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main.c revision 1.28 
      1 /*	$NetBSD: main.c,v 1.28 2000/12/01 02:19:44 simonb 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 1.28 2000/12/01 02:19:44 simonb 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 	{ "" }
     68 };
     69 static int     dellave;
     70 
     71 kvm_t *kd;
     72 char	*memf = NULL;
     73 char	*nlistf = NULL;
     74 sig_t	sigtstpdfl;
     75 double avenrun[3];
     76 int     col;
     77 int	naptime = 5;
     78 int     verbose = 1;                    /* to report kvm read errs */
     79 int     hz, stathz;
     80 char    c;
     81 char    *namp;
     82 char    hostname[MAXHOSTNAMELEN + 1];
     83 WINDOW  *wnd;
     84 int     CMDLINE;
     85 int     turns = 2;	/* stay how many refresh-turns in 'all' mode? */
     86 int     allflag;
     87 int     allcounter;
     88 
     89 static	WINDOW *wload;			/* one line window for load average */
     90 
     91 static void usage(void);
     92 int main(int, char **);
     93 
     94 gid_t egid; /* XXX needed by initiostat() and initkre() */
     95 
     96 int
     97 main(int argc, char **argv)
     98 {
     99 	int ch;
    100 	char errbuf[_POSIX2_LINE_MAX];
    101 
    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 = atoi(optarg)) <= 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 '?':
    125 		default:
    126 			usage();
    127 		}
    128 	argc -= optind;
    129 	argv += optind;
    130 
    131 
    132 	for ( ; argc > 0; argc--, argv++) {
    133 		struct mode *p;
    134 		int modefound = 0;
    135 
    136 		if (isdigit(argv[0][0])) {
    137 			naptime = atoi(argv[0]);
    138 			if (naptime <= 0)
    139 				naptime = 5;
    140 			continue;
    141 		}
    142 
    143 		for (p = modes; p->c_name ; p++) {
    144 			if (strstr(p->c_name, argv[0]) == p->c_name) {
    145 				curmode = p;
    146 				modefound++;
    147 				break;
    148 			}
    149 
    150 			if(strstr("all",argv[0]) == "all"){
    151 				allcounter=0;
    152 				allflag=1;
    153 			}
    154 		}
    155 
    156 
    157 		if (!modefound && !allflag)
    158 			error("%s: Unknown command.", argv[0]);
    159 	}
    160 
    161 	/*
    162 	 * Discard setgid privileges.  If not the running kernel, we toss
    163 	 * them away totally so that bad guys can't print interesting stuff
    164 	 * from kernel memory, otherwise switch back to kmem for the
    165 	 * duration of the kvm_openfiles() call.
    166 	 */
    167 	if (nlistf != NULL || memf != NULL)
    168 		(void)setgid(getgid());
    169 	else
    170 		(void)setegid(egid);
    171 
    172 	kd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, errbuf);
    173 	if (kd == NULL) {
    174 		error("%s", errbuf);
    175 		exit(1);
    176 	}
    177 
    178 	/* Get rid of privs for now. */
    179 	if (nlistf == NULL && memf == NULL)
    180 		(void)setegid(getgid());
    181 
    182 	if (kvm_nlist(kd, namelist)) {
    183 		nlisterr(namelist);
    184 		exit(1);
    185 	}
    186 	if (namelist[X_FIRST].n_type == 0)
    187 		errx(1, "couldn't read namelist");
    188 	signal(SIGINT, die);
    189 	signal(SIGQUIT, die);
    190 	signal(SIGTERM, die);
    191 	signal(SIGWINCH, redraw);
    192 
    193 	/*
    194 	 * Initialize display.  Load average appears in a one line
    195 	 * window of its own.  Current command's display appears in
    196 	 * an overlapping sub-window of stdscr configured by the display
    197 	 * routines to minimize update work by curses.
    198 	 */
    199 	if (initscr() == NULL)
    200 	{
    201 		warnx("couldn't initialize screen");
    202 		exit(0);
    203 	}
    204 
    205 	CMDLINE = LINES - 1;
    206 	wnd = (*curmode->c_open)();
    207 	if (wnd == NULL) {
    208 		warnx("couldn't initialize display");
    209 		die(0);
    210 	}
    211 	wload = newwin(1, 0, 3, 20);
    212 	if (wload == NULL) {
    213 		warnx("couldn't set up load average window");
    214 		die(0);
    215 	}
    216 	gethostname(hostname, sizeof (hostname));
    217 	hostname[sizeof(hostname) - 1] = '\0';
    218 	NREAD(X_HZ, &hz, sizeof hz);
    219 	NREAD(X_STATHZ, &stathz, sizeof stathz);
    220 	(*curmode->c_init)();
    221 	curmode->c_flags |= CF_INIT;
    222 	labels();
    223 
    224 	dellave = 0.0;
    225 
    226 	signal(SIGALRM, display);
    227 	display(0);
    228 	noecho();
    229 	crmode();
    230 	keyboard();
    231 	/*NOTREACHED*/
    232 }
    233 
    234 static void
    235 usage(void)
    236 {
    237 	fprintf(stderr, "usage: systat [-n] [-M core] [-N system] [-w wait] "
    238 		"[-t turns]\n\t\t[display] [refresh-interval]\n");
    239 	exit(1);
    240 }
    241 
    242 
    243 void
    244 labels(void)
    245 {
    246 	if (curmode->c_flags & CF_LOADAV) {
    247 		mvaddstr(2, 20,
    248 		    "/0   /1   /2   /3   /4   /5   /6   /7   /8   /9   /10");
    249 		mvaddstr(3, 5, "Load Average");
    250 	}
    251 	(*curmode->c_label)();
    252 #ifdef notdef
    253 	mvprintw(21, 25, "CPU usage on %s", hostname);
    254 #endif
    255 	refresh();
    256 }
    257 
    258 void
    259 display(int signo)
    260 {
    261 	int j;
    262 	sigset_t set;
    263 	struct mode *p;
    264 
    265 	sigemptyset(&set);
    266 	sigaddset(&set, SIGALRM);
    267 	sigprocmask(SIG_BLOCK, &set, NULL);
    268 
    269 	/* Get the load average over the last minute. */
    270 	(void)getloadavg(avenrun, sizeof(avenrun) / sizeof(avenrun[0]));
    271 	(*curmode->c_fetch)();
    272 	if (curmode->c_flags & CF_LOADAV) {
    273 		j = 5.0*avenrun[0] + 0.5;
    274 		dellave -= avenrun[0];
    275 		if (dellave >= 0.0)
    276 			c = '<';
    277 		else {
    278 			c = '>';
    279 			dellave = -dellave;
    280 		}
    281 		if (dellave < 0.1)
    282 			c = '|';
    283 		dellave = avenrun[0];
    284 		wmove(wload, 0, 0);
    285 		wclrtoeol(wload);
    286 		whline(wload, c, (j > 50) ? 50 : j);
    287 		if (j > 50)
    288 			wprintw(wload, " %4.1f", avenrun[0]);
    289 	}
    290 	(*curmode->c_refresh)();
    291 	if (curmode->c_flags & CF_LOADAV)
    292 		wrefresh(wload);
    293 	wrefresh(wnd);
    294 	move(CMDLINE, col);
    295 	refresh();
    296 
    297 	if (allflag && signo==SIGALRM) {
    298 		if (allcounter >= turns){
    299 			p = curmode;
    300 			p++;
    301 			if (p->c_name == NULL)
    302 				p = modes;
    303 			switch_mode(p);
    304 			allcounter=0;
    305 		} else
    306 			allcounter++;
    307        }
    308 
    309 	sigprocmask(SIG_UNBLOCK, &set, NULL);
    310 	alarm(naptime);
    311 }
    312 
    313 void
    314 redraw(int signo)
    315 {
    316 	sigset_t set;
    317 
    318 	sigemptyset(&set);
    319 	sigaddset(&set, SIGALRM);
    320 	sigprocmask(SIG_BLOCK, &set, NULL);
    321 	wrefresh(curscr);
    322 	refresh();
    323 	sigprocmask(SIG_UNBLOCK, &set, NULL);
    324 }
    325 
    326 void
    327 die(int signo)
    328 {
    329 	move(CMDLINE, 0);
    330 	clrtoeol();
    331 	refresh();
    332 	endwin();
    333 	exit(0);
    334 }
    335 
    336 void
    337 error(const char *fmt, ...)
    338 {
    339 	va_list ap;
    340 	char buf[255];
    341 	int oy, ox;
    342 
    343 	va_start(ap, fmt);
    344 
    345 	if (wnd) {
    346 		getyx(stdscr, oy, ox);
    347 		(void) vsnprintf(buf, sizeof(buf), fmt, ap);
    348 		clrtoeol();
    349 		standout();
    350 		mvaddstr(CMDLINE, 0, buf);
    351 		standend();
    352 		move(oy, ox);
    353 		refresh();
    354 	} else {
    355 		(void) vfprintf(stderr, fmt, ap);
    356 		fprintf(stderr, "\n");
    357 	}
    358 	va_end(ap);
    359 }
    360 
    361 void
    362 nlisterr(struct nlist namelist[])
    363 {
    364 	int i, n;
    365 
    366 	n = 0;
    367 	clear();
    368 	mvprintw(2, 10, "systat: nlist: can't find following symbols:");
    369 	for (i = 0;
    370 	    namelist[i].n_name != NULL && *namelist[i].n_name != '\0'; i++)
    371 		if (namelist[i].n_value == 0)
    372 			mvprintw(2 + ++n, 10, "%s", namelist[i].n_name);
    373 	move(CMDLINE, 0);
    374 	clrtoeol();
    375 	refresh();
    376 	endwin();
    377 	exit(1);
    378 }
    379