Home | History | Annotate | Line # | Download | only in systat
main.c revision 1.49 
      1 /*	$NetBSD: main.c,v 1.49 2015/08/23 18:33:15 mrg 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\
     35  The Regents of the University of California.  All rights reserved.");
     36 #if 0
     37 static char sccsid[] = "@(#)main.c	8.1 (Berkeley) 6/6/93";
     38 #endif
     39 __RCSID("$NetBSD: main.c,v 1.49 2015/08/23 18:33:15 mrg Exp $");
     40 #endif /* not lint */
     41 
     42 #include <sys/param.h>
     43 #include <sys/sysctl.h>
     44 #include <sys/ioctl.h>
     45 
     46 #include <ctype.h>
     47 #include <err.h>
     48 #include <errno.h>
     49 #include <limits.h>
     50 #include <signal.h>
     51 #include <stdarg.h>
     52 #include <stdio.h>
     53 #include <stdlib.h>
     54 #include <string.h>
     55 #include <unistd.h>
     56 #include <termios.h>
     57 
     58 #include "systat.h"
     59 #include "extern.h"
     60 
     61 static int     dellave;
     62 
     63 kvm_t *kd;
     64 char	*memf = NULL;
     65 char	*nlistf = NULL;
     66 sig_t	sigtstpdfl;
     67 double avenrun[3];
     68 int     col;
     69 int	naptime = 5;
     70 int     verbose = 1;                    /* to report kvm read errs */
     71 int     hz, stathz, maxslp;
     72 char    c;
     73 char    *namp;
     74 char    hostname[MAXHOSTNAMELEN + 1];
     75 WINDOW  *wnd;
     76 int     CMDLINE;
     77 int     turns = 2;	/* stay how many refresh-turns in 'all' mode? */
     78 int     allflag;
     79 int     allcounter;
     80 sig_atomic_t needsredraw = 0;
     81 
     82 static	WINDOW *wload;			/* one line window for load average */
     83 
     84 static void (*sv_stop_handler)(int);
     85 
     86 static void stop(int);
     87 __dead static void usage(void);
     88 
     89 gid_t egid; /* XXX needed by initiostat() and initkre() */
     90 
     91 int
     92 main(int argc, char **argv)
     93 {
     94 	int ch;
     95 	char errbuf[_POSIX2_LINE_MAX];
     96 	const char *all;
     97 	struct clockinfo clk;
     98 	size_t len;
     99 
    100 	all = "all";
    101 	egid = getegid();
    102 	(void)setegid(getgid());
    103 
    104 	while ((ch = getopt(argc, argv, "M:N:nw:t:")) != -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 't':
    120 			if ((turns = atoi(optarg)) <= 0)
    121 				errx(1, "turns <= 0.");
    122 			break;
    123 		case '?':
    124 		default:
    125 			usage();
    126 		}
    127 	argc -= optind;
    128 	argv += optind;
    129 
    130 
    131 	for ( ; argc > 0; argc--, argv++) {
    132 		struct mode *p;
    133 		int modefound = 0;
    134 
    135 		if (isdigit((unsigned char)argv[0][0])) {
    136 			naptime = atoi(argv[0]);
    137 			if (naptime <= 0)
    138 				naptime = 5;
    139 			continue;
    140 		}
    141 
    142 		for (p = modes; p->c_name ; p++) {
    143 			if (strstr(p->c_name, argv[0]) == p->c_name) {
    144 				curmode = p;
    145 				modefound++;
    146 				break;
    147 			}
    148 
    149 			if (strstr(all, argv[0]) == all) {
    150 				allcounter=0;
    151 				allflag=1;
    152 			}
    153 		}
    154 
    155 
    156 		if (!modefound && !allflag)
    157 			error("%s: Unknown command.", argv[0]);
    158 	}
    159 
    160 	/*
    161 	 * Discard setgid privileges.  If not the running kernel, we toss
    162 	 * them away totally so that bad guys can't print interesting stuff
    163 	 * from kernel memory, otherwise switch back to kmem for the
    164 	 * duration of the kvm_openfiles() call.
    165 	 */
    166 	if (nlistf != NULL || memf != NULL)
    167 		(void)setgid(getgid());
    168 	else
    169 		(void)setegid(egid);
    170 
    171 	kd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, errbuf);
    172 	if (kd == NULL) {
    173 		error("%s", errbuf);
    174 		exit(1);
    175 	}
    176 
    177 	/* Get rid of privs for now. */
    178 	if (nlistf == NULL && memf == NULL)
    179 		(void)setegid(getgid());
    180 
    181 	signal(SIGINT, die);
    182 	signal(SIGQUIT, die);
    183 	signal(SIGTERM, die);
    184 	sv_stop_handler = signal(SIGTSTP, stop);
    185 
    186 	/*
    187 	 * Initialize display.  Load average appears in a one line
    188 	 * window of its own.  Current command's display appears in
    189 	 * an overlapping sub-window of stdscr configured by the display
    190 	 * routines to minimize update work by curses.
    191 	 */
    192 	if (initscr() == NULL)
    193 	{
    194 		warnx("couldn't initialize screen");
    195 		exit(0);
    196 	}
    197 
    198 	CMDLINE = LINES - 1;
    199 	wnd = (*curmode->c_open)();
    200 	if (wnd == NULL) {
    201 		warnx("couldn't initialize display");
    202 		die(0);
    203 	}
    204 	wload = newwin(1, 0, 3, 20);
    205 	if (wload == NULL) {
    206 		warnx("couldn't set up load average window");
    207 		die(0);
    208 	}
    209 	gethostname(hostname, sizeof (hostname));
    210 	hostname[sizeof(hostname) - 1] = '\0';
    211 
    212 	len = sizeof(clk);
    213 	if (sysctlbyname("kern.clockrate", &clk, &len, NULL, 0))
    214 		error("can't get \"kern.clockrate\": %s", strerror(errno));
    215 	hz = clk.hz;
    216 	stathz = clk.stathz;
    217 
    218 	len = sizeof(maxslp);
    219 	if (sysctlbyname("vm.maxslp", &maxslp, &len, NULL, 0))
    220 		error("can't get \"vm.maxslp\": %s", strerror(errno));
    221 
    222 	(*curmode->c_init)();
    223 	curmode->c_flags |= CF_INIT;
    224 	labels();
    225 
    226 	dellave = 0.0;
    227 
    228 	display(0);
    229 	noecho();
    230 	cbreak();
    231 	keyboard();
    232 	/*NOTREACHED*/
    233 }
    234 
    235 static void
    236 usage(void)
    237 {
    238 	fprintf(stderr, "usage: systat [-n] [-M core] [-N system] [-w wait] "
    239 		"[-t turns]\n\t\t[display] [refresh-interval]\n");
    240 	exit(1);
    241 }
    242 
    243 
    244 void
    245 labels(void)
    246 {
    247 	if (curmode->c_flags & CF_LOADAV) {
    248 		mvaddstr(2, 20,
    249 		    "/0   /1   /2   /3   /4   /5   /6   /7   /8   /9   /10");
    250 		mvaddstr(3, 5, "Load Average");
    251 	}
    252 	(*curmode->c_label)();
    253 #ifdef notdef
    254 	mvprintw(21, 25, "CPU usage on %s", hostname);
    255 #endif
    256 	refresh();
    257 }
    258 
    259 void
    260 display(int signo)
    261 {
    262 	static int skip;
    263 	int j;
    264 	struct mode *p;
    265 	int ms_delay;
    266 
    267 	if (signo == SIGALRM && skip-- > 0)
    268 		/* Don't display on this timeout */
    269 		return;
    270 
    271 	/* Get the load average over the last minute. */
    272 	(void)getloadavg(avenrun, sizeof(avenrun) / sizeof(avenrun[0]));
    273 	(*curmode->c_fetch)();
    274 	if (curmode->c_flags & CF_LOADAV) {
    275 		j = 5.0*avenrun[0] + 0.5;
    276 		dellave -= avenrun[0];
    277 		if (dellave >= 0.0)
    278 			c = '<';
    279 		else {
    280 			c = '>';
    281 			dellave = -dellave;
    282 		}
    283 		if (dellave < 0.1)
    284 			c = '|';
    285 		dellave = avenrun[0];
    286 		wmove(wload, 0, 0);
    287 		wclrtoeol(wload);
    288 		whline(wload, c, (j > 50) ? 50 : j);
    289 		if (j > 50)
    290 			wprintw(wload, " %4.1f", avenrun[0]);
    291 	}
    292 	(*curmode->c_refresh)();
    293 	if (curmode->c_flags & CF_LOADAV)
    294 		wrefresh(wload);
    295 	wrefresh(wnd);
    296 	move(CMDLINE, col);
    297 	refresh();
    298 
    299 	if (allflag && signo==SIGALRM) {
    300 		if (allcounter >= turns){
    301 			p = curmode;
    302 			p++;
    303 			if (p->c_name == NULL)
    304 				p = modes;
    305 			switch_mode(p);
    306 			allcounter=0;
    307 		} else
    308 			allcounter++;
    309 	}
    310 
    311 	/* curses timeout() uses VTIME, limited to 255 1/10th secs */
    312 	ms_delay = naptime * 1000;
    313 	if (ms_delay < 25500) {
    314 		timeout(ms_delay);
    315 		skip = 0;
    316 	} else {
    317 		skip = ms_delay / 25500;
    318 		timeout(ms_delay / (skip + 1));
    319 	}
    320 }
    321 
    322 void
    323 redraw(void)
    324 {
    325 	resizeterm(LINES, COLS);
    326 	CMDLINE = LINES - 1;
    327 	labels();
    328 
    329 	display(0);
    330 	needsredraw = 0;
    331 }
    332 
    333 static void
    334 stop(int signo)
    335 {
    336 	sigset_t set;
    337 
    338 	signal(SIGTSTP, sv_stop_handler);
    339 	/* unblock SIGTSTP */
    340 	sigemptyset(&set);
    341 	sigaddset(&set, SIGTSTP);
    342 	sigprocmask(SIG_UNBLOCK, &set, NULL);
    343 	/* stop ourselves */
    344 	kill(0, SIGTSTP);
    345 	/* must have been restarted */
    346 	signal(SIGTSTP, stop);
    347 	needsredraw = signo;
    348 }
    349 
    350 void
    351 die(int signo)
    352 {
    353 	move(CMDLINE, 0);
    354 	clrtoeol();
    355 	refresh();
    356 	endwin();
    357 	exit(0);
    358 }
    359 
    360 void
    361 error(const char *fmt, ...)
    362 {
    363 	va_list ap;
    364 	char buf[255];
    365 	int oy, ox;
    366 
    367 	va_start(ap, fmt);
    368 
    369 	if (wnd) {
    370 		getyx(stdscr, oy, ox);
    371 		(void) vsnprintf(buf, sizeof(buf), fmt, ap);
    372 		clrtoeol();
    373 		standout();
    374 		mvaddstr(CMDLINE, 0, buf);
    375 		standend();
    376 		move(oy, ox);
    377 		refresh();
    378 	} else {
    379 		(void) vfprintf(stderr, fmt, ap);
    380 		fprintf(stderr, "\n");
    381 	}
    382 	va_end(ap);
    383 }
    384 
    385 void
    386 clearerror(void)
    387 {
    388 
    389 	error("%s", "");
    390 }
    391 
    392 void
    393 nlisterr(struct nlist name_list[])
    394 {
    395 	int i, n;
    396 
    397 	n = 0;
    398 	clear();
    399 	mvprintw(2, 10, "systat: nlist: can't find following symbols:");
    400 	for (i = 0;
    401 	    name_list[i].n_name != NULL && *name_list[i].n_name != '\0'; i++)
    402 		if (name_list[i].n_value == 0)
    403 			mvprintw(2 + ++n, 10, "%s", name_list[i].n_name);
    404 	move(CMDLINE, 0);
    405 	clrtoeol();
    406 	refresh();
    407 	sleep(5);
    408 	endwin();
    409 	exit(1);
    410 }
    411