hush/procps/top.c

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/* vi: set sw=4 ts=4: */
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/*
* A tiny 'top' utility.
*
* This is written specifically for the linux /proc/<PID>/stat(m)
* files format.
* This reads the PIDs of all processes and their status and shows
* the status of processes (first ones that fit to screen) at given
* intervals.
*
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* NOTES:
* - At startup this changes to /proc, all the reads are then
* relative to that.
*
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* (C) Eero Tamminen <oak at welho dot com>
*
* Rewritten by Vladimir Oleynik (C) 2002 <dzo@simtreas.ru>
*/
/* Original code Copyrights */
/*
* Copyright (c) 1992 Branko Lankester
* Copyright (c) 1992 Roger Binns
* Copyright (C) 1994-1996 Charles L. Blake.
* Copyright (C) 1992-1998 Michael K. Johnson
* May be distributed under the conditions of the
* GNU Library General Public License
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*/
#include "busybox.h"
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//#define CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE /* + 2k */
typedef int (*cmp_t)(procps_status_t *P, procps_status_t *Q);
static procps_status_t *top; /* Hehe */
static int ntop;
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#ifdef CONFIG_FEATURE_USE_TERMIOS
static int pid_sort(procps_status_t *P, procps_status_t *Q)
{
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return (Q->pid - P->pid);
}
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#endif
static int mem_sort(procps_status_t *P, procps_status_t *Q)
{
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return (int)(Q->rss - P->rss);
}
#ifdef CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE
#define sort_depth 3
static cmp_t sort_function[sort_depth];
static int pcpu_sort(procps_status_t *P, procps_status_t *Q)
{
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return (Q->pcpu - P->pcpu);
}
static int time_sort(procps_status_t *P, procps_status_t *Q)
{
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return (int)((Q->stime + Q->utime) - (P->stime + P->utime));
}
static int mult_lvl_cmp(void* a, void* b) {
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int i, cmp_val;
for (i = 0; i < sort_depth; i++) {
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cmp_val = (*sort_function[i])(a, b);
if (cmp_val != 0)
return cmp_val;
}
return 0;
}
/* This structure stores some critical information from one frame to
the next. mostly used for sorting. Added cumulative and resident fields. */
struct save_hist {
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int ticks;
int pid;
};
/*
* Calculates percent cpu usage for each task.
*/
static struct save_hist *prev_hist;
static int prev_hist_count;
/* static int hist_iterations; */
static unsigned total_pcpu;
/* static unsigned long total_rss; */
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struct jiffy_counts {
unsigned long long usr,nic,sys,idle,iowait,irq,softirq,steal;
unsigned long long total;
unsigned long long busy;
};
static struct jiffy_counts jif, prev_jif;
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static void get_jiffy_counts(void)
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{
FILE* fp = xfopen("stat", "r");
prev_jif = jif;
if (fscanf(fp, "cpu %lld %lld %lld %lld %lld %lld %lld %lld",
&jif.usr,&jif.nic,&jif.sys,&jif.idle,
&jif.iowait,&jif.irq,&jif.softirq,&jif.steal) < 4) {
bb_error_msg_and_die("failed to read 'stat'");
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}
fclose(fp);
jif.total = jif.usr + jif.nic + jif.sys + jif.idle
+ jif.iowait + jif.irq + jif.softirq + jif.steal;
/* procps 2.x does not count iowait as busy time */
jif.busy = jif.total - jif.idle - jif.iowait;
}
static void do_stats(void)
{
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procps_status_t *cur;
int pid, total_time, i, last_i, n;
struct save_hist *new_hist;
get_jiffy_counts();
total_pcpu = 0;
/* total_rss = 0; */
new_hist = xmalloc(sizeof(struct save_hist)*ntop);
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/*
* Make a pass through the data to get stats.
*/
/* hist_iterations = 0; */
i = 0;
for (n = 0; n < ntop; n++) {
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cur = top + n;
/*
* Calculate time in cur process. Time is sum of user time
* and system time
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*/
pid = cur->pid;
total_time = cur->stime + cur->utime;
new_hist[n].ticks = total_time;
new_hist[n].pid = pid;
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/* find matching entry from previous pass */
cur->pcpu = 0;
/* do not start at index 0, continue at last used one
* (brought hist_iterations from ~14000 down to 172) */
last_i = i;
if (prev_hist_count) do {
if (prev_hist[i].pid == pid) {
cur->pcpu = total_time - prev_hist[i].ticks;
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break;
}
i = (i+1) % prev_hist_count;
/* hist_iterations++; */
} while (i != last_i);
total_pcpu += cur->pcpu;
/* total_rss += cur->rss; */
}
/*
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* Save cur frame's information.
*/
free(prev_hist);
prev_hist = new_hist;
prev_hist_count = ntop;
}
#else
static cmp_t sort_function;
#endif /* CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE */
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/* display generic info (meminfo / loadavg) */
static unsigned long display_generic(int scr_width)
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{
FILE *fp;
char buf[80];
char scrbuf[80];
char *end;
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unsigned long total, used, mfree, shared, buffers, cached;
unsigned int needs_conversion = 1;
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/* read memory info */
fp = xfopen("meminfo", "r");
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/*
* Old kernels (such as 2.4.x) had a nice summary of memory info that
* we could parse, however this is gone entirely in 2.6. Try parsing
* the old way first, and if that fails, parse each field manually.
*
* First, we read in the first line. Old kernels will have bogus
* strings we don't care about, whereas new kernels will start right
* out with MemTotal:
* -- PFM.
*/
if (fscanf(fp, "MemTotal: %lu %s\n", &total, buf) != 2) {
fgets(buf, sizeof(buf), fp); /* skip first line */
fscanf(fp, "Mem: %lu %lu %lu %lu %lu %lu",
&total, &used, &mfree, &shared, &buffers, &cached);
} else {
/*
* Revert to manual parsing, which incidentally already has the
* sizes in kilobytes. This should be safe for both 2.4 and
* 2.6.
*/
needs_conversion = 0;
fscanf(fp, "MemFree: %lu %s\n", &mfree, buf);
/*
* MemShared: is no longer present in 2.6. Report this as 0,
* to maintain consistent behavior with normal procps.
*/
if (fscanf(fp, "MemShared: %lu %s\n", &shared, buf) != 2)
shared = 0;
fscanf(fp, "Buffers: %lu %s\n", &buffers, buf);
fscanf(fp, "Cached: %lu %s\n", &cached, buf);
used = total - mfree;
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}
fclose(fp);
/* read load average as a string */
fp = xfopen("loadavg", "r");
buf[0] = '\0';
fgets(buf, sizeof(buf), fp);
end = strchr(buf, ' ');
if (end) end = strchr(end+1, ' ');
if (end) end = strchr(end+1, ' ');
if (end) *end = '\0';
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fclose(fp);
if (needs_conversion) {
/* convert to kilobytes */
used /= 1024;
mfree /= 1024;
shared /= 1024;
buffers /= 1024;
cached /= 1024;
total /= 1024;
}
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/* output memory info and load average */
/* clear screen & go to top */
if (scr_width > sizeof(scrbuf))
scr_width = sizeof(scrbuf);
snprintf(scrbuf, scr_width,
"Mem: %ldK used, %ldK free, %ldK shrd, %ldK buff, %ldK cached",
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used, mfree, shared, buffers, cached);
printf("\e[H\e[J%s\n", scrbuf);
snprintf(scrbuf, scr_width,
"Load average: %s (Status: S=sleeping R=running, W=waiting)", buf);
printf("%s\n", scrbuf);
return total;
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}
/* display process statuses */
static void display_status(int count, int scr_width)
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{
enum {
bits_per_int = sizeof(int)*8
};
procps_status_t *s = top;
char rss_str_buf[8];
unsigned long total_memory = display_generic(scr_width); /* or use total_rss? */
unsigned pmem_shift, pmem_scale;
#ifdef CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE
unsigned pcpu_shift, pcpu_scale;
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/* what info of the processes is shown */
printf("\e[7m%.*s\e[0m", scr_width,
" PID USER STATUS RSS PPID %CPU %MEM COMMAND");
#define MIN_WIDTH \
sizeof( " PID USER STATUS RSS PPID %CPU %MEM C")
#else
printf("\e[7m%.*s\e[0m", scr_width,
" PID USER STATUS RSS PPID %MEM COMMAND");
#define MIN_WIDTH \
sizeof( " PID USER STATUS RSS PPID %MEM C")
#endif
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/*
* MEM% = s->rss/MemTotal
*/
pmem_shift = bits_per_int-11;
pmem_scale = 1000*(1U<<(bits_per_int-11)) / total_memory;
/* s->rss is in kb. we want (s->rss * pmem_scale) to never overflow */
while (pmem_scale >= 512) {
pmem_scale /= 4;
pmem_shift -= 2;
}
#ifdef CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE
/*
* CPU% = s->pcpu/sum(s->pcpu) * busy_cpu_ticks/total_cpu_ticks
* (pcpu is delta of sys+user time between samples)
*/
/* (jif.xxx - prev_jif.xxx) and s->pcpu are
* in 0..~64000 range (HZ*update_interval).
* we assume that unsigned is at least 32-bit.
*/
pcpu_shift = 6;
pcpu_scale = (1000*64*(uint16_t)(jif.busy-prev_jif.busy) ? : 1);
while (pcpu_scale < (1U<<(bits_per_int-2))) {
pcpu_scale *= 4;
pcpu_shift += 2;
}
pcpu_scale /= ( (uint16_t)(jif.total-prev_jif.total)*total_pcpu ? : 1);
/* we want (s->pcpu * pcpu_scale) to never overflow */
while (pcpu_scale >= 1024) {
pcpu_scale /= 4;
pcpu_shift -= 2;
}
/* printf(" pmem_scale=%u pcpu_scale=%u ", pmem_scale, pcpu_scale); */
#endif
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while (count--) {
div_t pmem = div( (s->rss*pmem_scale) >> pmem_shift, 10);
int col = scr_width+1;
USE_FEATURE_TOP_CPU_USAGE_PERCENTAGE(div_t pcpu;)
if (s->rss >= 100*1024)
sprintf(rss_str_buf, "%6ldM", s->rss/1024);
else
sprintf(rss_str_buf, "%7ld", s->rss);
USE_FEATURE_TOP_CPU_USAGE_PERCENTAGE(pcpu = div((s->pcpu*pcpu_scale) >> pcpu_shift, 10);)
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col -= printf("\n%5d %-8s %s %s%6d%3u.%c" \
USE_FEATURE_TOP_CPU_USAGE_PERCENTAGE("%3u.%c") " ",
s->pid, s->user, s->state, rss_str_buf, s->ppid,
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USE_FEATURE_TOP_CPU_USAGE_PERCENTAGE(pcpu.quot, '0'+pcpu.rem,)
pmem.quot, '0'+pmem.rem);
if (col>0)
printf("%.*s", col, s->short_cmd);
/* printf(" %d/%d %lld/%lld", s->pcpu, total_pcpu,
jif.busy - prev_jif.busy, jif.total - prev_jif.total); */
s++;
}
/* printf(" %d", hist_iterations); */
putchar('\r');
fflush(stdout);
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}
static void clearmems(void)
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{
free(top);
top = 0;
ntop = 0;
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}
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#ifdef CONFIG_FEATURE_USE_TERMIOS
#include <termios.h>
#include <signal.h>
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static struct termios initial_settings;
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static void reset_term(void)
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{
tcsetattr(0, TCSANOW, (void *) &initial_settings);
#ifdef CONFIG_FEATURE_CLEAN_UP
clearmems();
#ifdef CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE
free(prev_hist);
#endif
#endif /* CONFIG_FEATURE_CLEAN_UP */
}
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static void sig_catcher(int sig ATTRIBUTE_UNUSED)
{
reset_term();
exit(1);
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}
#endif /* CONFIG_FEATURE_USE_TERMIOS */
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int top_main(int argc, char **argv)
{
int opt, interval, lines, col;
char *sinterval;
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#ifdef CONFIG_FEATURE_USE_TERMIOS
struct termios new_settings;
struct timeval tv;
fd_set readfds;
unsigned char c;
#endif /* CONFIG_FEATURE_USE_TERMIOS */
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/* do normal option parsing */
opt = bb_getopt_ulflags(argc, argv, "d:", &sinterval);
if ((opt & 1)) {
interval = atoi(sinterval);
} else {
/* Default update rate is 5 seconds */
interval = 5;
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}
/* change to /proc */
xchdir("/proc");
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#ifdef CONFIG_FEATURE_USE_TERMIOS
tcgetattr(0, (void *) &initial_settings);
memcpy(&new_settings, &initial_settings, sizeof(struct termios));
new_settings.c_lflag &= ~(ISIG | ICANON); /* unbuffered input */
/* Turn off echoing */
new_settings.c_lflag &= ~(ECHO | ECHONL);
signal(SIGTERM, sig_catcher);
signal(SIGINT, sig_catcher);
tcsetattr(0, TCSANOW, (void *) &new_settings);
atexit(reset_term);
#endif /* CONFIG_FEATURE_USE_TERMIOS */
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#ifdef CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE
sort_function[0] = pcpu_sort;
sort_function[1] = mem_sort;
sort_function[2] = time_sort;
#else
sort_function = mem_sort;
#endif /* CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE */
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while (1) {
procps_status_t *p;
/* Default to 25 lines - 5 lines for status */
lines = 24 - 3;
col = 79;
#ifdef CONFIG_FEATURE_USE_TERMIOS
get_terminal_width_height(0, &col, &lines);
if (lines < 5 || col < MIN_WIDTH) {
sleep(interval);
continue;
}
lines -= 3;
#endif /* CONFIG_FEATURE_USE_TERMIOS */
/* read process IDs & status for all the processes */
while ((p = procps_scan(0)) != 0) {
int n = ntop;
top = xrealloc(top, (++ntop)*sizeof(procps_status_t));
memcpy(top + n, p, sizeof(procps_status_t));
}
if (ntop == 0) {
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bb_error_msg_and_die("Can't find process info in /proc");
}
#ifdef CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE
if (!prev_hist_count) {
do_stats();
sleep(1);
clearmems();
continue;
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}
do_stats();
qsort(top, ntop, sizeof(procps_status_t), (void*)mult_lvl_cmp);
#else
qsort(top, ntop, sizeof(procps_status_t), (void*)sort_function);
#endif /* CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE */
opt = lines;
if (opt > ntop) {
opt = ntop;
}
/* show status for each of the processes */
display_status(opt, col);
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#ifdef CONFIG_FEATURE_USE_TERMIOS
tv.tv_sec = interval;
tv.tv_usec = 0;
FD_ZERO(&readfds);
FD_SET(0, &readfds);
select(1, &readfds, NULL, NULL, &tv);
if (FD_ISSET(0, &readfds)) {
if (read(0, &c, 1) <= 0) { /* signal */
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return EXIT_FAILURE;
}
if (c == 'q' || c == initial_settings.c_cc[VINTR])
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break;
if (c == 'M') {
#ifdef CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE
sort_function[0] = mem_sort;
sort_function[1] = pcpu_sort;
sort_function[2] = time_sort;
#else
sort_function = mem_sort;
#endif
}
#ifdef CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE
if (c == 'P') {
sort_function[0] = pcpu_sort;
sort_function[1] = mem_sort;
sort_function[2] = time_sort;
}
if (c == 'T') {
sort_function[0] = time_sort;
sort_function[1] = mem_sort;
sort_function[2] = pcpu_sort;
}
#endif
if (c == 'N') {
#ifdef CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE
sort_function[0] = pid_sort;
#else
sort_function = pid_sort;
#endif
}
}
#else
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sleep(interval);
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#endif /* CONFIG_FEATURE_USE_TERMIOS */
clearmems();
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}
if (ENABLE_FEATURE_CLEAN_UP)
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clearmems();
putchar('\n');
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return EXIT_SUCCESS;
}