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main.c revision 1.51 
      1 /*	$NetBSD: main.c,v 1.51 2016/12/03 03:26:27 mrg 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 1.51 2016/12/03 03:26:27 mrg 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 
     61 static int     dellave;
     62 
     63 kvm_t *kd;
     64 char	*memf = NULL;
     65 char	*nlistf = NULL;
     66 sig_t	sigtstpdfl;
     67 double avenrun[3];
     68 int     col;
     69 double	naptime = 5;
     70 int     verbose = 1;                    /* to report kvm read errs */
     71 int     hz, stathz, maxslp;
     72 char    c;
     73 char    *namp;
     74 char    hostname[MAXHOSTNAMELEN + 1];
     75 WINDOW  *wnd;
     76 int     CMDLINE;
     77 int     turns = 2;	/* stay how many refresh-turns in 'all' mode? */
     78 int     allflag;
     79 int     allcounter;
     80 sig_atomic_t needsredraw = 0;
     81 
     82 static	WINDOW *wload;			/* one line window for load average */
     83 
     84 static void (*sv_stop_handler)(int);
     85 
     86 static void stop(int);
     87 __dead static void usage(void);
     88 
     89 gid_t egid; /* XXX needed by initiostat() and initkre() */
     90 
     91 int
     92 main(int argc, char **argv)
     93 {
     94 	int ch;
     95 	char errbuf[_POSIX2_LINE_MAX];
     96 	const char *all;
     97 	struct clockinfo clk;
     98 	size_t len;
     99 	int bflag = 0;
    100 
    101 	all = "all";
    102 	egid = getegid();
    103 	(void)setegid(getgid());
    104 
    105 	while ((ch = getopt(argc, argv, "M:N:nw:t:")) != -1)
    106 		switch(ch) {
    107 		case 'M':
    108 			memf = optarg;
    109 			break;
    110 		case 'N':
    111 			nlistf = optarg;
    112 			break;
    113 		case 'n':
    114 			nflag = !nflag;
    115 			break;
    116 		case 'w':
    117 			if ((naptime = strtod(optarg, NULL)) <= 0)
    118 				errx(1, "interval <= 0.");
    119 			break;
    120 		case 't':
    121 			if ((turns = atoi(optarg)) <= 0)
    122 				errx(1, "turns <= 0.");
    123 			break;
    124 		case 'b':
    125 			bflag = !bflag;
    126 			break;
    127 		case '?':
    128 		default:
    129 			usage();
    130 		}
    131 	argc -= optind;
    132 	argv += optind;
    133 
    134 
    135 	for ( ; argc > 0; argc--, argv++) {
    136 		struct mode *p;
    137 		int modefound = 0;
    138 
    139 		if (isdigit((unsigned char)argv[0][0])) {
    140 			naptime = strtod(argv[0], NULL);
    141 			if (naptime <= 0)
    142 				naptime = 5;
    143 			continue;
    144 		}
    145 
    146 		for (p = modes; p->c_name ; p++) {
    147 			if (strstr(p->c_name, argv[0]) == p->c_name) {
    148 				curmode = p;
    149 				modefound++;
    150 				break;
    151 			}
    152 
    153 			if (strstr(all, argv[0]) == all) {
    154 				allcounter=0;
    155 				allflag=1;
    156 			}
    157 		}
    158 
    159 
    160 		if (!modefound && !allflag)
    161 			error("%s: Unknown command.", argv[0]);
    162 	}
    163 
    164 	/*
    165 	 * Discard setgid privileges.  If not the running kernel, we toss
    166 	 * them away totally so that bad guys can't print interesting stuff
    167 	 * from kernel memory, otherwise switch back to kmem for the
    168 	 * duration of the kvm_openfiles() call.
    169 	 */
    170 	if (nlistf != NULL || memf != NULL)
    171 		(void)setgid(getgid());
    172 	else
    173 		(void)setegid(egid);
    174 
    175 	kd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, errbuf);
    176 	if (kd == NULL) {
    177 		error("%s", errbuf);
    178 		exit(1);
    179 	}
    180 
    181 	/* Get rid of privs for now. */
    182 	if (nlistf == NULL && memf == NULL)
    183 		(void)setegid(getgid());
    184 
    185 	signal(SIGINT, die);
    186 	signal(SIGQUIT, die);
    187 	signal(SIGTERM, die);
    188 	sv_stop_handler = signal(SIGTSTP, stop);
    189 
    190 	/*
    191 	 * Initialize display.  Load average appears in a one line
    192 	 * window of its own.  Current command's display appears in
    193 	 * an overlapping sub-window of stdscr configured by the display
    194 	 * routines to minimize update work by curses.
    195 	 */
    196 	if (initscr() == NULL)
    197 	{
    198 		warnx("couldn't initialize screen");
    199 		exit(0);
    200 	}
    201 
    202 	CMDLINE = LINES - 1;
    203 	wnd = (*curmode->c_open)();
    204 	if (wnd == NULL) {
    205 		warnx("couldn't initialize display");
    206 		die(0);
    207 	}
    208 	wload = newwin(1, 0, 3, 20);
    209 	if (wload == NULL) {
    210 		warnx("couldn't set up load average window");
    211 		die(0);
    212 	}
    213 	gethostname(hostname, sizeof (hostname));
    214 	hostname[sizeof(hostname) - 1] = '\0';
    215 
    216 	len = sizeof(clk);
    217 	if (sysctlbyname("kern.clockrate", &clk, &len, NULL, 0))
    218 		error("can't get \"kern.clockrate\": %s", strerror(errno));
    219 	hz = clk.hz;
    220 	stathz = clk.stathz;
    221 
    222 	len = sizeof(maxslp);
    223 	if (sysctlbyname("vm.maxslp", &maxslp, &len, NULL, 0))
    224 		error("can't get \"vm.maxslp\": %s", strerror(errno));
    225 
    226 	(*curmode->c_init)();
    227 	curmode->c_flags |= CF_INIT;
    228 	labels();
    229 
    230 	dellave = 0.0;
    231 
    232 	display(0);
    233 	if (!bflag) {
    234 		noecho();
    235 		cbreak();
    236 		keyboard();
    237 	} else
    238 		die(0);
    239 	/*NOTREACHED*/
    240 }
    241 
    242 static void
    243 usage(void)
    244 {
    245 	fprintf(stderr, "usage: systat [-n] [-M core] [-N system] [-w wait] "
    246 		"[-t turns]\n\t\t[display] [refresh-interval]\n");
    247 	exit(1);
    248 }
    249 
    250 
    251 void
    252 labels(void)
    253 {
    254 	if (curmode->c_flags & CF_LOADAV) {
    255 		mvaddstr(2, 20,
    256 		    "/0   /1   /2   /3   /4   /5   /6   /7   /8   /9   /10");
    257 		mvaddstr(3, 5, "Load Average");
    258 	}
    259 	(*curmode->c_label)();
    260 #ifdef notdef
    261 	mvprintw(21, 25, "CPU usage on %s", hostname);
    262 #endif
    263 	refresh();
    264 }
    265 
    266 void
    267 display(int signo)
    268 {
    269 	static int skip;
    270 	int j;
    271 	struct mode *p;
    272 	int ms_delay;
    273 
    274 	if (signo == SIGALRM && skip-- > 0)
    275 		/* Don't display on this timeout */
    276 		return;
    277 
    278 	/* Get the load average over the last minute. */
    279 	(void)getloadavg(avenrun, sizeof(avenrun) / sizeof(avenrun[0]));
    280 	(*curmode->c_fetch)();
    281 	if (curmode->c_flags & CF_LOADAV) {
    282 		j = 5.0*avenrun[0] + 0.5;
    283 		dellave -= avenrun[0];
    284 		if (dellave >= 0.0)
    285 			c = '<';
    286 		else {
    287 			c = '>';
    288 			dellave = -dellave;
    289 		}
    290 		if (dellave < 0.1)
    291 			c = '|';
    292 		dellave = avenrun[0];
    293 		wmove(wload, 0, 0);
    294 		wclrtoeol(wload);
    295 		whline(wload, c, (j > 50) ? 50 : j);
    296 		if (j > 50)
    297 			wprintw(wload, " %4.1f", avenrun[0]);
    298 	}
    299 	(*curmode->c_refresh)();
    300 	if (curmode->c_flags & CF_LOADAV)
    301 		wrefresh(wload);
    302 	wrefresh(wnd);
    303 	move(CMDLINE, col);
    304 	refresh();
    305 
    306 	if (allflag && signo==SIGALRM) {
    307 		if (allcounter >= turns){
    308 			p = curmode;
    309 			p++;
    310 			if (p->c_name == NULL)
    311 				p = modes;
    312 			switch_mode(p);
    313 			allcounter=0;
    314 		} else
    315 			allcounter++;
    316 	}
    317 
    318 	/* curses timeout() uses VTIME, limited to 255 1/10th secs */
    319 	ms_delay = naptime * 1000;
    320 	if (ms_delay < 25500) {
    321 		timeout(ms_delay);
    322 		skip = 0;
    323 	} else {
    324 		skip = ms_delay / 25500;
    325 		timeout(ms_delay / (skip + 1));
    326 	}
    327 }
    328 
    329 void
    330 redraw(void)
    331 {
    332 	resizeterm(LINES, COLS);
    333 	CMDLINE = LINES - 1;
    334 	labels();
    335 
    336 	display(0);
    337 	needsredraw = 0;
    338 }
    339 
    340 static void
    341 stop(int signo)
    342 {
    343 	sigset_t set;
    344 
    345 	signal(SIGTSTP, sv_stop_handler);
    346 	/* unblock SIGTSTP */
    347 	sigemptyset(&set);
    348 	sigaddset(&set, SIGTSTP);
    349 	sigprocmask(SIG_UNBLOCK, &set, NULL);
    350 	/* stop ourselves */
    351 	kill(0, SIGTSTP);
    352 	/* must have been restarted */
    353 	signal(SIGTSTP, stop);
    354 	needsredraw = signo;
    355 }
    356 
    357 void
    358 die(int signo)
    359 {
    360 	move(CMDLINE, 0);
    361 	clrtoeol();
    362 	refresh();
    363 	endwin();
    364 	exit(0);
    365 }
    366 
    367 void
    368 error(const char *fmt, ...)
    369 {
    370 	va_list ap;
    371 	char buf[255];
    372 	int oy, ox;
    373 
    374 	va_start(ap, fmt);
    375 
    376 	if (wnd) {
    377 		getyx(stdscr, oy, ox);
    378 		(void) vsnprintf(buf, sizeof(buf), fmt, ap);
    379 		clrtoeol();
    380 		standout();
    381 		mvaddstr(CMDLINE, 0, buf);
    382 		standend();
    383 		move(oy, ox);
    384 		refresh();
    385 	} else {
    386 		(void) vfprintf(stderr, fmt, ap);
    387 		fprintf(stderr, "\n");
    388 	}
    389 	va_end(ap);
    390 }
    391 
    392 void
    393 clearerror(void)
    394 {
    395 
    396 	error("%s", "");
    397 }
    398 
    399 void
    400 nlisterr(struct nlist name_list[])
    401 {
    402 	int i, n;
    403 
    404 	n = 0;
    405 	clear();
    406 	mvprintw(2, 10, "systat: nlist: can't find following symbols:");
    407 	for (i = 0;
    408 	    name_list[i].n_name != NULL && *name_list[i].n_name != '\0'; i++)
    409 		if (name_list[i].n_value == 0)
    410 			mvprintw(2 + ++n, 10, "%s", name_list[i].n_name);
    411 	move(CMDLINE, 0);
    412 	clrtoeol();
    413 	refresh();
    414 	sleep(5);
    415 	endwin();
    416 	exit(1);
    417 }
    418