ref: ce1edc34368d192db7d3421673ca98c19cc792b2
dir: /sys/src/cmd/ip/gping.c/
#include <u.h>
#include <libc.h>
#include <ctype.h>
#include <auth.h>
#include <fcall.h>
#include <draw.h>
#include <event.h>
#include <ip.h>
#include "icmp.h"
#define MAXNUM 8 /* maximum number of numbers on data line */
typedef struct Graph Graph;
typedef struct Machine Machine;
typedef struct Req Req;
enum {
Gmsglen = 16,
};
struct Graph
{
int colindex;
Rectangle r;
long *data;
int ndata;
char *label;
void (*newvalue)(Machine*, long*, long*, long*);
void (*update)(Graph*, long, long, long);
Machine *mach;
int overflow;
Image *overtmp;
int overtmplen;
char msg[Gmsglen];
int cursor;
int vmax;
};
enum
{
MSGLEN = 64,
Rttmax = 50,
};
struct Req
{
int seq; /* sequence number */
vlong time; /* time sent */
// int rtt;
Req *next;
};
struct Machine
{
Lock;
char *name;
int pingfd;
int nproc;
int rttmsgs;
ulong rttsum;
ulong lastrtt;
int lostmsgs;
int rcvdmsgs;
ulong lostavg;
int unreachable;
ushort seq;
Req *first;
Req *last;
Req *rcvd;
char buf[1024];
char *bufp;
char *ebufp;
};
enum
{
Ncolor = 6,
Ysqueeze = 2, /* vertical squeezing of label text */
Labspace = 2, /* room around label */
Dot = 2, /* height of dot */
Opwid = 5, /* strlen("add ") or strlen("drop ") */
NPROC = 128,
NMACH = 32,
};
enum Menu2
{
Mrtt,
Mlost,
Nmenu2,
};
char *menu2str[Nmenu2+1] = {
"add sec rtt",
"add % lost ",
nil,
};
void rttval(Machine*, long*, long*, long*);
void lostval(Machine*, long*, long*, long*);
Menu menu2 = {menu2str, nil};
int present[Nmenu2];
void (*newvaluefn[Nmenu2])(Machine*, long*, long*, long*) = {
rttval,
lostval,
};
Image *cols[Ncolor][3];
Graph *graph;
Machine mach[NMACH];
int pids[NPROC];
int npid;
int parity; /* toggled to avoid patterns in textured background */
int nmach;
int ngraph; /* totaly number is ngraph*nmach */
long starttime;
int pinginterval;
void dropgraph(int);
void addgraph(int);
void startproc(void (*)(void*), void*);
void resize(void);
long rttscale(long);
int which2index(int);
int index2which(int);
void
killall(char *s)
{
int i, pid;
pid = getpid();
for(i=0; i<NPROC; i++)
if(pids[i] && pids[i]!=pid)
postnote(PNPROC, pids[i], "kill");
exits(s);
}
void*
emalloc(ulong sz)
{
void *v;
v = malloc(sz);
if(v == nil) {
fprint(2, "%s: out of memory allocating %ld: %r\n", argv0, sz);
killall("mem");
}
memset(v, 0, sz);
return v;
}
void*
erealloc(void *v, ulong sz)
{
v = realloc(v, sz);
if(v == nil) {
fprint(2, "%s: out of memory reallocating %ld: %r\n", argv0, sz);
killall("mem");
}
return v;
}
char*
estrdup(char *s)
{
char *t;
if((t = strdup(s)) == nil) {
fprint(2, "%s: out of memory in strdup(%.10s): %r\n", argv0, s);
killall("mem");
}
return t;
}
void
mkcol(int i, int c0, int c1, int c2)
{
cols[i][0] = allocimagemix(display, c0, DWhite);
cols[i][1] = allocimage(display, Rect(0,0,1,1), CMAP8, 1, c1);
cols[i][2] = allocimage(display, Rect(0,0,1,1), CMAP8, 1, c2);
}
void
colinit(void)
{
/* Peach */
mkcol(0, 0xFFAAAAFF, 0xFFAAAAFF, 0xBB5D5DFF);
/* Aqua */
mkcol(1, DPalebluegreen, DPalegreygreen, DPurpleblue);
/* Yellow */
mkcol(2, DPaleyellow, DDarkyellow, DYellowgreen);
/* Green */
mkcol(3, DPalegreen, DMedgreen, DDarkgreen);
/* Blue */
mkcol(4, 0x00AAFFFF, 0x00AAFFFF, 0x0088CCFF);
/* Grey */
cols[5][0] = allocimage(display, Rect(0,0,1,1), CMAP8, 1, 0xEEEEEEFF);
cols[5][1] = allocimage(display, Rect(0,0,1,1), CMAP8, 1, 0xCCCCCCFF);
cols[5][2] = allocimage(display, Rect(0,0,1,1), CMAP8, 1, 0x888888FF);
}
void
label(Point p, int dy, char *text)
{
char *s;
Rune r[2];
int w, maxw, maxy;
p.x += Labspace;
maxy = p.y+dy;
maxw = 0;
r[1] = '\0';
for(s=text; *s; ){
if(p.y+font->height-Ysqueeze > maxy)
break;
w = chartorune(r, s);
s += w;
w = runestringwidth(font, r);
if(w > maxw)
maxw = w;
runestring(screen, p, display->black, ZP, font, r);
p.y += font->height-Ysqueeze;
}
}
void
hashmark(Point p, int dy, long v, long vmax, char *label)
{
int y;
int x;
x = p.x + Labspace;
y = p.y + (dy*(vmax-v))/vmax;
draw(screen, Rect(p.x, y-1, p.x+Labspace, y+1), display->black, nil, ZP);
if(dy > 5*font->height)
string(screen, Pt(x, y-font->height/2),
display->black, ZP, font, label);
}
void
hashmarks(Point p, int dy, int which)
{
switch(index2which(which)){
case Mrtt:
hashmark(p, dy, rttscale(1000000), Rttmax, "1.");
hashmark(p, dy, rttscale(100000), Rttmax, "0.1");
hashmark(p, dy, rttscale(10000), Rttmax, "0.01");
hashmark(p, dy, rttscale(1000), Rttmax, "0.001");
break;
case Mlost:
hashmark(p, dy, 75, 100, " 75%");
hashmark(p, dy, 50, 100, " 50%");
hashmark(p, dy, 25, 100, " 25%");
break;
}
}
Point
paritypt(int x)
{
return Pt(x+parity, 0);
}
Point
datapoint(Graph *g, int x, long v, long vmax)
{
Point p;
p.x = x;
p.y = g->r.max.y - Dy(g->r)*v/vmax - Dot;
if(p.y < g->r.min.y)
p.y = g->r.min.y;
if(p.y > g->r.max.y-Dot)
p.y = g->r.max.y-Dot;
return p;
}
void
drawdatum(Graph *g, int x, long prev, long v, long vmax)
{
int c;
Point p, q;
c = g->colindex;
p = datapoint(g, x, v, vmax);
q = datapoint(g, x, prev, vmax);
if(p.y < q.y){
draw(screen, Rect(p.x, g->r.min.y, p.x+1, p.y), cols[c][0], nil, paritypt(p.x));
draw(screen, Rect(p.x, p.y, p.x+1, q.y+Dot), cols[c][2], nil, ZP);
draw(screen, Rect(p.x, q.y+Dot, p.x+1, g->r.max.y), cols[c][1], nil, ZP);
}else{
draw(screen, Rect(p.x, g->r.min.y, p.x+1, q.y), cols[c][0], nil, paritypt(p.x));
draw(screen, Rect(p.x, q.y, p.x+1, p.y+Dot), cols[c][2], nil, ZP);
draw(screen, Rect(p.x, p.y+Dot, p.x+1, g->r.max.y), cols[c][1], nil, ZP);
}
g->vmax = vmax;
}
void
drawmark(Graph *g, int x)
{
int c;
c = (g->colindex+1)&Ncolor;
draw(screen, Rect(x, g->r.min.y, x+1, g->r.max.y), cols[c][2], nil, ZP);
}
void
redraw(Graph *g, int vmax)
{
int i, c;
c = g->colindex;
draw(screen, g->r, cols[c][0], nil, paritypt(g->r.min.x));
for(i=1; i<Dx(g->r); i++)
drawdatum(g, g->r.max.x-i, g->data[i-1], g->data[i], vmax);
drawdatum(g, g->r.min.x, g->data[i], g->data[i], vmax);
}
void
clearmsg(Graph *g)
{
if(g->overtmp != nil)
draw(screen, g->overtmp->r, g->overtmp, nil, g->overtmp->r.min);
g->overflow = 0;
}
void
drawmsg(Graph *g, char *msg)
{
if(g->overtmp == nil)
return;
/* save previous contents of screen */
draw(g->overtmp, g->overtmp->r, screen, nil, g->overtmp->r.min);
/* draw message */
if(strlen(msg) > g->overtmplen)
msg[g->overtmplen] = 0;
string(screen, g->overtmp->r.min, display->black, ZP, font, msg);
}
void
clearcursor(Graph *g)
{
int x;
long prev;
if(g->overtmp == nil)
return;
if(g->cursor > 0 && g->cursor < g->ndata){
x = g->r.max.x - g->cursor;
prev = 0;
if(g->cursor > 0)
prev = g->data[g->cursor-1];
drawdatum(g, x, prev, g->data[g->cursor], g->vmax);
g->cursor = -1;
}
}
void
drawcursor(Graph *g, int x)
{
if(g->overtmp == nil)
return;
draw(screen, Rect(x, g->r.min.y, x+1, g->r.max.y), cols[g->colindex][2], nil, ZP);
}
void
update1(Graph *g, long v, long vmax, long mark)
{
char buf[Gmsglen];
/* put back screen value sans message */
if(g->overflow || *g->msg){
clearmsg(g);
g->overflow = 0;
}
draw(screen, g->r, screen, nil, Pt(g->r.min.x+1, g->r.min.y));
drawdatum(g, g->r.max.x-1, g->data[0], v, vmax);
if(mark)
drawmark(g, g->r.max.x-1);
memmove(g->data+1, g->data, (g->ndata-1)*sizeof(g->data[0]));
g->data[0] = v;
if(v>vmax){
g->overflow = 1;
sprint(buf, "%ld", v);
drawmsg(g, buf);
} else if(*g->msg)
drawmsg(g, g->msg);
if(g->cursor >= 0){
g->cursor++;
if(g->cursor >= g->ndata){
g->cursor = -1;
if(*g->msg){
clearmsg(g);
*g->msg = 0;
}
}
}
}
void
pinglost(Machine *m, Req*)
{
m->lostmsgs++;
}
void
pingreply(Machine *m, Req *r)
{
ulong x;
x = r->time/1000LL;
m->rttsum += x;
m->rcvdmsgs++;
m->rttmsgs++;
}
void
pingclean(Machine *m, ushort seq, vlong now, int)
{
Req **l, *r;
vlong x, y;
y = 10LL*1000000000LL;
for(l = &m->first; *l; ){
r = *l;
x = now - r->time;
if(x > y || r->seq == seq){
*l = r->next;
r->time = x;
if(r->seq != seq)
pinglost(m, r);
else
pingreply(m, r);
free(r);
} else
l = &(r->next);
}
}
/* IPv4 only */
void
pingsend(Machine *m)
{
int i;
char buf[128], err[ERRMAX];
Icmphdr *ip;
Req *r;
ip = (Icmphdr *)(buf + IPV4HDR_LEN);
memset(buf, 0, sizeof buf);
r = malloc(sizeof *r);
if(r == nil)
return;
for(i = 32; i < MSGLEN; i++)
buf[i] = i;
ip->type = EchoRequest;
ip->code = 0;
ip->seq[0] = m->seq;
ip->seq[1] = m->seq>>8;
r->seq = m->seq;
r->next = nil;
lock(m);
pingclean(m, -1, nsec(), 0);
if(m->first == nil)
m->first = r;
else
m->last->next = r;
m->last = r;
r->time = nsec();
unlock(m);
if(write(m->pingfd, buf, MSGLEN) < MSGLEN){
errstr(err, sizeof err);
if(strstr(err, "unreach")||strstr(err, "exceed"))
m->unreachable++;
}
m->seq++;
}
/* IPv4 only */
void
pingrcv(void *arg)
{
int i, n;
uchar buf[512];
ushort x;
Icmphdr *ip;
Ip4hdr *ip4;
Machine *m = arg;
ip4 = (Ip4hdr *)buf;
ip = (Icmphdr *)(buf + IPV4HDR_LEN);
for(;;){
n = read(m->pingfd, buf, sizeof(buf));
if(n <= 0)
break;
if(n < MSGLEN)
continue;
for(i = 32; i < MSGLEN; i++)
if(buf[i] != (i&0xff))
break;
if(i != MSGLEN)
continue;
x = (ip->seq[1]<<8) | ip->seq[0];
if(ip->type != EchoReply || ip->code != 0)
continue;
lock(m);
pingclean(m, x, nsec(), ip4->ttl);
unlock(m);
}
}
void
initmach(Machine *m, char *name)
{
int cfd = -1;
char *p;
srand(time(0));
p = strchr(name, '!');
if(p){
p++;
m->name = estrdup(p+1);
}else
p = name;
m->name = estrdup(p);
m->nproc = 1;
m->pingfd = dial(netmkaddr(m->name, "icmp", "1"), nil, nil, &cfd);
if(m->pingfd < 0)
sysfatal("dialing %s: %r", m->name);
write(cfd, "ignoreadvice", 12);
close(cfd);
startproc(pingrcv, m);
}
long
rttscale(long x)
{
if(x == 0)
return 0;
x = 10.0*log10(x) - 20.0;
if(x < 0)
x = 0;
return x;
}
double
rttunscale(long x)
{
double dx;
x += 20;
dx = x;
return pow(10.0, dx/10.0);
}
void
rttval(Machine *m, long *v, long *vmax, long *mark)
{
ulong x;
if(m->rttmsgs == 0){
x = m->lastrtt;
} else {
x = m->rttsum/m->rttmsgs;
m->rttsum = m->rttmsgs = 0;
m->lastrtt = x;
}
*v = rttscale(x);
*vmax = Rttmax;
*mark = 0;
}
void
lostval(Machine *m, long *v, long *vmax, long *mark)
{
ulong x;
if(m->rcvdmsgs+m->lostmsgs > 0)
x = (m->lostavg>>1) + (((m->lostmsgs*100)/(m->lostmsgs + m->rcvdmsgs))>>1);
else
x = m->lostavg;
m->lostavg = x;
m->lostmsgs = m->rcvdmsgs = 0;
if(m->unreachable){
m->unreachable = 0;
*mark = 100;
} else
*mark = 0;
*v = x;
*vmax = 100;
}
void
usage(void)
{
fprint(2, "usage: %s machine [machine...]\n", argv0);
exits("usage");
}
void
addgraph(int n)
{
Graph *g, *ograph;
int i, j;
static int nadd;
if(n > nelem(menu2str))
abort();
/* avoid two adjacent graphs of same color */
if(ngraph>0 && graph[ngraph-1].colindex==nadd%Ncolor)
nadd++;
ograph = graph;
graph = emalloc(nmach*(ngraph+1)*sizeof(Graph));
for(i=0; i<nmach; i++)
for(j=0; j<ngraph; j++)
graph[i*(ngraph+1)+j] = ograph[i*ngraph+j];
free(ograph);
ngraph++;
for(i=0; i<nmach; i++){
g = &graph[i*ngraph+(ngraph-1)];
memset(g, 0, sizeof(Graph));
g->label = menu2str[n]+Opwid;
g->newvalue = newvaluefn[n];
g->update = update1; /* no other update functions yet */
g->mach = &mach[i];
g->colindex = nadd%Ncolor;
}
present[n] = 1;
nadd++;
}
int
which2index(int which)
{
int i, n;
n = -1;
for(i=0; i<ngraph; i++){
if(strcmp(menu2str[which]+Opwid, graph[i].label) == 0){
n = i;
break;
}
}
if(n < 0){
fprint(2, "%s: internal error can't drop graph\n", argv0);
killall("error");
}
return n;
}
int
index2which(int index)
{
int i, n;
n = -1;
for(i=0; i<Nmenu2; i++){
if(strcmp(menu2str[i]+Opwid, graph[index].label) == 0){
n = i;
break;
}
}
if(n < 0){
fprint(2, "%s: internal error can't identify graph\n", argv0);
killall("error");
}
return n;
}
void
dropgraph(int which)
{
Graph *ograph;
int i, j, n;
if(which > nelem(menu2str))
abort();
/* convert n to index in graph table */
n = which2index(which);
ograph = graph;
graph = emalloc(nmach*(ngraph-1)*sizeof(Graph));
for(i=0; i<nmach; i++){
for(j=0; j<n; j++)
graph[i*(ngraph-1)+j] = ograph[i*ngraph+j];
free(ograph[i*ngraph+j].data);
freeimage(ograph[i*ngraph+j].overtmp);
for(j++; j<ngraph; j++)
graph[i*(ngraph-1)+j-1] = ograph[i*ngraph+j];
}
free(ograph);
ngraph--;
present[which] = 0;
}
void
addmachine(char *name)
{
if(ngraph > 0){
fprint(2, "%s: internal error: ngraph>0 in addmachine()\n", argv0);
usage();
}
if(nmach == NMACH)
sysfatal("too many machines");
initmach(&mach[nmach++], name);
}
void
resize(void)
{
int i, j, n, startx, starty, x, y, dx, dy, hashdx, ondata;
Graph *g;
Rectangle machr, r;
long v, vmax, mark;
char buf[128];
draw(screen, screen->r, display->white, nil, ZP);
/* label left edge */
x = screen->r.min.x;
y = screen->r.min.y + Labspace+font->height+Labspace;
dy = (screen->r.max.y - y)/ngraph;
dx = Labspace+stringwidth(font, "0")+Labspace;
startx = x+dx+1;
starty = y;
for(i=0; i<ngraph; i++,y+=dy){
draw(screen, Rect(x, y-1, screen->r.max.x, y), display->black, nil, ZP);
draw(screen, Rect(x, y, x+dx, screen->r.max.y), cols[graph[i].colindex][0], nil, paritypt(x));
label(Pt(x, y), dy, graph[i].label);
draw(screen, Rect(x+dx, y, x+dx+1, screen->r.max.y), cols[graph[i].colindex][2], nil, ZP);
}
/* label right edge */
dx = Labspace+stringwidth(font, "0.001")+Labspace;
hashdx = dx;
x = screen->r.max.x - dx;
y = screen->r.min.y + Labspace+font->height+Labspace;
for(i=0; i<ngraph; i++,y+=dy){
draw(screen, Rect(x, y-1, screen->r.max.x, y), display->black, nil, ZP);
draw(screen, Rect(x, y, x+dx, screen->r.max.y), cols[graph[i].colindex][0], nil, paritypt(x));
hashmarks(Pt(x, y), dy, i);
draw(screen, Rect(x+dx, y, x+dx+1, screen->r.max.y), cols[graph[i].colindex][2], nil, ZP);
}
/* label top edge */
dx = (screen->r.max.x - dx - startx)/nmach;
for(x=startx, i=0; i<nmach; i++,x+=dx){
draw(screen, Rect(x-1, starty-1, x, screen->r.max.y), display->black, nil, ZP);
j = dx/stringwidth(font, "0");
n = mach[i].nproc;
if(n>1 && j>=1+3+(n>10)+(n>100)){ /* first char of name + (n) */
j -= 3+(n>10)+(n>100);
if(j <= 0)
j = 1;
snprint(buf, sizeof buf, "%.*s(%d)", j, mach[i].name, n);
}else
snprint(buf, sizeof buf, "%.*s", j, mach[i].name);
string(screen, Pt(x+Labspace, screen->r.min.y + Labspace), display->black, ZP,
font, buf);
}
/* draw last vertical line */
draw(screen,
Rect(screen->r.max.x-hashdx-1, starty-1, screen->r.max.x-hashdx, screen->r.max.y),
display->black, nil, ZP);
/* create graphs */
for(i=0; i<nmach; i++){
machr = Rect(startx+i*dx, starty, screen->r.max.x, screen->r.max.y);
if(i < nmach-1)
machr.max.x = startx+(i+1)*dx - 1;
else
machr.max.x = screen->r.max.x - hashdx - 1;
y = starty;
for(j=0; j<ngraph; j++, y+=dy){
g = &graph[i*ngraph+j];
/* allocate data */
ondata = g->ndata;
g->ndata = Dx(machr)+1; /* may be too many if label will be drawn here; so what? */
g->data = erealloc(g->data, g->ndata*sizeof(long));
if(g->ndata > ondata)
memset(g->data+ondata, 0, (g->ndata-ondata)*sizeof(long));
/* set geometry */
g->r = machr;
g->r.min.y = y;
g->r.max.y = y+dy - 1;
if(j == ngraph-1)
g->r.max.y = screen->r.max.y;
draw(screen, g->r, cols[g->colindex][0], nil, paritypt(g->r.min.x));
g->overflow = 0;
*g->msg = 0;
freeimage(g->overtmp);
g->overtmp = nil;
g->overtmplen = 0;
r = g->r;
r.max.y = r.min.y+font->height;
n = (g->r.max.x - r.min.x)/stringwidth(font, "9");
if(n > 4){
if(n > Gmsglen)
n = Gmsglen;
r.max.x = r.min.x+stringwidth(font, "9")*n;
g->overtmplen = n;
g->overtmp = allocimage(display, r, screen->chan, 0, -1);
}
g->newvalue(g->mach, &v, &vmax, &mark);
redraw(g, vmax);
}
}
flushimage(display, 1);
}
void
eresized(int new)
{
lockdisplay(display);
if(new && getwindow(display, Refnone) < 0) {
fprint(2, "%s: can't reattach to window\n", argv0);
killall("reattach");
}
resize();
unlockdisplay(display);
}
void
dobutton2(Mouse *m)
{
int i;
for(i=0; i<Nmenu2; i++)
if(present[i])
memmove(menu2str[i], "drop ", Opwid);
else
memmove(menu2str[i], "add ", Opwid);
i = emenuhit(3, m, &menu2);
if(i >= 0){
if(!present[i])
addgraph(i);
else if(ngraph > 1)
dropgraph(i);
resize();
}
}
void
dobutton1(Mouse *m)
{
int i, n, dx, dt;
Graph *g;
char *e;
double f;
for(i = 0; i < ngraph*nmach; i++){
if(ptinrect(m->xy, graph[i].r))
break;
}
if(i == ngraph*nmach)
return;
g = &graph[i];
if(g->overtmp == nil)
return;
/* clear any previous message and cursor */
if(g->overflow || *g->msg){
clearmsg(g);
*g->msg = 0;
clearcursor(g);
}
dx = g->r.max.x - m->xy.x;
g->cursor = dx;
dt = dx*pinginterval;
e = &g->msg[sizeof(g->msg)];
seprint(g->msg, e, "%s", ctime(starttime-dt/1000)+11);
g->msg[8] = 0;
n = 8;
switch(index2which(i)){
case Mrtt:
f = rttunscale(g->data[dx]);
seprint(g->msg+n, e, " %3.3g", f/1000000);
break;
case Mlost:
seprint(g->msg+n, e, " %ld%%", g->data[dx]);
break;
}
drawmsg(g, g->msg);
drawcursor(g, m->xy.x);
}
void
mouseproc(void*)
{
Mouse mouse;
for(;;){
mouse = emouse();
if(mouse.buttons == 4){
lockdisplay(display);
dobutton2(&mouse);
unlockdisplay(display);
} else if(mouse.buttons == 1){
lockdisplay(display);
dobutton1(&mouse);
unlockdisplay(display);
}
}
}
void
startproc(void (*f)(void*), void *arg)
{
int pid;
switch(pid = rfork(RFPROC|RFMEM|RFNOWAIT)){
case -1:
fprint(2, "%s: fork failed: %r\n", argv0);
killall("fork failed");
case 0:
f(arg);
killall("process died");
exits(nil);
}
pids[npid++] = pid;
}
void
main(int argc, char *argv[])
{
int i, j;
long v, vmax, mark;
char flags[10], *f, *p;
fmtinstall('V', eipfmt);
f = flags;
pinginterval = 5000; /* 5 seconds */
ARGBEGIN{
case 'i':
p = ARGF();
if(p == nil)
usage();
pinginterval = atoi(p);
break;
default:
if(f - flags >= sizeof(flags)-1)
usage();
*f++ = ARGC();
break;
}ARGEND
*f = 0;
pids[npid++] = getpid();
for(i=0; i<argc; i++)
addmachine(argv[i]);
for(f = flags; *f; f++)
switch(*f){
case 'l':
addgraph(Mlost);
break;
case 'r':
addgraph(Mrtt);
break;
}
if(nmach == 0)
usage();
if(ngraph == 0)
addgraph(Mrtt);
for(i=0; i<nmach; i++)
for(j=0; j<ngraph; j++)
graph[i*ngraph+j].mach = &mach[i];
if(initdraw(nil, nil, argv0) < 0){
fprint(2, "%s: initdraw failed: %r\n", argv0);
exits("initdraw");
}
display->locking = 1; /* tell library we're using the display lock */
colinit();
einit(Emouse);
startproc(mouseproc, 0);
resize();
starttime = time(0);
unlockdisplay(display); /* display is still locked from initdraw() */
for(j = 0; ; j++){
lockdisplay(display);
if(j == nmach){
parity = 1-parity;
j = 0;
for(i=0; i<nmach*ngraph; i++){
graph[i].newvalue(graph[i].mach, &v, &vmax, &mark);
graph[i].update(&graph[i], v, vmax, mark);
}
starttime = time(0);
}
flushimage(display, 1);
unlockdisplay(display);
pingsend(&mach[j%nmach]);
sleep(pinginterval/nmach);
}
}