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main.c revision 1.21 
      1 /*	$NetBSD: main.c,v 1.21 1999/12/20 17:08:52 jwise 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 1.21 1999/12/20 17:08:52 jwise 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 
     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 
     86 static	WINDOW *wload;			/* one line window for load average */
     87 
     88 static void usage __P((void));
     89 int main __P((int, char **));
     90 
     91 gid_t egid; /* XXX needed by initiostat() and initkre() */
     92 
     93 int
     94 main(argc, argv)
     95 	int argc;
     96 	char **argv;
     97 {
     98 	int ch;
     99 	char errbuf[_POSIX2_LINE_MAX];
    100 
    101 	egid = getegid();
    102 	(void)setegid(getgid());
    103 
    104 	while ((ch = getopt(argc, argv, "M:N:w:")) != -1)
    105 		switch(ch) {
    106 		case 'M':
    107 			memf = optarg;
    108 			break;
    109 		case 'N':
    110 			nlistf = optarg;
    111 			break;
    112 		case 'w':
    113 			if ((naptime = atoi(optarg)) <= 0)
    114 				errx(1, "interval <= 0.");
    115 			break;
    116 		case '?':
    117 		default:
    118 			usage();
    119 		}
    120 	argc -= optind;
    121 	argv += optind;
    122 
    123 
    124 	for ( ; argc > 0; argc--, argv++) {
    125 		struct mode *p;
    126 		int modefound = 0;
    127 
    128 		if (isdigit(argv[0][0])) {
    129 			naptime = atoi(argv[0]);
    130 			if (naptime <= 0)
    131 				naptime = 5;
    132 			continue;
    133 		}
    134 
    135 		for (p = modes; p->c_name ; p++) {
    136 			if (strcmp(argv[0], p->c_name) == 0) {
    137 				curmode = p;
    138 				modefound++;
    139 				break;
    140 			}
    141 		}
    142 
    143 		if (!modefound)
    144 			error("%s: Unknown command.", argv[0]);
    145 	}
    146 
    147 	/*
    148 	 * Discard setgid privileges.  If not the running kernel, we toss
    149 	 * them away totally so that bad guys can't print interesting stuff
    150 	 * from kernel memory, otherwise switch back to kmem for the
    151 	 * duration of the kvm_openfiles() call.
    152 	 */
    153 	if (nlistf != NULL || memf != NULL)
    154 		(void)setgid(getgid());
    155 	else
    156 		(void)setegid(egid);
    157 
    158 	kd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, errbuf);
    159 	if (kd == NULL) {
    160 		error("%s", errbuf);
    161 		exit(1);
    162 	}
    163 
    164 	/* Get rid of privs for now. */
    165 	if (nlistf == NULL && memf == NULL)
    166 		(void)setegid(getgid());
    167 
    168 	if (kvm_nlist(kd, namelist)) {
    169 		nlisterr(namelist);
    170 		exit(1);
    171 	}
    172 	if (namelist[X_FIRST].n_type == 0)
    173 		errx(1, "couldn't read namelist");
    174 	signal(SIGINT, die);
    175 	signal(SIGQUIT, die);
    176 	signal(SIGTERM, die);
    177 	signal(SIGWINCH, redraw);
    178 
    179 	/*
    180 	 * Initialize display.  Load average appears in a one line
    181 	 * window of its own.  Current command's display appears in
    182 	 * an overlapping sub-window of stdscr configured by the display
    183 	 * routines to minimize update work by curses.
    184 	 */
    185 	if (initscr() == NULL)
    186 	{
    187 		warnx("couldn't initialize screen");
    188 		exit(0);
    189 	}
    190 
    191 	CMDLINE = LINES - 1;
    192 	wnd = (*curmode->c_open)();
    193 	if (wnd == NULL) {
    194 		warnx("couldn't initialize display");
    195 		die(0);
    196 	}
    197 	wload = newwin(1, 0, 3, 20);
    198 	if (wload == NULL) {
    199 		warnx("couldn't set up load average window");
    200 		die(0);
    201 	}
    202 	gethostname(hostname, sizeof (hostname));
    203 	hostname[sizeof(hostname) - 1] = '\0';
    204 	NREAD(X_HZ, &hz, sizeof hz);
    205 	NREAD(X_STATHZ, &stathz, sizeof stathz);
    206 	(*curmode->c_init)();
    207 	curmode->c_flags |= CF_INIT;
    208 	labels();
    209 
    210 	dellave = 0.0;
    211 
    212 	signal(SIGALRM, display);
    213 	display(0);
    214 	noecho();
    215 	crmode();
    216 	keyboard();
    217 	/*NOTREACHED*/
    218 }
    219 
    220 static void
    221 usage()
    222 {
    223 	fprintf(stderr, "usage: systat [-M core] [-N system] [-w wait] "
    224 		"[display] [refresh-interval]\n");
    225 	exit(1);
    226 }
    227 
    228 
    229 void
    230 labels()
    231 {
    232 	if (curmode->c_flags & CF_LOADAV) {
    233 		mvaddstr(2, 20,
    234 		    "/0   /1   /2   /3   /4   /5   /6   /7   /8   /9   /10");
    235 		mvaddstr(3, 5, "Load Average");
    236 	}
    237 	(*curmode->c_label)();
    238 #ifdef notdef
    239 	mvprintw(21, 25, "CPU usage on %s", hostname);
    240 #endif
    241 	refresh();
    242 }
    243 
    244 void
    245 display(signo)
    246 	int signo;
    247 {
    248 	int i, j;
    249 
    250 	/* Get the load average over the last minute. */
    251 	(void)getloadavg(avenrun, sizeof(avenrun) / sizeof(avenrun[0]));
    252 	(*curmode->c_fetch)();
    253 	if (curmode->c_flags & CF_LOADAV) {
    254 		j = 5.0*avenrun[0] + 0.5;
    255 		dellave -= avenrun[0];
    256 		if (dellave >= 0.0)
    257 			c = '<';
    258 		else {
    259 			c = '>';
    260 			dellave = -dellave;
    261 		}
    262 		if (dellave < 0.1)
    263 			c = '|';
    264 		dellave = avenrun[0];
    265 		wmove(wload, 0, 0); wclrtoeol(wload);
    266 		for (i = (j > 50) ? 50 : j; i > 0; i--)
    267 			waddch(wload, c);
    268 		if (j > 50)
    269 			wprintw(wload, " %4.1f", avenrun[0]);
    270 	}
    271 	(*curmode->c_refresh)();
    272 	if (curmode->c_flags & CF_LOADAV)
    273 		wrefresh(wload);
    274 	wrefresh(wnd);
    275 	move(CMDLINE, col);
    276 	refresh();
    277 	alarm(naptime);
    278 }
    279 
    280 void
    281 redraw(signo)
    282 	int signo;
    283 {
    284 	sigset_t set;
    285 
    286 	sigemptyset(&set);
    287 	sigaddset(&set, SIGALRM);
    288 	sigprocmask(SIG_BLOCK, &set, NULL);
    289 	wrefresh(curscr);
    290 	refresh();
    291 	sigprocmask(SIG_UNBLOCK, &set, NULL);
    292 }
    293 
    294 void
    295 die(signo)
    296 	int signo;
    297 {
    298 	move(CMDLINE, 0);
    299 	clrtoeol();
    300 	refresh();
    301 	endwin();
    302 	exit(0);
    303 }
    304 
    305 #if __STDC__
    306 #include <stdarg.h>
    307 #else
    308 #include <varargs.h>
    309 #endif
    310 
    311 #if __STDC__
    312 void
    313 error(const char *fmt, ...)
    314 #else
    315 void
    316 error(fmt, va_alist)
    317 	char *fmt;
    318 	va_dcl
    319 #endif
    320 {
    321 	va_list ap;
    322 	char buf[255];
    323 	int oy, ox;
    324 #if __STDC__
    325 	va_start(ap, fmt);
    326 #else
    327 	va_start(ap);
    328 #endif
    329 
    330 	if (wnd) {
    331 		getyx(stdscr, oy, ox);
    332 		(void) vsnprintf(buf, sizeof(buf), fmt, ap);
    333 		clrtoeol();
    334 		standout();
    335 		mvaddstr(CMDLINE, 0, buf);
    336 		standend();
    337 		move(oy, ox);
    338 		refresh();
    339 	} else {
    340 		(void) vfprintf(stderr, fmt, ap);
    341 		fprintf(stderr, "\n");
    342 	}
    343 	va_end(ap);
    344 }
    345 
    346 void
    347 nlisterr(namelist)
    348 	struct nlist namelist[];
    349 {
    350 	int i, n;
    351 
    352 	n = 0;
    353 	clear();
    354 	mvprintw(2, 10, "systat: nlist: can't find following symbols:");
    355 	for (i = 0;
    356 	    namelist[i].n_name != NULL && *namelist[i].n_name != '\0'; i++)
    357 		if (namelist[i].n_value == 0)
    358 			mvprintw(2 + ++n, 10, "%s", namelist[i].n_name);
    359 	move(CMDLINE, 0);
    360 	clrtoeol();
    361 	refresh();
    362 	endwin();
    363 	exit(1);
    364 }
    365