xref: /freebsd/usr.bin/systat/main.c (revision 5ae59dec60e3815b621ae87f74a377cf3449ca55)
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
35 static const char sccsid[] = "@(#)main.c	8.1 (Berkeley) 6/6/93";
36 #endif
37 
38 #ifndef lint
39 static 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 #include <sys/queue.h>
48 
49 #include <err.h>
50 #include <limits.h>
51 #include <locale.h>
52 #include <nlist.h>
53 #include <paths.h>
54 #include <signal.h>
55 #include <stdio.h>
56 #include <stdlib.h>
57 #include <string.h>
58 #include <unistd.h>
59 
60 #include "systat.h"
61 #include "extern.h"
62 
63 static int     dellave;
64 
65 kvm_t *kd;
66 sig_t	sigtstpdfl;
67 double avenrun[3];
68 int     col;
69 unsigned int	delay = 5000000;	/* in microseconds */
70 int     verbose = 1;                    /* to report kvm read errs */
71 struct	clockinfo clkinfo;
72 double	hertz;
73 char    c;
74 char    *namp;
75 char    hostname[MAXHOSTNAMELEN];
76 WINDOW  *wnd;
77 int     CMDLINE;
78 int     use_kvm = 1;
79 
80 static	WINDOW *wload;			/* one line window for load average */
81 
82 struct cmdentry {
83 	SLIST_ENTRY(cmdentry) link;
84 	char		*cmd;		/* Command name	*/
85 	char		*argv;		/* Arguments vector for a command */
86 };
87 SLIST_HEAD(, cmdentry) commands;
88 
89 static void
90 parse_cmd_args (int argc, char **argv)
91 {
92 	int in_command = 0;
93 	struct cmdentry *cmd = NULL;
94 	double t;
95 
96 	while (argc) {
97 		if (argv[0][0] == '-') {
98 			if (in_command)
99 					SLIST_INSERT_HEAD(&commands, cmd, link);
100 
101 			if (memcmp(argv[0], "--", 3) == 0) {
102 				in_command = 0; /*-- ends a command explicitly*/
103 				argc --, argv ++;
104 				continue;
105 			}
106 			cmd = calloc(1, sizeof(struct cmdentry));
107 			if (cmd == NULL)
108 				errx(1, "memory allocating failure");
109 			cmd->cmd = strdup(&argv[0][1]);
110 			if (cmd->cmd == NULL)
111 				errx(1, "memory allocating failure");
112 			in_command = 1;
113 		}
114 		else if (!in_command) {
115 			t = strtod(argv[0], NULL) * 1000000.0;
116 			if (t > 0 && t < (double)UINT_MAX)
117 				delay = (unsigned int)t;
118 		}
119 		else if (cmd != NULL) {
120 			cmd->argv = strdup(argv[0]);
121 			if (cmd->argv == NULL)
122 				errx(1, "memory allocating failure");
123 			in_command = 0;
124 			SLIST_INSERT_HEAD(&commands, cmd, link);
125 		}
126 		else
127 			errx(1, "invalid arguments list");
128 
129 		argc--, argv++;
130 	}
131 	if (in_command && cmd != NULL)
132 		SLIST_INSERT_HEAD(&commands, cmd, link);
133 
134 }
135 
136 int
137 main(int argc, char **argv)
138 {
139 	char errbuf[_POSIX2_LINE_MAX], dummy;
140 	size_t	size;
141 	double t;
142 	struct cmdentry *cmd = NULL;
143 
144 #ifdef USE_WIDECHAR
145 	(void) setlocale(LC_ALL, "");
146 #else
147 	(void) setlocale(LC_TIME, "");
148 #endif
149 
150 	SLIST_INIT(&commands);
151 	argc--, argv++;
152 	if (argc > 0) {
153 		if (argv[0][0] == '-') {
154 			struct cmdtab *p;
155 
156 			p = lookup(&argv[0][1]);
157 			if (p == (struct cmdtab *)-1)
158 				errx(1, "%s: ambiguous request", &argv[0][1]);
159 			if (p == (struct cmdtab *)0)
160 				errx(1, "%s: unknown request", &argv[0][1]);
161 			curcmd = p;
162 			argc--, argv++;
163 		}
164 		parse_cmd_args (argc, argv);
165 
166 	}
167 	kd = kvm_openfiles(NULL, NULL, NULL, O_RDONLY, errbuf);
168 	if (kd != NULL) {
169 		/*
170 		 * Try to actually read something, we may be in a jail, and
171 		 * have /dev/null opened as /dev/mem.
172 		 */
173 		if (kvm_nlist(kd, namelist) != 0 || namelist[0].n_value == 0 ||
174 		    kvm_read(kd, namelist[0].n_value, &dummy, sizeof(dummy)) !=
175 		    sizeof(dummy)) {
176 			kvm_close(kd);
177 			kd = NULL;
178 		}
179 	}
180 	if (kd == NULL) {
181 		/*
182 		 * Maybe we are lacking permissions? Retry, this time with bogus
183 		 * devices. We can now use sysctl only.
184 		 */
185 		use_kvm = 0;
186 		kd = kvm_openfiles("/dev/null", "/dev/null", "/dev/null",
187 		    O_RDONLY, errbuf);
188 		if (kd == NULL) {
189 			error("%s", errbuf);
190 			exit(1);
191 		}
192 	}
193 	signal(SIGHUP, die);
194 	signal(SIGINT, die);
195 	signal(SIGQUIT, die);
196 	signal(SIGTERM, die);
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 	initscr();
205 	CMDLINE = LINES - 1;
206 	wnd = (*curcmd->c_open)();
207 	if (wnd == NULL) {
208 		warnx("couldn't initialize display");
209 		die(0);
210 	}
211 	wload = newwin(1, 0, 1, 20);
212 	if (wload == NULL) {
213 		warnx("couldn't set up load average window");
214 		die(0);
215 	}
216 	gethostname(hostname, sizeof (hostname));
217 	size = sizeof(clkinfo);
218 	if (sysctlbyname("kern.clockrate", &clkinfo, &size, NULL, 0)
219 	    || size != sizeof(clkinfo)) {
220 		error("kern.clockrate");
221 		die(0);
222 	}
223 	hertz = clkinfo.stathz;
224 	(*curcmd->c_init)();
225 	curcmd->c_flags |= CF_INIT;
226 	labels();
227 
228 	if (curcmd->c_cmd != NULL)
229 		SLIST_FOREACH (cmd, &commands, link)
230 			if (!curcmd->c_cmd(cmd->cmd, cmd->argv))
231 				warnx("command is not understood");
232 
233 	dellave = 0.0;
234 	display();
235 	noecho();
236 	crmode();
237 	keyboard();
238 	/*NOTREACHED*/
239 
240 	return EXIT_SUCCESS;
241 }
242 
243 void
244 labels(void)
245 {
246 	if (curcmd->c_flags & CF_LOADAV) {
247 		mvaddstr(0, 20,
248 		    "/0   /1   /2   /3   /4   /5   /6   /7   /8   /9   /10");
249 		mvaddstr(1, 5, "Load Average");
250 	}
251 	(*curcmd->c_label)();
252 #ifdef notdef
253 	mvprintw(21, 25, "CPU usage on %s", hostname);
254 #endif
255 	refresh();
256 }
257 
258 void
259 display(void)
260 {
261 	int i, j;
262 
263 	/* Get the load average over the last minute. */
264 	(void) getloadavg(avenrun, sizeof(avenrun) / sizeof(avenrun[0]));
265 	(*curcmd->c_fetch)();
266 	if (curcmd->c_flags & CF_LOADAV) {
267 		j = 5.0*avenrun[0] + 0.5;
268 		dellave -= avenrun[0];
269 		if (dellave >= 0.0)
270 			c = '<';
271 		else {
272 			c = '>';
273 			dellave = -dellave;
274 		}
275 		if (dellave < 0.1)
276 			c = '|';
277 		dellave = avenrun[0];
278 		wmove(wload, 0, 0); wclrtoeol(wload);
279 		for (i = (j > 50) ? 50 : j; i > 0; i--)
280 			waddch(wload, c);
281 		if (j > 50)
282 			wprintw(wload, " %4.1f", avenrun[0]);
283 	}
284 	(*curcmd->c_refresh)();
285 	if (curcmd->c_flags & CF_LOADAV)
286 		wrefresh(wload);
287 	wrefresh(wnd);
288 	move(CMDLINE, col);
289 	refresh();
290 }
291 
292 void
293 load(void)
294 {
295 
296 	(void) getloadavg(avenrun, sizeof(avenrun)/sizeof(avenrun[0]));
297 	mvprintw(CMDLINE, 0, "%4.1f %4.1f %4.1f",
298 	    avenrun[0], avenrun[1], avenrun[2]);
299 	clrtoeol();
300 }
301 
302 void
303 die(int signo __unused)
304 {
305 	move(CMDLINE, 0);
306 	clrtoeol();
307 	refresh();
308 	endwin();
309 	exit(0);
310 }
311 
312 #include <stdarg.h>
313 
314 void
315 error(const char *fmt, ...)
316 {
317 	va_list ap;
318 	char buf[255];
319 	int oy, ox;
320 
321 	va_start(ap, fmt);
322 	if (wnd) {
323 		getyx(stdscr, oy, ox);
324 		(void) vsnprintf(buf, sizeof(buf), fmt, ap);
325 		clrtoeol();
326 		standout();
327 		mvaddstr(CMDLINE, 0, buf);
328 		standend();
329 		move(oy, ox);
330 		refresh();
331 	} else {
332 		(void) vfprintf(stderr, fmt, ap);
333 		fprintf(stderr, "\n");
334 	}
335 	va_end(ap);
336 }
337 
338 void
339 nlisterr(struct nlist n_list[])
340 {
341 	int i, n;
342 
343 	n = 0;
344 	clear();
345 	mvprintw(2, 10, "systat: nlist: can't find following symbols:");
346 	for (i = 0;
347 	    n_list[i].n_name != NULL && *n_list[i].n_name != '\0'; i++)
348 		if (n_list[i].n_value == 0)
349 			mvprintw(2 + ++n, 10, "%s", n_list[i].n_name);
350 	move(CMDLINE, 0);
351 	clrtoeol();
352 	refresh();
353 	endwin();
354 	exit(1);
355 }
356