blob: 1b6f7072f12da6f91f5af7a777b1b92335f185e9 [file] [log] [blame]
Bernhard Reutner-Fischerd9cf7ac2006-04-12 18:39:58 +00001/* vi: set sw=4 ts=4: */
Eric Andersen420b2082002-09-17 22:14:58 +00002/*
3 * A tiny 'top' utility.
4 *
Eric Andersen08a72202002-09-30 20:52:10 +00005 * 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.
Eric Andersenc7bda1c2004-03-15 08:29:22 +000011 *
Eric Andersen420b2082002-09-17 22:14:58 +000012 * NOTES:
13 * - At startup this changes to /proc, all the reads are then
14 * relative to that.
Eric Andersenc7bda1c2004-03-15 08:29:22 +000015 *
Eric Andersen420b2082002-09-17 22:14:58 +000016 * (C) Eero Tamminen <oak at welho dot com>
Eric Andersen08a72202002-09-30 20:52:10 +000017 *
Eric Andersenaff114c2004-04-14 17:51:38 +000018 * Rewritten by Vladimir Oleynik (C) 2002 <dzo@simtreas.ru>
Eric Andersen420b2082002-09-17 22:14:58 +000019 */
Eric Andersen08a72202002-09-30 20:52:10 +000020
21/* Original code Copyrights */
22/*
23 * Copyright (c) 1992 Branko Lankester
24 * Copyright (c) 1992 Roger Binns
25 * Copyright (C) 1994-1996 Charles L. Blake.
26 * Copyright (C) 1992-1998 Michael K. Johnson
27 * May be distributed under the conditions of the
28 * GNU Library General Public License
29 */
30
Bernhard Reutner-Fischere15d7572006-06-02 20:56:16 +000031#include "busybox.h"
Eric Andersen420b2082002-09-17 22:14:58 +000032
"Vladimir N. Oleynik"f246dc72005-09-16 12:55:29 +000033//#define CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE /* + 2k */
Eric Andersen420b2082002-09-17 22:14:58 +000034
Eric Andersen44608e92002-10-22 12:21:15 +000035typedef int (*cmp_t)(procps_status_t *P, procps_status_t *Q);
Eric Andersen08a72202002-09-30 20:52:10 +000036
Eric Andersen44608e92002-10-22 12:21:15 +000037static procps_status_t *top; /* Hehe */
Eric Andersen08a72202002-09-30 20:52:10 +000038static int ntop;
39
Mike Frysinger223b8872005-07-30 09:42:05 +000040#ifdef CONFIG_FEATURE_USE_TERMIOS
Rob Landley997650b2006-04-24 23:13:46 +000041static int pid_sort(procps_status_t *P, procps_status_t *Q)
Eric Andersen08a72202002-09-30 20:52:10 +000042{
Rob Landleyb2804552006-02-13 22:04:27 +000043 return (Q->pid - P->pid);
Eric Andersen08a72202002-09-30 20:52:10 +000044}
Mike Frysinger223b8872005-07-30 09:42:05 +000045#endif
Eric Andersen08a72202002-09-30 20:52:10 +000046
Rob Landley997650b2006-04-24 23:13:46 +000047static int mem_sort(procps_status_t *P, procps_status_t *Q)
Eric Andersen08a72202002-09-30 20:52:10 +000048{
Rob Landleyb2804552006-02-13 22:04:27 +000049 return (int)(Q->rss - P->rss);
Eric Andersen08a72202002-09-30 20:52:10 +000050}
51
"Vladimir N. Oleynik"f246dc72005-09-16 12:55:29 +000052#ifdef CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE
Eric Andersen08a72202002-09-30 20:52:10 +000053
54#define sort_depth 3
55static cmp_t sort_function[sort_depth];
56
Rob Landley997650b2006-04-24 23:13:46 +000057static int pcpu_sort(procps_status_t *P, procps_status_t *Q)
Eric Andersen08a72202002-09-30 20:52:10 +000058{
Rob Landleyb2804552006-02-13 22:04:27 +000059 return (Q->pcpu - P->pcpu);
Eric Andersen08a72202002-09-30 20:52:10 +000060}
61
Rob Landley997650b2006-04-24 23:13:46 +000062static int time_sort(procps_status_t *P, procps_status_t *Q)
Eric Andersen08a72202002-09-30 20:52:10 +000063{
Rob Landleyb2804552006-02-13 22:04:27 +000064 return (int)((Q->stime + Q->utime) - (P->stime + P->utime));
Eric Andersen08a72202002-09-30 20:52:10 +000065}
66
Eric Andersen14f5c8d2005-04-16 19:39:00 +000067static int mult_lvl_cmp(void* a, void* b) {
Rob Landleyb2804552006-02-13 22:04:27 +000068 int i, cmp_val;
Eric Andersen08a72202002-09-30 20:52:10 +000069
Rob Landley997650b2006-04-24 23:13:46 +000070 for (i = 0; i < sort_depth; i++) {
Rob Landleyb2804552006-02-13 22:04:27 +000071 cmp_val = (*sort_function[i])(a, b);
72 if (cmp_val != 0)
73 return cmp_val;
74 }
75 return 0;
Eric Andersen08a72202002-09-30 20:52:10 +000076}
77
78/* This structure stores some critical information from one frame to
79 the next. mostly used for sorting. Added cumulative and resident fields. */
80struct save_hist {
Rob Landleyb2804552006-02-13 22:04:27 +000081 int ticks;
82 int pid;
Eric Andersen08a72202002-09-30 20:52:10 +000083};
84
85/*
86 * Calculates percent cpu usage for each task.
87 */
88
Rob Landley997650b2006-04-24 23:13:46 +000089static struct save_hist *prev_hist;
90static int prev_hist_count;
91/* static int hist_iterations; */
Eric Andersen08a72202002-09-30 20:52:10 +000092
Eric Andersen08a72202002-09-30 20:52:10 +000093
Rob Landley997650b2006-04-24 23:13:46 +000094static unsigned total_pcpu;
95/* static unsigned long total_rss; */
Eric Andersen08a72202002-09-30 20:52:10 +000096
Rob Landley997650b2006-04-24 23:13:46 +000097struct jiffy_counts {
98 unsigned long long usr,nic,sys,idle,iowait,irq,softirq,steal;
99 unsigned long long total;
100 unsigned long long busy;
101};
102static struct jiffy_counts jif, prev_jif;
103
104static void get_jiffy_counts(void)
Rob Landleyb2804552006-02-13 22:04:27 +0000105{
Rob Landleyd921b2e2006-08-03 15:41:12 +0000106 FILE* fp = xfopen("stat", "r");
Rob Landley997650b2006-04-24 23:13:46 +0000107 prev_jif = jif;
108 if (fscanf(fp, "cpu %lld %lld %lld %lld %lld %lld %lld %lld",
109 &jif.usr,&jif.nic,&jif.sys,&jif.idle,
110 &jif.iowait,&jif.irq,&jif.softirq,&jif.steal) < 4) {
111 bb_error_msg_and_die("failed to read 'stat'");
Rob Landleyb2804552006-02-13 22:04:27 +0000112 }
Rob Landley997650b2006-04-24 23:13:46 +0000113 fclose(fp);
114 jif.total = jif.usr + jif.nic + jif.sys + jif.idle
115 + jif.iowait + jif.irq + jif.softirq + jif.steal;
116 /* procps 2.x does not count iowait as busy time */
117 jif.busy = jif.total - jif.idle - jif.iowait;
Eric Andersen08a72202002-09-30 20:52:10 +0000118}
119
120static void do_stats(void)
121{
Rob Landleyb2804552006-02-13 22:04:27 +0000122 procps_status_t *cur;
Rob Landley997650b2006-04-24 23:13:46 +0000123 int pid, total_time, i, last_i, n;
124 struct save_hist *new_hist;
Eric Andersen08a72202002-09-30 20:52:10 +0000125
Rob Landley997650b2006-04-24 23:13:46 +0000126 get_jiffy_counts();
127 total_pcpu = 0;
128 /* total_rss = 0; */
129 new_hist = xmalloc(sizeof(struct save_hist)*ntop);
Rob Landleyb2804552006-02-13 22:04:27 +0000130 /*
131 * Make a pass through the data to get stats.
132 */
Rob Landley997650b2006-04-24 23:13:46 +0000133 /* hist_iterations = 0; */
134 i = 0;
135 for (n = 0; n < ntop; n++) {
Rob Landleyb2804552006-02-13 22:04:27 +0000136 cur = top + n;
137
138 /*
139 * Calculate time in cur process. Time is sum of user time
Rob Landley997650b2006-04-24 23:13:46 +0000140 * and system time
Rob Landleyb2804552006-02-13 22:04:27 +0000141 */
Rob Landleyb2804552006-02-13 22:04:27 +0000142 pid = cur->pid;
Rob Landley997650b2006-04-24 23:13:46 +0000143 total_time = cur->stime + cur->utime;
144 new_hist[n].ticks = total_time;
145 new_hist[n].pid = pid;
Rob Landleyb2804552006-02-13 22:04:27 +0000146
147 /* find matching entry from previous pass */
Rob Landley997650b2006-04-24 23:13:46 +0000148 cur->pcpu = 0;
149 /* do not start at index 0, continue at last used one
150 * (brought hist_iterations from ~14000 down to 172) */
151 last_i = i;
152 if (prev_hist_count) do {
153 if (prev_hist[i].pid == pid) {
154 cur->pcpu = total_time - prev_hist[i].ticks;
Rob Landleyb2804552006-02-13 22:04:27 +0000155 break;
156 }
Rob Landley997650b2006-04-24 23:13:46 +0000157 i = (i+1) % prev_hist_count;
158 /* hist_iterations++; */
159 } while (i != last_i);
160 total_pcpu += cur->pcpu;
161 /* total_rss += cur->rss; */
Eric Andersen08a72202002-09-30 20:52:10 +0000162 }
163
164 /*
Rob Landleyb2804552006-02-13 22:04:27 +0000165 * Save cur frame's information.
Eric Andersen08a72202002-09-30 20:52:10 +0000166 */
Rob Landley997650b2006-04-24 23:13:46 +0000167 free(prev_hist);
168 prev_hist = new_hist;
169 prev_hist_count = ntop;
Eric Andersen08a72202002-09-30 20:52:10 +0000170}
171#else
172static cmp_t sort_function;
"Vladimir N. Oleynik"f246dc72005-09-16 12:55:29 +0000173#endif /* CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE */
Eric Andersen08a72202002-09-30 20:52:10 +0000174
Eric Andersen420b2082002-09-17 22:14:58 +0000175/* display generic info (meminfo / loadavg) */
Rob Landley997650b2006-04-24 23:13:46 +0000176static unsigned long display_generic(int scr_width)
Eric Andersen420b2082002-09-17 22:14:58 +0000177{
178 FILE *fp;
179 char buf[80];
Rob Landley997650b2006-04-24 23:13:46 +0000180 char scrbuf[80];
181 char *end;
Eric Andersen420b2082002-09-17 22:14:58 +0000182 unsigned long total, used, mfree, shared, buffers, cached;
Eric Andersen7857c032003-10-11 18:47:20 +0000183 unsigned int needs_conversion = 1;
Eric Andersen420b2082002-09-17 22:14:58 +0000184
185 /* read memory info */
Rob Landleyd921b2e2006-08-03 15:41:12 +0000186 fp = xfopen("meminfo", "r");
Eric Andersen420b2082002-09-17 22:14:58 +0000187
Eric Andersen7857c032003-10-11 18:47:20 +0000188 /*
189 * Old kernels (such as 2.4.x) had a nice summary of memory info that
190 * we could parse, however this is gone entirely in 2.6. Try parsing
191 * the old way first, and if that fails, parse each field manually.
192 *
193 * First, we read in the first line. Old kernels will have bogus
194 * strings we don't care about, whereas new kernels will start right
195 * out with MemTotal:
"Vladimir N. Oleynik"70678bc2005-11-29 12:32:33 +0000196 * -- PFM.
Eric Andersen7857c032003-10-11 18:47:20 +0000197 */
198 if (fscanf(fp, "MemTotal: %lu %s\n", &total, buf) != 2) {
"Vladimir N. Oleynik"70678bc2005-11-29 12:32:33 +0000199 fgets(buf, sizeof(buf), fp); /* skip first line */
Eric Andersen7857c032003-10-11 18:47:20 +0000200
201 fscanf(fp, "Mem: %lu %lu %lu %lu %lu %lu",
202 &total, &used, &mfree, &shared, &buffers, &cached);
203 } else {
Eric Andersenc7bda1c2004-03-15 08:29:22 +0000204 /*
Eric Andersen7857c032003-10-11 18:47:20 +0000205 * Revert to manual parsing, which incidentally already has the
206 * sizes in kilobytes. This should be safe for both 2.4 and
207 * 2.6.
208 */
209 needs_conversion = 0;
210
211 fscanf(fp, "MemFree: %lu %s\n", &mfree, buf);
212
Eric Andersenc7bda1c2004-03-15 08:29:22 +0000213 /*
Eric Andersen7857c032003-10-11 18:47:20 +0000214 * MemShared: is no longer present in 2.6. Report this as 0,
215 * to maintain consistent behavior with normal procps.
216 */
217 if (fscanf(fp, "MemShared: %lu %s\n", &shared, buf) != 2)
218 shared = 0;
219
220 fscanf(fp, "Buffers: %lu %s\n", &buffers, buf);
221 fscanf(fp, "Cached: %lu %s\n", &cached, buf);
222
223 used = total - mfree;
Eric Andersen420b2082002-09-17 22:14:58 +0000224 }
225 fclose(fp);
Eric Andersenc7bda1c2004-03-15 08:29:22 +0000226
Rob Landley997650b2006-04-24 23:13:46 +0000227 /* read load average as a string */
Rob Landleyd921b2e2006-08-03 15:41:12 +0000228 fp = xfopen("loadavg", "r");
Rob Landley997650b2006-04-24 23:13:46 +0000229 buf[0] = '\0';
230 fgets(buf, sizeof(buf), fp);
231 end = strchr(buf, ' ');
232 if (end) end = strchr(end+1, ' ');
233 if (end) end = strchr(end+1, ' ');
234 if (end) *end = '\0';
Eric Andersen420b2082002-09-17 22:14:58 +0000235 fclose(fp);
236
Eric Andersen7857c032003-10-11 18:47:20 +0000237 if (needs_conversion) {
238 /* convert to kilobytes */
239 used /= 1024;
240 mfree /= 1024;
241 shared /= 1024;
242 buffers /= 1024;
243 cached /= 1024;
244 total /= 1024;
245 }
Eric Andersenc7bda1c2004-03-15 08:29:22 +0000246
Eric Andersen420b2082002-09-17 22:14:58 +0000247 /* output memory info and load average */
Eric Andersen08a72202002-09-30 20:52:10 +0000248 /* clear screen & go to top */
Rob Landley997650b2006-04-24 23:13:46 +0000249 if (scr_width > sizeof(scrbuf))
250 scr_width = sizeof(scrbuf);
251 snprintf(scrbuf, scr_width,
252 "Mem: %ldK used, %ldK free, %ldK shrd, %ldK buff, %ldK cached",
Rob Landleyb2804552006-02-13 22:04:27 +0000253 used, mfree, shared, buffers, cached);
Rob Landley997650b2006-04-24 23:13:46 +0000254 printf("\e[H\e[J%s\n", scrbuf);
255 snprintf(scrbuf, scr_width,
256 "Load average: %s (Status: S=sleeping R=running, W=waiting)", buf);
257 printf("%s\n", scrbuf);
258
Eric Andersen7857c032003-10-11 18:47:20 +0000259 return total;
Eric Andersen420b2082002-09-17 22:14:58 +0000260}
261
262
263/* display process statuses */
Rob Landley997650b2006-04-24 23:13:46 +0000264static void display_status(int count, int scr_width)
Eric Andersen420b2082002-09-17 22:14:58 +0000265{
Rob Landley997650b2006-04-24 23:13:46 +0000266 enum {
267 bits_per_int = sizeof(int)*8
268 };
269
Eric Andersen44608e92002-10-22 12:21:15 +0000270 procps_status_t *s = top;
Eric Andersen08a72202002-09-30 20:52:10 +0000271 char rss_str_buf[8];
Rob Landley997650b2006-04-24 23:13:46 +0000272 unsigned long total_memory = display_generic(scr_width); /* or use total_rss? */
273 unsigned pmem_shift, pmem_scale;
Eric Andersenc7bda1c2004-03-15 08:29:22 +0000274
"Vladimir N. Oleynik"f246dc72005-09-16 12:55:29 +0000275#ifdef CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE
Rob Landley997650b2006-04-24 23:13:46 +0000276 unsigned pcpu_shift, pcpu_scale;
277
Eric Andersen420b2082002-09-17 22:14:58 +0000278 /* what info of the processes is shown */
Rob Landley997650b2006-04-24 23:13:46 +0000279 printf("\e[7m%.*s\e[0m", scr_width,
280 " PID USER STATUS RSS PPID %CPU %MEM COMMAND");
281#define MIN_WIDTH \
282 sizeof( " PID USER STATUS RSS PPID %CPU %MEM C")
Eric Andersen08a72202002-09-30 20:52:10 +0000283#else
Rob Landley997650b2006-04-24 23:13:46 +0000284 printf("\e[7m%.*s\e[0m", scr_width,
285 " PID USER STATUS RSS PPID %MEM COMMAND");
286#define MIN_WIDTH \
287 sizeof( " PID USER STATUS RSS PPID %MEM C")
288#endif
289
290 /*
291 * MEM% = s->rss/MemTotal
292 */
293 pmem_shift = bits_per_int-11;
294 pmem_scale = 1000*(1U<<(bits_per_int-11)) / total_memory;
295 /* s->rss is in kb. we want (s->rss * pmem_scale) to never overflow */
296 while (pmem_scale >= 512) {
297 pmem_scale /= 4;
298 pmem_shift -= 2;
299 }
300#ifdef CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE
301 /*
302 * CPU% = s->pcpu/sum(s->pcpu) * busy_cpu_ticks/total_cpu_ticks
303 * (pcpu is delta of sys+user time between samples)
304 */
305 /* (jif.xxx - prev_jif.xxx) and s->pcpu are
306 * in 0..~64000 range (HZ*update_interval).
307 * we assume that unsigned is at least 32-bit.
308 */
309 pcpu_shift = 6;
310 pcpu_scale = (1000*64*(uint16_t)(jif.busy-prev_jif.busy) ? : 1);
311 while (pcpu_scale < (1U<<(bits_per_int-2))) {
312 pcpu_scale *= 4;
313 pcpu_shift += 2;
314 }
315 pcpu_scale /= ( (uint16_t)(jif.total-prev_jif.total)*total_pcpu ? : 1);
316 /* we want (s->pcpu * pcpu_scale) to never overflow */
317 while (pcpu_scale >= 1024) {
318 pcpu_scale /= 4;
319 pcpu_shift -= 2;
320 }
321 /* printf(" pmem_scale=%u pcpu_scale=%u ", pmem_scale, pcpu_scale); */
Eric Andersen08a72202002-09-30 20:52:10 +0000322#endif
Eric Andersen420b2082002-09-17 22:14:58 +0000323
324 while (count--) {
Rob Landley997650b2006-04-24 23:13:46 +0000325 div_t pmem = div( (s->rss*pmem_scale) >> pmem_shift, 10);
326 int col = scr_width+1;
Bernhard Reutner-Fischere2922e42006-05-19 12:48:56 +0000327 USE_FEATURE_TOP_CPU_USAGE_PERCENTAGE(div_t pcpu;)
Eric Andersen420b2082002-09-17 22:14:58 +0000328
Rob Landley997650b2006-04-24 23:13:46 +0000329 if (s->rss >= 100*1024)
Eric Andersen08a72202002-09-30 20:52:10 +0000330 sprintf(rss_str_buf, "%6ldM", s->rss/1024);
Manuel Novoa III d4993302002-09-18 19:27:10 +0000331 else
Eric Andersen08a72202002-09-30 20:52:10 +0000332 sprintf(rss_str_buf, "%7ld", s->rss);
Bernhard Reutner-Fischere2922e42006-05-19 12:48:56 +0000333 USE_FEATURE_TOP_CPU_USAGE_PERCENTAGE(pcpu = div((s->pcpu*pcpu_scale) >> pcpu_shift, 10);)
Rob Landley0c430462006-05-04 19:51:22 +0000334 col -= printf("\n%5d %-8s %s %s%6d%3u.%c" \
Bernhard Reutner-Fischere2922e42006-05-19 12:48:56 +0000335 USE_FEATURE_TOP_CPU_USAGE_PERCENTAGE("%3u.%c") " ",
Rob Landley997650b2006-04-24 23:13:46 +0000336 s->pid, s->user, s->state, rss_str_buf, s->ppid,
Rob Landley0c430462006-05-04 19:51:22 +0000337 USE_FEATURE_TOP_CPU_USAGE_PERCENTAGE(pcpu.quot, '0'+pcpu.rem,)
338 pmem.quot, '0'+pmem.rem);
Rob Landley997650b2006-04-24 23:13:46 +0000339 if (col>0)
340 printf("%.*s", col, s->short_cmd);
Bernhard Reutner-Fischere2922e42006-05-19 12:48:56 +0000341 /* printf(" %d/%d %lld/%lld", s->pcpu, total_pcpu,
Rob Landley997650b2006-04-24 23:13:46 +0000342 jif.busy - prev_jif.busy, jif.total - prev_jif.total); */
Eric Andersen420b2082002-09-17 22:14:58 +0000343 s++;
Eric Andersen08a72202002-09-30 20:52:10 +0000344 }
Rob Landley997650b2006-04-24 23:13:46 +0000345 /* printf(" %d", hist_iterations); */
346 putchar('\r');
347 fflush(stdout);
Eric Andersen44608e92002-10-22 12:21:15 +0000348}
349
350static void clearmems(void)
351{
Eric Andersen08a72202002-09-30 20:52:10 +0000352 free(top);
Eric Andersen08a72202002-09-30 20:52:10 +0000353 top = 0;
Eric Andersen08a72202002-09-30 20:52:10 +0000354 ntop = 0;
355}
356
Mike Frysinger223b8872005-07-30 09:42:05 +0000357#ifdef CONFIG_FEATURE_USE_TERMIOS
Eric Andersen08a72202002-09-30 20:52:10 +0000358#include <termios.h>
Eric Andersen08a72202002-09-30 20:52:10 +0000359#include <signal.h>
360
361
362static struct termios initial_settings;
363
364static void reset_term(void)
365{
366 tcsetattr(0, TCSANOW, (void *) &initial_settings);
367#ifdef CONFIG_FEATURE_CLEAN_UP
368 clearmems();
"Vladimir N. Oleynik"f246dc72005-09-16 12:55:29 +0000369#ifdef CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE
Rob Landley997650b2006-04-24 23:13:46 +0000370 free(prev_hist);
Eric Andersen08a72202002-09-30 20:52:10 +0000371#endif
372#endif /* CONFIG_FEATURE_CLEAN_UP */
373}
Eric Andersenc7bda1c2004-03-15 08:29:22 +0000374
Rob Landleyb2804552006-02-13 22:04:27 +0000375static void sig_catcher(int sig ATTRIBUTE_UNUSED)
Eric Andersen08a72202002-09-30 20:52:10 +0000376{
377 reset_term();
Rob Landleydb1ab1a2006-06-28 14:11:25 +0000378 exit(1);
Eric Andersen08a72202002-09-30 20:52:10 +0000379}
380#endif /* CONFIG_FEATURE_USE_TERMIOS */
381
382
Eric Andersen420b2082002-09-17 22:14:58 +0000383int top_main(int argc, char **argv)
384{
Eric Andersen08a72202002-09-30 20:52:10 +0000385 int opt, interval, lines, col;
"Vladimir N. Oleynik"70678bc2005-11-29 12:32:33 +0000386 char *sinterval;
Mike Frysinger223b8872005-07-30 09:42:05 +0000387#ifdef CONFIG_FEATURE_USE_TERMIOS
Eric Andersen08a72202002-09-30 20:52:10 +0000388 struct termios new_settings;
389 struct timeval tv;
390 fd_set readfds;
391 unsigned char c;
Eric Andersen08a72202002-09-30 20:52:10 +0000392#endif /* CONFIG_FEATURE_USE_TERMIOS */
393
Eric Andersen420b2082002-09-17 22:14:58 +0000394 /* do normal option parsing */
"Vladimir N. Oleynik"70678bc2005-11-29 12:32:33 +0000395 opt = bb_getopt_ulflags(argc, argv, "d:", &sinterval);
Rob Landley997650b2006-04-24 23:13:46 +0000396 if ((opt & 1)) {
"Vladimir N. Oleynik"70678bc2005-11-29 12:32:33 +0000397 interval = atoi(sinterval);
398 } else {
399 /* Default update rate is 5 seconds */
400 interval = 5;
Eric Andersen420b2082002-09-17 22:14:58 +0000401 }
402
Eric Andersen44608e92002-10-22 12:21:15 +0000403 /* change to /proc */
Rob Landleyd921b2e2006-08-03 15:41:12 +0000404 xchdir("/proc");
Mike Frysinger223b8872005-07-30 09:42:05 +0000405#ifdef CONFIG_FEATURE_USE_TERMIOS
Eric Andersen08a72202002-09-30 20:52:10 +0000406 tcgetattr(0, (void *) &initial_settings);
407 memcpy(&new_settings, &initial_settings, sizeof(struct termios));
408 new_settings.c_lflag &= ~(ISIG | ICANON); /* unbuffered input */
409 /* Turn off echoing */
410 new_settings.c_lflag &= ~(ECHO | ECHONL);
411
Rob Landley997650b2006-04-24 23:13:46 +0000412 signal(SIGTERM, sig_catcher);
Rob Landleydb1ab1a2006-06-28 14:11:25 +0000413 signal(SIGINT, sig_catcher);
Eric Andersen08a72202002-09-30 20:52:10 +0000414 tcsetattr(0, TCSANOW, (void *) &new_settings);
415 atexit(reset_term);
Eric Andersen08a72202002-09-30 20:52:10 +0000416#endif /* CONFIG_FEATURE_USE_TERMIOS */
Mike Frysinger223b8872005-07-30 09:42:05 +0000417
"Vladimir N. Oleynik"f246dc72005-09-16 12:55:29 +0000418#ifdef CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE
Eric Andersen08a72202002-09-30 20:52:10 +0000419 sort_function[0] = pcpu_sort;
420 sort_function[1] = mem_sort;
421 sort_function[2] = time_sort;
422#else
423 sort_function = mem_sort;
"Vladimir N. Oleynik"f246dc72005-09-16 12:55:29 +0000424#endif /* CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE */
Mike Frysinger223b8872005-07-30 09:42:05 +0000425
Eric Andersen08a72202002-09-30 20:52:10 +0000426 while (1) {
Rob Landley997650b2006-04-24 23:13:46 +0000427 procps_status_t *p;
Eric Andersen44608e92002-10-22 12:21:15 +0000428
Rob Landley997650b2006-04-24 23:13:46 +0000429 /* Default to 25 lines - 5 lines for status */
430 lines = 24 - 3;
431 col = 79;
432#ifdef CONFIG_FEATURE_USE_TERMIOS
433 get_terminal_width_height(0, &col, &lines);
434 if (lines < 5 || col < MIN_WIDTH) {
435 sleep(interval);
436 continue;
437 }
438 lines -= 3;
439#endif /* CONFIG_FEATURE_USE_TERMIOS */
440
441 /* read process IDs & status for all the processes */
Eric Andersen44608e92002-10-22 12:21:15 +0000442 while ((p = procps_scan(0)) != 0) {
443 int n = ntop;
444
445 top = xrealloc(top, (++ntop)*sizeof(procps_status_t));
446 memcpy(top + n, p, sizeof(procps_status_t));
447 }
448 if (ntop == 0) {
Rob Landleyb2804552006-02-13 22:04:27 +0000449 bb_error_msg_and_die("Can't find process info in /proc");
450 }
"Vladimir N. Oleynik"f246dc72005-09-16 12:55:29 +0000451#ifdef CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE
Rob Landley997650b2006-04-24 23:13:46 +0000452 if (!prev_hist_count) {
Eric Andersen08a72202002-09-30 20:52:10 +0000453 do_stats();
454 sleep(1);
455 clearmems();
456 continue;
Rob Landleyb2804552006-02-13 22:04:27 +0000457 }
Eric Andersen08a72202002-09-30 20:52:10 +0000458 do_stats();
Rob Landley997650b2006-04-24 23:13:46 +0000459 qsort(top, ntop, sizeof(procps_status_t), (void*)mult_lvl_cmp);
Eric Andersen08a72202002-09-30 20:52:10 +0000460#else
Eric Andersen44608e92002-10-22 12:21:15 +0000461 qsort(top, ntop, sizeof(procps_status_t), (void*)sort_function);
"Vladimir N. Oleynik"f246dc72005-09-16 12:55:29 +0000462#endif /* CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE */
Eric Andersen08a72202002-09-30 20:52:10 +0000463 opt = lines;
464 if (opt > ntop) {
465 opt = ntop;
466 }
467 /* show status for each of the processes */
468 display_status(opt, col);
Mike Frysinger223b8872005-07-30 09:42:05 +0000469#ifdef CONFIG_FEATURE_USE_TERMIOS
Eric Andersen08a72202002-09-30 20:52:10 +0000470 tv.tv_sec = interval;
471 tv.tv_usec = 0;
Rob Landley997650b2006-04-24 23:13:46 +0000472 FD_ZERO(&readfds);
473 FD_SET(0, &readfds);
474 select(1, &readfds, NULL, NULL, &tv);
475 if (FD_ISSET(0, &readfds)) {
476 if (read(0, &c, 1) <= 0) { /* signal */
Mike Frysinger223b8872005-07-30 09:42:05 +0000477 return EXIT_FAILURE;
478 }
Rob Landley997650b2006-04-24 23:13:46 +0000479 if (c == 'q' || c == initial_settings.c_cc[VINTR])
"Vladimir N. Oleynik"c218a292006-02-15 17:15:56 +0000480 break;
Rob Landley997650b2006-04-24 23:13:46 +0000481 if (c == 'M') {
"Vladimir N. Oleynik"f246dc72005-09-16 12:55:29 +0000482#ifdef CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE
Eric Andersen08a72202002-09-30 20:52:10 +0000483 sort_function[0] = mem_sort;
484 sort_function[1] = pcpu_sort;
485 sort_function[2] = time_sort;
486#else
487 sort_function = mem_sort;
488#endif
489 }
"Vladimir N. Oleynik"f246dc72005-09-16 12:55:29 +0000490#ifdef CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE
Rob Landley997650b2006-04-24 23:13:46 +0000491 if (c == 'P') {
Eric Andersen08a72202002-09-30 20:52:10 +0000492 sort_function[0] = pcpu_sort;
493 sort_function[1] = mem_sort;
494 sort_function[2] = time_sort;
495 }
Rob Landley997650b2006-04-24 23:13:46 +0000496 if (c == 'T') {
Eric Andersen08a72202002-09-30 20:52:10 +0000497 sort_function[0] = time_sort;
498 sort_function[1] = mem_sort;
499 sort_function[2] = pcpu_sort;
500 }
501#endif
Rob Landley997650b2006-04-24 23:13:46 +0000502 if (c == 'N') {
"Vladimir N. Oleynik"f246dc72005-09-16 12:55:29 +0000503#ifdef CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE
Eric Andersen08a72202002-09-30 20:52:10 +0000504 sort_function[0] = pid_sort;
505#else
506 sort_function = pid_sort;
507#endif
508 }
509 }
510#else
Eric Andersen420b2082002-09-17 22:14:58 +0000511 sleep(interval);
Mike Frysinger223b8872005-07-30 09:42:05 +0000512#endif /* CONFIG_FEATURE_USE_TERMIOS */
Eric Andersen08a72202002-09-30 20:52:10 +0000513 clearmems();
Eric Andersen420b2082002-09-17 22:14:58 +0000514 }
Rob Landley997650b2006-04-24 23:13:46 +0000515 if (ENABLE_FEATURE_CLEAN_UP)
"Vladimir N. Oleynik"c218a292006-02-15 17:15:56 +0000516 clearmems();
517 putchar('\n');
Eric Andersen420b2082002-09-17 22:14:58 +0000518 return EXIT_SUCCESS;
519}