Home | History | Annotate | Line # | Download | only in systat
main.c revision 1.24 
      1 /*	$NetBSD: main.c,v 1.24 2000/04/11 01:01:26 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 1.24 2000/04/11 01:01:26 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:nw:")) != -1)
    105 		switch(ch) {
    106 		case 'M':
    107 			memf = optarg;
    108 			break;
    109 		case 'N':
    110 			nlistf = optarg;
    111 			break;
    112 		case 'n':
    113 			nflag = !nflag;
    114 			break;
    115 		case 'w':
    116 			if ((naptime = atoi(optarg)) <= 0)
    117 				errx(1, "interval <= 0.");
    118 			break;
    119 		case '?':
    120 		default:
    121 			usage();
    122 		}
    123 	argc -= optind;
    124 	argv += optind;
    125 
    126 
    127 	for ( ; argc > 0; argc--, argv++) {
    128 		struct mode *p;
    129 		int modefound = 0;
    130 
    131 		if (isdigit(argv[0][0])) {
    132 			naptime = atoi(argv[0]);
    133 			if (naptime <= 0)
    134 				naptime = 5;
    135 			continue;
    136 		}
    137 
    138 		for (p = modes; p->c_name ; p++) {
    139 			if (strstr(p->c_name, argv[0]) == p->c_name) {
    140 				curmode = p;
    141 				modefound++;
    142 				break;
    143 			}
    144 		}
    145 
    146 		if (!modefound)
    147 			error("%s: Unknown command.", argv[0]);
    148 	}
    149 
    150 	/*
    151 	 * Discard setgid privileges.  If not the running kernel, we toss
    152 	 * them away totally so that bad guys can't print interesting stuff
    153 	 * from kernel memory, otherwise switch back to kmem for the
    154 	 * duration of the kvm_openfiles() call.
    155 	 */
    156 	if (nlistf != NULL || memf != NULL)
    157 		(void)setgid(getgid());
    158 	else
    159 		(void)setegid(egid);
    160 
    161 	kd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, errbuf);
    162 	if (kd == NULL) {
    163 		error("%s", errbuf);
    164 		exit(1);
    165 	}
    166 
    167 	/* Get rid of privs for now. */
    168 	if (nlistf == NULL && memf == NULL)
    169 		(void)setegid(getgid());
    170 
    171 	if (kvm_nlist(kd, namelist)) {
    172 		nlisterr(namelist);
    173 		exit(1);
    174 	}
    175 	if (namelist[X_FIRST].n_type == 0)
    176 		errx(1, "couldn't read namelist");
    177 	signal(SIGINT, die);
    178 	signal(SIGQUIT, die);
    179 	signal(SIGTERM, die);
    180 	signal(SIGWINCH, redraw);
    181 
    182 	/*
    183 	 * Initialize display.  Load average appears in a one line
    184 	 * window of its own.  Current command's display appears in
    185 	 * an overlapping sub-window of stdscr configured by the display
    186 	 * routines to minimize update work by curses.
    187 	 */
    188 	if (initscr() == NULL)
    189 	{
    190 		warnx("couldn't initialize screen");
    191 		exit(0);
    192 	}
    193 
    194 	CMDLINE = LINES - 1;
    195 	wnd = (*curmode->c_open)();
    196 	if (wnd == NULL) {
    197 		warnx("couldn't initialize display");
    198 		die(0);
    199 	}
    200 	wload = newwin(1, 0, 3, 20);
    201 	if (wload == NULL) {
    202 		warnx("couldn't set up load average window");
    203 		die(0);
    204 	}
    205 	gethostname(hostname, sizeof (hostname));
    206 	hostname[sizeof(hostname) - 1] = '\0';
    207 	NREAD(X_HZ, &hz, sizeof hz);
    208 	NREAD(X_STATHZ, &stathz, sizeof stathz);
    209 	(*curmode->c_init)();
    210 	curmode->c_flags |= CF_INIT;
    211 	labels();
    212 
    213 	dellave = 0.0;
    214 
    215 	signal(SIGALRM, display);
    216 	display(0);
    217 	noecho();
    218 	crmode();
    219 	keyboard();
    220 	/*NOTREACHED*/
    221 }
    222 
    223 static void
    224 usage()
    225 {
    226 	fprintf(stderr, "usage: systat [-n] [-M core] [-N system] [-w wait] "
    227 		"[display] [refresh-interval]\n");
    228 	exit(1);
    229 }
    230 
    231 
    232 void
    233 labels()
    234 {
    235 	if (curmode->c_flags & CF_LOADAV) {
    236 		mvaddstr(2, 20,
    237 		    "/0   /1   /2   /3   /4   /5   /6   /7   /8   /9   /10");
    238 		mvaddstr(3, 5, "Load Average");
    239 	}
    240 	(*curmode->c_label)();
    241 #ifdef notdef
    242 	mvprintw(21, 25, "CPU usage on %s", hostname);
    243 #endif
    244 	refresh();
    245 }
    246 
    247 void
    248 display(signo)
    249 	int signo;
    250 {
    251 	int i, j;
    252 	sigset_t set;
    253 
    254 	sigemptyset(&set);
    255 	sigaddset(&set, SIGALRM);
    256 	sigprocmask(SIG_BLOCK, &set, NULL);
    257 
    258 	/* Get the load average over the last minute. */
    259 	(void)getloadavg(avenrun, sizeof(avenrun) / sizeof(avenrun[0]));
    260 	(*curmode->c_fetch)();
    261 	if (curmode->c_flags & CF_LOADAV) {
    262 		j = 5.0*avenrun[0] + 0.5;
    263 		dellave -= avenrun[0];
    264 		if (dellave >= 0.0)
    265 			c = '<';
    266 		else {
    267 			c = '>';
    268 			dellave = -dellave;
    269 		}
    270 		if (dellave < 0.1)
    271 			c = '|';
    272 		dellave = avenrun[0];
    273 		wmove(wload, 0, 0); wclrtoeol(wload);
    274 		for (i = (j > 50) ? 50 : j; i > 0; i--)
    275 			waddch(wload, c);
    276 		if (j > 50)
    277 			wprintw(wload, " %4.1f", avenrun[0]);
    278 	}
    279 	(*curmode->c_refresh)();
    280 	if (curmode->c_flags & CF_LOADAV)
    281 		wrefresh(wload);
    282 	wrefresh(wnd);
    283 	move(CMDLINE, col);
    284 	refresh();
    285 	sigprocmask(SIG_UNBLOCK, &set, NULL);
    286 	alarm(naptime);
    287 }
    288 
    289 void
    290 redraw(signo)
    291 	int signo;
    292 {
    293 	sigset_t set;
    294 
    295 	sigemptyset(&set);
    296 	sigaddset(&set, SIGALRM);
    297 	sigprocmask(SIG_BLOCK, &set, NULL);
    298 	wrefresh(curscr);
    299 	refresh();
    300 	sigprocmask(SIG_UNBLOCK, &set, NULL);
    301 }
    302 
    303 void
    304 die(signo)
    305 	int signo;
    306 {
    307 	move(CMDLINE, 0);
    308 	clrtoeol();
    309 	refresh();
    310 	endwin();
    311 	exit(0);
    312 }
    313 
    314 #if __STDC__
    315 #include <stdarg.h>
    316 #else
    317 #include <varargs.h>
    318 #endif
    319 
    320 #if __STDC__
    321 void
    322 error(const char *fmt, ...)
    323 #else
    324 void
    325 error(fmt, va_alist)
    326 	char *fmt;
    327 	va_dcl
    328 #endif
    329 {
    330 	va_list ap;
    331 	char buf[255];
    332 	int oy, ox;
    333 #if __STDC__
    334 	va_start(ap, fmt);
    335 #else
    336 	va_start(ap);
    337 #endif
    338 
    339 	if (wnd) {
    340 		getyx(stdscr, oy, ox);
    341 		(void) vsnprintf(buf, sizeof(buf), fmt, ap);
    342 		clrtoeol();
    343 		standout();
    344 		mvaddstr(CMDLINE, 0, buf);
    345 		standend();
    346 		move(oy, ox);
    347 		refresh();
    348 	} else {
    349 		(void) vfprintf(stderr, fmt, ap);
    350 		fprintf(stderr, "\n");
    351 	}
    352 	va_end(ap);
    353 }
    354 
    355 void
    356 nlisterr(namelist)
    357 	struct nlist namelist[];
    358 {
    359 	int i, n;
    360 
    361 	n = 0;
    362 	clear();
    363 	mvprintw(2, 10, "systat: nlist: can't find following symbols:");
    364 	for (i = 0;
    365 	    namelist[i].n_name != NULL && *namelist[i].n_name != '\0'; i++)
    366 		if (namelist[i].n_value == 0)
    367 			mvprintw(2 + ++n, 10, "%s", namelist[i].n_name);
    368 	move(CMDLINE, 0);
    369 	clrtoeol();
    370 	refresh();
    371 	endwin();
    372 	exit(1);
    373 }
    374