ede/ede-panel/applets/cpu-monitor/CpuMonitor.cpp
Sanel Zukan 1dde9f92da Menu reload support and clean of some memory leaks.
Menu reload is using DirWatch to monitor application menu folders for changes. With this, any change on some content will trigger
menu update. Update is trying to be safe as possible: when menu is open, a backup menu will be constructed and replaced as soon as menu
was closed; when is closed, it will be directly replaced.

This still can include races, but I'm hoping they will not occur.

Related to memory leaks: on couple of places in cpu applet, delete was wronly called instead delete[]. Also, when ede-panel exits,
AppletManager would not clean loaded apples. Strange. So now explicit clear was added on exit.
2012-08-06 14:52:09 +00:00

515 lines
12 KiB
C++

/*
* IceWM
*
* Copyright (C) 1998-2001 Marko Macek
*
* CPU Status
*
* For eWorkPanel by Mikko Lahteenmaki 2003
* For ede-panel by Sanel Zukan 2009
*/
#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_H
# include <kstat.h>
#endif
#ifdef __FreeBSD__
# include <sys/param.h>
# include <sys/sysctl.h>
# if __FreeBSD_version < 500101
# include <sys/dkstat.h>
# else
# include <sys/resource.h>
# 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_H
# 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"
)