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main.c revision 1.27 
      1 /*	$NetBSD: main.c,v 1.27 2000/08/25 04:48:56 hubertf 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. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by the University of
     18  *	California, Berkeley and its contributors.
     19  * 4. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  */
     35 
     36 #include <sys/cdefs.h>
     37 #ifndef lint
     38 __COPYRIGHT("@(#) Copyright (c) 1980, 1992, 1993\n\
     39 	The Regents of the University of California.  All rights reserved.\n");
     40 #if 0
     41 static char sccsid[] = "@(#)main.c	8.1 (Berkeley) 6/6/93";
     42 #endif
     43 __RCSID("$NetBSD: main.c,v 1.27 2000/08/25 04:48:56 hubertf Exp $");
     44 #endif /* not lint */
     45 
     46 #include <sys/param.h>
     47 
     48 #include <err.h>
     49 #include <limits.h>
     50 #include <nlist.h>
     51 #include <signal.h>
     52 #include <stdio.h>
     53 #include <string.h>
     54 #include <unistd.h>
     55 #include <stdlib.h>
     56 #include <ctype.h>
     57 #include <stdarg.h>
     58 
     59 #include "systat.h"
     60 #include "extern.h"
     61 
     62 static struct nlist namelist[] = {
     63 #define X_FIRST		0
     64 #define	X_HZ		0
     65 	{ "_hz" },
     66 #define	X_STATHZ		1
     67 	{ "_stathz" },
     68 	{ "" }
     69 };
     70 static int     dellave;
     71 
     72 kvm_t *kd;
     73 char	*memf = NULL;
     74 char	*nlistf = NULL;
     75 sig_t	sigtstpdfl;
     76 double avenrun[3];
     77 int     col;
     78 int	naptime = 5;
     79 int     verbose = 1;                    /* to report kvm read errs */
     80 int     hz, stathz;
     81 char    c;
     82 char    *namp;
     83 char    hostname[MAXHOSTNAMELEN + 1];
     84 WINDOW  *wnd;
     85 int     CMDLINE;
     86 int     turns = 2;	/* stay how many refresh-turns in 'all' mode? */
     87 int     allflag;
     88 int     allcounter;
     89 
     90 static	WINDOW *wload;			/* one line window for load average */
     91 
     92 static void usage(void);
     93 int main(int, char **);
     94 
     95 gid_t egid; /* XXX needed by initiostat() and initkre() */
     96 
     97 int
     98 main(int argc, char **argv)
     99 {
    100 	int ch;
    101 	char errbuf[_POSIX2_LINE_MAX];
    102 
    103 	egid = getegid();
    104 	(void)setegid(getgid());
    105 
    106 	while ((ch = getopt(argc, argv, "M:N:nw:t:")) != -1)
    107 		switch(ch) {
    108 		case 'M':
    109 			memf = optarg;
    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(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 	if (kvm_nlist(kd, namelist)) {
    184 		nlisterr(namelist);
    185 		exit(1);
    186 	}
    187 	if (namelist[X_FIRST].n_type == 0)
    188 		errx(1, "couldn't read namelist");
    189 	signal(SIGINT, die);
    190 	signal(SIGQUIT, die);
    191 	signal(SIGTERM, die);
    192 	signal(SIGWINCH, redraw);
    193 
    194 	/*
    195 	 * Initialize display.  Load average appears in a one line
    196 	 * window of its own.  Current command's display appears in
    197 	 * an overlapping sub-window of stdscr configured by the display
    198 	 * routines to minimize update work by curses.
    199 	 */
    200 	if (initscr() == NULL)
    201 	{
    202 		warnx("couldn't initialize screen");
    203 		exit(0);
    204 	}
    205 
    206 	CMDLINE = LINES - 1;
    207 	wnd = (*curmode->c_open)();
    208 	if (wnd == NULL) {
    209 		warnx("couldn't initialize display");
    210 		die(0);
    211 	}
    212 	wload = newwin(1, 0, 3, 20);
    213 	if (wload == NULL) {
    214 		warnx("couldn't set up load average window");
    215 		die(0);
    216 	}
    217 	gethostname(hostname, sizeof (hostname));
    218 	hostname[sizeof(hostname) - 1] = '\0';
    219 	NREAD(X_HZ, &hz, sizeof hz);
    220 	NREAD(X_STATHZ, &stathz, sizeof stathz);
    221 	(*curmode->c_init)();
    222 	curmode->c_flags |= CF_INIT;
    223 	labels();
    224 
    225 	dellave = 0.0;
    226 
    227 	signal(SIGALRM, display);
    228 	display(0);
    229 	noecho();
    230 	crmode();
    231 	keyboard();
    232 	/*NOTREACHED*/
    233 }
    234 
    235 static void
    236 usage(void)
    237 {
    238 	fprintf(stderr, "usage: systat [-n] [-M core] [-N system] [-w wait] "
    239 		"[-t turns]\n\t\t[display] [refresh-interval]\n");
    240 	exit(1);
    241 }
    242 
    243 
    244 void
    245 labels(void)
    246 {
    247 	if (curmode->c_flags & CF_LOADAV) {
    248 		mvaddstr(2, 20,
    249 		    "/0   /1   /2   /3   /4   /5   /6   /7   /8   /9   /10");
    250 		mvaddstr(3, 5, "Load Average");
    251 	}
    252 	(*curmode->c_label)();
    253 #ifdef notdef
    254 	mvprintw(21, 25, "CPU usage on %s", hostname);
    255 #endif
    256 	refresh();
    257 }
    258 
    259 void
    260 display(int signo)
    261 {
    262 	int j;
    263 	sigset_t set;
    264 	struct mode *p;
    265 
    266 	sigemptyset(&set);
    267 	sigaddset(&set, SIGALRM);
    268 	sigprocmask(SIG_BLOCK, &set, NULL);
    269 
    270 	/* Get the load average over the last minute. */
    271 	(void)getloadavg(avenrun, sizeof(avenrun) / sizeof(avenrun[0]));
    272 	(*curmode->c_fetch)();
    273 	if (curmode->c_flags & CF_LOADAV) {
    274 		j = 5.0*avenrun[0] + 0.5;
    275 		dellave -= avenrun[0];
    276 		if (dellave >= 0.0)
    277 			c = '<';
    278 		else {
    279 			c = '>';
    280 			dellave = -dellave;
    281 		}
    282 		if (dellave < 0.1)
    283 			c = '|';
    284 		dellave = avenrun[0];
    285 		wmove(wload, 0, 0);
    286 		wclrtoeol(wload);
    287 		whline(wload, c, (j > 50) ? 50 : j);
    288 		if (j > 50)
    289 			wprintw(wload, " %4.1f", avenrun[0]);
    290 	}
    291 	(*curmode->c_refresh)();
    292 	if (curmode->c_flags & CF_LOADAV)
    293 		wrefresh(wload);
    294 	wrefresh(wnd);
    295 	move(CMDLINE, col);
    296 	refresh();
    297 
    298 	if (allflag && signo==SIGALRM) {
    299 		if (allcounter >= turns){
    300 			p = curmode;
    301 			p++;
    302 			if (p->c_name == NULL)
    303 				p = modes;
    304 			switch_mode(p);
    305 			allcounter=0;
    306 		} else
    307 			allcounter++;
    308        }
    309 
    310 	sigprocmask(SIG_UNBLOCK, &set, NULL);
    311 	alarm(naptime);
    312 }
    313 
    314 void
    315 redraw(int signo)
    316 {
    317 	sigset_t set;
    318 
    319 	sigemptyset(&set);
    320 	sigaddset(&set, SIGALRM);
    321 	sigprocmask(SIG_BLOCK, &set, NULL);
    322 	wrefresh(curscr);
    323 	refresh();
    324 	sigprocmask(SIG_UNBLOCK, &set, NULL);
    325 }
    326 
    327 void
    328 die(int signo)
    329 {
    330 	move(CMDLINE, 0);
    331 	clrtoeol();
    332 	refresh();
    333 	endwin();
    334 	exit(0);
    335 }
    336 
    337 void
    338 error(const char *fmt, ...)
    339 {
    340 	va_list ap;
    341 	char buf[255];
    342 	int oy, ox;
    343 
    344 	va_start(ap, fmt);
    345 
    346 	if (wnd) {
    347 		getyx(stdscr, oy, ox);
    348 		(void) vsnprintf(buf, sizeof(buf), fmt, ap);
    349 		clrtoeol();
    350 		standout();
    351 		mvaddstr(CMDLINE, 0, buf);
    352 		standend();
    353 		move(oy, ox);
    354 		refresh();
    355 	} else {
    356 		(void) vfprintf(stderr, fmt, ap);
    357 		fprintf(stderr, "\n");
    358 	}
    359 	va_end(ap);
    360 }
    361 
    362 void
    363 nlisterr(struct nlist namelist[])
    364 {
    365 	int i, n;
    366 
    367 	n = 0;
    368 	clear();
    369 	mvprintw(2, 10, "systat: nlist: can't find following symbols:");
    370 	for (i = 0;
    371 	    namelist[i].n_name != NULL && *namelist[i].n_name != '\0'; i++)
    372 		if (namelist[i].n_value == 0)
    373 			mvprintw(2 + ++n, 10, "%s", namelist[i].n_name);
    374 	move(CMDLINE, 0);
    375 	clrtoeol();
    376 	refresh();
    377 	endwin();
    378 	exit(1);
    379 }
    380