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main.c revision 1.29 
      1 /*	$NetBSD: main.c,v 1.29 2001/07/14 07:09:11 matt 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 1.29 2001/07/14 07:09:11 matt Exp $");
     44 #endif /* not lint */
     45 
     46 #include <sys/param.h>
     47 
     48 #include <ctype.h>
     49 #include <err.h>
     50 #include <limits.h>
     51 #include <signal.h>
     52 #include <stdarg.h>
     53 #include <stdio.h>
     54 #include <stdlib.h>
     55 #include <string.h>
     56 #include <unistd.h>
     57 
     58 #include "systat.h"
     59 #include "extern.h"
     60 
     61 static struct nlist namelist[] = {
     62 #define X_FIRST		0
     63 #define	X_HZ		0
     64 	{ "_hz" },
     65 #define	X_STATHZ		1
     66 	{ "_stathz" },
     67 #define	X_MAXSLP		2
     68 	{ "_maxslp" },
     69 	{ "" }
     70 };
     71 static int     dellave;
     72 
     73 kvm_t *kd;
     74 char	*memf = NULL;
     75 char	*nlistf = NULL;
     76 sig_t	sigtstpdfl;
     77 double avenrun[3];
     78 int     col;
     79 int	naptime = 5;
     80 int     verbose = 1;                    /* to report kvm read errs */
     81 int     hz, stathz, maxslp;
     82 char    c;
     83 char    *namp;
     84 char    hostname[MAXHOSTNAMELEN + 1];
     85 WINDOW  *wnd;
     86 int     CMDLINE;
     87 int     turns = 2;	/* stay how many refresh-turns in 'all' mode? */
     88 int     allflag;
     89 int     allcounter;
     90 
     91 static	WINDOW *wload;			/* one line window for load average */
     92 
     93 static void usage(void);
     94 int main(int, char **);
     95 
     96 gid_t egid; /* XXX needed by initiostat() and initkre() */
     97 
     98 int
     99 main(int argc, char **argv)
    100 {
    101 	int ch;
    102 	char errbuf[_POSIX2_LINE_MAX];
    103 
    104 	egid = getegid();
    105 	(void)setegid(getgid());
    106 
    107 	while ((ch = getopt(argc, argv, "M:N:nw:t:")) != -1)
    108 		switch(ch) {
    109 		case 'M':
    110 			memf = optarg;
    111 			break;
    112 		case 'N':
    113 			nlistf = optarg;
    114 			break;
    115 		case 'n':
    116 			nflag = !nflag;
    117 			break;
    118 		case 'w':
    119 			if ((naptime = atoi(optarg)) <= 0)
    120 				errx(1, "interval <= 0.");
    121 			break;
    122 		case 't':
    123 			if ((turns = atoi(optarg)) <= 0)
    124 				errx(1, "turns <= 0.");
    125 			break;
    126 		case '?':
    127 		default:
    128 			usage();
    129 		}
    130 	argc -= optind;
    131 	argv += optind;
    132 
    133 
    134 	for ( ; argc > 0; argc--, argv++) {
    135 		struct mode *p;
    136 		int modefound = 0;
    137 
    138 		if (isdigit(argv[0][0])) {
    139 			naptime = atoi(argv[0]);
    140 			if (naptime <= 0)
    141 				naptime = 5;
    142 			continue;
    143 		}
    144 
    145 		for (p = modes; p->c_name ; p++) {
    146 			if (strstr(p->c_name, argv[0]) == p->c_name) {
    147 				curmode = p;
    148 				modefound++;
    149 				break;
    150 			}
    151 
    152 			if(strstr("all",argv[0]) == "all"){
    153 				allcounter=0;
    154 				allflag=1;
    155 			}
    156 		}
    157 
    158 
    159 		if (!modefound && !allflag)
    160 			error("%s: Unknown command.", argv[0]);
    161 	}
    162 
    163 	/*
    164 	 * Discard setgid privileges.  If not the running kernel, we toss
    165 	 * them away totally so that bad guys can't print interesting stuff
    166 	 * from kernel memory, otherwise switch back to kmem for the
    167 	 * duration of the kvm_openfiles() call.
    168 	 */
    169 	if (nlistf != NULL || memf != NULL)
    170 		(void)setgid(getgid());
    171 	else
    172 		(void)setegid(egid);
    173 
    174 	kd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, errbuf);
    175 	if (kd == NULL) {
    176 		error("%s", errbuf);
    177 		exit(1);
    178 	}
    179 
    180 	/* Get rid of privs for now. */
    181 	if (nlistf == NULL && memf == NULL)
    182 		(void)setegid(getgid());
    183 
    184 	if (kvm_nlist(kd, namelist)) {
    185 		nlisterr(namelist);
    186 		exit(1);
    187 	}
    188 	if (namelist[X_FIRST].n_type == 0)
    189 		errx(1, "couldn't read namelist");
    190 	signal(SIGINT, die);
    191 	signal(SIGQUIT, die);
    192 	signal(SIGTERM, die);
    193 	signal(SIGWINCH, redraw);
    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 	{
    203 		warnx("couldn't initialize screen");
    204 		exit(0);
    205 	}
    206 
    207 	CMDLINE = LINES - 1;
    208 	wnd = (*curmode->c_open)();
    209 	if (wnd == NULL) {
    210 		warnx("couldn't initialize display");
    211 		die(0);
    212 	}
    213 	wload = newwin(1, 0, 3, 20);
    214 	if (wload == NULL) {
    215 		warnx("couldn't set up load average window");
    216 		die(0);
    217 	}
    218 	gethostname(hostname, sizeof (hostname));
    219 	hostname[sizeof(hostname) - 1] = '\0';
    220 	NREAD(X_HZ, &hz, sizeof hz);
    221 	NREAD(X_STATHZ, &stathz, sizeof stathz);
    222 	NREAD(X_MAXSLP, &maxslp, sizeof maxslp);
    223 	(*curmode->c_init)();
    224 	curmode->c_flags |= CF_INIT;
    225 	labels();
    226 
    227 	dellave = 0.0;
    228 
    229 	signal(SIGALRM, display);
    230 	display(0);
    231 	noecho();
    232 	crmode();
    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 	int j;
    265 	sigset_t set;
    266 	struct mode *p;
    267 
    268 	sigemptyset(&set);
    269 	sigaddset(&set, SIGALRM);
    270 	sigprocmask(SIG_BLOCK, &set, NULL);
    271 
    272 	/* Get the load average over the last minute. */
    273 	(void)getloadavg(avenrun, sizeof(avenrun) / sizeof(avenrun[0]));
    274 	(*curmode->c_fetch)();
    275 	if (curmode->c_flags & CF_LOADAV) {
    276 		j = 5.0*avenrun[0] + 0.5;
    277 		dellave -= avenrun[0];
    278 		if (dellave >= 0.0)
    279 			c = '<';
    280 		else {
    281 			c = '>';
    282 			dellave = -dellave;
    283 		}
    284 		if (dellave < 0.1)
    285 			c = '|';
    286 		dellave = avenrun[0];
    287 		wmove(wload, 0, 0);
    288 		wclrtoeol(wload);
    289 		whline(wload, c, (j > 50) ? 50 : j);
    290 		if (j > 50)
    291 			wprintw(wload, " %4.1f", avenrun[0]);
    292 	}
    293 	(*curmode->c_refresh)();
    294 	if (curmode->c_flags & CF_LOADAV)
    295 		wrefresh(wload);
    296 	wrefresh(wnd);
    297 	move(CMDLINE, col);
    298 	refresh();
    299 
    300 	if (allflag && signo==SIGALRM) {
    301 		if (allcounter >= turns){
    302 			p = curmode;
    303 			p++;
    304 			if (p->c_name == NULL)
    305 				p = modes;
    306 			switch_mode(p);
    307 			allcounter=0;
    308 		} else
    309 			allcounter++;
    310        }
    311 
    312 	sigprocmask(SIG_UNBLOCK, &set, NULL);
    313 	alarm(naptime);
    314 }
    315 
    316 void
    317 redraw(int signo)
    318 {
    319 	sigset_t set;
    320 
    321 	sigemptyset(&set);
    322 	sigaddset(&set, SIGALRM);
    323 	sigprocmask(SIG_BLOCK, &set, NULL);
    324 	wrefresh(curscr);
    325 	refresh();
    326 	sigprocmask(SIG_UNBLOCK, &set, NULL);
    327 }
    328 
    329 void
    330 die(int signo)
    331 {
    332 	move(CMDLINE, 0);
    333 	clrtoeol();
    334 	refresh();
    335 	endwin();
    336 	exit(0);
    337 }
    338 
    339 void
    340 error(const char *fmt, ...)
    341 {
    342 	va_list ap;
    343 	char buf[255];
    344 	int oy, ox;
    345 
    346 	va_start(ap, fmt);
    347 
    348 	if (wnd) {
    349 		getyx(stdscr, oy, ox);
    350 		(void) vsnprintf(buf, sizeof(buf), fmt, ap);
    351 		clrtoeol();
    352 		standout();
    353 		mvaddstr(CMDLINE, 0, buf);
    354 		standend();
    355 		move(oy, ox);
    356 		refresh();
    357 	} else {
    358 		(void) vfprintf(stderr, fmt, ap);
    359 		fprintf(stderr, "\n");
    360 	}
    361 	va_end(ap);
    362 }
    363 
    364 void
    365 nlisterr(struct nlist namelist[])
    366 {
    367 	int i, n;
    368 
    369 	n = 0;
    370 	clear();
    371 	mvprintw(2, 10, "systat: nlist: can't find following symbols:");
    372 	for (i = 0;
    373 	    namelist[i].n_name != NULL && *namelist[i].n_name != '\0'; i++)
    374 		if (namelist[i].n_value == 0)
    375 			mvprintw(2 + ++n, 10, "%s", namelist[i].n_name);
    376 	move(CMDLINE, 0);
    377 	clrtoeol();
    378 	refresh();
    379 	endwin();
    380 	exit(1);
    381 }
    382