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ede/ede-panel/applets/cpu-monitor/CpuMonitor.cpp

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/*
* IceWM
*
* Copyright (C) 1998-2001 Marko Macek
*
* CPU Status
*
* For eWorkPanel by Mikko Lahteenmaki 2003
* For ede-panel by Sanel Zukan 2009
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <limits.h>
#include <unistd.h>
#include <stdarg.h>
#include <ctype.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <FL/Fl.H>
#include <FL/Fl_Group.H>
#include <FL/fl_draw.H>
#include <edelib/Nls.h>
#if defined(linux)
# include <sys/sysinfo.h>
#endif
#ifdef HAVE_KSTAT
# include <kstat.h>
# include <sys/sysinfo.h>
# include <string.h> /* strncmp */
#endif
#if defined(__FreeBSD__) || defined(__OpenBSD__)
# include <sys/param.h>
# include <sys/sysctl.h>
# if defined(__OpenBSD__)
# include <sys/sched.h>
# else
# if __FreeBSD_version < 500101
# include <sys/dkstat.h>
# else
# include <sys/resource.h>
# endif
# endif
# include <sys/stat.h>
#endif
#include "CpuMonitor.h"
#ifdef __FreeBSD__
/* The part ripped from top... */
/*
* Top users/processes display for Unix
* Version 3
*
* This program may be freely redistributed,
* but this entire comment MUST remain intact.
*
* Copyright (c) 1984, 1989, William LeFebvre, Rice University
* Copyright (c) 1989, 1990, 1992, William LeFebvre, Northwestern University
*/
/*
* percentages(cnt, out, new, old, diffs) - calculate percentage change
* between array "old" and "new", putting the percentages i "out".
* "cnt" is size of each array and "diffs" is used for scratch space.
* The array "old" is updated on each call.
* The routine assumes modulo arithmetic. This function is especially
* useful on BSD mchines for calculating cpu state percentages.
*/
static long cp_time[CPUSTATES];
static long cp_old[CPUSTATES];
static long cp_diff[CPUSTATES];
static int cpu_states[CPUSTATES];
long percentages(int cnt, int *out, long *my_new, long *old, long *diffs)
{
register int i;
register long change;
register long total_change;
register long *dp;
long half_total;
/* initialization */
total_change = 0;
dp = diffs;
/* calculate changes for each state and the overall change */
for (i = 0; i < cnt; i++)
{
if ((change = *my_new - *old) < 0)
{
/* this only happens when the counter wraps */
change = (int)
((unsigned long)*my_new-(unsigned long)*old);
}
total_change += (*dp++ = change);
*old++ = *my_new++;
}
/* avoid divide by zero potential */
if (total_change == 0)
{
total_change = 1;
}
/* calculate percentages based on overall change, rounding up */
half_total = total_change / 2l;
/* Do not divide by 0. Causes Floating point exception */
if(total_change) {
for (i = 0; i < cnt; i++)
{
*out++ = (int)((*diffs++ * 1000 + half_total) / total_change);
}
}
/* return the total in case the caller wants to use it */
return total_change;
}
#endif /* freebsd */
#define UPDATE_INTERVAL .5f
void cpu_timeout_cb(void *d) {
((CPUMonitor*)d)->update_status();
Fl::repeat_timeout(UPDATE_INTERVAL, cpu_timeout_cb, d);
}
CPUMonitor::CPUMonitor() : Fl_Box(0, 0, 45, 25)
{
box(FL_THIN_DOWN_BOX);
m_draw_label = true;
m_samples = m_old_samples = -1;
cpu = 0;
colors[IWM_USER] = FL_RED;
colors[IWM_NICE] = FL_GREEN;
colors[IWM_SYS] = FL_DARK3;
colors[IWM_IDLE] = FL_BACKGROUND_COLOR;
layout();
}
void CPUMonitor::clear()
{
if(!cpu) return;
for (int i = 0; i < samples(); i++)
delete [] cpu[i];
delete [] cpu;
cpu = 0;
m_old_samples = -1;
}
void CPUMonitor::draw()
{
draw_box();
if(!cpu && label()) {
draw_label();
return;
}
int n, c, user, nice, sys, idle, total;
int W = w() - Fl::box_dw(box());
int H = h() - Fl::box_dh(box());
int X = x() + Fl::box_dx(box());
int Y = y() + Fl::box_dy(box());
fl_push_clip(X, Y, W, H);
c = 0;
for (int i = X; i < samples() + X; i++) {
user = cpu[c][IWM_USER];
nice = cpu[c][IWM_NICE];
sys = cpu[c][IWM_SYS];
idle = cpu[c][IWM_IDLE];
total = user + sys + nice + idle;
c++;
int y = Y + H;
if (total > 0) {
if (sys) {
n = (H * (total - sys)) / total; // check rounding
if (n >= y) n = y;
if (n < 1) n = 1;
fl_color(colors[IWM_SYS]);
fl_line(i, y, i, n);
y = n - 1;
}
if (nice) {
n = (H * (total - sys - nice)) / total;
if (n >= y) n = y;
if (n < 1) n = 1;
fl_color(colors[IWM_NICE]);
fl_line(i, y, i, n);
y = n - 1;
}
if (user) {
n = (H * (total - sys - nice - user)) / total;
if (n >= y) n = y;
if (n < 1) n = 1;
fl_color(colors[IWM_USER]);
fl_line(i, y, i, n);
y = n - 1;
}
}
if (idle) {
if(colors[IWM_IDLE] != FL_BACKGROUND_COLOR) {
fl_color(colors[IWM_IDLE]);
fl_line(i, Fl::box_dy(box()), i, y);
}
}
}
draw_label();
fl_pop_clip();
}
void CPUMonitor::layout() {
m_samples = w() - Fl::box_dw(box());
if(!cpu || m_old_samples != m_samples) {
clear();
cpu = new int*[m_samples];
for(int i=0; i < m_samples; i++) {
cpu[i] = new int[IWM_STATES];
cpu[i][IWM_USER] = cpu[i][IWM_NICE] = cpu[i][IWM_SYS] = 0;
cpu[i][IWM_IDLE] = 1;
}
last_cpu[IWM_USER] = last_cpu[IWM_NICE] = last_cpu[IWM_SYS] = last_cpu[IWM_IDLE] = 0;
update_status();
m_old_samples = m_samples;
}
}
int CPUMonitor::handle(int e) {
switch(e) {
case FL_SHOW: {
int ret = Fl_Box::handle(e);
Fl::add_timeout(UPDATE_INTERVAL, cpu_timeout_cb, this);
return ret;
}
case FL_HIDE:
Fl::remove_timeout(cpu_timeout_cb);
/* fallthrough */
}
return Fl_Box::handle(e);
}
void CPUMonitor::update_status() {
if(!cpu) return;
for (int i=1; i < samples(); i++) {
cpu[i - 1][IWM_USER] = cpu[i][IWM_USER];
cpu[i - 1][IWM_NICE] = cpu[i][IWM_NICE];
cpu[i - 1][IWM_SYS] = cpu[i][IWM_SYS];
cpu[i - 1][IWM_IDLE] = cpu[i][IWM_IDLE];
}
get_cpu_info();
// Update tooltip
static char load[255];
snprintf(load, sizeof(load)-1,
_("CPU Load\n"
"User: %d%%\n"
"Nice: %d%%\n"
"Sys: %d%%\n"
"Idle: %d%%"),
cpu[samples()-1][0]*2, cpu[samples()-1][1]*2,
cpu[samples()-1][2]*2, cpu[samples()-1][3]*2);
// Update label
int cpu_percent = cpu[samples()-1][0]*2;
if(m_draw_label && cpu_percent<=100) {
static char buf[16];
snprintf(buf, sizeof(buf), "%i%%", cpu_percent);
label(buf);
}
tooltip(load);
}
void CPUMonitor::get_cpu_info() {
if(!cpu) return;
#ifdef linux
char *p, buf[128];
long cur[IWM_STATES];
int len, fd = open("/proc/stat", O_RDONLY);
cpu[samples()-1][IWM_USER] = 0;
cpu[samples()-1][IWM_NICE] = 0;
cpu[samples()-1][IWM_SYS] = 0;
cpu[samples()-1][IWM_IDLE] = 0;
if (fd == -1)
return;
len = read(fd, buf, sizeof(buf) - 1);
if (len != sizeof(buf) - 1) {
close(fd);
return;
}
buf[len] = 0;
p = buf;
while (*p && (*p < '0' || *p > '9'))
p++;
for (int i = 0; i < 4; i++) {
cur[i] = strtoul(p, &p, 10);
cpu[samples()-1][i] = cur[i] - last_cpu[i];
last_cpu[i] = cur[i];
}
close(fd);
#if 0
fprintf(stderr, "cpu: %d %d %d %d\n",
cpu[samples()-1][IWM_USER], cpu[samples()-1][IWM_NICE],
cpu[samples()-1][IWM_SYS], cpu[samples()-1][IWM_IDLE]);
#endif
#endif /* linux */
#ifdef HAVE_KSTAT
# ifdef HAVE_OLD_KSTAT
# define ui32 ul
#endif
static kstat_ctl_t *kc = NULL;
static kid_t kcid;
kid_t new_kcid;
kstat_t *ks = NULL;
kstat_named_t *kn = NULL;
int changed,change,total_change;
unsigned int thiscpu;
register int i,j;
static unsigned int ncpus;
static kstat_t **cpu_ks=NULL;
static cpu_stat_t *cpu_stat=NULL;
static long cp_old[CPU_STATES];
long cp_time[CPU_STATES], cp_pct[CPU_STATES];
/* Initialize the kstat */
if (!kc) {
kc = kstat_open();
if (!kc) {
perror("kstat_open ");
return;/* FIXME : need err handler? */
}
changed = 1;
kcid = kc->kc_chain_id;
fcntl(kc->kc_kd, F_SETFD, FD_CLOEXEC);
} else {
changed = 0;
}
/* Fetch the kstat data. Whenever we detect that the kstat has been
changed by the kernel, we 'continue' and restart this loop.
Otherwise, we break out at the end. */
while (1) {
new_kcid = kstat_chain_update(kc);
if (new_kcid) {
changed = 1;
kcid = new_kcid;
}
if (new_kcid < 0) {
perror("kstat_chain_update ");
return;/* FIXME : need err handler? */
}
if (new_kcid != 0)
continue; /* kstat changed - start over */
ks = kstat_lookup(kc, "unix", 0, "system_misc");
if (kstat_read(kc, ks, 0) == -1) {
perror("kstat_read ");
return;/* FIXME : need err handler? */
}
if (changed) {
/* the kstat has changed - reread the data */
thiscpu = 0; ncpus = 0;
kn = (kstat_named_t *)kstat_data_lookup(ks, "ncpus");
if ((kn) && (kn->value.ui32 > ncpus)) {
/* I guess I should be using 'new' here... FIXME */
ncpus = kn->value.ui32;
if ((cpu_ks = (kstat_t **)
realloc(cpu_ks, ncpus * sizeof(kstat_t *))) == NULL)
{
perror("realloc: cpu_ks ");
return;/* FIXME : need err handler? */
}
if ((cpu_stat = (cpu_stat_t *)
realloc(cpu_stat, ncpus * sizeof(cpu_stat_t))) == NULL)
{
perror("realloc: cpu_stat ");
return;/* FIXME : need err handler? */
}
}
for (ks = kc->kc_chain; ks; ks = ks->ks_next) {
if (strncmp(ks->ks_name, "cpu_stat", 8) == 0) {
new_kcid = kstat_read(kc, ks, NULL);
if (new_kcid < 0) {
perror("kstat_read ");
return;/* FIXME : need err handler? */
}
if (new_kcid != kcid)
break;
cpu_ks[thiscpu] = ks;
thiscpu++;
if (thiscpu > ncpus) {
fprintf(stderr, "kstat finds too many cpus: should be %d", ncpus);
return;/* FIXME : need err handler? */
}
}
}
if (new_kcid != kcid)
continue;
ncpus = thiscpu;
changed = 0;
}
for (i = 0; i<(int)ncpus; i++) {
new_kcid = kstat_read(kc, cpu_ks[i], &cpu_stat[i]);
if (new_kcid < 0) {
perror("kstat_read ");
return;/* FIXME : need err handler? */
}
}
if (new_kcid != kcid)
continue; /* kstat changed - start over */
else
break;
} /* while (1) */
/* Initialize the cp_time array */
for (i = 0; i < CPU_STATES; i++)
cp_time[i] = 0L;
for (i = 0; i < (int)ncpus; i++) {
for (j = 0; j < CPU_STATES; j++)
cp_time[j] += (long) cpu_stat[i].cpu_sysinfo.cpu[j];
}
/* calculate the percent utilization for each category */
/* cpu_state calculations */
total_change = 0;
for (i = 0; i < CPU_STATES; i++) {
change = cp_time[i] - cp_old[i];
if (change < 0) /* The counter rolled over */
change = (int) ((unsigned long)cp_time[i] - (unsigned long)cp_old[i]);
cp_pct[i] = change;
total_change += change;
cp_old[i] = cp_time[i]; /* copy the data for the next run */
}
/* this percent calculation isn't really needed, since the repaint
routine takes care of this... */
for (i = 0; i < CPU_STATES; i++)
cp_pct[i] =
((total_change > 0) ?
((int)(((1000.0 * (float)cp_pct[i]) / total_change) + 0.5)) :
((i == CPU_IDLE) ? (1000) : (0)));
/* OK, we've got the data. Now copy it to cpu[][] */
cpu[samples()-1][IWM_USER] = cp_pct[CPU_USER];
cpu[samples()-1][IWM_NICE] = cp_pct[CPU_WAIT];
cpu[samples()-1][IWM_SYS] = cp_pct[CPU_KERNEL];
cpu[samples()-1][IWM_IDLE] = cp_pct[CPU_IDLE];
#endif /* have_kstat_h */
#ifdef __FreeBSD__
size_t len = sizeof(cp_time);
cpu[samples()-1][IWM_USER] = 0;
cpu[samples()-1][IWM_NICE] = 0;
cpu[samples()-1][IWM_SYS] = 0;
cpu[samples()-1][IWM_IDLE] = 0;
if (sysctlbyname("kern.cp_time", &cp_time, &len, NULL, 0) == -1)
return; /* FIXME : need err handler? */
percentages(CPUSTATES, cpu_states, cp_time, cp_old, cp_diff);
// Translate FreeBSD stuff into ours (probably the same thing anyway)
cpu[samples()-1][IWM_USER] = cp_diff[CP_USER];
cpu[samples()-1][IWM_NICE] = cp_diff[CP_NICE];
cpu[samples()-1][IWM_SYS] = cp_diff[CP_SYS];
cpu[samples()-1][IWM_IDLE] = cp_diff[CP_IDLE];
#if 0
fprintf(stderr, "cpu: %d %d %d %d\n",
cpu[samples()-1][IWM_USER], cpu[samples()-1][IWM_NICE],
cpu[samples()-1][IWM_SYS], cpu[samples()-1][IWM_IDLE]);
#endif
#endif /* freebsd */
}
EDE_PANEL_APPLET_EXPORT (
CPUMonitor,
EDE_PANEL_APPLET_OPTION_ALIGN_RIGHT,
"CPU monitor",
"0.1",
"empty",
"various"
)
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