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main.c revision 1.41 
      1 /*	$NetBSD: main.c,v 1.41 2007/12/31 00:22:15 christos 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. Neither the name of the University nor the names of its contributors
     16  *    may be used to endorse or promote products derived from this software
     17  *    without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29  * SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 #ifndef lint
     34 __COPYRIGHT("@(#) Copyright (c) 1980, 1992, 1993\n\
     35 	The Regents of the University of California.  All rights reserved.\n");
     36 #if 0
     37 static char sccsid[] = "@(#)main.c	8.1 (Berkeley) 6/6/93";
     38 #endif
     39 __RCSID("$NetBSD: main.c,v 1.41 2007/12/31 00:22:15 christos Exp $");
     40 #endif /* not lint */
     41 
     42 #include <sys/param.h>
     43 
     44 #include <ctype.h>
     45 #include <err.h>
     46 #include <limits.h>
     47 #include <signal.h>
     48 #include <stdarg.h>
     49 #include <stdio.h>
     50 #include <stdlib.h>
     51 #include <string.h>
     52 #include <unistd.h>
     53 #include <termios.h>
     54 #include <sys/ioctl.h>
     55 
     56 #include "systat.h"
     57 #include "extern.h"
     58 
     59 static struct nlist namelist[] = {
     60 #define X_FIRST		0
     61 #define	X_HZ		0
     62 	{ .n_name = "_hz" },
     63 #define	X_STATHZ		1
     64 	{ .n_name = "_stathz" },
     65 #define	X_MAXSLP		2
     66 	{ .n_name = "_maxslp" },
     67 	{ .n_name = NULL }
     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, maxslp;
     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 sig_atomic_t needsredraw = 0;
     89 
     90 static	WINDOW *wload;			/* one line window for load average */
     91 
     92 static void (*sv_stop_handler)(int);
     93 
     94 static void stop(int);
     95 static void usage(void);
     96 int main(int, char **);
     97 
     98 gid_t egid; /* XXX needed by initiostat() and initkre() */
     99 
    100 int
    101 main(int argc, char **argv)
    102 {
    103 	int ch;
    104 	char errbuf[_POSIX2_LINE_MAX];
    105 
    106 	egid = getegid();
    107 	(void)setegid(getgid());
    108 
    109 	while ((ch = getopt(argc, argv, "M:N:nw:t:")) != -1)
    110 		switch(ch) {
    111 		case 'M':
    112 			memf = optarg;
    113 			break;
    114 		case 'N':
    115 			nlistf = optarg;
    116 			break;
    117 		case 'n':
    118 			nflag = !nflag;
    119 			break;
    120 		case 'w':
    121 			if ((naptime = atoi(optarg)) <= 0)
    122 				errx(1, "interval <= 0.");
    123 			break;
    124 		case 't':
    125 			if ((turns = atoi(optarg)) <= 0)
    126 				errx(1, "turns <= 0.");
    127 			break;
    128 		case '?':
    129 		default:
    130 			usage();
    131 		}
    132 	argc -= optind;
    133 	argv += optind;
    134 
    135 
    136 	for ( ; argc > 0; argc--, argv++) {
    137 		struct mode *p;
    138 		int modefound = 0;
    139 
    140 		if (isdigit((unsigned char)argv[0][0])) {
    141 			naptime = atoi(argv[0]);
    142 			if (naptime <= 0)
    143 				naptime = 5;
    144 			continue;
    145 		}
    146 
    147 		for (p = modes; p->c_name ; p++) {
    148 			if (strstr(p->c_name, argv[0]) == p->c_name) {
    149 				curmode = p;
    150 				modefound++;
    151 				break;
    152 			}
    153 
    154 			if(strstr("all",argv[0]) == "all"){
    155 				allcounter=0;
    156 				allflag=1;
    157 			}
    158 		}
    159 
    160 
    161 		if (!modefound && !allflag)
    162 			error("%s: Unknown command.", argv[0]);
    163 	}
    164 
    165 	/*
    166 	 * Discard setgid privileges.  If not the running kernel, we toss
    167 	 * them away totally so that bad guys can't print interesting stuff
    168 	 * from kernel memory, otherwise switch back to kmem for the
    169 	 * duration of the kvm_openfiles() call.
    170 	 */
    171 	if (nlistf != NULL || memf != NULL)
    172 		(void)setgid(getgid());
    173 	else
    174 		(void)setegid(egid);
    175 
    176 	kd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, errbuf);
    177 	if (kd == NULL) {
    178 		error("%s", errbuf);
    179 		exit(1);
    180 	}
    181 
    182 	/* Get rid of privs for now. */
    183 	if (nlistf == NULL && memf == NULL)
    184 		(void)setegid(getgid());
    185 
    186 	if (kvm_nlist(kd, namelist)) {
    187 		if (nlistf)
    188 			errx(1, "%s: no namelist", nlistf);
    189 		else
    190 			errx(1, "no namelist");
    191 	}
    192 
    193 	signal(SIGINT, die);
    194 	signal(SIGQUIT, die);
    195 	signal(SIGTERM, die);
    196 	sv_stop_handler = signal(SIGTSTP, stop);
    197 
    198 	/*
    199 	 * Initialize display.  Load average appears in a one line
    200 	 * window of its own.  Current command's display appears in
    201 	 * an overlapping sub-window of stdscr configured by the display
    202 	 * routines to minimize update work by curses.
    203 	 */
    204 	if (initscr() == NULL)
    205 	{
    206 		warnx("couldn't initialize screen");
    207 		exit(0);
    208 	}
    209 
    210 	CMDLINE = LINES - 1;
    211 	wnd = (*curmode->c_open)();
    212 	if (wnd == NULL) {
    213 		warnx("couldn't initialize display");
    214 		die(0);
    215 	}
    216 	wload = newwin(1, 0, 3, 20);
    217 	if (wload == NULL) {
    218 		warnx("couldn't set up load average window");
    219 		die(0);
    220 	}
    221 	gethostname(hostname, sizeof (hostname));
    222 	hostname[sizeof(hostname) - 1] = '\0';
    223 	NREAD(X_HZ, &hz, sizeof hz);
    224 	NREAD(X_STATHZ, &stathz, sizeof stathz);
    225 	NREAD(X_MAXSLP, &maxslp, sizeof maxslp);
    226 	(*curmode->c_init)();
    227 	curmode->c_flags |= CF_INIT;
    228 	labels();
    229 
    230 	dellave = 0.0;
    231 
    232 	display(0);
    233 	noecho();
    234 	cbreak();
    235 	keyboard();
    236 	/*NOTREACHED*/
    237 }
    238 
    239 static void
    240 usage(void)
    241 {
    242 	fprintf(stderr, "usage: systat [-n] [-M core] [-N system] [-w wait] "
    243 		"[-t turns]\n\t\t[display] [refresh-interval]\n");
    244 	exit(1);
    245 }
    246 
    247 
    248 void
    249 labels(void)
    250 {
    251 	if (curmode->c_flags & CF_LOADAV) {
    252 		mvaddstr(2, 20,
    253 		    "/0   /1   /2   /3   /4   /5   /6   /7   /8   /9   /10");
    254 		mvaddstr(3, 5, "Load Average");
    255 	}
    256 	(*curmode->c_label)();
    257 #ifdef notdef
    258 	mvprintw(21, 25, "CPU usage on %s", hostname);
    259 #endif
    260 	refresh();
    261 }
    262 
    263 void
    264 display(int signo)
    265 {
    266 	int j;
    267 	struct mode *p;
    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 	timeout(naptime * 1000);
    310 }
    311 
    312 void
    313 redraw(void)
    314 {
    315 	resizeterm(LINES, COLS);
    316 	CMDLINE = LINES - 1;
    317 	labels();
    318 
    319 	display(0);
    320 	needsredraw = 0;
    321 }
    322 
    323 static void
    324 stop(int signo)
    325 {
    326 	sigset_t set;
    327 
    328 	signal(SIGTSTP, sv_stop_handler);
    329 	/* unblock SIGTSTP */
    330 	sigemptyset(&set);
    331 	sigaddset(&set, SIGTSTP);
    332 	sigprocmask(SIG_UNBLOCK, &set, NULL);
    333 	/* stop ourselves */
    334 	kill(0, SIGTSTP);
    335 	/* must have been restarted */
    336 	signal(SIGTSTP, stop);
    337 	needsredraw = signo;
    338 }
    339 
    340 void
    341 die(int signo)
    342 {
    343 	move(CMDLINE, 0);
    344 	clrtoeol();
    345 	refresh();
    346 	endwin();
    347 	exit(0);
    348 }
    349 
    350 void
    351 error(const char *fmt, ...)
    352 {
    353 	va_list ap;
    354 	char buf[255];
    355 	int oy, ox;
    356 
    357 	va_start(ap, fmt);
    358 
    359 	if (wnd) {
    360 		getyx(stdscr, oy, ox);
    361 		(void) vsnprintf(buf, sizeof(buf), fmt, ap);
    362 		clrtoeol();
    363 		standout();
    364 		mvaddstr(CMDLINE, 0, buf);
    365 		standend();
    366 		move(oy, ox);
    367 		refresh();
    368 	} else {
    369 		(void) vfprintf(stderr, fmt, ap);
    370 		fprintf(stderr, "\n");
    371 	}
    372 	va_end(ap);
    373 }
    374 
    375 void
    376 nlisterr(struct nlist name_list[])
    377 {
    378 	int i, n;
    379 
    380 	n = 0;
    381 	clear();
    382 	mvprintw(2, 10, "systat: nlist: can't find following symbols:");
    383 	for (i = 0;
    384 	    name_list[i].n_name != NULL && *name_list[i].n_name != '\0'; i++)
    385 		if (name_list[i].n_value == 0)
    386 			mvprintw(2 + ++n, 10, "%s", name_list[i].n_name);
    387 	move(CMDLINE, 0);
    388 	clrtoeol();
    389 	refresh();
    390 	sleep(5);
    391 	endwin();
    392 	exit(1);
    393 }
    394