main.c revision 126775 
1/*-
2 * Copyright (c) 1980, 1992, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#include <sys/cdefs.h>
35
36__FBSDID("$FreeBSD: head/usr.bin/systat/main.c 126775 2004-03-09 11:57:28Z dwmalone $");
37
38#ifdef lint
39static const char sccsid[] = "@(#)main.c	8.1 (Berkeley) 6/6/93";
40#endif
41
42#ifndef lint
43static const char copyright[] =
44"@(#) Copyright (c) 1980, 1992, 1993\n\
45	The Regents of the University of California.  All rights reserved.\n";
46#endif
47
48#include <sys/param.h>
49#include <sys/time.h>
50#include <sys/sysctl.h>
51
52#include <err.h>
53#include <limits.h>
54#include <locale.h>
55#include <nlist.h>
56#include <paths.h>
57#include <signal.h>
58#include <stdio.h>
59#include <stdlib.h>
60#include <unistd.h>
61
62#include "systat.h"
63#include "extern.h"
64
65static int     dellave;
66
67kvm_t *kd;
68sig_t	sigtstpdfl;
69double avenrun[3];
70int     col;
71int	naptime = 5;
72int     verbose = 1;                    /* to report kvm read errs */
73struct	clockinfo clkinfo;
74double	hertz;
75char    c;
76char    *namp;
77char    hostname[MAXHOSTNAMELEN];
78WINDOW  *wnd;
79int     CMDLINE;
80int     use_kvm = 1;
81
82static	WINDOW *wload;			/* one line window for load average */
83
84int
85main(int argc, char **argv)
86{
87	char errbuf[_POSIX2_LINE_MAX], dummy;
88	size_t	size;
89
90	(void) setlocale(LC_TIME, "");
91
92	argc--, argv++;
93	while (argc > 0) {
94		if (argv[0][0] == '-') {
95			struct cmdtab *p;
96
97			p = lookup(&argv[0][1]);
98			if (p == (struct cmdtab *)-1)
99				errx(1, "%s: ambiguous request", &argv[0][1]);
100			if (p == (struct cmdtab *)0)
101				errx(1, "%s: unknown request", &argv[0][1]);
102			curcmd = p;
103		} else {
104			naptime = atoi(argv[0]);
105			if (naptime <= 0)
106				naptime = 5;
107		}
108		argc--, argv++;
109	}
110	kd = kvm_openfiles(NULL, NULL, NULL, O_RDONLY, errbuf);
111	if (kd != NULL) {
112		/*
113		 * Try to actually read something, we may be in a jail, and
114		 * have /dev/null opened as /dev/mem.
115		 */
116		if (kvm_nlist(kd, namelist) != 0 || namelist[0].n_value == 0 ||
117		    kvm_read(kd, namelist[0].n_value, &dummy, sizeof(dummy)) !=
118		    sizeof(dummy)) {
119			kvm_close(kd);
120			kd = NULL;
121		}
122	}
123	if (kd == NULL) {
124		/*
125		 * Maybe we are lacking permissions? Retry, this time with bogus
126		 * devices. We can now use sysctl only.
127		 */
128		use_kvm = 0;
129		kd = kvm_openfiles("/dev/null", "/dev/null", "/dev/null",
130		    O_RDONLY, errbuf);
131		if (kd == NULL) {
132			error("%s", errbuf);
133			exit(1);
134		}
135	}
136	signal(SIGINT, die);
137	signal(SIGQUIT, die);
138	signal(SIGTERM, die);
139
140	/*
141	 * Initialize display.  Load average appears in a one line
142	 * window of its own.  Current command's display appears in
143	 * an overlapping sub-window of stdscr configured by the display
144	 * routines to minimize update work by curses.
145	 */
146	initscr();
147	CMDLINE = LINES - 1;
148	wnd = (*curcmd->c_open)();
149	if (wnd == NULL) {
150		warnx("couldn't initialize display");
151		die(0);
152	}
153	wload = newwin(1, 0, 3, 20);
154	if (wload == NULL) {
155		warnx("couldn't set up load average window");
156		die(0);
157	}
158	gethostname(hostname, sizeof (hostname));
159	size = sizeof(clkinfo);
160	if (sysctlbyname("kern.clockrate", &clkinfo, &size, NULL, 0)
161	    || size != sizeof(clkinfo)) {
162		error("kern.clockrate");
163		die(0);
164	}
165	hertz = clkinfo.stathz;
166	(*curcmd->c_init)();
167	curcmd->c_flags |= CF_INIT;
168	labels();
169
170	dellave = 0.0;
171
172	signal(SIGALRM, display);
173	display(0);
174	noecho();
175	crmode();
176	keyboard();
177	/*NOTREACHED*/
178
179	return EXIT_SUCCESS;
180}
181
182void
183labels()
184{
185	if (curcmd->c_flags & CF_LOADAV) {
186		mvaddstr(2, 20,
187		    "/0   /1   /2   /3   /4   /5   /6   /7   /8   /9   /10");
188		mvaddstr(3, 5, "Load Average");
189	}
190	(*curcmd->c_label)();
191#ifdef notdef
192	mvprintw(21, 25, "CPU usage on %s", hostname);
193#endif
194	refresh();
195}
196
197void
198display(signo)
199	int signo __unused;
200{
201	int i, j;
202
203	/* Get the load average over the last minute. */
204	(void) getloadavg(avenrun, sizeof(avenrun) / sizeof(avenrun[0]));
205	(*curcmd->c_fetch)();
206	if (curcmd->c_flags & CF_LOADAV) {
207		j = 5.0*avenrun[0] + 0.5;
208		dellave -= avenrun[0];
209		if (dellave >= 0.0)
210			c = '<';
211		else {
212			c = '>';
213			dellave = -dellave;
214		}
215		if (dellave < 0.1)
216			c = '|';
217		dellave = avenrun[0];
218		wmove(wload, 0, 0); wclrtoeol(wload);
219		for (i = (j > 50) ? 50 : j; i > 0; i--)
220			waddch(wload, c);
221		if (j > 50)
222			wprintw(wload, " %4.1f", avenrun[0]);
223	}
224	(*curcmd->c_refresh)();
225	if (curcmd->c_flags & CF_LOADAV)
226		wrefresh(wload);
227	wrefresh(wnd);
228	move(CMDLINE, col);
229	refresh();
230	alarm(naptime);
231}
232
233void
234load()
235{
236
237	(void) getloadavg(avenrun, sizeof(avenrun)/sizeof(avenrun[0]));
238	mvprintw(CMDLINE, 0, "%4.1f %4.1f %4.1f",
239	    avenrun[0], avenrun[1], avenrun[2]);
240	clrtoeol();
241}
242
243void
244die(signo)
245	int signo __unused;
246{
247	move(CMDLINE, 0);
248	clrtoeol();
249	refresh();
250	endwin();
251	exit(0);
252}
253
254#include <stdarg.h>
255
256void
257error(const char *fmt, ...)
258{
259	va_list ap;
260	char buf[255];
261	int oy, ox;
262
263	va_start(ap, fmt);
264	if (wnd) {
265		getyx(stdscr, oy, ox);
266		(void) vsnprintf(buf, sizeof(buf), fmt, ap);
267		clrtoeol();
268		standout();
269		mvaddstr(CMDLINE, 0, buf);
270		standend();
271		move(oy, ox);
272		refresh();
273	} else {
274		(void) vfprintf(stderr, fmt, ap);
275		fprintf(stderr, "\n");
276	}
277	va_end(ap);
278}
279
280void
281nlisterr(n_list)
282	struct nlist n_list[];
283{
284	int i, n;
285
286	n = 0;
287	clear();
288	mvprintw(2, 10, "systat: nlist: can't find following symbols:");
289	for (i = 0;
290	    n_list[i].n_name != NULL && *n_list[i].n_name != '\0'; i++)
291		if (n_list[i].n_value == 0)
292			mvprintw(2 + ++n, 10, "%s", n_list[i].n_name);
293	move(CMDLINE, 0);
294	clrtoeol();
295	refresh();
296	endwin();
297	exit(1);
298}
299