w.c revision 11811 
1/*-
2 * Copyright (c) 1980, 1991, 1993, 1994
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#ifndef lint
35static char copyright[] =
36"@(#) Copyright (c) 1980, 1991, 1993, 1994\n\
37	The Regents of the University of California.  All rights reserved.\n";
38#endif /* not lint */
39
40#ifndef lint
41static char sccsid[] = "@(#)w.c	8.4 (Berkeley) 4/16/94";
42#endif /* not lint */
43
44/*
45 * w - print system status (who and what)
46 *
47 * This program is similar to the systat command on Tenex/Tops 10/20
48 *
49 */
50#include <sys/param.h>
51#include <sys/time.h>
52#include <sys/stat.h>
53#include <sys/sysctl.h>
54#include <sys/proc.h>
55#include <sys/user.h>
56#include <sys/ioctl.h>
57#include <sys/socket.h>
58#include <sys/tty.h>
59
60#include <machine/cpu.h>
61#include <netinet/in.h>
62#include <arpa/inet.h>
63
64#include <ctype.h>
65#include <err.h>
66#include <errno.h>
67#include <fcntl.h>
68#include <kvm.h>
69#include <netdb.h>
70#include <nlist.h>
71#include <paths.h>
72#include <stdio.h>
73#include <stdlib.h>
74#include <string.h>
75#include <unistd.h>
76#include <utmp.h>
77#include <vis.h>
78#include <locale.h>
79
80#include <arpa/nameser.h>
81#include <resolv.h>
82
83#include "extern.h"
84
85struct timeval	boottime;
86struct utmp	utmp;
87struct winsize	ws;
88kvm_t	       *kd;
89time_t		now;		/* the current time of day */
90time_t		uptime;		/* time of last reboot & elapsed time since */
91int		ttywidth;	/* width of tty */
92int		argwidth;	/* width of tty */
93int		header = 1;	/* true if -h flag: don't print heading */
94int		nflag;		/* true if -n flag: don't convert addrs */
95int		sortidle;	/* sort bu idle time */
96char	       *sel_user;	/* login of particular user selected */
97char		domain[MAXHOSTNAMELEN];
98
99/*
100 * One of these per active utmp entry.
101 */
102struct	entry {
103	struct	entry *next;
104	struct	utmp utmp;
105	dev_t	tdev;		/* dev_t of terminal */
106	time_t	idle;		/* idle time of terminal in seconds */
107	struct	kinfo_proc *kp;	/* `most interesting' proc */
108	char	*args;		/* arg list of interesting process */
109} *ep, *ehead = NULL, **nextp = &ehead;
110
111static void	 pr_header __P((time_t *, int));
112static struct stat
113		*ttystat __P((char *));
114static void	 usage __P((int));
115
116char *fmt_argv __P((char **, char *, int));	/* ../../bin/ps/fmt.c */
117
118int
119main(argc, argv)
120	int argc;
121	char **argv;
122{
123	extern char *__progname;
124	struct kinfo_proc *kp;
125	struct hostent *hp;
126	struct stat *stp;
127	FILE *ut;
128	u_long l;
129	size_t arglen;
130	int ch, i, nentries, nusers, wcmd;
131	char *memf, *nlistf, *p, *vis_args, *x;
132	char buf[MAXHOSTNAMELEN], errbuf[256];
133
134	(void) setlocale(LC_ALL, "");
135
136	/* Are we w(1) or uptime(1)? */
137	p = __progname;
138	if (*p == '-')
139		p++;
140	if (*p == 'u') {
141		wcmd = 0;
142		p = "";
143	} else {
144		wcmd = 1;
145		p = "hiflM:N:nsuw";
146	}
147
148	memf = nlistf = NULL;
149	while ((ch = getopt(argc, argv, p)) != EOF)
150		switch (ch) {
151		case 'h':
152			header = 0;
153			break;
154		case 'i':
155			sortidle = 1;
156			break;
157		case 'M':
158			header = 0;
159			memf = optarg;
160			break;
161		case 'N':
162			nlistf = optarg;
163			break;
164		case 'n':
165			nflag = 1;
166			break;
167		case 'f': case 'l': case 's': case 'u': case 'w':
168			warnx("[-flsuw] no longer supported");
169			/* FALLTHROUGH */
170		case '?':
171		default:
172			usage(wcmd);
173		}
174	argc -= optind;
175	argv += optind;
176
177	if (!(_res.options & RES_INIT))
178		res_init();
179	_res.retrans = 2;	/* resolver timeout to 2 seconds per try */
180	_res.retry = 1;		/* only try once.. */
181
182	if ((kd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, errbuf)) == NULL)
183		errx(1, "%s", errbuf);
184
185	(void)time(&now);
186	if ((ut = fopen(_PATH_UTMP, "r")) == NULL)
187		err(1, "%s", _PATH_UTMP);
188
189	if (*argv)
190		sel_user = *argv;
191
192	for (nusers = 0; fread(&utmp, sizeof(utmp), 1, ut);) {
193		if (utmp.ut_name[0] == '\0')
194			continue;
195		++nusers;
196		if (wcmd == 0 || (sel_user &&
197		    strncmp(utmp.ut_name, sel_user, UT_NAMESIZE) != 0))
198			continue;
199		if ((ep = calloc(1, sizeof(struct entry))) == NULL)
200			err(1, NULL);
201		*nextp = ep;
202		nextp = &(ep->next);
203		memmove(&(ep->utmp), &utmp, sizeof(struct utmp));
204		stp = ttystat(ep->utmp.ut_line);
205		ep->tdev = stp->st_rdev;
206#ifdef CPU_CONSDEV
207		/*
208		 * If this is the console device, attempt to ascertain
209		 * the true console device dev_t.
210		 */
211		if (ep->tdev == 0) {
212			int mib[2];
213			size_t size;
214
215			mib[0] = CTL_MACHDEP;
216			mib[1] = CPU_CONSDEV;
217			size = sizeof(dev_t);
218			(void) sysctl(mib, 2, &ep->tdev, &size, NULL, 0);
219		}
220#endif
221		if ((ep->idle = now - stp->st_atime) < 0)
222			ep->idle = 0;
223	}
224	(void)fclose(ut);
225
226	if (header || wcmd == 0) {
227		pr_header(&now, nusers);
228		if (wcmd == 0)
229			exit (0);
230
231#define HEADER	"USER     TTY FROM              LOGIN@  IDLE WHAT\n"
232#define WUSED	(sizeof (HEADER) - sizeof ("WHAT\n"))
233		(void)printf(HEADER);
234	}
235
236	if ((kp = kvm_getprocs(kd, KERN_PROC_ALL, 0, &nentries)) == NULL)
237		err(1, "%s", kvm_geterr(kd));
238	for (i = 0; i < nentries; i++, kp++) {
239		struct proc *p = &kp->kp_proc;
240		struct eproc *e;
241
242		if (p->p_stat == SIDL || p->p_stat == SZOMB)
243			continue;
244		e = &kp->kp_eproc;
245		for (ep = ehead; ep != NULL; ep = ep->next) {
246			if (ep->tdev == e->e_tdev && e->e_pgid == e->e_tpgid) {
247				/*
248				 * Proc is in foreground of this terminal
249				 */
250				if (proc_compare(&ep->kp->kp_proc, p))
251					ep->kp = kp;
252				break;
253			}
254		}
255	}
256	if ((ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == -1 &&
257	     ioctl(STDERR_FILENO, TIOCGWINSZ, &ws) == -1 &&
258	     ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) == -1) || ws.ws_col == 0)
259	       ttywidth = 79;
260        else
261	       ttywidth = ws.ws_col - 1;
262	argwidth = ttywidth - WUSED;
263	if (argwidth < 4)
264		argwidth = 8;
265	for (ep = ehead; ep != NULL; ep = ep->next) {
266		if (ep->kp == NULL) {
267			ep->args = "-";
268			continue;
269		}
270		ep->args = fmt_argv(kvm_getargv(kd, ep->kp, argwidth),
271		    ep->kp->kp_proc.p_comm, MAXCOMLEN);
272		if (ep->args == NULL)
273			err(1, NULL);
274	}
275	/* sort by idle time */
276	if (sortidle && ehead != NULL) {
277		struct entry *from = ehead, *save;
278
279		ehead = NULL;
280		while (from != NULL) {
281			for (nextp = &ehead;
282			    (*nextp) && from->idle >= (*nextp)->idle;
283			    nextp = &(*nextp)->next)
284				continue;
285			save = from;
286			from = from->next;
287			save->next = *nextp;
288			*nextp = save;
289		}
290	}
291
292	if (!nflag)
293		if (gethostname(domain, sizeof(domain) - 1) < 0 ||
294		    (p = strchr(domain, '.')) == 0)
295			domain[0] = '\0';
296		else {
297			domain[sizeof(domain) - 1] = '\0';
298			memmove(domain, p, strlen(p) + 1);
299		}
300
301	if ((vis_args = malloc(argwidth * 4 + 1)) == NULL)
302		err(1, NULL);
303	for (ep = ehead; ep != NULL; ep = ep->next) {
304		p = *ep->utmp.ut_host ? ep->utmp.ut_host : "-";
305		if ((x = strchr(p, ':')) != NULL)
306			*x++ = '\0';
307		if (!nflag && isdigit(*p) &&
308		    (long)(l = inet_addr(p)) != -1 &&
309		    (hp = gethostbyaddr((char *)&l, sizeof(l), AF_INET))) {
310			if (domain[0] != '\0') {
311				p = hp->h_name;
312				p += strlen(hp->h_name);
313				p -= strlen(domain);
314				if (p > hp->h_name && strcmp(p, domain) == 0)
315					*p = '\0';
316			}
317			p = hp->h_name;
318		}
319		if (x) {
320			(void)snprintf(buf, sizeof(buf), "%s:%.*s", p,
321			    ep->utmp.ut_host + UT_HOSTSIZE - x, x);
322			p = buf;
323		}
324		(void)printf("%-*.*s %-3.3s %-*.*s ",
325		    UT_NAMESIZE, UT_NAMESIZE, ep->utmp.ut_name,
326		    strncmp(ep->utmp.ut_line, "tty", 3) &&
327		    strncmp(ep->utmp.ut_line, "cua", 3) ?
328		    ep->utmp.ut_line : ep->utmp.ut_line + 3,
329		    UT_HOSTSIZE, UT_HOSTSIZE, *p ? p : "-");
330		pr_attime(&ep->utmp.ut_time, &now);
331		pr_idle(ep->idle);
332		if (ep->args != NULL) {
333			arglen = strlen(ep->args);
334			strvisx(vis_args, ep->args,
335			    arglen > argwidth ? argwidth : arglen,
336			    VIS_TAB | VIS_NL | VIS_NOSLASH);
337		}
338		(void)printf("%.*s\n", argwidth, ep->args);
339	}
340	exit(0);
341}
342
343static void
344pr_header(nowp, nusers)
345	time_t *nowp;
346	int nusers;
347{
348	double avenrun[3];
349	time_t uptime;
350	int days, hrs, i, mins;
351	int mib[2];
352	size_t size;
353	char buf[256];
354
355	/*
356	 * Print time of day.
357	 *
358	 * SCCS forces the string manipulation below, as it replaces
359	 * %, M, and % in a character string with the file name.
360	 */
361	(void)strftime(buf, sizeof(buf),
362	    __CONCAT("%l:%","M%p"), localtime(nowp));
363	(void)printf("%s ", buf);
364
365	/*
366	 * Print how long system has been up.
367	 * (Found by looking getting "boottime" from the kernel)
368	 */
369	mib[0] = CTL_KERN;
370	mib[1] = KERN_BOOTTIME;
371	size = sizeof(boottime);
372	if (sysctl(mib, 2, &boottime, &size, NULL, 0) != -1 &&
373	    boottime.tv_sec != 0) {
374		uptime = now - boottime.tv_sec;
375		uptime += 30;
376		days = uptime / 86400;
377		uptime %= 86400;
378		hrs = uptime / 3600;
379		uptime %= 3600;
380		mins = uptime / 60;
381		(void)printf(" up");
382		if (days > 0)
383			(void)printf(" %d day%s,", days, days > 1 ? "s" : "");
384		if (hrs > 0 && mins > 0)
385			(void)printf(" %2d:%02d,", hrs, mins);
386		else {
387			if (hrs > 0)
388				(void)printf(" %d hr%s,",
389				    hrs, hrs > 1 ? "s" : "");
390			if (mins > 0)
391				(void)printf(" %d min%s,",
392				    mins, mins > 1 ? "s" : "");
393		}
394	}
395
396	/* Print number of users logged in to system */
397	(void)printf(" %d user%s", nusers, nusers == 1 ? "" : "s");
398
399	/*
400	 * Print 1, 5, and 15 minute load averages.
401	 */
402	if (getloadavg(avenrun, sizeof(avenrun) / sizeof(avenrun[0])) == -1)
403		(void)printf(", no load average information available\n");
404	else {
405		(void)printf(", load averages:");
406		for (i = 0; i < (sizeof(avenrun) / sizeof(avenrun[0])); i++) {
407			if (i > 0)
408				(void)printf(",");
409			(void)printf(" %.2f", avenrun[i]);
410		}
411		(void)printf("\n");
412	}
413}
414
415static struct stat *
416ttystat(line)
417	char *line;
418{
419	static struct stat sb;
420	char ttybuf[MAXPATHLEN];
421
422	(void)snprintf(ttybuf, sizeof(ttybuf), "%s/%s", _PATH_DEV, line);
423	if (stat(ttybuf, &sb))
424		err(1, "%s", ttybuf);
425	return (&sb);
426}
427
428static void
429usage(wcmd)
430	int wcmd;
431{
432	if (wcmd)
433		(void)fprintf(stderr,
434		    "usage: w: [-hin] [-M core] [-N system] [user]\n");
435	else
436		(void)fprintf(stderr, "uptime\n");
437	exit (1);
438}
439