.ws_row - 5;
485 #ifdef FEATURE_CPU_USAGE_PERCENTAGE
486 col = win.ws_col - 80 + 35 - 6;
488 col = win.ws_col - 80 + 35;
492 #endif /* CONFIG_FEATURE_USE_TERMIOS */
493 #ifdef FEATURE_CPU_USAGE_PERCENTAGE
494 sort_function[0] = pcpu_sort;
495 sort_function[1] = mem_sort;
496 sort_function[2] = time_sort;
498 sort_function = mem_sort;
501 /* read process IDs & status for all the processes */
504 #ifdef CONFIG_SELINUX
505 while ((p = procps_scan(0, 0, NULL) ) != 0) {
507 while ((p = procps_scan(0)) != 0) {
511 top = xrealloc(top, (++ntop)*sizeof(procps_status_t));
512 memcpy(top + n, p, sizeof(procps_status_t));
515 bb_perror_msg_and_die("scandir('/proc')");
517 #ifdef FEATURE_CPU_USAGE_PERCENTAGE
527 qsort(top, ntop, sizeof(procps_status_t), (void*)sort_function);
533 /* show status for each of the processes */
534 display_status(opt, col);
535 #if defined CONFIG_FEATURE_USE_TERMIOS
536 tv.tv_sec = interval;
539 FD_SET (0, &readfds);
540 select (1, &readfds, NULL, NULL, &tv);
541 if (FD_ISSET (0, &readfds)) {
542 if (read (0, &c, 1) <= 0) { /* signal */
545 if(c == 'q' || c == initial_settings.c_cc[VINTR])
548 #ifdef FEATURE_CPU_USAGE_PERCENTAGE
549 sort_function[0] = mem_sort;
550 sort_function[1] = pcpu_sort;
551 sort_function[2] = time_sort;
553 sort_function = mem_sort;
556 #ifdef FEATURE_CPU_USAGE_PERCENTAGE
558 sort_function[0] = pcpu_sort;
559 sort_function[1] = mem_sort;
560 sort_function[2] = time_sort;
563 sort_function[0] = time_sort;
564 sort_function[1] = mem_sort;
565 sort_function[2] = pcpu_sort;
569 #ifdef FEATURE_CPU_USAGE_PERCENTAGE
570 sort_function[0] = pid_sort;
572 sort_function = pid_sort;
578 #endif /* CONFIG_FEATURE_USE_TERMIOS */