1/*	$NetBSD: main.c,v 1.56 2021/08/21 13:22:19 christos Exp $	*/
2
3/*-
4 * Copyright (c) 1980, 1992, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#include <sys/cdefs.h>
33#ifndef lint
34__COPYRIGHT("@(#) Copyright (c) 1980, 1992, 1993\
35 The Regents of the University of California.  All rights reserved.");
36#if 0
37static char sccsid[] = "@(#)main.c	8.1 (Berkeley) 6/6/93";
38#endif
39__RCSID("$NetBSD: main.c,v 1.56 2021/08/21 13:22:19 christos Exp $");
40#endif /* not lint */
41
42#include <sys/param.h>
43#include <sys/sysctl.h>
44#include <sys/ioctl.h>
45
46#include <ctype.h>
47#include <err.h>
48#include <errno.h>
49#include <limits.h>
50#include <signal.h>
51#include <stdarg.h>
52#include <stdio.h>
53#include <stdlib.h>
54#include <string.h>
55#include <unistd.h>
56#include <termios.h>
57
58#include "systat.h"
59#include "extern.h"
60#include "drvstats.h"
61
62static int     dellave;
63
64kvm_t *kd;
65char	*memf = NULL;
66char	*nlistf = NULL;
67sig_t	sigtstpdfl;
68double avenrun[3];
69int     col;
70double	naptime = 1;
71int     verbose = 1;                    /* to report kvm read errs */
72int     hz, stathz, maxslp;
73char    c;
74char    *namp;
75char    hostname[MAXHOSTNAMELEN + 1];
76WINDOW  *wnd;
77int     CMDLINE;
78int     turns = 2;	/* stay how many refresh-turns in 'all' mode? */
79int     allflag;
80int     allcounter;
81sig_atomic_t needsredraw = 0;
82float	hertz;
83double	etime;
84bool	showzero = false;
85
86static	WINDOW *wload;			/* one line window for load average */
87
88static void (*sv_stop_handler)(int);
89
90static void stop(int);
91__dead static void usage(void);
92
93gid_t egid; /* XXX needed by initiostat() and initkre() */
94
95int
96main(int argc, char **argv)
97{
98	int ch;
99	char errbuf[_POSIX2_LINE_MAX];
100	const char *all;
101	struct clockinfo clk;
102	size_t len;
103	int bflag = 0;
104
105	all = "all";
106	egid = getegid();
107	(void)setegid(getgid());
108
109	while ((ch = getopt(argc, argv, "M:N:bnw:t:z")) != -1)
110		switch(ch) {
111		case 'M':
112			memf = optarg;
113			break;
114		case 'N':
115			nlistf = optarg;
116			break;
117		case 'b':
118			bflag = !bflag;
119			break;
120		case 'n':
121			nflag = !nflag;
122			break;
123		case 't':
124			if ((turns = atoi(optarg)) <= 0)
125				errx(EXIT_FAILURE, "turns <= 0.");
126			break;
127		case 'w':
128			if ((naptime = strtod(optarg, NULL)) <= 0)
129				errx(EXIT_FAILURE, "interval <= 0.");
130			break;
131		case 'z':
132			showzero = true;
133			break;
134		case '?':
135		default:
136			usage();
137		}
138	argc -= optind;
139	argv += optind;
140
141
142	for ( ; argc > 0; argc--, argv++) {
143		struct mode *p;
144		int modefound = 0;
145
146		if (isdigit((unsigned char)argv[0][0])) {
147			naptime = strtod(argv[0], NULL);
148			if (naptime <= 0)
149				naptime = 5;
150			continue;
151		}
152
153		for (p = modes; p->c_name ; p++) {
154			if (strstr(p->c_name, argv[0]) == p->c_name) {
155				curmode = p;
156				modefound++;
157				break;
158			}
159
160			if (strstr(all, argv[0]) == all) {
161				allcounter=0;
162				allflag=1;
163			}
164		}
165
166
167		if (!modefound && !allflag)
168			error("%s: Unknown command.", argv[0]);
169	}
170
171	/*
172	 * Discard setgid privileges.  If not the running kernel, we toss
173	 * them away totally so that bad guys can't print interesting stuff
174	 * from kernel memory, otherwise switch back to kmem for the
175	 * duration of the kvm_openfiles() call.
176	 */
177	if (nlistf != NULL || memf != NULL)
178		(void)setgid(getgid());
179	else
180		(void)setegid(egid);
181
182	kd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, errbuf);
183	if (kd == NULL)
184		errx(EXIT_FAILURE, "%s", errbuf);
185
186	/* Get rid of privs for now. */
187	if (nlistf == NULL && memf == NULL)
188		(void)setegid(getgid());
189
190	signal(SIGINT, die);
191	signal(SIGQUIT, die);
192	signal(SIGTERM, die);
193	sv_stop_handler = signal(SIGTSTP, stop);
194
195	/*
196	 * Initialize display.  Load average appears in a one line
197	 * window of its own.  Current command's display appears in
198	 * an overlapping sub-window of stdscr configured by the display
199	 * routines to minimize update work by curses.
200	 */
201	if (initscr() == NULL)
202		errx(EXIT_FAILURE, "couldn't initialize screen");
203
204	CMDLINE = LINES - 1;
205	wnd = (*curmode->c_open)();
206	if (wnd == NULL) {
207		move(CMDLINE, 0);
208		clrtoeol();
209		refresh();
210		endwin();
211		warnx("couldn't initialize display");
212		die(0);
213	}
214	wload = newwin(1, 0, 3, 20);
215	if (wload == NULL) {
216		move(CMDLINE, 0);
217		clrtoeol();
218		refresh();
219		endwin();
220		warnx("couldn't set up load average window");
221		die(0);
222	}
223	gethostname(hostname, sizeof (hostname));
224	hostname[sizeof(hostname) - 1] = '\0';
225
226	len = sizeof(clk);
227	if (sysctlbyname("kern.clockrate", &clk, &len, NULL, 0))
228		error("can't get \"kern.clockrate\": %s", strerror(errno));
229	hz = clk.hz;
230	stathz = clk.stathz;
231
232	len = sizeof(maxslp);
233	if (sysctlbyname("vm.maxslp", &maxslp, &len, NULL, 0))
234		error("can't get \"vm.maxslp\": %s", strerror(errno));
235
236	(*curmode->c_init)();
237	curmode->c_flags |= CF_INIT;
238	labels();
239
240	dellave = 0.0;
241
242	display(0);
243	if (!bflag) {
244		noecho();
245		cbreak();
246		keyboard();
247	} else
248		die(0);
249	/*NOTREACHED*/
250}
251
252static void
253usage(void)
254{
255	fprintf(stderr, "usage: %s [-bnz] [-M core] [-N system] [-w wait] "
256	    "[-t turns]\n\t\t[display] [refresh-interval]\n", getprogname());
257	exit(EXIT_FAILURE);
258}
259
260
261void
262labels(void)
263{
264	if (curmode->c_flags & CF_LOADAV) {
265		mvaddstr(2, 20,
266		    "/0   /1   /2   /3   /4   /5   /6   /7   /8   /9   /10");
267		mvaddstr(3, 5, "Load Average");
268	}
269	(*curmode->c_label)();
270#ifdef notdef
271	mvprintw(21, 25, "CPU usage on %s", hostname);
272#endif
273	refresh();
274}
275
276void
277display(int signo)
278{
279	static int skip;
280	int j;
281	struct mode *p;
282	int ms_delay;
283
284	if (signo == SIGALRM && skip-- > 0)
285		/* Don't display on this timeout */
286		return;
287
288	/* Get the load average over the last minute. */
289	(void)getloadavg(avenrun, sizeof(avenrun) / sizeof(avenrun[0]));
290	(*curmode->c_fetch)();
291	if (curmode->c_flags & CF_LOADAV) {
292		j = 5.0*avenrun[0] + 0.5;
293		dellave -= avenrun[0];
294		if (dellave >= 0.0)
295			c = '<';
296		else {
297			c = '>';
298			dellave = -dellave;
299		}
300		if (dellave < 0.1)
301			c = '|';
302		dellave = avenrun[0];
303		wmove(wload, 0, 0);
304		wclrtoeol(wload);
305		whline(wload, c, (j > 50) ? 50 : j);
306		if (j > 50)
307			wprintw(wload, " %4.1f", avenrun[0]);
308	}
309	(*curmode->c_refresh)();
310	if (curmode->c_flags & CF_LOADAV)
311		wrefresh(wload);
312	wrefresh(wnd);
313	move(CMDLINE, col);
314	refresh();
315
316	if (allflag && signo==SIGALRM) {
317		if (allcounter >= turns){
318			p = curmode;
319			p++;
320			if (p->c_name == NULL)
321				p = modes;
322			switch_mode(p);
323			allcounter=0;
324		} else
325			allcounter++;
326	}
327
328	/* curses timeout() uses VTIME, limited to 255 1/10th secs */
329	ms_delay = naptime * 1000;
330	if (ms_delay < 25500) {
331		timeout(ms_delay);
332		skip = 0;
333	} else {
334		skip = ms_delay / 25500;
335		timeout(ms_delay / (skip + 1));
336	}
337}
338
339void
340redraw(void)
341{
342	CMDLINE = LINES - 1;
343	labels();
344
345	display(0);
346	needsredraw = 0;
347}
348
349static void
350stop(int signo)
351{
352	sigset_t set;
353
354	signal(SIGTSTP, sv_stop_handler);
355	/* unblock SIGTSTP */
356	sigemptyset(&set);
357	sigaddset(&set, SIGTSTP);
358	sigprocmask(SIG_UNBLOCK, &set, NULL);
359	/* stop ourselves */
360	kill(0, SIGTSTP);
361	/* must have been restarted */
362	signal(SIGTSTP, stop);
363	needsredraw = signo;
364}
365
366void
367die(int signo)
368{
369	move(CMDLINE, 0);
370	clrtoeol();
371	refresh();
372	endwin();
373	exit(EXIT_SUCCESS);
374}
375
376void
377error(const char *fmt, ...)
378{
379	va_list ap;
380	char buf[255];
381	int oy, ox;
382
383	va_start(ap, fmt);
384
385	if (wnd) {
386		getyx(stdscr, oy, ox);
387		(void) vsnprintf(buf, sizeof(buf), fmt, ap);
388		clrtoeol();
389		standout();
390		mvaddstr(CMDLINE, 0, buf);
391		standend();
392		move(oy, ox);
393		refresh();
394	} else {
395		(void) vfprintf(stderr, fmt, ap);
396		fprintf(stderr, "\n");
397	}
398	va_end(ap);
399}
400
401void
402clearerror(void)
403{
404
405	error("%s", "");
406}
407
408void
409nlisterr(struct nlist name_list[])
410{
411	int i, n;
412
413	n = 0;
414	clear();
415	mvprintw(2, 10, "systat: nlist: can't find following symbols:");
416	for (i = 0;
417	    name_list[i].n_name != NULL && *name_list[i].n_name != '\0'; i++)
418		if (name_list[i].n_value == 0)
419			mvprintw(2 + ++n, 10, "%s", name_list[i].n_name);
420	move(CMDLINE, 0);
421	clrtoeol();
422	refresh();
423	endwin();
424	exit(EXIT_FAILURE);
425}
426
427bool
428toofast(int *failcnt)
429{
430	static char pigs[] = "pigs";
431	etime = cur.cp_etime;
432	/* < 1 ticks - sleep for a tick */
433	/* this is often triggered by repeated SIGWINCH */
434	if ((etime * hertz) >= 1.0)
435		return false;
436
437	if ((*failcnt)++ <= MAXFAIL) {
438		struct timespec interval = { 0, 1000000000L / hertz };
439		while (nanosleep(&interval, &interval) == -1)
440			continue;
441		return true;
442	}
443	clear();
444	mvprintw(2, 10, "The alternate system clock has died!");
445	mvprintw(3, 10, "Reverting to ``pigs'' display.");
446	move(CMDLINE, 0);
447	refresh();
448	failcnt = 0;
449	sleep(5);
450	command(pigs);
451	return true;
452}
453