w.c revision 1590 
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 <tzfile.h>
76#include <unistd.h>
77#include <utmp.h>
78#include <vis.h>
79
80#include "extern.h"
81
82struct timeval	boottime;
83struct utmp	utmp;
84struct winsize	ws;
85kvm_t	       *kd;
86time_t		now;		/* the current time of day */
87time_t		uptime;		/* time of last reboot & elapsed time since */
88int		ttywidth;	/* width of tty */
89int		argwidth;	/* width of tty */
90int		header = 1;	/* true if -h flag: don't print heading */
91int		nflag;		/* true if -n flag: don't convert addrs */
92int		sortidle;	/* sort bu idle time */
93char	       *sel_user;	/* login of particular user selected */
94char		domain[MAXHOSTNAMELEN];
95
96/*
97 * One of these per active utmp entry.
98 */
99struct	entry {
100	struct	entry *next;
101	struct	utmp utmp;
102	dev_t	tdev;		/* dev_t of terminal */
103	time_t	idle;		/* idle time of terminal in seconds */
104	struct	kinfo_proc *kp;	/* `most interesting' proc */
105	char	*args;		/* arg list of interesting process */
106} *ep, *ehead = NULL, **nextp = &ehead;
107
108static void	 pr_header __P((time_t *, int));
109static struct stat
110		*ttystat __P((char *));
111static void	 usage __P((int));
112
113char *fmt_argv __P((char **, char *, int));	/* ../../bin/ps/fmt.c */
114
115int
116main(argc, argv)
117	int argc;
118	char **argv;
119{
120	extern char *__progname;
121	struct kinfo_proc *kp;
122	struct hostent *hp;
123	struct stat *stp;
124	FILE *ut;
125	u_long l;
126	size_t arglen;
127	int ch, i, nentries, nusers, wcmd;
128	char *memf, *nlistf, *p, *vis_args, *x;
129	char buf[MAXHOSTNAMELEN], errbuf[256];
130
131	/* Are we w(1) or uptime(1)? */
132	p = __progname;
133	if (*p == '-')
134		p++;
135	if (*p == 'u') {
136		wcmd = 0;
137		p = "";
138	} else {
139		wcmd = 1;
140		p = "hiflM:N:nsuw";
141	}
142
143	memf = nlistf = NULL;
144	while ((ch = getopt(argc, argv, p)) != EOF)
145		switch (ch) {
146		case 'h':
147			header = 0;
148			break;
149		case 'i':
150			sortidle = 1;
151			break;
152		case 'M':
153			header = 0;
154			memf = optarg;
155			break;
156		case 'N':
157			nlistf = optarg;
158			break;
159		case 'n':
160			nflag = 1;
161			break;
162		case 'f': case 'l': case 's': case 'u': case 'w':
163			warnx("[-flsuw] no longer supported");
164			/* FALLTHROUGH */
165		case '?':
166		default:
167			usage(wcmd);
168		}
169	argc -= optind;
170	argv += optind;
171
172	if ((kd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, errbuf)) == NULL)
173		errx(1, "%s", errbuf);
174
175	(void)time(&now);
176	if ((ut = fopen(_PATH_UTMP, "r")) == NULL)
177		err(1, "%s", _PATH_UTMP);
178
179	if (*argv)
180		sel_user = *argv;
181
182	for (nusers = 0; fread(&utmp, sizeof(utmp), 1, ut);) {
183		if (utmp.ut_name[0] == '\0')
184			continue;
185		++nusers;
186		if (wcmd == 0 || (sel_user &&
187		    strncmp(utmp.ut_name, sel_user, UT_NAMESIZE) != 0))
188			continue;
189		if ((ep = calloc(1, sizeof(struct entry))) == NULL)
190			err(1, NULL);
191		*nextp = ep;
192		nextp = &(ep->next);
193		memmove(&(ep->utmp), &utmp, sizeof(struct utmp));
194		stp = ttystat(ep->utmp.ut_line);
195		ep->tdev = stp->st_rdev;
196#ifdef CPU_CONSDEV
197		/*
198		 * If this is the console device, attempt to ascertain
199		 * the true console device dev_t.
200		 */
201		if (ep->tdev == 0) {
202			int mib[2];
203			size_t size;
204
205			mib[0] = CTL_MACHDEP;
206			mib[1] = CPU_CONSDEV;
207			size = sizeof(dev_t);
208			(void) sysctl(mib, 2, &ep->tdev, &size, NULL, 0);
209		}
210#endif
211		if ((ep->idle = now - stp->st_atime) < 0)
212			ep->idle = 0;
213	}
214	(void)fclose(ut);
215
216	if (header || wcmd == 0) {
217		pr_header(&now, nusers);
218		if (wcmd == 0)
219			exit (0);
220	}
221
222#define HEADER	"USER    TTY FROM              LOGIN@  IDLE WHAT\n"
223#define WUSED	(sizeof (HEADER) - sizeof ("WHAT\n"))
224	(void)printf(HEADER);
225
226	if ((kp = kvm_getprocs(kd, KERN_PROC_ALL, 0, &nentries)) == NULL)
227		err(1, "%s", kvm_geterr(kd));
228	for (i = 0; i < nentries; i++, kp++) {
229		struct proc *p = &kp->kp_proc;
230		struct eproc *e;
231
232		if (p->p_stat == SIDL || p->p_stat == SZOMB)
233			continue;
234		e = &kp->kp_eproc;
235		for (ep = ehead; ep != NULL; ep = ep->next) {
236			if (ep->tdev == e->e_tdev && e->e_pgid == e->e_tpgid) {
237				/*
238				 * Proc is in foreground of this terminal
239				 */
240				if (proc_compare(&ep->kp->kp_proc, p))
241					ep->kp = kp;
242				break;
243			}
244		}
245	}
246	if ((ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == -1 &&
247	     ioctl(STDERR_FILENO, TIOCGWINSZ, &ws) == -1 &&
248	     ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) == -1) || ws.ws_col == 0)
249	       ttywidth = 79;
250        else
251	       ttywidth = ws.ws_col - 1;
252	argwidth = ttywidth - WUSED;
253	if (argwidth < 4)
254		argwidth = 8;
255	for (ep = ehead; ep != NULL; ep = ep->next) {
256		if (ep->kp == NULL) {
257			ep->args = "-";
258			continue;
259		}
260		ep->args = fmt_argv(kvm_getargv(kd, ep->kp, argwidth),
261		    ep->kp->kp_proc.p_comm, MAXCOMLEN);
262		if (ep->args == NULL)
263			err(1, NULL);
264	}
265	/* sort by idle time */
266	if (sortidle && ehead != NULL) {
267		struct entry *from = ehead, *save;
268
269		ehead = NULL;
270		while (from != NULL) {
271			for (nextp = &ehead;
272			    (*nextp) && from->idle >= (*nextp)->idle;
273			    nextp = &(*nextp)->next)
274				continue;
275			save = from;
276			from = from->next;
277			save->next = *nextp;
278			*nextp = save;
279		}
280	}
281
282	if (!nflag)
283		if (gethostname(domain, sizeof(domain) - 1) < 0 ||
284		    (p = strchr(domain, '.')) == 0)
285			domain[0] = '\0';
286		else {
287			domain[sizeof(domain) - 1] = '\0';
288			memmove(domain, p, strlen(p) + 1);
289		}
290
291	if ((vis_args = malloc(argwidth * 4 + 1)) == NULL)
292		err(1, NULL);
293	for (ep = ehead; ep != NULL; ep = ep->next) {
294		p = *ep->utmp.ut_host ? ep->utmp.ut_host : "-";
295		if ((x = strchr(p, ':')) != NULL)
296			*x++ = '\0';
297		if (!nflag && isdigit(*p) &&
298		    (long)(l = inet_addr(p)) != -1 &&
299		    (hp = gethostbyaddr((char *)&l, sizeof(l), AF_INET))) {
300			if (domain[0] != '\0') {
301				p = hp->h_name;
302				p += strlen(hp->h_name);
303				p -= strlen(domain);
304				if (p > hp->h_name && strcmp(p, domain) == 0)
305					*p = '\0';
306			}
307			p = hp->h_name;
308		}
309		if (x) {
310			(void)snprintf(buf, sizeof(buf), "%s:%s", p, x);
311			p = buf;
312		}
313		(void)printf("%-*.*s %-2.2s %-*.*s ",
314		    UT_NAMESIZE, UT_NAMESIZE, ep->utmp.ut_name,
315		    strncmp(ep->utmp.ut_line, "tty", 3) ?
316		    ep->utmp.ut_line : ep->utmp.ut_line + 3,
317		    UT_HOSTSIZE, UT_HOSTSIZE, *p ? p : "-");
318		pr_attime(&ep->utmp.ut_time, &now);
319		pr_idle(ep->idle);
320		if (ep->args != NULL) {
321			arglen = strlen(ep->args);
322			strvisx(vis_args, ep->args,
323			    arglen > argwidth ? argwidth : arglen,
324			    VIS_TAB | VIS_NL | VIS_NOSLASH);
325		}
326		(void)printf("%.*s\n", argwidth, ep->args);
327	}
328	exit(0);
329}
330
331static void
332pr_header(nowp, nusers)
333	time_t *nowp;
334	int nusers;
335{
336	double avenrun[3];
337	time_t uptime;
338	int days, hrs, i, mins;
339	int mib[2];
340	size_t size;
341	char buf[256];
342
343	/*
344	 * Print time of day.
345	 *
346	 * SCCS forces the string manipulation below, as it replaces
347	 * %, M, and % in a character string with the file name.
348	 */
349	(void)strftime(buf, sizeof(buf),
350	    __CONCAT("%l:%","M%p"), localtime(nowp));
351	(void)printf("%s ", buf);
352
353	/*
354	 * Print how long system has been up.
355	 * (Found by looking getting "boottime" from the kernel)
356	 */
357	mib[0] = CTL_KERN;
358	mib[1] = KERN_BOOTTIME;
359	size = sizeof(boottime);
360	if (sysctl(mib, 2, &boottime, &size, NULL, 0) != -1 &&
361	    boottime.tv_sec != 0) {
362		uptime = now - boottime.tv_sec;
363		uptime += 30;
364		days = uptime / SECSPERDAY;
365		uptime %= SECSPERDAY;
366		hrs = uptime / SECSPERHOUR;
367		uptime %= SECSPERHOUR;
368		mins = uptime / SECSPERMIN;
369		(void)printf(" up");
370		if (days > 0)
371			(void)printf(" %d day%s,", days, days > 1 ? "s" : "");
372		if (hrs > 0 && mins > 0)
373			(void)printf(" %2d:%02d,", hrs, mins);
374		else {
375			if (hrs > 0)
376				(void)printf(" %d hr%s,",
377				    hrs, hrs > 1 ? "s" : "");
378			if (mins > 0)
379				(void)printf(" %d min%s,",
380				    mins, mins > 1 ? "s" : "");
381		}
382	}
383
384	/* Print number of users logged in to system */
385	(void)printf(" %d user%s", nusers, nusers > 1 ? "s" : "");
386
387	/*
388	 * Print 1, 5, and 15 minute load averages.
389	 */
390	if (getloadavg(avenrun, sizeof(avenrun) / sizeof(avenrun[0])) == -1)
391		(void)printf(", no load average information available\n");
392	else {
393		(void)printf(", load averages:");
394		for (i = 0; i < (sizeof(avenrun) / sizeof(avenrun[0])); i++) {
395			if (i > 0)
396				(void)printf(",");
397			(void)printf(" %.2f", avenrun[i]);
398		}
399		(void)printf("\n");
400	}
401}
402
403static struct stat *
404ttystat(line)
405	char *line;
406{
407	static struct stat sb;
408	char ttybuf[MAXPATHLEN];
409
410	(void)snprintf(ttybuf, sizeof(ttybuf), "%s/%s", _PATH_DEV, line);
411	if (stat(ttybuf, &sb))
412		err(1, "%s", ttybuf);
413	return (&sb);
414}
415
416static void
417usage(wcmd)
418	int wcmd;
419{
420	if (wcmd)
421		(void)fprintf(stderr,
422		    "usage: w: [-hin] [-M core] [-N system] [user]\n");
423	else
424		(void)fprintf(stderr, "uptime\n");
425	exit (1);
426}
427