[9fans] stats.c modification

[9fans] stats.c modification

[andrey mirtchovski]

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Hi,

Attached in this mail is a modified version of stats.c that includes
an option for increasing the interval between updates. The new
option is invoked with:

	stats -T timestep

where timestep is in seconds (later gets transfered to milliseconds).
If the option is omitted stats behaviour is unchanged -- the default
update interval is one second. An increased timestep causes the
scale for almost all measurements to be increased proportionally
(for example, if the max number of ethernet packets was 1000 for
1-second updates, it will be 2000 for 2-second updates and 10000
for 10-second updates). Unafected are the scales for memory usage
and system load.

I find this useful for monitoring cpu servers over a long period
of time -- I use it with a timestep of 60 seconds to monitor cpu
server activity overnight...

If you think that's a valuable modification I can write the 2-line
paragraph to add to the man pages :)

andrey

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#include <u.h>
#include <libc.h>
#include <ctype.h>
#include <auth.h>
#include <fcall.h>
#include <draw.h>
#include <event.h>

#define	MAXNUM	8	/* maximum number of numbers on data line */

typedef struct Graph		Graph;
typedef struct Machine	Machine;

struct Graph
{
	int		colindex;
	Rectangle	r;
	int		*data;
	int		ndata;
	char		*label;
	void		(*newvalue)(Machine*, long*, long*, int);
	void		(*update)(Graph*, long, long);
	Machine	*mach;
	int		overflow;
	Image	*overtmp;
};

enum
{
	/* /dev/swap */
	Mem		= 0,
	Maxmem,
	Swap,
	Maxswap,
	/* /dev/sysstats */
	Procno	= 0,
	Context,
	Interrupt,
	Syscall,
	Fault,
	TLBfault,
	TLBpurge,
	Load,
	/* /net/ether0/0/stats */
	In		= 0,
	Out,
	Err0,
};

struct Machine
{
	char		*name;
	int		remote;
	int		statsfd;
	int		swapfd;
	int		etherfd;
	int		ifstatsfd;
	int		batteryfd;
	int		bitsybatfd;
	int		disable;

	long		devswap[4];
	long		devsysstat[8];
	long		prevsysstat[8];
	int		nproc;
	long		netetherstats[8];
	long		prevetherstats[8];
	long		batterystats[2];
	long		netetherifstats[2];

	char		buf[1024];
	char		*bufp;
	char		*ebufp;
};

enum
{
	Mainproc,
	Mouseproc,
	NPROC,
};

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 ") */
	Nlab		= 3,	/* max number of labels on y axis */
	Lablen	= 16,	/* max length of label */
	Lx		= 4,	/* label tick length */
};

enum Menu2
{
	Mcontext,
	Mether,
	Methererr,
	Metherin,
	Metherout,
	Mfault,
	Mintr,
	Mload,
	Mmem,
	Mswap,
	Msyscall,
	Mtlbmiss,
	Mtlbpurge,
	Mbattery,
	Msignal,
	Nmenu2,
};

char	*menu2str[Nmenu2+1] = {
	"add  context ",
	"add  ether   ",
	"add  ethererr",
	"add  etherin ",
	"add  etherout",
	"add  fault   ",
	"add  intr    ",
	"add  load    ",
	"add  mem     ",
	"add  swap    ",
	"add  syscall ",
	"add  tlbmiss ",
	"add  tlbpurge",
	"add  battery ",
	"add  802.11b ",
	nil,
};


void	contextval(Machine*, long*, long*, int),
	etherval(Machine*, long*, long*, int),
	ethererrval(Machine*, long*, long*, int),
	etherinval(Machine*, long*, long*, int),
	etheroutval(Machine*, long*, long*, int),
	faultval(Machine*, long*, long*, int),
	intrval(Machine*, long*, long*, int),
	loadval(Machine*, long*, long*, int),
	memval(Machine*, long*, long*, int),
	swapval(Machine*, long*, long*, int),
	syscallval(Machine*, long*, long*, int),
	tlbmissval(Machine*, long*, long*, int),
	tlbpurgeval(Machine*, long*, long*, int),
	batteryval(Machine*, long*, long*, int),
	signalval(Machine*, long*, long*, int);

Menu	menu2 = {menu2str, nil};
int		present[Nmenu2];
void		(*newvaluefn[Nmenu2])(Machine*, long*, long*, int init) = {
	contextval,
	etherval,
	ethererrval,
	etherinval,
	etheroutval,
	faultval,
	intrval,
	loadval,
	memval,
	swapval,
	syscallval,
	tlbmissval,
	tlbpurgeval,
	batteryval,
	signalval,
};

Image	*cols[Ncolor][3];
Graph	*graph;
Machine	*mach;
Font		*mediumfont;
char		*mysysname;
char		argchars[] = "8bceEfimlnpstw";
int		pids[NPROC];
int 		parity;	/* toggled to avoid patterns in textured background */
int		nmach;
int		ngraph;	/* totaly number is ngraph*nmach */
double	scale = 1.0;
int		logscale = 0;
int		ylabels = 0;
int		oldsystem = 0;
int 		timestep = 1000; /* in milliseconds */

char		*procnames[NPROC] = {"main", "mouse"};

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, "stats: out of memory allocating %ld: %r\n", sz);
		killall("mem");
	}
	memset(v, 0, sz);
	return v;
}

void*
erealloc(void *v, ulong sz)
{
	v = realloc(v, sz);
	if(v == nil) {
		fprint(2, "stats: out of memory reallocating %ld: %r\n", sz);
		killall("mem");
	}
	return v;
}

char*
estrdup(char *s)
{
	char *t;
	if((t = strdup(s)) == nil) {
		fprint(2, "stats: out of memory in strdup(%.10s): %r\n", 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)
{
	mediumfont = openfont(display, "/lib/font/bit/pelm/latin1.8.font");
	if(mediumfont == nil)
		mediumfont = font;

	/* 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);
}

int
loadbuf(Machine *m, int *fd)
{
	int n;


	if(*fd < 0)
		return 0;
	seek(*fd, 0, 0);
	n = read(*fd, m->buf, sizeof m->buf);
	if(n <= 0){
		close(*fd);
		*fd = -1;
		return 0;
	}
	m->bufp = m->buf;
	m->ebufp = m->buf+n;
	return 1;
}

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+mediumfont->height-Ysqueeze > maxy)
			break;
		w = chartorune(r, s);
		s += w;
		w = runestringwidth(mediumfont, r);
		if(w > maxw)
			maxw = w;
		runestring(screen, p, display->black, ZP, mediumfont, r);
		p.y += mediumfont->height-Ysqueeze;
	}
}

Point
paritypt(int x)
{
	return Pt(x+parity, 0);
}

Point
datapoint(Graph *g, int x, long v, long vmax)
{
	Point p;
	double y;

	p.x = x;
	y = ((double)v)/(vmax*scale);
	if(logscale){
		/*
		 * Arrange scale to cover a factor of 'timestep'.
		 * vmax corresponds to the 100 mark.
		 * 10*vmax is the top of the scale.
		 */
		if(y <= 0.)
			y = 0;
		else{
			y = log10(y);
			/* 1 now corresponds to the top; -2 to the bottom; rescale */
			y = (y+2.)/3.;
		}
	}
	p.y = g->r.max.y - Dy(g->r)*y - 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);
	}

}

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);
	g->overflow = 0;
}

void
update1(Graph *g, long v, long vmax)
{
	char buf[32];
	int overflow;

	if(g->overflow && g->overtmp!=nil)
		draw(screen, g->overtmp->r, g->overtmp, nil, g->overtmp->r.min);
	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);
	memmove(g->data+1, g->data, (g->ndata-1)*sizeof(g->data[0]));
	g->data[0] = v;
	g->overflow = 0;
	if(logscale)
		overflow = (v>10*vmax*scale);
	else
		overflow = (v>vmax*scale);
	if(overflow && g->overtmp!=nil){
		g->overflow = 1;
		draw(g->overtmp, g->overtmp->r, screen, nil, g->overtmp->r.min);
		sprint(buf, "%ld", v);
		string(screen, g->overtmp->r.min, display->black, ZP, mediumfont, buf);
	}
}

/* read one line of text from buffer and process integers */
int
readnums(Machine *m, int n, long *a, int spanlines)
{
	int i;
	char *p, *ep;

	if(spanlines)
		ep = m->ebufp;
	else
		for(ep=m->bufp; ep<m->ebufp; ep++)
			if(*ep == '\n')
				break;
	p = m->bufp;
	for(i=0; i<n && p<ep; i++){
		while(p<ep && !isdigit(*p) && *p!='-')
			p++;
		if(p == ep)
			break;
		a[i] = strtol(p, &p, 10);
	}
	if(ep < m->ebufp)
		ep++;
	m->bufp = ep;
	return i == n;
}

/* Network on fd1, mount driver on fd0 */
static int
filter(int fd)
{
	int p[2];

	if(pipe(p) < 0){
		fprint(2, "stats: can't pipe: %r\n");
		killall("pipe");
	}

	switch(rfork(RFNOWAIT|RFPROC|RFFDG)) {
	case -1:
		sysfatal("rfork record module");
	case 0:
		dup(fd, 1);
		close(fd);
		dup(p[0], 0);
		close(p[0]);
		close(p[1]);
		execl("/bin/aux/fcall", "fcall", 0);
		fprint(2, "stats: can't exec fcall: %r\n");
		killall("fcall");
	default:
		close(fd);
		close(p[0]);
	}
	return p[1];	
}

/*
 * 9fs
 */
int
connect9fs(char *addr)
{
	char dir[256], *na;
	int fd;

	fprint(2, "connect9fs...");
	na = netmkaddr(addr, 0, "9fs");

	fprint(2, "dial %s...", na);
	if((fd = dial(na, 0, dir, 0)) < 0)
		return -1;

	fprint(2, "dir %s...", dir);
//	if(strstr(dir, "tcp"))
//		fd = filter(fd);
	return fd;
}

int
old9p(int fd)
{
	int p[2];

	if(pipe(p) < 0)
		return -1;

	switch(rfork(RFPROC|RFFDG|RFNAMEG)) {
	case -1:
		return -1;
	case 0:
		if(fd != 1){
			dup(fd, 1);
			close(fd);
		}
		if(p[0] != 0){
			dup(p[0], 0);
			close(p[0]);
		}
		close(p[1]);
		if(0){
			fd = open("/sys/log/cpu", OWRITE);
			if(fd != 2){
				dup(fd, 2);
				close(fd);
			}
			execl("/bin/srvold9p", "srvold9p", "-ds", 0);
		} else
			execl("/bin/srvold9p", "srvold9p", "-s", 0);
		return -1;
	default:
		close(fd);
		close(p[0]);
	}
	return p[1];	
}


/*
 * exportfs
 */
int 
connectexportfs(char *addr)
{
	char buf[ERRMAX], dir[256], *na;
	int fd, n;
	char *tree;
	AuthInfo *ai;

	tree = "/";
	na = netmkaddr(addr, 0, "exportfs");
	if((fd = dial(na, 0, dir, 0)) < 0)
		return -1;

	ai = auth_proxy(fd, auth_getkey, "proto=p9any role=client");
	if(ai == nil)
		return -1;

	n = write(fd, tree, strlen(tree));
	if(n < 0){
		close(fd);
		return -1;
	}

	strcpy(buf, "can't read tree");
	n = read(fd, buf, sizeof buf - 1);
	if(n!=2 || buf[0]!='O' || buf[1]!='K'){
		buf[sizeof buf - 1] = '\0';
		werrstr("bad remote tree: %s\n", buf);
		close(fd);
		return -1;
	}

//	if(strstr(dir, "tcp"))
//		fd = filter(fd);

	if(oldsystem)
		return old9p(fd);

	return fd;
}

void
initmach(Machine *m, char *name)
{
	int n, fd;
	long a[MAXNUM];
	char *p, mpt[256], buf[256];

	p = strchr(name, '!');
	if(p){
		p++;
		m->name = estrdup(p+1);
	}else
		p = name;
	m->name = estrdup(p);
	m->remote = (strcmp(p, mysysname) != 0);
	if(m->remote == 0)
		strcpy(mpt, "");
	else{
		snprint(mpt, sizeof mpt, "/n/%s", p);
		fd = connectexportfs(name);
		if(fd < 0){
			fprint(2, "can't connect to %s: %r\n", name);
			killall("connect");
		}
		/* BUG? need to use amount() now? */
		if(mount(fd, -1, mpt, MREPL, "") < 0){
			fprint(2, "stats: mount %s on %s failed (%r); trying /n/sid\n", name, mpt);
			strcpy(mpt, "/n/sid");
			if(mount(fd, -1, mpt, MREPL, "") < 0){
				fprint(2, "stats: mount %s on %s failed: %r\n", name, mpt);
				killall("mount");
			}
		}
	}

	snprint(buf, sizeof buf, "%s/dev/swap", mpt);
	m->swapfd = open(buf, OREAD);
	if(loadbuf(m, &m->swapfd) && readnums(m, nelem(m->devswap), a, 0))
		memmove(m->devswap, a, sizeof m->devswap);
	else
		m->devswap[Maxmem] = m->devswap[Maxswap] = 100;

	snprint(buf, sizeof buf, "%s/dev/sysstat", mpt);
	m->statsfd = open(buf, OREAD);
	if(loadbuf(m, &m->statsfd)){
		for(n=0; readnums(m, nelem(m->devsysstat), a, 0); n++)
			;
		m->nproc = n;
	}else
		m->nproc = 1;

	snprint(buf, sizeof buf, "%s/net/ether0/0/stats", mpt);
	m->etherfd = open(buf, OREAD);
	if(loadbuf(m, &m->etherfd) && readnums(m, nelem(m->netetherstats), a, 1))
		memmove(m->netetherstats, a, sizeof m->netetherstats);

	snprint(buf, sizeof buf, "%s/net/ether0/0/ifstats", mpt);
	m->ifstatsfd = open(buf, OREAD);
	if(loadbuf(m, &m->ifstatsfd)){
		/* need to check that this is a wavelan interface */
		if(strncmp(m->buf, "Signal: ", 8) == 0 && readnums(m, nelem(m->netetherifstats), a, 1))
			memmove(m->netetherifstats, a, sizeof m->netetherifstats);
	}

	snprint(buf, sizeof buf, "%s/mnt/apm/battery", mpt);
	m->batteryfd = open(buf, OREAD);
	m->bitsybatfd = -1;
	if(m->batteryfd >= 0){
		if(loadbuf(m, &m->batteryfd) && readnums(m, nelem(m->batterystats), a, 0))
			memmove(m->batterystats, a, sizeof(m->batterystats));
	}else{
		snprint(buf, sizeof buf, "%s/dev/battery", mpt);
		m->bitsybatfd = open(buf, OREAD);
		if(loadbuf(m, &m->bitsybatfd) && readnums(m, 1, a, 0))
			memmove(m->batterystats, a, sizeof(m->batterystats));
	}
}

jmp_buf catchalarm;

void
alarmed(void *a, char *s)
{
	if(strcmp(s, "alarm") == 0)
		notejmp(a, catchalarm, 1);
	noted(NDFLT);
}

int
needswap(int init)
{
	return init | present[Mmem] | present[Mswap];
}


int
needstat(int init)
{
	return init | present[Mcontext]  | present[Mfault] | present[Mintr] | present[Mload] |
		present[Msyscall] | present[Mtlbmiss] | present[Mtlbpurge];
}


int
needether(int init)
{
	return init | present[Mether] | present[Metherin] | present[Metherout] | present[Methererr];
}

int
needbattery(int init)
{
	return init | present[Mbattery];
}

int
needsignal(int init)
{
	return init | present[Msignal];
}

void
readmach(Machine *m, int init)
{
	int n, i;
	long a[8];
	char buf[32];

	if(m->remote && (m->disable || setjmp(catchalarm))){
		if(m->disable == 0){
			snprint(buf, sizeof buf, "%s(dead)", m->name);
			m->name = estrdup(buf);
			if(display != nil)	/* else we're still initializing */
				eresized(0);
		}
		m->disable = 1;
		memmove(m->devsysstat, m->prevsysstat, sizeof m->devsysstat);
		memmove(m->netetherstats, m->prevetherstats, sizeof m->netetherstats);
		return;
	}
	if(m->remote){
		notify(alarmed);
		alarm(5000);
	}
	if(needswap(init) && loadbuf(m, &m->swapfd) && readnums(m, nelem(m->devswap), a, 0))
		memmove(m->devswap, a, sizeof m->devswap);
	if(needstat(init) && loadbuf(m, &m->statsfd)){
		memmove(m->prevsysstat, m->devsysstat, sizeof m->devsysstat);
		memset(m->devsysstat, 0, sizeof m->devsysstat);
		for(n=0; n<m->nproc && readnums(m, nelem(m->devsysstat), a, 0); n++)
			for(i=0; i<nelem(m->devsysstat); i++)
				m->devsysstat[i] += a[i];
	}
	if(needether(init) && loadbuf(m, &m->etherfd) && readnums(m, nelem(m->netetherstats), a, 1)){
		memmove(m->prevetherstats, m->netetherstats, sizeof m->netetherstats);
		memmove(m->netetherstats, a, sizeof m->netetherstats);
	}
	if(needsignal(init) && loadbuf(m, &m->ifstatsfd) && strncmp(m->buf, "Signal: ", 8)==0 && readnums(m, nelem(m->netetherifstats), a, 1)){
		memmove(m->netetherifstats, a, sizeof m->netetherifstats);
	}
	if(needbattery(init) && loadbuf(m, &m->batteryfd) && readnums(m, nelem(m->batterystats), a, 0))
		memmove(m->batterystats, a, sizeof(m->batterystats));
	if(needbattery(init) && loadbuf(m, &m->bitsybatfd) && readnums(m, 1, a, 0))
		memmove(m->batterystats, a, sizeof(m->batterystats));

	if(m->remote){
		alarm(0);
		notify(nil);
	}
}

void
memval(Machine *m, long *v, long *vmax, int)
{
	*v = m->devswap[Mem];
	*vmax = m->devswap[Maxmem];
}

void
swapval(Machine *m, long *v, long *vmax, int)
{
	*v = m->devswap[Swap];
	*vmax = m->devswap[Maxswap];
}

void
contextval(Machine *m, long *v, long *vmax, int init)
{
	*v = m->devsysstat[Context]-m->prevsysstat[Context];
	*vmax = timestep*m->nproc;
	if(init)
		*vmax = timestep;
}

void
intrval(Machine *m, long *v, long *vmax, int init)
{
	*v = m->devsysstat[Interrupt]-m->prevsysstat[Interrupt];
	*vmax = timestep*m->nproc;
	if(init)
		*vmax = timestep;
}

void
syscallval(Machine *m, long *v, long *vmax, int init)
{
	*v = m->devsysstat[Syscall]-m->prevsysstat[Syscall];
	*vmax = timestep*m->nproc;
	if(init)
		*vmax = timestep;
}

void
faultval(Machine *m, long *v, long *vmax, int init)
{
	*v = m->devsysstat[Fault]-m->prevsysstat[Fault];
	*vmax = timestep*m->nproc;
	if(init)
		*vmax = timestep;
}

void
tlbmissval(Machine *m, long *v, long *vmax, int init)
{
	*v = m->devsysstat[TLBfault]-m->prevsysstat[TLBfault];
	*vmax = 10*m->nproc;
	if(init)
		*vmax = 10;
}

void
tlbpurgeval(Machine *m, long *v, long *vmax, int init)
{
	*v = m->devsysstat[TLBpurge]-m->prevsysstat[TLBpurge];
	*vmax = 10*m->nproc;
	if(init)
		*vmax = 10;
}

void
loadval(Machine *m, long *v, long *vmax, int init)
{
	*v = m->devsysstat[Load];
	*vmax = 1000*m->nproc;
	if(init)
		*vmax = 1000;
}

void
etherval(Machine *m, long *v, long *vmax, int init)
{
	*v = m->netetherstats[In]-m->prevetherstats[In] + m->netetherstats[Out]-m->prevetherstats[Out];
	*vmax = timestep*m->nproc;
	if(init)
		*vmax = timestep;
}

void
etherinval(Machine *m, long *v, long *vmax, int init)
{
	*v = m->netetherstats[In]-m->prevetherstats[In];
	*vmax = timestep*m->nproc;
	if(init)
		*vmax = timestep;
}

void
etheroutval(Machine *m, long *v, long *vmax, int init)
{
	*v = m->netetherstats[Out]-m->prevetherstats[Out];
	*vmax = timestep*m->nproc;
	if(init)
		*vmax = timestep;
}

void
ethererrval(Machine *m, long *v, long *vmax, int init)
{
	int i;

	*v = 0;
	for(i=Err0; i<nelem(m->netetherstats); i++)
		*v += m->netetherstats[i];
	*vmax = 10*m->nproc;
	if(init)
		*vmax = 10;
}

void
batteryval(Machine *m, long *v, long *vmax, int)
{
	*v = m->batterystats[0];
	if(m->bitsybatfd >= 0)
		*vmax = 184;		// at least on my bitsy...
	else
		*vmax = 100;
}

void
signalval(Machine *m, long *v, long *vmax, int)
{
	long l;

	*vmax = timestep;
	l = m->netetherifstats[0];
	/*
	 * Range is seen to be from about -45 (strong) to -95 (weak); rescale
	 */
	if(l == 0){	/* probably not present */
		*v = 0;
		return;
	}
	*v = 20*(l+95);
}

void
usage(void)
{
	fprint(2, "usage: stats [-O] [-S scale] [-T timestep] [-LY] [-%s] [machine...]\n", argchars);
	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++;
}

void
dropgraph(int which)
{
	Graph *ograph;
	int i, j, n;

	if(which > nelem(menu2str))
		abort();
	/* convert n to index in graph table */
	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, "stats: internal error can't drop graph\n");
		killall("error");
	}
	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, "stats: internal error: ngraph>0 in addmachine()\n");
		usage();
	}
	if(mach == nil)
		nmach = 0;	/* a little dance to get us started with local machine by default */
	mach = erealloc(mach, (nmach+1)*sizeof(Machine));
	memset(mach+nmach, 0, sizeof(Machine));
	initmach(mach+nmach, name);
	nmach++;
}

void
labelstrs(Graph *g, char strs[Nlab][Lablen], int *np)
{
	int j;
	long v, vmax;

	g->newvalue(g->mach, &v, &vmax, 1);
	if(logscale){
		for(j=1; j<=2; j++)
			sprint(strs[j-1], "%g", scale*pow(10., j)*(double)vmax/100.);
		*np = 2;
	}else{
		for(j=1; j<=3; j++)
			sprint(strs[j-1], "%g", scale*(double)j*(double)vmax/4.0);
		*np = 3;
	}
}

int
labelwidth(void)
{
	int i, j, n, w, maxw;
	char strs[Nlab][Lablen];

	maxw = 0;
	for(i=0; i<ngraph; i++){
		/* choose value for rightmost graph */
		labelstrs(&graph[ngraph*(nmach-1)+i], strs, &n);
		for(j=0; j<n; j++){
			w = stringwidth(mediumfont, strs[j]);
			if(w > maxw)
				maxw = w;
		}
	}
	return maxw;
}

void
resize(void)
{
	int i, j, k, n, startx, starty, x, y, dx, dy, ly, ondata, maxx, wid, nlab;
	Graph *g;
	Rectangle machr, r;
	long v, vmax;
	char buf[128], labs[Nlab][Lablen];

	draw(screen, screen->r, display->white, nil, ZP);

	/* label left edge */
	x = screen->r.min.x;
	y = screen->r.min.y + Labspace+mediumfont->height+Labspace;
	dy = (screen->r.max.y - y)/ngraph;
	dx = Labspace+stringwidth(mediumfont, "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 top edge */
	dx = (screen->r.max.x - 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(mediumfont, "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, mediumfont, buf);
	}

	maxx = screen->r.max.x;

	/* label right, if requested */
	if(ylabels && dy>Nlab*(mediumfont->height+1)){
		wid = labelwidth();
		if(wid < (maxx-startx)-30){
			/* else there's not enough room */
			maxx -= 1+Lx+wid;
			draw(screen, Rect(maxx, starty, maxx+1, screen->r.max.y), display->black, nil, ZP);
			y = starty;
			for(j=0; j<ngraph; j++, y+=dy){
				/* choose value for rightmost graph */
				g = &graph[ngraph*(nmach-1)+j];
				labelstrs(g, labs, &nlab);
				r = Rect(maxx+1, y, screen->r.max.x, y+dy-1);
				if(j == ngraph-1)
					r.max.y = screen->r.max.y;
				draw(screen, r, cols[g->colindex][0], nil, paritypt(r.min.x));
				for(k=0; k<nlab; k++){
					ly = y + (dy*(nlab-k)/(nlab+1));
					draw(screen, Rect(maxx+1, ly, maxx+1+Lx, ly+1), display->black, nil, ZP);
					ly -= mediumfont->height/2;
					string(screen, Pt(maxx+1+Lx, ly), display->black, ZP, mediumfont, labs[k]);
				}
			}
		}
	}

	/* create graphs */
	for(i=0; i<nmach; i++){
		machr = Rect(startx+i*dx, starty, maxx, screen->r.max.y);
		if(i < nmach-1)
			machr.max.x = startx+(i+1)*dx - 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;
			r = g->r;
			r.max.y = r.min.y+mediumfont->height;
			r.max.x = r.min.x+stringwidth(mediumfont, "9999999");
			freeimage(g->overtmp);
			g->overtmp = nil;
			if(r.max.x <= g->r.max.x)
				g->overtmp = allocimage(display, r, screen->chan, 0, -1);
			g->newvalue(g->mach, &v, &vmax, 0);
			redraw(g, vmax);
		}
	}

	flushimage(display, 1);
}

void
eresized(int new)
{
	lockdisplay(display);
	if(new && getwindow(display, Refnone) < 0) {
		fprint(2, "stats: can't reattach to window\n");
		killall("reattach");
	}
	resize();
	unlockdisplay(display);
}

void
mouseproc(void)
{
	Mouse mouse;
	int i;

	for(;;){
		mouse = emouse();
		if(mouse.buttons == 4){
			lockdisplay(display);
			for(i=0; i<Nmenu2; i++)
				if(present[i])
					memmove(menu2str[i], "drop ", Opwid);
				else
					memmove(menu2str[i], "add  ", Opwid);
			i = emenuhit(3, &mouse, &menu2);
			if(i >= 0){
				if(!present[i])
					addgraph(i);
				else if(ngraph > 1)
					dropgraph(i);
				resize();
			}
			unlockdisplay(display);
		}
	}
}

void
startproc(void (*f)(void), int index)
{
	int pid;

	switch(pid = rfork(RFPROC|RFMEM|RFNOWAIT)){
	case -1:
		fprint(2, "stats: fork failed: %r\n");
		killall("fork failed");
	case 0:
		f();
		fprint(2, "stats: %s process exits\n", procnames[index]);
		if(index >= 0)
			killall("process died");
		exits(nil);
	}
	if(index >= 0)
		pids[index] = pid;
}

void
main(int argc, char *argv[])
{
	int i, j;
	char *s;
	long v, vmax, nargs;
	char args[100];

	nmach = 1;
	mysysname = getenv("sysname");
	if(mysysname == nil){
		fprint(2, "stats: can't find $sysname: %r\n");
		exits("sysname");
	}
	mysysname = estrdup(mysysname);

	nargs = 0;
	ARGBEGIN{
	case 'S':
		s = ARGF();
		if(s == nil)
			usage();
		scale = atof(s);
		if(scale <= 0.)
			usage();
		break;
	case 'L':
		logscale++;
		break;
	case 'Y':
		ylabels++;
		break;
	case 'O':
		oldsystem = 1;
		break;
	case 'T':
		s = ARGF();
		if(s == nil)
			usage();
		timestep = atof(s);
		if(timestep <= 0)
			usage();
		timestep *= 1000; /* sleep wants miliseconds */
		break;
	default:
		if(nargs>=sizeof args || strchr(argchars, ARGC())==nil)
			usage();
		args[nargs++] = ARGC();
	}ARGEND

	if(argc == 0){
		mach = emalloc(nmach*sizeof(Machine));
		initmach(&mach[0], mysysname);
		readmach(&mach[0], 1);
	}else{
		for(i=0; i<argc; i++){
			addmachine(argv[i]);
			readmach(&mach[i], 1);
		}
	}

	for(i=0; i<nargs; i++)
	switch(args[i]){
	default:
		fprint(2, "stats: internal error: unknown arg %c\n", args[i]);
		usage();
	case 'b':
		addgraph(Mbattery);
		break;
	case 'c':
		addgraph(Mcontext);
		break;
	case 'e':
		addgraph(Mether);
		break;
	case 'E':
		addgraph(Metherin);
		addgraph(Metherout);
		break;
	case 'f':
		addgraph(Mfault);
		break;
	case 'i':
		addgraph(Mintr);
		break;
	case 'l':
		addgraph(Mload);
		break;
	case 'm':
		addgraph(Mmem);
		break;
	case 'n':
		addgraph(Metherin);
		addgraph(Metherout);
		addgraph(Methererr);
		break;
	case 'p':
		addgraph(Mtlbpurge);
		break;
	case 's':
		addgraph(Msyscall);
		break;
	case 't':
		addgraph(Mtlbmiss);
		addgraph(Mtlbpurge);
		break;
	case '8':
		addgraph(Msignal);
		break;
	case 'w':
		addgraph(Mswap);
		break;
	}

	if(ngraph == 0)
		addgraph(Mload);

	for(i=0; i<nmach; i++)
		for(j=0; j<ngraph; j++)
			graph[i*ngraph+j].mach = &mach[i];

	if(initdraw(nil, nil, "stats") < 0){
		fprint(2, "stats: initdraw failed: %r\n");
		exits("initdraw");
	}
	colinit();
	einit(Emouse);
	notify(nil);
	startproc(mouseproc, Mouseproc);
	pids[Mainproc] = getpid();
	display->locking = 1;	/* tell library we're using the display lock */

	resize();

	unlockdisplay(display); /* display is still locked from initdraw() */
	for(;;){
		for(i=0; i<nmach; i++)
			readmach(&mach[i], 0);
		lockdisplay(display);
		parity = 1-parity;
		for(i=0; i<nmach*ngraph; i++){
			graph[i].newvalue(graph[i].mach, &v, &vmax, 0);
			graph[i].update(&graph[i], v, vmax);
		}
		flushimage(display, 1);
		unlockdisplay(display);
		sleep(timestep);
	}
}