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main.c revision 1.11 
      1 /*	$NetBSD: main.c,v 1.11 1997/07/21 07:05:03 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. 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 1.11 1997/07/21 07:05:03 mrg 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];
     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 int
     92 main(argc, argv)
     93 	int argc;
     94 	char **argv;
     95 {
     96 	int ch;
     97 	char errbuf[_POSIX2_LINE_MAX];
     98 
     99 	while ((ch = getopt(argc, argv, "M:N:w:")) != EOF)
    100 		switch(ch) {
    101 		case 'M':
    102 			memf = optarg;
    103 			break;
    104 		case 'N':
    105 			nlistf = optarg;
    106 			break;
    107 		case 'w':
    108 			if ((naptime = atoi(optarg)) <= 0)
    109 				errx(1, "interval <= 0.");
    110 			break;
    111 		case '?':
    112 		default:
    113 			usage();
    114 		}
    115 	argc -= optind;
    116 	argv += optind;
    117 	/*
    118 	 * Discard setgid privileges if not the running kernel so that bad
    119 	 * guys can't print interesting stuff from kernel memory.
    120 	 */
    121 	if (nlistf != NULL || memf != NULL)
    122 		setgid(getgid());
    123 
    124 	while (argc > 0) {
    125 		if (isdigit(argv[0][0])) {
    126 			naptime = atoi(argv[0]);
    127 			if (naptime <= 0)
    128 				naptime = 5;
    129 		} else {
    130 			struct cmdtab *p;
    131 
    132 			p = lookup(&argv[0][0]);
    133 			if (p == (struct cmdtab *)-1)
    134 				errx(1, "ambiguous request: %s", &argv[0][0]);
    135 			if (p == 0)
    136 				errx(1, "unknown request: %s", &argv[0][0]);
    137 			curcmd = p;
    138 		}
    139 		argc--, argv++;
    140 	}
    141 	kd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, errbuf);
    142 	if (kd == NULL) {
    143 		error("%s", errbuf);
    144 		exit(1);
    145 	}
    146 	if (kvm_nlist(kd, namelist)) {
    147 		nlisterr(namelist);
    148 		exit(1);
    149 	}
    150 	if (namelist[X_FIRST].n_type == 0)
    151 		errx(1, "couldn't read namelist");
    152 	signal(SIGINT, die);
    153 	signal(SIGQUIT, die);
    154 	signal(SIGTERM, die);
    155 	signal(SIGWINCH, redraw);
    156 
    157 	/*
    158 	 * Initialize display.  Load average appears in a one line
    159 	 * window of its own.  Current command's display appears in
    160 	 * an overlapping sub-window of stdscr configured by the display
    161 	 * routines to minimize update work by curses.
    162 	 */
    163 	if (initscr() == NULL)
    164 	{
    165 		warnx("couldn't initialize screen");
    166 		exit(0);
    167 	}
    168 
    169 	CMDLINE = LINES - 1;
    170 	wnd = (*curcmd->c_open)();
    171 	if (wnd == NULL) {
    172 		warnx("couldn't initialize display");
    173 		die(0);
    174 	}
    175 	wload = newwin(1, 0, 3, 20);
    176 	if (wload == NULL) {
    177 		warnx("couldn't set up load average window");
    178 		die(0);
    179 	}
    180 	gethostname(hostname, sizeof (hostname));
    181 	NREAD(X_HZ, &hz, LONG);
    182 	NREAD(X_STATHZ, &stathz, LONG);
    183 	(*curcmd->c_init)();
    184 	curcmd->c_flags |= CF_INIT;
    185 	labels();
    186 
    187 	dellave = 0.0;
    188 
    189 	signal(SIGALRM, display);
    190 	display(0);
    191 	noecho();
    192 	crmode();
    193 	keyboard();
    194 	/*NOTREACHED*/
    195 }
    196 
    197 static void
    198 usage()
    199 {
    200 	fprintf(stderr, "usage: systat [-M core] [-N system] [-w wait]\n");
    201 	exit(1);
    202 }
    203 
    204 
    205 void
    206 labels()
    207 {
    208 	if (curcmd->c_flags & CF_LOADAV) {
    209 		mvaddstr(2, 20,
    210 		    "/0   /1   /2   /3   /4   /5   /6   /7   /8   /9   /10");
    211 		mvaddstr(3, 5, "Load Average");
    212 	}
    213 	(*curcmd->c_label)();
    214 #ifdef notdef
    215 	mvprintw(21, 25, "CPU usage on %s", hostname);
    216 #endif
    217 	refresh();
    218 }
    219 
    220 void
    221 display(signo)
    222 	int signo;
    223 {
    224 	register int i, j;
    225 
    226 	/* Get the load average over the last minute. */
    227 	(void) getloadavg(avenrun, sizeof(avenrun) / sizeof(avenrun[0]));
    228 	(*curcmd->c_fetch)();
    229 	if (curcmd->c_flags & CF_LOADAV) {
    230 		j = 5.0*avenrun[0] + 0.5;
    231 		dellave -= avenrun[0];
    232 		if (dellave >= 0.0)
    233 			c = '<';
    234 		else {
    235 			c = '>';
    236 			dellave = -dellave;
    237 		}
    238 		if (dellave < 0.1)
    239 			c = '|';
    240 		dellave = avenrun[0];
    241 		wmove(wload, 0, 0); wclrtoeol(wload);
    242 		for (i = (j > 50) ? 50 : j; i > 0; i--)
    243 			waddch(wload, c);
    244 		if (j > 50)
    245 			wprintw(wload, " %4.1f", avenrun[0]);
    246 	}
    247 	(*curcmd->c_refresh)();
    248 	if (curcmd->c_flags & CF_LOADAV)
    249 		wrefresh(wload);
    250 	wrefresh(wnd);
    251 	move(CMDLINE, col);
    252 	refresh();
    253 	alarm(naptime);
    254 }
    255 
    256 void
    257 redraw(signo)
    258 	int signo;
    259 {
    260 	sigset_t set;
    261 
    262 	sigemptyset(&set);
    263 	sigaddset(&set, SIGALRM);
    264 	sigprocmask(SIG_BLOCK, &set, NULL);
    265 	wrefresh(curscr);
    266 	refresh();
    267 	sigprocmask(SIG_UNBLOCK, &set, NULL);
    268 }
    269 
    270 void
    271 load()
    272 {
    273 
    274 	(void) getloadavg(avenrun, sizeof(avenrun)/sizeof(avenrun[0]));
    275 	mvprintw(CMDLINE, 0, "%4.1f %4.1f %4.1f",
    276 	    avenrun[0], avenrun[1], avenrun[2]);
    277 	clrtoeol();
    278 }
    279 
    280 void
    281 die(signo)
    282 	int signo;
    283 {
    284 	move(CMDLINE, 0);
    285 	clrtoeol();
    286 	refresh();
    287 	endwin();
    288 	exit(0);
    289 }
    290 
    291 #if __STDC__
    292 #include <stdarg.h>
    293 #else
    294 #include <varargs.h>
    295 #endif
    296 
    297 #if __STDC__
    298 void
    299 error(const char *fmt, ...)
    300 #else
    301 void
    302 error(fmt, va_alist)
    303 	char *fmt;
    304 	va_dcl
    305 #endif
    306 {
    307 	va_list ap;
    308 	char buf[255];
    309 	int oy, ox;
    310 #if __STDC__
    311 	va_start(ap, fmt);
    312 #else
    313 	va_start(ap);
    314 #endif
    315 
    316 	if (wnd) {
    317 		getyx(stdscr, oy, ox);
    318 		(void) vsprintf(buf, fmt, ap);
    319 		clrtoeol();
    320 		standout();
    321 		mvaddstr(CMDLINE, 0, buf);
    322 		standend();
    323 		move(oy, ox);
    324 		refresh();
    325 	} else {
    326 		(void) vfprintf(stderr, fmt, ap);
    327 		fprintf(stderr, "\n");
    328 	}
    329 	va_end(ap);
    330 }
    331 
    332 void
    333 nlisterr(namelist)
    334 	struct nlist namelist[];
    335 {
    336 	int i, n;
    337 
    338 	n = 0;
    339 	clear();
    340 	mvprintw(2, 10, "systat: nlist: can't find following symbols:");
    341 	for (i = 0;
    342 	    namelist[i].n_name != NULL && *namelist[i].n_name != '\0'; i++)
    343 		if (namelist[i].n_value == 0)
    344 			mvprintw(2 + ++n, 10, "%s", namelist[i].n_name);
    345 	move(CMDLINE, 0);
    346 	clrtoeol();
    347 	refresh();
    348 	endwin();
    349 	exit(1);
    350 }
    351