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main.c revision 1.55 
      1 /*	$NetBSD: main.c,v 1.55 2019/01/25 15:31:11 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
     37 static char sccsid[] = "@(#)main.c	8.1 (Berkeley) 6/6/93";
     38 #endif
     39 __RCSID("$NetBSD: main.c,v 1.55 2019/01/25 15:31:11 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 
     62 static int     dellave;
     63 
     64 kvm_t *kd;
     65 char	*memf = NULL;
     66 char	*nlistf = NULL;
     67 sig_t	sigtstpdfl;
     68 double avenrun[3];
     69 int     col;
     70 double	naptime = 1;
     71 int     verbose = 1;                    /* to report kvm read errs */
     72 int     hz, stathz, maxslp;
     73 char    c;
     74 char    *namp;
     75 char    hostname[MAXHOSTNAMELEN + 1];
     76 WINDOW  *wnd;
     77 int     CMDLINE;
     78 int     turns = 2;	/* stay how many refresh-turns in 'all' mode? */
     79 int     allflag;
     80 int     allcounter;
     81 sig_atomic_t needsredraw = 0;
     82 float	hertz;
     83 double	etime;
     84 
     85 static	WINDOW *wload;			/* one line window for load average */
     86 
     87 static void (*sv_stop_handler)(int);
     88 
     89 static void stop(int);
     90 __dead static void usage(void);
     91 
     92 gid_t egid; /* XXX needed by initiostat() and initkre() */
     93 
     94 int
     95 main(int argc, char **argv)
     96 {
     97 	int ch;
     98 	char errbuf[_POSIX2_LINE_MAX];
     99 	const char *all;
    100 	struct clockinfo clk;
    101 	size_t len;
    102 	int bflag = 0;
    103 
    104 	all = "all";
    105 	egid = getegid();
    106 	(void)setegid(getgid());
    107 
    108 	while ((ch = getopt(argc, argv, "M:N:bnw:t:")) != -1)
    109 		switch(ch) {
    110 		case 'M':
    111 			memf = optarg;
    112 			break;
    113 		case 'N':
    114 			nlistf = optarg;
    115 			break;
    116 		case 'b':
    117 			bflag = !bflag;
    118 			break;
    119 		case 'n':
    120 			nflag = !nflag;
    121 			break;
    122 		case 't':
    123 			if ((turns = atoi(optarg)) <= 0)
    124 				errx(1, "turns <= 0.");
    125 			break;
    126 		case 'w':
    127 			if ((naptime = strtod(optarg, NULL)) <= 0)
    128 				errx(1, "interval <= 0.");
    129 			break;
    130 		case '?':
    131 		default:
    132 			usage();
    133 		}
    134 	argc -= optind;
    135 	argv += optind;
    136 
    137 
    138 	for ( ; argc > 0; argc--, argv++) {
    139 		struct mode *p;
    140 		int modefound = 0;
    141 
    142 		if (isdigit((unsigned char)argv[0][0])) {
    143 			naptime = strtod(argv[0], NULL);
    144 			if (naptime <= 0)
    145 				naptime = 5;
    146 			continue;
    147 		}
    148 
    149 		for (p = modes; p->c_name ; p++) {
    150 			if (strstr(p->c_name, argv[0]) == p->c_name) {
    151 				curmode = p;
    152 				modefound++;
    153 				break;
    154 			}
    155 
    156 			if (strstr(all, argv[0]) == all) {
    157 				allcounter=0;
    158 				allflag=1;
    159 			}
    160 		}
    161 
    162 
    163 		if (!modefound && !allflag)
    164 			error("%s: Unknown command.", argv[0]);
    165 	}
    166 
    167 	/*
    168 	 * Discard setgid privileges.  If not the running kernel, we toss
    169 	 * them away totally so that bad guys can't print interesting stuff
    170 	 * from kernel memory, otherwise switch back to kmem for the
    171 	 * duration of the kvm_openfiles() call.
    172 	 */
    173 	if (nlistf != NULL || memf != NULL)
    174 		(void)setgid(getgid());
    175 	else
    176 		(void)setegid(egid);
    177 
    178 	kd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, errbuf);
    179 	if (kd == NULL)
    180 		errx(1, "%s", errbuf);
    181 
    182 	/* Get rid of privs for now. */
    183 	if (nlistf == NULL && memf == NULL)
    184 		(void)setegid(getgid());
    185 
    186 	signal(SIGINT, die);
    187 	signal(SIGQUIT, die);
    188 	signal(SIGTERM, die);
    189 	sv_stop_handler = signal(SIGTSTP, stop);
    190 
    191 	/*
    192 	 * Initialize display.  Load average appears in a one line
    193 	 * window of its own.  Current command's display appears in
    194 	 * an overlapping sub-window of stdscr configured by the display
    195 	 * routines to minimize update work by curses.
    196 	 */
    197 	if (initscr() == NULL)
    198 		errx(1, "couldn't initialize screen");
    199 
    200 	CMDLINE = LINES - 1;
    201 	wnd = (*curmode->c_open)();
    202 	if (wnd == NULL) {
    203 		move(CMDLINE, 0);
    204 		clrtoeol();
    205 		refresh();
    206 		endwin();
    207 		warnx("couldn't initialize display");
    208 		die(0);
    209 	}
    210 	wload = newwin(1, 0, 3, 20);
    211 	if (wload == NULL) {
    212 		move(CMDLINE, 0);
    213 		clrtoeol();
    214 		refresh();
    215 		endwin();
    216 		warnx("couldn't set up load average window");
    217 		die(0);
    218 	}
    219 	gethostname(hostname, sizeof (hostname));
    220 	hostname[sizeof(hostname) - 1] = '\0';
    221 
    222 	len = sizeof(clk);
    223 	if (sysctlbyname("kern.clockrate", &clk, &len, NULL, 0))
    224 		error("can't get \"kern.clockrate\": %s", strerror(errno));
    225 	hz = clk.hz;
    226 	stathz = clk.stathz;
    227 
    228 	len = sizeof(maxslp);
    229 	if (sysctlbyname("vm.maxslp", &maxslp, &len, NULL, 0))
    230 		error("can't get \"vm.maxslp\": %s", strerror(errno));
    231 
    232 	(*curmode->c_init)();
    233 	curmode->c_flags |= CF_INIT;
    234 	labels();
    235 
    236 	dellave = 0.0;
    237 
    238 	display(0);
    239 	if (!bflag) {
    240 		noecho();
    241 		cbreak();
    242 		keyboard();
    243 	} else
    244 		die(0);
    245 	/*NOTREACHED*/
    246 }
    247 
    248 static void
    249 usage(void)
    250 {
    251 	fprintf(stderr, "usage: systat [-bn] [-M core] [-N system] [-w wait] "
    252 		"[-t turns]\n\t\t[display] [refresh-interval]\n");
    253 	exit(1);
    254 }
    255 
    256 
    257 void
    258 labels(void)
    259 {
    260 	if (curmode->c_flags & CF_LOADAV) {
    261 		mvaddstr(2, 20,
    262 		    "/0   /1   /2   /3   /4   /5   /6   /7   /8   /9   /10");
    263 		mvaddstr(3, 5, "Load Average");
    264 	}
    265 	(*curmode->c_label)();
    266 #ifdef notdef
    267 	mvprintw(21, 25, "CPU usage on %s", hostname);
    268 #endif
    269 	refresh();
    270 }
    271 
    272 void
    273 display(int signo)
    274 {
    275 	static int skip;
    276 	int j;
    277 	struct mode *p;
    278 	int ms_delay;
    279 
    280 	if (signo == SIGALRM && skip-- > 0)
    281 		/* Don't display on this timeout */
    282 		return;
    283 
    284 	/* Get the load average over the last minute. */
    285 	(void)getloadavg(avenrun, sizeof(avenrun) / sizeof(avenrun[0]));
    286 	(*curmode->c_fetch)();
    287 	if (curmode->c_flags & CF_LOADAV) {
    288 		j = 5.0*avenrun[0] + 0.5;
    289 		dellave -= avenrun[0];
    290 		if (dellave >= 0.0)
    291 			c = '<';
    292 		else {
    293 			c = '>';
    294 			dellave = -dellave;
    295 		}
    296 		if (dellave < 0.1)
    297 			c = '|';
    298 		dellave = avenrun[0];
    299 		wmove(wload, 0, 0);
    300 		wclrtoeol(wload);
    301 		whline(wload, c, (j > 50) ? 50 : j);
    302 		if (j > 50)
    303 			wprintw(wload, " %4.1f", avenrun[0]);
    304 	}
    305 	(*curmode->c_refresh)();
    306 	if (curmode->c_flags & CF_LOADAV)
    307 		wrefresh(wload);
    308 	wrefresh(wnd);
    309 	move(CMDLINE, col);
    310 	refresh();
    311 
    312 	if (allflag && signo==SIGALRM) {
    313 		if (allcounter >= turns){
    314 			p = curmode;
    315 			p++;
    316 			if (p->c_name == NULL)
    317 				p = modes;
    318 			switch_mode(p);
    319 			allcounter=0;
    320 		} else
    321 			allcounter++;
    322 	}
    323 
    324 	/* curses timeout() uses VTIME, limited to 255 1/10th secs */
    325 	ms_delay = naptime * 1000;
    326 	if (ms_delay < 25500) {
    327 		timeout(ms_delay);
    328 		skip = 0;
    329 	} else {
    330 		skip = ms_delay / 25500;
    331 		timeout(ms_delay / (skip + 1));
    332 	}
    333 }
    334 
    335 void
    336 redraw(void)
    337 {
    338 	CMDLINE = LINES - 1;
    339 	labels();
    340 
    341 	display(0);
    342 	needsredraw = 0;
    343 }
    344 
    345 static void
    346 stop(int signo)
    347 {
    348 	sigset_t set;
    349 
    350 	signal(SIGTSTP, sv_stop_handler);
    351 	/* unblock SIGTSTP */
    352 	sigemptyset(&set);
    353 	sigaddset(&set, SIGTSTP);
    354 	sigprocmask(SIG_UNBLOCK, &set, NULL);
    355 	/* stop ourselves */
    356 	kill(0, SIGTSTP);
    357 	/* must have been restarted */
    358 	signal(SIGTSTP, stop);
    359 	needsredraw = signo;
    360 }
    361 
    362 void
    363 die(int signo)
    364 {
    365 	move(CMDLINE, 0);
    366 	clrtoeol();
    367 	refresh();
    368 	endwin();
    369 	exit(0);
    370 }
    371 
    372 void
    373 error(const char *fmt, ...)
    374 {
    375 	va_list ap;
    376 	char buf[255];
    377 	int oy, ox;
    378 
    379 	va_start(ap, fmt);
    380 
    381 	if (wnd) {
    382 		getyx(stdscr, oy, ox);
    383 		(void) vsnprintf(buf, sizeof(buf), fmt, ap);
    384 		clrtoeol();
    385 		standout();
    386 		mvaddstr(CMDLINE, 0, buf);
    387 		standend();
    388 		move(oy, ox);
    389 		refresh();
    390 	} else {
    391 		(void) vfprintf(stderr, fmt, ap);
    392 		fprintf(stderr, "\n");
    393 	}
    394 	va_end(ap);
    395 }
    396 
    397 void
    398 clearerror(void)
    399 {
    400 
    401 	error("%s", "");
    402 }
    403 
    404 void
    405 nlisterr(struct nlist name_list[])
    406 {
    407 	int i, n;
    408 
    409 	n = 0;
    410 	clear();
    411 	mvprintw(2, 10, "systat: nlist: can't find following symbols:");
    412 	for (i = 0;
    413 	    name_list[i].n_name != NULL && *name_list[i].n_name != '\0'; i++)
    414 		if (name_list[i].n_value == 0)
    415 			mvprintw(2 + ++n, 10, "%s", name_list[i].n_name);
    416 	move(CMDLINE, 0);
    417 	clrtoeol();
    418 	refresh();
    419 	endwin();
    420 	exit(1);
    421 }
    422 
    423 bool
    424 toofast(int *failcnt)
    425 {
    426 	static char pigs[] = "pigs";
    427 	etime = cur.cp_etime;
    428 	/* < 1 ticks - sleep for a tick */
    429 	/* this is often triggered by repeated SIGWINCH */
    430 	if ((etime * hertz) >= 1.0)
    431 		return false;
    432 
    433 	if ((*failcnt)++ <= MAXFAIL) {
    434 		struct timespec interval = { 0, 1000000000L / hertz };
    435 		while (nanosleep(&interval, &interval) == -1)
    436 			continue;
    437 		return true;
    438 	}
    439 	clear();
    440 	mvprintw(2, 10, "The alternate system clock has died!");
    441 	mvprintw(3, 10, "Reverting to ``pigs'' display.");
    442 	move(CMDLINE, 0);
    443 	refresh();
    444 	failcnt = 0;
    445 	sleep(5);
    446 	command(pigs);
    447 	return true;
    448 }
    449