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 * 4. Neither the name of the University nor the names of its contributors
14 *    may be used to endorse or promote products derived from this software
15 *    without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#include <sys/cdefs.h>
31
32__FBSDID("$FreeBSD$");
33
34#ifdef lint
35static const char sccsid[] = "@(#)main.c	8.1 (Berkeley) 6/6/93";
36#endif
37
38#ifndef lint
39static const char copyright[] =
40"@(#) Copyright (c) 1980, 1992, 1993\n\
41	The Regents of the University of California.  All rights reserved.\n";
42#endif
43
44#include <sys/param.h>
45#include <sys/time.h>
46#include <sys/sysctl.h>
47
48#include <err.h>
49#include <limits.h>
50#include <locale.h>
51#include <nlist.h>
52#include <paths.h>
53#include <signal.h>
54#include <stdio.h>
55#include <stdlib.h>
56#include <unistd.h>
57
58#include "systat.h"
59#include "extern.h"
60
61static int     dellave;
62
63kvm_t *kd;
64sig_t	sigtstpdfl;
65double avenrun[3];
66int     col;
67unsigned int	delay = 5000000;	/* in microseconds */
68int     verbose = 1;                    /* to report kvm read errs */
69struct	clockinfo clkinfo;
70double	hertz;
71char    c;
72char    *namp;
73char    hostname[MAXHOSTNAMELEN];
74WINDOW  *wnd;
75int     CMDLINE;
76int     use_kvm = 1;
77
78static	WINDOW *wload;			/* one line window for load average */
79
80int
81main(int argc, char **argv)
82{
83	char errbuf[_POSIX2_LINE_MAX], dummy;
84	size_t	size;
85	double t;
86
87	(void) setlocale(LC_ALL, "");
88
89	argc--, argv++;
90	while (argc > 0) {
91		if (argv[0][0] == '-') {
92			struct cmdtab *p;
93
94			p = lookup(&argv[0][1]);
95			if (p == (struct cmdtab *)-1)
96				errx(1, "%s: ambiguous request", &argv[0][1]);
97			if (p == (struct cmdtab *)0)
98				errx(1, "%s: unknown request", &argv[0][1]);
99			curcmd = p;
100		} else {
101			t = strtod(argv[0], NULL) * 1000000.0;
102			if (t > 0 && t < (double)UINT_MAX)
103				delay = (unsigned int)t;
104		}
105		argc--, argv++;
106	}
107	kd = kvm_openfiles(NULL, NULL, NULL, O_RDONLY, errbuf);
108	if (kd != NULL) {
109		/*
110		 * Try to actually read something, we may be in a jail, and
111		 * have /dev/null opened as /dev/mem.
112		 */
113		if (kvm_nlist(kd, namelist) != 0 || namelist[0].n_value == 0 ||
114		    kvm_read(kd, namelist[0].n_value, &dummy, sizeof(dummy)) !=
115		    sizeof(dummy)) {
116			kvm_close(kd);
117			kd = NULL;
118		}
119	}
120	if (kd == NULL) {
121		/*
122		 * Maybe we are lacking permissions? Retry, this time with bogus
123		 * devices. We can now use sysctl only.
124		 */
125		use_kvm = 0;
126		kd = kvm_openfiles("/dev/null", "/dev/null", "/dev/null",
127		    O_RDONLY, errbuf);
128		if (kd == NULL) {
129			error("%s", errbuf);
130			exit(1);
131		}
132	}
133	signal(SIGHUP, die);
134	signal(SIGINT, die);
135	signal(SIGQUIT, die);
136	signal(SIGTERM, die);
137
138	/*
139	 * Initialize display.  Load average appears in a one line
140	 * window of its own.  Current command's display appears in
141	 * an overlapping sub-window of stdscr configured by the display
142	 * routines to minimize update work by curses.
143	 */
144	initscr();
145	CMDLINE = LINES - 1;
146	wnd = (*curcmd->c_open)();
147	if (wnd == NULL) {
148		warnx("couldn't initialize display");
149		die(0);
150	}
151	wload = newwin(1, 0, 1, 20);
152	if (wload == NULL) {
153		warnx("couldn't set up load average window");
154		die(0);
155	}
156	gethostname(hostname, sizeof (hostname));
157	size = sizeof(clkinfo);
158	if (sysctlbyname("kern.clockrate", &clkinfo, &size, NULL, 0)
159	    || size != sizeof(clkinfo)) {
160		error("kern.clockrate");
161		die(0);
162	}
163	hertz = clkinfo.stathz;
164	(*curcmd->c_init)();
165	curcmd->c_flags |= CF_INIT;
166	labels();
167
168	dellave = 0.0;
169
170	display();
171	noecho();
172	crmode();
173	keyboard();
174	/*NOTREACHED*/
175
176	return EXIT_SUCCESS;
177}
178
179void
180labels(void)
181{
182	if (curcmd->c_flags & CF_LOADAV) {
183		mvaddstr(0, 20,
184		    "/0   /1   /2   /3   /4   /5   /6   /7   /8   /9   /10");
185		mvaddstr(1, 5, "Load Average");
186	}
187	(*curcmd->c_label)();
188#ifdef notdef
189	mvprintw(21, 25, "CPU usage on %s", hostname);
190#endif
191	refresh();
192}
193
194void
195display(void)
196{
197	int i, j;
198
199	/* Get the load average over the last minute. */
200	(void) getloadavg(avenrun, sizeof(avenrun) / sizeof(avenrun[0]));
201	(*curcmd->c_fetch)();
202	if (curcmd->c_flags & CF_LOADAV) {
203		j = 5.0*avenrun[0] + 0.5;
204		dellave -= avenrun[0];
205		if (dellave >= 0.0)
206			c = '<';
207		else {
208			c = '>';
209			dellave = -dellave;
210		}
211		if (dellave < 0.1)
212			c = '|';
213		dellave = avenrun[0];
214		wmove(wload, 0, 0); wclrtoeol(wload);
215		for (i = (j > 50) ? 50 : j; i > 0; i--)
216			waddch(wload, c);
217		if (j > 50)
218			wprintw(wload, " %4.1f", avenrun[0]);
219	}
220	(*curcmd->c_refresh)();
221	if (curcmd->c_flags & CF_LOADAV)
222		wrefresh(wload);
223	wrefresh(wnd);
224	move(CMDLINE, col);
225	refresh();
226}
227
228void
229load(void)
230{
231
232	(void) getloadavg(avenrun, sizeof(avenrun)/sizeof(avenrun[0]));
233	mvprintw(CMDLINE, 0, "%4.1f %4.1f %4.1f",
234	    avenrun[0], avenrun[1], avenrun[2]);
235	clrtoeol();
236}
237
238void
239die(int signo __unused)
240{
241	move(CMDLINE, 0);
242	clrtoeol();
243	refresh();
244	endwin();
245	exit(0);
246}
247
248#include <stdarg.h>
249
250void
251error(const char *fmt, ...)
252{
253	va_list ap;
254	char buf[255];
255	int oy, ox;
256
257	va_start(ap, fmt);
258	if (wnd) {
259		getyx(stdscr, oy, ox);
260		(void) vsnprintf(buf, sizeof(buf), fmt, ap);
261		clrtoeol();
262		standout();
263		mvaddstr(CMDLINE, 0, buf);
264		standend();
265		move(oy, ox);
266		refresh();
267	} else {
268		(void) vfprintf(stderr, fmt, ap);
269		fprintf(stderr, "\n");
270	}
271	va_end(ap);
272}
273
274void
275nlisterr(struct nlist n_list[])
276{
277	int i, n;
278
279	n = 0;
280	clear();
281	mvprintw(2, 10, "systat: nlist: can't find following symbols:");
282	for (i = 0;
283	    n_list[i].n_name != NULL && *n_list[i].n_name != '\0'; i++)
284		if (n_list[i].n_value == 0)
285			mvprintw(2 + ++n, 10, "%s", n_list[i].n_name);
286	move(CMDLINE, 0);
287	clrtoeol();
288	refresh();
289	endwin();
290	exit(1);
291}
292