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hush/procps/top.c

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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.
*
* NOTES:
* - At startup this changes to /proc, all the reads are then
* relative to that.
*
* (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
*/
#include <sys/types.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/ioctl.h>
#include "busybox.h"
//#define CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE /* + 2k */
#ifdef CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE
#include <time.h>
#include <sys/time.h>
#include <fcntl.h>
#include <netinet/in.h> /* htons */
#endif
typedef int (*cmp_t)(procps_status_t *P, procps_status_t *Q);
static procps_status_t *top; /* Hehe */
static int ntop;
#ifdef CONFIG_FEATURE_USE_TERMIOS
static int pid_sort (procps_status_t *P, procps_status_t *Q)
{
return (Q->pid - P->pid);
}
#endif
static int mem_sort (procps_status_t *P, procps_status_t *Q)
{
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)
{
return (Q->pcpu - P->pcpu);
}
static int time_sort (procps_status_t *P, procps_status_t *Q)
{
return (int)((Q->stime + Q->utime) - (P->stime + P->utime));
}
static int mult_lvl_cmp(void* a, void* b) {
int i, cmp_val;
for(i = 0; i < sort_depth; i++) {
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 {
int ticks;
int pid;
int utime;
int stime;
};
/*
* Calculates percent cpu usage for each task.
*/
static struct save_hist *save_history;
static unsigned long Hertz;
/***********************************************************************
* Some values in /proc are expressed in units of 1/HZ seconds, where HZ
* is the kernel clock tick rate. One of these units is called a jiffy.
* The HZ value used in the kernel may vary according to hacker desire.
* According to Linus Torvalds, this is not true. He considers the values
* in /proc as being in architecture-dependent units that have no relation
* to the kernel clock tick rate. Examination of the kernel source code
* reveals that opinion as wishful thinking.
*
* In any case, we need the HZ constant as used in /proc. (the real HZ value
* may differ, but we don't care) There are several ways we could get HZ:
*
* 1. Include the kernel header file. If it changes, recompile this library.
* 2. Use the sysconf() function. When HZ changes, recompile the C library!
* 3. Ask the kernel. This is obviously correct...
*
* Linus Torvalds won't let us ask the kernel, because he thinks we should
* not know the HZ value. Oh well, we don't have to listen to him.
* Someone smuggled out the HZ value. :-)
*
* This code should work fine, even if Linus fixes the kernel to match his
* stated behavior. The code only fails in case of a partial conversion.
*
*/
#define FILE_TO_BUF(filename, fd) do{ \
if (fd == -1 && (fd = open(filename, O_RDONLY)) == -1) { \
bb_perror_msg_and_die("/proc not be mounted?"); \
} \
lseek(fd, 0L, SEEK_SET); \
if ((local_n = read(fd, buf, sizeof buf - 1)) < 0) { \
bb_perror_msg_and_die("%s", filename); \
} \
buf[local_n] = '\0'; \
}while(0)
#define FILE_TO_BUF2(filename, fd) do{ \
lseek(fd, 0L, SEEK_SET); \
if ((local_n = read(fd, buf, sizeof buf - 1)) < 0) { \
bb_perror_msg_and_die("%s", filename); \
} \
buf[local_n] = '\0'; \
}while(0)
static void init_Hertz_value(void) {
unsigned long user_j, nice_j, sys_j, other_j; /* jiffies (clock ticks) */
double up_1, up_2, seconds;
unsigned long jiffies, h;
char buf[80];
int uptime_fd = -1;
int stat_fd = -1;
long smp_num_cpus = sysconf(_SC_NPROCESSORS_CONF);
if(smp_num_cpus<1) smp_num_cpus=1;
do {
int local_n;
FILE_TO_BUF("uptime", uptime_fd);
up_1 = strtod(buf, 0);
FILE_TO_BUF("stat", stat_fd);
sscanf(buf, "cpu %lu %lu %lu %lu", &user_j, &nice_j, &sys_j, &other_j);
FILE_TO_BUF2("uptime", uptime_fd);
up_2 = strtod(buf, 0);
} while((long)( (up_2-up_1)*1000.0/up_1 )); /* want under 0.1% error */
close(uptime_fd);
close(stat_fd);
jiffies = user_j + nice_j + sys_j + other_j;
seconds = (up_1 + up_2) / 2;
h = (unsigned long)( (double)jiffies/seconds/smp_num_cpus );
/* actual values used by 2.4 kernels: 32 64 100 128 1000 1024 1200 */
switch(h){
case 30 ... 34 : Hertz = 32; break; /* ia64 emulator */
case 48 ... 52 : Hertz = 50; break;
case 58 ... 62 : Hertz = 60; break;
case 63 ... 65 : Hertz = 64; break; /* StrongARM /Shark */
case 95 ... 105 : Hertz = 100; break; /* normal Linux */
case 124 ... 132 : Hertz = 128; break; /* MIPS, ARM */
case 195 ... 204 : Hertz = 200; break; /* normal << 1 */
case 253 ... 260 : Hertz = 256; break;
case 295 ... 304 : Hertz = 300; break; /* 3 cpus */
case 393 ... 408 : Hertz = 400; break; /* normal << 2 */
case 495 ... 504 : Hertz = 500; break; /* 5 cpus */
case 595 ... 604 : Hertz = 600; break; /* 6 cpus */
case 695 ... 704 : Hertz = 700; break; /* 7 cpus */
case 790 ... 808 : Hertz = 800; break; /* normal << 3 */
case 895 ... 904 : Hertz = 900; break; /* 9 cpus */
case 990 ... 1010 : Hertz = 1000; break; /* ARM */
case 1015 ... 1035 : Hertz = 1024; break; /* Alpha, ia64 */
case 1095 ... 1104 : Hertz = 1100; break; /* 11 cpus */
case 1180 ... 1220 : Hertz = 1200; break; /* Alpha */
default:
/* If 32-bit or big-endian (not Alpha or ia64), assume HZ is 100. */
Hertz = (sizeof(long)==sizeof(int) || htons(999)==999) ? 100UL : 1024UL;
}
}
static void do_stats(void)
{
struct timeval t;
static struct timeval oldtime;
struct timezone timez;
float elapsed_time;
procps_status_t *cur;
int total_time, i, n;
static int prev_count;
int systime, usrtime, pid;
struct save_hist *New_save_hist;
/*
* Finds the current time (in microseconds) and calculates the time
* elapsed since the last update.
*/
gettimeofday(&t, &timez);
elapsed_time = (t.tv_sec - oldtime.tv_sec)
+ (float) (t.tv_usec - oldtime.tv_usec) / 1000000.0;
oldtime.tv_sec = t.tv_sec;
oldtime.tv_usec = t.tv_usec;
New_save_hist = alloca(sizeof(struct save_hist)*ntop);
/*
* Make a pass through the data to get stats.
*/
for(n = 0; n < ntop; n++) {
cur = top + n;
/*
* Calculate time in cur process. Time is sum of user time
* (usrtime) plus system time (systime).
*/
systime = cur->stime;
usrtime = cur->utime;
pid = cur->pid;
total_time = systime + usrtime;
New_save_hist[n].ticks = total_time;
New_save_hist[n].pid = pid;
New_save_hist[n].stime = systime;
New_save_hist[n].utime = usrtime;
/* find matching entry from previous pass */
for (i = 0; i < prev_count; i++) {
if (save_history[i].pid == pid) {
total_time -= save_history[i].ticks;
systime -= save_history[i].stime;
usrtime -= save_history[i].utime;
break;
}
}
/*
* Calculate percent cpu time for cur task.
*/
i = (total_time * 10 * 100/Hertz) / elapsed_time;
if (i > 999)
i = 999;
cur->pcpu = i;
}
/*
* Save cur frame's information.
*/
free(save_history);
save_history = memcpy(xmalloc(sizeof(struct save_hist)*n), New_save_hist,
sizeof(struct save_hist)*n);
prev_count = n;
qsort(top, n, sizeof(procps_status_t), (void*)mult_lvl_cmp);
}
#else
static cmp_t sort_function;
#endif /* CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE */
/* display generic info (meminfo / loadavg) */
static unsigned long display_generic(void)
{
FILE *fp;
char buf[80];
float avg1, avg2, avg3;
unsigned long total, used, mfree, shared, buffers, cached;
unsigned int needs_conversion = 1;
/* read memory info */
fp = bb_xfopen("meminfo", "r");
/*
* 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;
}
fclose(fp);
/* read load average */
fp = bb_xfopen("loadavg", "r");
if (fscanf(fp, "%f %f %f", &avg1, &avg2, &avg3) != 3) {
bb_error_msg_and_die("failed to read '%s'", "loadavg");
}
fclose(fp);
if (needs_conversion) {
/* convert to kilobytes */
used /= 1024;
mfree /= 1024;
shared /= 1024;
buffers /= 1024;
cached /= 1024;
total /= 1024;
}
/* output memory info and load average */
/* clear screen & go to top */
printf("\e[H\e[J" "Mem: "
"%ldK used, %ldK free, %ldK shrd, %ldK buff, %ldK cached\n",
used, mfree, shared, buffers, cached);
printf("Load average: %.2f, %.2f, %.2f "
"(State: S=sleeping R=running, W=waiting)\n",
avg1, avg2, avg3);
return total;
}
/* display process statuses */
static void display_status(int count, int col)
{
procps_status_t *s = top;
char rss_str_buf[8];
unsigned long total_memory = display_generic();
#ifdef CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE
/* what info of the processes is shown */
printf("\n\e[7m PID USER STATUS RSS PPID %%CPU %%MEM COMMAND\e[0m\n");
#else
printf("\n\e[7m PID USER STATUS RSS PPID %%MEM COMMAND\e[0m\n");
#endif
while (count--) {
char *namecmd = s->short_cmd;
int pmem;
pmem = 1000.0 * s->rss / total_memory;
if (pmem > 999) pmem = 999;
if(s->rss > 10*1024)
sprintf(rss_str_buf, "%6ldM", s->rss/1024);
else
sprintf(rss_str_buf, "%7ld", s->rss);
#ifdef CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE
printf("%5d %-8s %s %s %5d %2d.%d %2u.%u ",
s->pid, s->user, s->state, rss_str_buf, s->ppid,
s->pcpu/10, s->pcpu%10, pmem/10, pmem%10);
#else
printf("%5d %-8s %s %s %5d %2u.%u ",
s->pid, s->user, s->state, rss_str_buf, s->ppid,
pmem/10, pmem%10);
#endif
if(strlen(namecmd) > col)
namecmd[col] = 0;
printf("%s\n", namecmd);
s++;
}
}
static void clearmems(void)
{
free(top);
top = 0;
ntop = 0;
}
#ifdef CONFIG_FEATURE_USE_TERMIOS
#include <termios.h>
#include <sys/time.h>
#include <signal.h>
static struct termios initial_settings;
static void reset_term(void)
{
tcsetattr(0, TCSANOW, (void *) &initial_settings);
#ifdef CONFIG_FEATURE_CLEAN_UP
clearmems();
#ifdef CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE
free(save_history);
#endif
#endif /* CONFIG_FEATURE_CLEAN_UP */
}
static void sig_catcher (int sig)
{
reset_term();
}
#endif /* CONFIG_FEATURE_USE_TERMIOS */
int top_main(int argc, char **argv)
{
int opt, interval, lines, col;
#ifdef CONFIG_FEATURE_USE_TERMIOS
struct termios new_settings;
struct timeval tv;
fd_set readfds;
unsigned char c;
struct sigaction sa;
#endif /* CONFIG_FEATURE_USE_TERMIOS */
/* Default update rate is 5 seconds */
interval = 5;
/* do normal option parsing */
while ((opt = getopt(argc, argv, "d:")) > 0) {
switch (opt) {
case 'd':
interval = atoi(optarg);
break;
default:
bb_show_usage();
}
}
/* Default to 25 lines - 5 lines for status */
lines = 25 - 5;
/* Default CMD format size */
#ifdef CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE
col = 35 - 6;
#else
col = 35;
#endif
/* change to /proc */
if (chdir("/proc") < 0) {
bb_perror_msg_and_die("chdir('/proc')");
}
#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);
sigaction (SIGTERM, (struct sigaction *) 0, &sa);
sa.sa_flags |= SA_RESTART;
sa.sa_flags &= ~SA_INTERRUPT;
sigaction (SIGTERM, &sa, (struct sigaction *) 0);
sigaction (SIGINT, &sa, (struct sigaction *) 0);
tcsetattr(0, TCSANOW, (void *) &new_settings);
atexit(reset_term);
get_terminal_width_height(0, &col, &lines);
if (lines > 4) {
lines -= 5;
#ifdef CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE
col = col - 80 + 35 - 6;
#else
col = col - 80 + 35;
#endif
}
#endif /* CONFIG_FEATURE_USE_TERMIOS */
#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 */
while (1) {
/* read process IDs & status for all the processes */
procps_status_t * p;
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) {
bb_perror_msg_and_die("scandir('/proc')");
}
#ifdef CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE
if(!Hertz) {
init_Hertz_value();
do_stats();
sleep(1);
clearmems();
continue;
}
do_stats();
#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);
#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 */
return EXIT_FAILURE;
}
if(c == 'q' || c == initial_settings.c_cc[VINTR])
return EXIT_SUCCESS;
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
sleep(interval);
#endif /* CONFIG_FEATURE_USE_TERMIOS */
clearmems();
}
return EXIT_SUCCESS;
}
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