summaryrefslogtreecommitdiffstats
path: root/usr.bin/w/w.c
blob: a10275286b36b54d47feadf44ddc80e60c7a3b3c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
/*-
 * Copyright (c) 1980, 1991, 1993, 1994
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef lint
static const char copyright[] =
"@(#) Copyright (c) 1980, 1991, 1993, 1994\n\
	The Regents of the University of California.  All rights reserved.\n";
#endif /* not lint */

#ifndef lint
#if 0
static char sccsid[] = "@(#)w.c	8.4 (Berkeley) 4/16/94";
#endif
static const char rcsid[] =
	"$Id: w.c,v 1.27 1998/05/21 08:46:48 jkoshy Exp $";
#endif /* not lint */

/*
 * w - print system status (who and what)
 *
 * This program is similar to the systat command on Tenex/Tops 10/20
 *
 */
#include <sys/param.h>
#include <sys/time.h>
#include <sys/stat.h>
#include <sys/sysctl.h>
#include <sys/proc.h>
#include <sys/user.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/tty.h>

#include <machine/cpu.h>
#include <netinet/in.h>
#include <arpa/inet.h>

#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <kvm.h>
#include <netdb.h>
#include <nlist.h>
#include <paths.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <utmp.h>
#include <vis.h>
#include <locale.h>

#include <arpa/nameser.h>
#include <resolv.h>

#include "extern.h"

struct timeval	boottime;
struct utmp	utmp;
struct winsize	ws;
kvm_t	       *kd;
time_t		now;		/* the current time of day */
time_t		uptime;		/* time of last reboot & elapsed time since */
int		ttywidth;	/* width of tty */
int		argwidth;	/* width of tty */
int		header = 1;	/* true if -h flag: don't print heading */
int		nflag;		/* true if -n flag: don't convert addrs */
int		dflag;		/* true if -d flag: output debug info */
int		sortidle;	/* sort bu idle time */
char	       *sel_user;	/* login of particular user selected */
char		domain[MAXHOSTNAMELEN];

/*
 * One of these per active utmp entry.
 */
struct	entry {
	struct	entry *next;
	struct	utmp utmp;
	dev_t	tdev;			/* dev_t of terminal */
	time_t	idle;			/* idle time of terminal in seconds */
	struct	kinfo_proc *kp;		/* `most interesting' proc */
	char	*args;			/* arg list of interesting process */
	struct	kinfo_proc *dkp;	/* debug option proc list */
} *ep, *ehead = NULL, **nextp = &ehead;

static void	 pr_header __P((time_t *, int));
static struct stat
		*ttystat __P((char *));
static void	 usage __P((int));

char *fmt_argv __P((char **, char *, int));	/* ../../bin/ps/fmt.c */

int
main(argc, argv)
	int argc;
	char **argv;
{
	extern char *__progname;
	struct kinfo_proc *kp;
	struct kinfo_proc *dkp;
	struct hostent *hp;
	struct stat *stp;
	FILE *ut;
	u_long l;
	size_t arglen;
	int ch, i, nentries, nusers, wcmd, longidle;
	char *memf, *nlistf, *p, *x;
	char buf[MAXHOSTNAMELEN], errbuf[256];

	(void) setlocale(LC_ALL, "");

	/* Are we w(1) or uptime(1)? */
	p = __progname;
	if (*p == '-')
		p++;
	if (*p == 'u') {
		wcmd = 0;
		p = "";
	} else {
		wcmd = 1;
		p = "dhiflM:N:nsuw";
	}

	memf = nlistf = NULL;
	while ((ch = getopt(argc, argv, p)) != -1)
		switch (ch) {
		case 'd':
			dflag = 1;
			break;
		case 'h':
			header = 0;
			break;
		case 'i':
			sortidle = 1;
			break;
		case 'M':
			header = 0;
			memf = optarg;
			break;
		case 'N':
			nlistf = optarg;
			break;
		case 'n':
			nflag = 1;
			break;
		case 'f': case 'l': case 's': case 'u': case 'w':
			warnx("[-flsuw] no longer supported");
			/* FALLTHROUGH */
		case '?':
		default:
			usage(wcmd);
		}
	argc -= optind;
	argv += optind;

	if (!(_res.options & RES_INIT))
		res_init();
	_res.retrans = 2;	/* resolver timeout to 2 seconds per try */
	_res.retry = 1;		/* only try once.. */

	/*
	 * Discard setgid privileges if not the running kernel so that bad
	 * guys can't print interesting stuff from kernel memory.
	 */
	if (nlistf != NULL || memf != NULL)
		setgid(getgid());

	if ((kd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, errbuf)) == NULL)
		errx(1, "%s", errbuf);

	(void)time(&now);
	if ((ut = fopen(_PATH_UTMP, "r")) == NULL)
		err(1, "%s", _PATH_UTMP);

	if (*argv)
		sel_user = *argv;

	for (nusers = 0; fread(&utmp, sizeof(utmp), 1, ut);) {
		if (utmp.ut_name[0] == '\0')
			continue;
		if (!(stp = ttystat(utmp.ut_line))) /* corrupted record */
			continue;
		++nusers;
		if (wcmd == 0 || (sel_user &&
		    strncmp(utmp.ut_name, sel_user, UT_NAMESIZE) != 0))
			continue;
		if ((ep = calloc(1, sizeof(struct entry))) == NULL)
			errx(1, "calloc");
		*nextp = ep;
		nextp = &(ep->next);
		memmove(&(ep->utmp), &utmp, sizeof(struct utmp));
		ep->tdev = stp->st_rdev;
#ifdef CPU_CONSDEV
		/*
		 * If this is the console device, attempt to ascertain
		 * the true console device dev_t.
		 */
		if (ep->tdev == 0) {
			int mib[2];
			size_t size;

			mib[0] = CTL_MACHDEP;
			mib[1] = CPU_CONSDEV;
			size = sizeof(dev_t);
			(void) sysctl(mib, 2, &ep->tdev, &size, NULL, 0);
		}
#endif
		if ((ep->idle = now - stp->st_atime) < 0)
			ep->idle = 0;
	}
	(void)fclose(ut);

	if (header || wcmd == 0) {
		pr_header(&now, nusers);
		if (wcmd == 0)
			exit (0);

#define HEADER_USER		"USER"
#define HEADER_TTY		"TTY"
#define HEADER_FROM		"FROM"
#define HEADER_LOGIN_IDLE	"LOGIN@  IDLE "
#define HEADER_WHAT		"WHAT\n"
#define WUSED  (UT_NAMESIZE + UT_LINESIZE + UT_HOSTSIZE + \
		sizeof(HEADER_LOGIN_IDLE) + 3)	/* header width incl. spaces */ 
		(void)printf("%-*.*s %-*.*s %-*.*s  %s", 
				UT_NAMESIZE, UT_NAMESIZE, HEADER_USER,
				UT_LINESIZE, UT_LINESIZE, HEADER_TTY,
				UT_HOSTSIZE, UT_HOSTSIZE, HEADER_FROM,
				HEADER_LOGIN_IDLE HEADER_WHAT);
	}

	if ((kp = kvm_getprocs(kd, KERN_PROC_ALL, 0, &nentries)) == NULL)
		err(1, "%s", kvm_geterr(kd));
	for (i = 0; i < nentries; i++, kp++) {
		struct proc *p = &kp->kp_proc;
		struct eproc *e;

		if (p->p_stat == SIDL || p->p_stat == SZOMB)
			continue;
		e = &kp->kp_eproc;
		for (ep = ehead; ep != NULL; ep = ep->next) {
			if (ep->tdev == e->e_tdev) {
				/*
				 * proc is associated with this terminal
				 */
				if (ep->kp == NULL && e->e_pgid == e->e_tpgid) {
					/*
					 * Proc is 'most interesting'
					 */
					if (proc_compare(&ep->kp->kp_proc, p))
						ep->kp = kp;
				}
				/*
				 * Proc debug option info; add to debug
				 * list using kinfo_proc kp_eproc.e_spare
				 * as next pointer; ptr to ptr avoids the
				 * ptr = long assumption.
				 */
				dkp = ep->dkp;
				ep->dkp = kp;
				*((struct kinfo_proc **)(&kp->kp_eproc.e_spare[ 0])) = dkp;
			}
		}
	}
	if ((ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == -1 &&
	     ioctl(STDERR_FILENO, TIOCGWINSZ, &ws) == -1 &&
	     ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) == -1) || ws.ws_col == 0)
	       ttywidth = 79;
        else
	       ttywidth = ws.ws_col - 1;
	argwidth = ttywidth - WUSED;
	if (argwidth < 4)
		argwidth = 8;
	for (ep = ehead; ep != NULL; ep = ep->next) {
		if (ep->kp == NULL) {
			ep->args = "-";
			continue;
		}
		ep->args = fmt_argv(kvm_getargv(kd, ep->kp, argwidth),
		    ep->kp->kp_proc.p_comm, MAXCOMLEN);
		if (ep->args == NULL)
			err(1, NULL);
	}
	/* sort by idle time */
	if (sortidle && ehead != NULL) {
		struct entry *from = ehead, *save;

		ehead = NULL;
		while (from != NULL) {
			for (nextp = &ehead;
			    (*nextp) && from->idle >= (*nextp)->idle;
			    nextp = &(*nextp)->next)
				continue;
			save = from;
			from = from->next;
			save->next = *nextp;
			*nextp = save;
		}
	}

	if (!nflag)
		if (gethostname(domain, sizeof(domain) - 1) < 0 ||
		    (p = strchr(domain, '.')) == 0)
			domain[0] = '\0';
		else {
			domain[sizeof(domain) - 1] = '\0';
			memmove(domain, p, strlen(p) + 1);
		}

	for (ep = ehead; ep != NULL; ep = ep->next) {
		p = *ep->utmp.ut_host ? ep->utmp.ut_host : "-";
		if ((x = strchr(p, ':')) != NULL)
			*x++ = '\0';
		if (!nflag && isdigit(*p) &&
		    (long)(l = inet_addr(p)) != -1 &&
		    (hp = gethostbyaddr((char *)&l, sizeof(l), AF_INET))) {
			if (domain[0] != '\0') {
				p = hp->h_name;
				p += strlen(hp->h_name);
				p -= strlen(domain);
				if (p > hp->h_name && strcmp(p, domain) == 0)
					*p = '\0';
			}
			p = hp->h_name;
		}
		if (nflag && *p && strcmp(p, "-") && inet_addr(p) == INADDR_NONE) {
			hp = gethostbyname(p);

			if (hp != NULL) {
				struct in_addr in;

				memmove(&in, hp->h_addr, sizeof(in));
				p = inet_ntoa(in);
			}
		}
		if (x) {
			(void)snprintf(buf, sizeof(buf), "%s:%.*s", p,
			    ep->utmp.ut_host + UT_HOSTSIZE - x, x);
			p = buf;
		}
		if( dflag) {
			for( dkp = ep->dkp; dkp != NULL; dkp = *((struct kinfo_proc **)(&dkp->kp_eproc.e_spare[ 0]))) {
				char *p;
				p = fmt_argv(kvm_getargv(kd, dkp, argwidth),
					    dkp->kp_proc.p_comm, MAXCOMLEN);
				if (p == NULL)
					p = "-";
				(void)printf( "\t\t%-9d %s\n", dkp->kp_proc.p_pid, p);
			}
		}
		(void)printf("%-*.*s %-*.*s %-*.*s ",
		    UT_NAMESIZE, UT_NAMESIZE, ep->utmp.ut_name,
		    UT_LINESIZE, UT_LINESIZE,
		    strncmp(ep->utmp.ut_line, "tty", 3) &&
		    strncmp(ep->utmp.ut_line, "cua", 3) ?
		    ep->utmp.ut_line : ep->utmp.ut_line + 3,
		    UT_HOSTSIZE, UT_HOSTSIZE, *p ? p : "-");
		pr_attime(&ep->utmp.ut_time, &now);
		longidle=pr_idle(ep->idle);
		if (longidle)
			argwidth--;
		(void)printf("%.*s\n", argwidth, ep->args);
	}
	exit(0);
}

static void
pr_header(nowp, nusers)
	time_t *nowp;
	int nusers;
{
	double avenrun[3];
	time_t uptime;
	int days, hrs, i, mins, secs;
	int mib[2];
	size_t size;
	char buf[256];

	/*
	 * Print time of day.
	 *
	 * SCCS forces the string manipulation below, as it replaces
	 * %, M, and % in a character string with the file name.
	 */
	(void)strftime(buf, sizeof(buf) - 1,
	    __CONCAT("%l:%","M%p"), localtime(nowp));
	buf[sizeof(buf) - 1] = '\0';
	(void)printf("%s ", buf);

	/*
	 * Print how long system has been up.
	 * (Found by looking getting "boottime" from the kernel)
	 */
	mib[0] = CTL_KERN;
	mib[1] = KERN_BOOTTIME;
	size = sizeof(boottime);
	if (sysctl(mib, 2, &boottime, &size, NULL, 0) != -1 &&
	    boottime.tv_sec != 0) {
		uptime = now - boottime.tv_sec;
		uptime += 30;
		days = uptime / 86400;
		uptime %= 86400;
		hrs = uptime / 3600;
		uptime %= 3600;
		mins = uptime / 60;
		secs = uptime % 60;
		(void)printf(" up");
		if (days > 0)
			(void)printf(" %d day%s,", days, days > 1 ? "s" : "");
		if (hrs > 0 && mins > 0)
			(void)printf(" %2d:%02d,", hrs, mins);
		else if (hrs > 0)
			(void)printf(" %d hr%s,",
				     hrs, hrs > 1 ? "s" : "");
		else if (mins > 0)
			(void)printf(" %d min%s,",
				     mins, mins > 1 ? "s" : "");
		else
			(void)printf(" %d sec%s,",
				     secs, secs > 1 ? "s" : "");
	}

	/* Print number of users logged in to system */
	(void)printf(" %d user%s", nusers, nusers == 1 ? "" : "s");

	/*
	 * Print 1, 5, and 15 minute load averages.
	 */
	if (getloadavg(avenrun, sizeof(avenrun) / sizeof(avenrun[0])) == -1)
		(void)printf(", no load average information available\n");
	else {
		(void)printf(", load averages:");
		for (i = 0; i < (sizeof(avenrun) / sizeof(avenrun[0])); i++) {
			if (i > 0)
				(void)printf(",");
			(void)printf(" %.2f", avenrun[i]);
		}
		(void)printf("\n");
	}
}

static struct stat *
ttystat(line)
	char *line;
{
	static struct stat sb;
	char ttybuf[MAXPATHLEN];

	(void)snprintf(ttybuf, sizeof(ttybuf), "%s/%s", _PATH_DEV, line);
	if (stat(ttybuf, &sb)) {
		warn("%s", ttybuf);
		return NULL;
	}
	return (&sb);
}

static void
usage(wcmd)
	int wcmd;
{
	if (wcmd)
		(void)fprintf(stderr,
		    "usage: w [-dhin] [-M core] [-N system] [user]\n");
	else
		(void)fprintf(stderr,
			"usage: uptime\n");
	exit (1);
}
OpenPOWER on IntegriCloud