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main.c revision 1.47 
      1 /*	$NetBSD: main.c,v 1.47 2012/11/23 03:47:36 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 1.47 2012/11/23 03:47:36 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 
     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 int	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 int	use_sysctl = 1;
     82 
     83 static	WINDOW *wload;			/* one line window for load average */
     84 
     85 static void (*sv_stop_handler)(int);
     86 
     87 static void stop(int);
     88 __dead static void usage(void);
     89 
     90 gid_t egid; /* XXX needed by initiostat() and initkre() */
     91 
     92 int
     93 main(int argc, char **argv)
     94 {
     95 	int ch;
     96 	char errbuf[_POSIX2_LINE_MAX];
     97 	const char *all;
     98 	struct clockinfo clk;
     99 	size_t len;
    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 			use_sysctl = 0;
    110 			break;
    111 		case 'N':
    112 			nlistf = optarg;
    113 			break;
    114 		case 'n':
    115 			nflag = !nflag;
    116 			break;
    117 		case 'w':
    118 			if ((naptime = atoi(optarg)) <= 0)
    119 				errx(1, "interval <= 0.");
    120 			break;
    121 		case 't':
    122 			if ((turns = atoi(optarg)) <= 0)
    123 				errx(1, "turns <= 0.");
    124 			break;
    125 		case '?':
    126 		default:
    127 			usage();
    128 		}
    129 	argc -= optind;
    130 	argv += optind;
    131 
    132 
    133 	for ( ; argc > 0; argc--, argv++) {
    134 		struct mode *p;
    135 		int modefound = 0;
    136 
    137 		if (isdigit((unsigned char)argv[0][0])) {
    138 			naptime = atoi(argv[0]);
    139 			if (naptime <= 0)
    140 				naptime = 5;
    141 			continue;
    142 		}
    143 
    144 		for (p = modes; p->c_name ; p++) {
    145 			if (strstr(p->c_name, argv[0]) == p->c_name) {
    146 				curmode = p;
    147 				modefound++;
    148 				break;
    149 			}
    150 
    151 			if (strstr(all, argv[0]) == all) {
    152 				allcounter=0;
    153 				allflag=1;
    154 			}
    155 		}
    156 
    157 
    158 		if (!modefound && !allflag)
    159 			error("%s: Unknown command.", argv[0]);
    160 	}
    161 
    162 	/*
    163 	 * Discard setgid privileges.  If not the running kernel, we toss
    164 	 * them away totally so that bad guys can't print interesting stuff
    165 	 * from kernel memory, otherwise switch back to kmem for the
    166 	 * duration of the kvm_openfiles() call.
    167 	 */
    168 	if (nlistf != NULL || memf != NULL)
    169 		(void)setgid(getgid());
    170 	else
    171 		(void)setegid(egid);
    172 
    173 	kd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, errbuf);
    174 	if (kd == NULL) {
    175 		error("%s", errbuf);
    176 		exit(1);
    177 	}
    178 
    179 	/* Get rid of privs for now. */
    180 	if (nlistf == NULL && memf == NULL)
    181 		(void)setegid(getgid());
    182 
    183 	signal(SIGINT, die);
    184 	signal(SIGQUIT, die);
    185 	signal(SIGTERM, die);
    186 	sv_stop_handler = signal(SIGTSTP, stop);
    187 
    188 	/*
    189 	 * Initialize display.  Load average appears in a one line
    190 	 * window of its own.  Current command's display appears in
    191 	 * an overlapping sub-window of stdscr configured by the display
    192 	 * routines to minimize update work by curses.
    193 	 */
    194 	if (initscr() == NULL)
    195 	{
    196 		warnx("couldn't initialize screen");
    197 		exit(0);
    198 	}
    199 
    200 	CMDLINE = LINES - 1;
    201 	wnd = (*curmode->c_open)();
    202 	if (wnd == NULL) {
    203 		warnx("couldn't initialize display");
    204 		die(0);
    205 	}
    206 	wload = newwin(1, 0, 3, 20);
    207 	if (wload == NULL) {
    208 		warnx("couldn't set up load average window");
    209 		die(0);
    210 	}
    211 	gethostname(hostname, sizeof (hostname));
    212 	hostname[sizeof(hostname) - 1] = '\0';
    213 
    214 	len = sizeof(clk);
    215 	if (sysctlbyname("kern.clockrate", &clk, &len, NULL, 0))
    216 		error("can't get \"kern.clockrate\": %s", strerror(errno));
    217 	hz = clk.hz;
    218 	stathz = clk.stathz;
    219 
    220 	len = sizeof(maxslp);
    221 	if (sysctlbyname("vm.maxslp", &maxslp, &len, NULL, 0))
    222 		error("can't get \"vm.maxslp\": %s", strerror(errno));
    223 
    224 	(*curmode->c_init)();
    225 	curmode->c_flags |= CF_INIT;
    226 	labels();
    227 
    228 	dellave = 0.0;
    229 
    230 	display(0);
    231 	noecho();
    232 	cbreak();
    233 	keyboard();
    234 	/*NOTREACHED*/
    235 }
    236 
    237 static void
    238 usage(void)
    239 {
    240 	fprintf(stderr, "usage: systat [-n] [-M core] [-N system] [-w wait] "
    241 		"[-t turns]\n\t\t[display] [refresh-interval]\n");
    242 	exit(1);
    243 }
    244 
    245 
    246 void
    247 labels(void)
    248 {
    249 	if (curmode->c_flags & CF_LOADAV) {
    250 		mvaddstr(2, 20,
    251 		    "/0   /1   /2   /3   /4   /5   /6   /7   /8   /9   /10");
    252 		mvaddstr(3, 5, "Load Average");
    253 	}
    254 	(*curmode->c_label)();
    255 #ifdef notdef
    256 	mvprintw(21, 25, "CPU usage on %s", hostname);
    257 #endif
    258 	refresh();
    259 }
    260 
    261 void
    262 display(int signo)
    263 {
    264 	static int skip;
    265 	int j;
    266 	struct mode *p;
    267 	int ms_delay;
    268 
    269 	if (signo == SIGALRM && skip-- > 0)
    270 		/* Don't display on this timeout */
    271 		return;
    272 
    273 	/* Get the load average over the last minute. */
    274 	(void)getloadavg(avenrun, sizeof(avenrun) / sizeof(avenrun[0]));
    275 	(*curmode->c_fetch)();
    276 	if (curmode->c_flags & CF_LOADAV) {
    277 		j = 5.0*avenrun[0] + 0.5;
    278 		dellave -= avenrun[0];
    279 		if (dellave >= 0.0)
    280 			c = '<';
    281 		else {
    282 			c = '>';
    283 			dellave = -dellave;
    284 		}
    285 		if (dellave < 0.1)
    286 			c = '|';
    287 		dellave = avenrun[0];
    288 		wmove(wload, 0, 0);
    289 		wclrtoeol(wload);
    290 		whline(wload, c, (j > 50) ? 50 : j);
    291 		if (j > 50)
    292 			wprintw(wload, " %4.1f", avenrun[0]);
    293 	}
    294 	(*curmode->c_refresh)();
    295 	if (curmode->c_flags & CF_LOADAV)
    296 		wrefresh(wload);
    297 	wrefresh(wnd);
    298 	move(CMDLINE, col);
    299 	refresh();
    300 
    301 	if (allflag && signo==SIGALRM) {
    302 		if (allcounter >= turns){
    303 			p = curmode;
    304 			p++;
    305 			if (p->c_name == NULL)
    306 				p = modes;
    307 			switch_mode(p);
    308 			allcounter=0;
    309 		} else
    310 			allcounter++;
    311 	}
    312 
    313 	/* curses timeout() uses VTIME, limited to 255 1/10th secs */
    314 	ms_delay = naptime * 1000;
    315 	if (ms_delay < 25500) {
    316 		timeout(ms_delay);
    317 		skip = 0;
    318 	} else {
    319 		skip = ms_delay / 25500;
    320 		timeout(ms_delay / (skip + 1));
    321 	}
    322 }
    323 
    324 void
    325 redraw(void)
    326 {
    327 	resizeterm(LINES, COLS);
    328 	CMDLINE = LINES - 1;
    329 	labels();
    330 
    331 	display(0);
    332 	needsredraw = 0;
    333 }
    334 
    335 static void
    336 stop(int signo)
    337 {
    338 	sigset_t set;
    339 
    340 	signal(SIGTSTP, sv_stop_handler);
    341 	/* unblock SIGTSTP */
    342 	sigemptyset(&set);
    343 	sigaddset(&set, SIGTSTP);
    344 	sigprocmask(SIG_UNBLOCK, &set, NULL);
    345 	/* stop ourselves */
    346 	kill(0, SIGTSTP);
    347 	/* must have been restarted */
    348 	signal(SIGTSTP, stop);
    349 	needsredraw = signo;
    350 }
    351 
    352 void
    353 die(int signo)
    354 {
    355 	move(CMDLINE, 0);
    356 	clrtoeol();
    357 	refresh();
    358 	endwin();
    359 	exit(0);
    360 }
    361 
    362 void
    363 error(const char *fmt, ...)
    364 {
    365 	va_list ap;
    366 	char buf[255];
    367 	int oy, ox;
    368 
    369 	va_start(ap, fmt);
    370 
    371 	if (wnd) {
    372 		getyx(stdscr, oy, ox);
    373 		(void) vsnprintf(buf, sizeof(buf), fmt, ap);
    374 		clrtoeol();
    375 		standout();
    376 		mvaddstr(CMDLINE, 0, buf);
    377 		standend();
    378 		move(oy, ox);
    379 		refresh();
    380 	} else {
    381 		(void) vfprintf(stderr, fmt, ap);
    382 		fprintf(stderr, "\n");
    383 	}
    384 	va_end(ap);
    385 }
    386 
    387 void
    388 nlisterr(struct nlist name_list[])
    389 {
    390 	int i, n;
    391 
    392 	n = 0;
    393 	clear();
    394 	mvprintw(2, 10, "systat: nlist: can't find following symbols:");
    395 	for (i = 0;
    396 	    name_list[i].n_name != NULL && *name_list[i].n_name != '\0'; i++)
    397 		if (name_list[i].n_value == 0)
    398 			mvprintw(2 + ++n, 10, "%s", name_list[i].n_name);
    399 	move(CMDLINE, 0);
    400 	clrtoeol();
    401 	refresh();
    402 	sleep(5);
    403 	endwin();
    404 	exit(1);
    405 }
    406