Remove some unnecessary casts.
[dragonfly.git] / usr.bin / w / w.c
CommitLineData
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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.
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32 *
33 * @(#) Copyright (c) 1980, 1991, 1993, 1994 The Regents of the University of California. All rights reserved.
34 * @(#)w.c 8.4 (Berkeley) 4/16/94
35 * $FreeBSD: src/usr.bin/w/w.c,v 1.38.2.6 2002/03/12 19:51:51 phantom Exp $
416d05d7 36 * $DragonFly: src/usr.bin/w/w.c,v 1.10 2007/02/18 16:15:24 corecode Exp $
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37 */
38
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39/*
40 * w - print system status (who and what)
41 *
42 * This program is similar to the systat command on Tenex/Tops 10/20
43 *
44 */
45#include <sys/param.h>
46#include <sys/time.h>
47#include <sys/stat.h>
48#include <sys/sysctl.h>
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49#include <sys/user.h>
50#include <sys/ioctl.h>
51#include <sys/socket.h>
52#include <sys/tty.h>
53
54#include <machine/cpu.h>
55#include <netinet/in.h>
56#include <arpa/inet.h>
57
58#include <ctype.h>
59#include <err.h>
60#include <errno.h>
61#include <fcntl.h>
62#include <kvm.h>
63#include <limits.h>
64#include <langinfo.h>
65#include <locale.h>
66#include <netdb.h>
67#include <nlist.h>
68#include <paths.h>
69#include <stdio.h>
70#include <stdlib.h>
71#include <string.h>
72#include <unistd.h>
73#include <utmp.h>
74#include <vis.h>
75
76#include <arpa/nameser.h>
77#include <resolv.h>
78
79#include "extern.h"
80
81struct timeval boottime;
82struct utmp utmp;
83struct winsize ws;
84kvm_t *kd;
85time_t now; /* the current time of day */
86time_t uptime; /* time of last reboot & elapsed time since */
87int ttywidth; /* width of tty */
88int argwidth; /* width of tty */
89int header = 1; /* true if -h flag: don't print heading */
90int nflag; /* true if -n flag: don't convert addrs */
91int dflag; /* true if -d flag: output debug info */
92int sortidle; /* sort by idle time */
93int use_ampm; /* use AM/PM time */
94int use_comma; /* use comma as floats separator */
95char **sel_users; /* login array of particular users selected */
96char domain[MAXHOSTNAMELEN];
97
98/*
99 * One of these per active utmp entry.
100 */
101struct entry {
102 struct entry *next;
103 struct utmp utmp;
104 dev_t tdev; /* dev_t of terminal */
105 time_t idle; /* idle time of terminal in seconds */
106 struct kinfo_proc *kp; /* `most interesting' proc */
107 char *args; /* arg list of interesting process */
108 struct kinfo_proc *dkp; /* debug option proc list */
109} *ep, *ehead = NULL, **nextp = &ehead;
110
5dfd06ac 111#define debugproc(p) *((struct kinfo_proc **)&(p)->kp_spare[0])
984263bc 112
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113static void pr_header(time_t *, int);
114static struct stat *ttystat(char *, int);
115static void usage(int);
116static int this_is_uptime(const char *s);
984263bc 117
1d1731fa 118char *fmt_argv(char **, char *, int); /* ../../bin/ps/fmt.c */
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119
120int
1d1731fa 121main(int argc, char **argv)
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122{
123 struct kinfo_proc *kp;
124 struct kinfo_proc *dkp;
125 struct hostent *hp;
126 struct stat *stp;
127 FILE *ut;
128 in_addr_t l;
129 time_t touched;
130 int ch, i, nentries, nusers, wcmd, longidle, dropgid;
131 char *memf, *nlistf, *p, *x;
132 char buf[MAXHOSTNAMELEN], errbuf[_POSIX2_LINE_MAX];
133
134 (void)setlocale(LC_ALL, "");
135 use_ampm = (*nl_langinfo(T_FMT_AMPM) != '\0');
136 use_comma = (*nl_langinfo(RADIXCHAR) != ',');
137
138 /* Are we w(1) or uptime(1)? */
139 if (this_is_uptime(argv[0]) == 0) {
140 wcmd = 0;
141 p = "";
142 } else {
143 wcmd = 1;
144 p = "dhiflM:N:nsuw";
145 }
146
147 dropgid = 0;
148 memf = nlistf = _PATH_DEVNULL;
149 while ((ch = getopt(argc, argv, p)) != -1)
150 switch (ch) {
151 case 'd':
152 dflag = 1;
153 break;
154 case 'h':
155 header = 0;
156 break;
157 case 'i':
158 sortidle = 1;
159 break;
160 case 'M':
161 header = 0;
162 memf = optarg;
163 dropgid = 1;
164 break;
165 case 'N':
166 nlistf = optarg;
167 dropgid = 1;
168 break;
169 case 'n':
170 nflag = 1;
171 break;
172 case 'f': case 'l': case 's': case 'u': case 'w':
173 warnx("[-flsuw] no longer supported");
174 /* FALLTHROUGH */
175 case '?':
176 default:
177 usage(wcmd);
178 }
179 argc -= optind;
180 argv += optind;
181
182 if (!(_res.options & RES_INIT))
183 res_init();
184 _res.retrans = 2; /* resolver timeout to 2 seconds per try */
185 _res.retry = 1; /* only try once.. */
186
187 /*
188 * Discard setgid privileges if not the running kernel so that bad
189 * guys can't print interesting stuff from kernel memory.
190 */
191 if (dropgid)
192 setgid(getgid());
193
194 if ((kd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, errbuf)) == NULL)
195 errx(1, "%s", errbuf);
196
197 (void)time(&now);
198 if ((ut = fopen(_PATH_UTMP, "r")) == NULL)
199 err(1, "%s", _PATH_UTMP);
200
201 if (*argv)
202 sel_users = argv;
203
204 for (nusers = 0; fread(&utmp, sizeof(utmp), 1, ut);) {
205 if (utmp.ut_name[0] == '\0')
206 continue;
207 if (!(stp = ttystat(utmp.ut_line, UT_LINESIZE)))
208 continue; /* corrupted record */
209 ++nusers;
210 if (wcmd == 0)
211 continue;
212 if (sel_users) {
213 int usermatch;
214 char **user;
215
216 usermatch = 0;
217 for (user = sel_users; !usermatch && *user; user++)
218 if (!strncmp(utmp.ut_name, *user, UT_NAMESIZE))
219 usermatch = 1;
220 if (!usermatch)
221 continue;
222 }
223 if ((ep = calloc(1, sizeof(struct entry))) == NULL)
224 errx(1, "calloc");
225 *nextp = ep;
226 nextp = &ep->next;
227 memmove(&ep->utmp, &utmp, sizeof(struct utmp));
228 ep->tdev = stp->st_rdev;
229#ifdef CPU_CONSDEV
230 /*
231 * If this is the console device, attempt to ascertain
232 * the true console device dev_t.
233 */
234 if (ep->tdev == 0) {
235 int mib[2];
236 size_t size;
237
238 mib[0] = CTL_MACHDEP;
239 mib[1] = CPU_CONSDEV;
240 size = sizeof(dev_t);
241 (void)sysctl(mib, 2, &ep->tdev, &size, NULL, 0);
242 }
243#endif
244 touched = stp->st_atime;
245 if (touched < ep->utmp.ut_time) {
246 /* tty untouched since before login */
247 touched = ep->utmp.ut_time;
248 }
249 if ((ep->idle = now - touched) < 0)
250 ep->idle = 0;
251 }
252 (void)fclose(ut);
253
254 if (header || wcmd == 0) {
255 pr_header(&now, nusers);
256 if (wcmd == 0) {
257 (void)kvm_close(kd);
258 exit(0);
259 }
260
261#define HEADER_USER "USER"
262#define HEADER_TTY "TTY"
263#define HEADER_FROM "FROM"
264#define HEADER_LOGIN_IDLE "LOGIN@ IDLE "
265#define HEADER_WHAT "WHAT\n"
266#define WUSED (UT_NAMESIZE + UT_LINESIZE + UT_HOSTSIZE + \
267 sizeof(HEADER_LOGIN_IDLE) + 3) /* header width incl. spaces */
268 (void)printf("%-*.*s %-*.*s %-*.*s %s",
269 UT_NAMESIZE, UT_NAMESIZE, HEADER_USER,
270 UT_LINESIZE, UT_LINESIZE, HEADER_TTY,
271 UT_HOSTSIZE, UT_HOSTSIZE, HEADER_FROM,
272 HEADER_LOGIN_IDLE HEADER_WHAT);
273 }
274
275 if ((kp = kvm_getprocs(kd, KERN_PROC_ALL, 0, &nentries)) == NULL)
276 err(1, "%s", kvm_geterr(kd));
277 for (i = 0; i < nentries; i++, kp++) {
416d05d7 278 if (kp->kp_stat == SIDL || kp->kp_stat == SZOMB)
984263bc 279 continue;
984263bc 280 for (ep = ehead; ep != NULL; ep = ep->next) {
5dfd06ac 281 if (ep->tdev == kp->kp_tdev) {
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282 /*
283 * proc is associated with this terminal
284 */
5dfd06ac 285 if (ep->kp == NULL && kp->kp_pgid == kp->kp_tpgid) {
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286 /*
287 * Proc is 'most interesting'
288 */
5dfd06ac 289 if (proc_compare(ep->kp, kp))
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290 ep->kp = kp;
291 }
292 /*
293 * Proc debug option info; add to debug
294 * list using kinfo_proc kp_eproc.e_spare
295 * as next pointer; ptr to ptr avoids the
296 * ptr = long assumption.
297 */
298 dkp = ep->dkp;
299 ep->dkp = kp;
300 debugproc(kp) = dkp;
301 }
302 }
303 }
304 if ((ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == -1 &&
305 ioctl(STDERR_FILENO, TIOCGWINSZ, &ws) == -1 &&
306 ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) == -1) || ws.ws_col == 0)
307 ttywidth = 79;
308 else
309 ttywidth = ws.ws_col - 1;
310 argwidth = ttywidth - WUSED;
311 if (argwidth < 4)
312 argwidth = 8;
313 for (ep = ehead; ep != NULL; ep = ep->next) {
314 if (ep->kp == NULL) {
315 ep->args = "-";
316 continue;
317 }
318 ep->args = fmt_argv(kvm_getargv(kd, ep->kp, argwidth),
5dfd06ac 319 ep->kp->kp_comm, MAXCOMLEN);
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320 if (ep->args == NULL)
321 err(1, NULL);
322 }
323 /* sort by idle time */
324 if (sortidle && ehead != NULL) {
325 struct entry *from, *save;
326
327 from = ehead;
328 ehead = NULL;
329 while (from != NULL) {
330 for (nextp = &ehead;
331 (*nextp) && from->idle >= (*nextp)->idle;
332 nextp = &(*nextp)->next)
333 continue;
334 save = from;
335 from = from->next;
336 save->next = *nextp;
337 *nextp = save;
338 }
339 }
340
341 if (!nflag) {
ca76ab12 342 if (gethostname(domain, sizeof(domain)) < 0 ||
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343 (p = strchr(domain, '.')) == NULL)
344 domain[0] = '\0';
345 else {
346 domain[sizeof(domain) - 1] = '\0';
347 memmove(domain, p, strlen(p) + 1);
348 }
349 }
350
351 for (ep = ehead; ep != NULL; ep = ep->next) {
352 char host_buf[UT_HOSTSIZE + 1];
353
354 host_buf[UT_HOSTSIZE] = '\0';
355 strncpy(host_buf, ep->utmp.ut_host, UT_HOSTSIZE);
356 p = *host_buf ? host_buf : "-";
357 if ((x = strchr(p, ':')) != NULL)
358 *x++ = '\0';
359 if (!nflag && isdigit(*p) && (l = inet_addr(p)) != -1 &&
15b85273 360 (hp = gethostbyaddr(&l, sizeof(l), AF_INET))) {
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361 if (domain[0] != '\0') {
362 p = hp->h_name;
363 p += strlen(hp->h_name);
364 p -= strlen(domain);
365 if (p > hp->h_name &&
366 strcasecmp(p, domain) == 0)
367 *p = '\0';
368 }
369 p = hp->h_name;
370 }
371 if (nflag && *p && strcmp(p, "-") &&
372 inet_addr(p) == INADDR_NONE) {
373 hp = gethostbyname(p);
374
375 if (hp != NULL) {
376 struct in_addr in;
377
378 memmove(&in, hp->h_addr, sizeof(in));
379 p = inet_ntoa(in);
380 }
381 }
382 if (x) {
383 (void)snprintf(buf, sizeof(buf), "%s:%s", p, x);
384 p = buf;
385 }
386 if (dflag) {
387 for (dkp = ep->dkp; dkp != NULL; dkp = debugproc(dkp)) {
388 char *ptr;
389
390 ptr = fmt_argv(kvm_getargv(kd, dkp, argwidth),
5dfd06ac 391 dkp->kp_comm, MAXCOMLEN);
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392 if (ptr == NULL)
393 ptr = "-";
394 (void)printf("\t\t%-9d %s\n",
5dfd06ac 395 dkp->kp_pid, ptr);
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396 }
397 }
398 (void)printf("%-*.*s %-*.*s %-*.*s ",
399 UT_NAMESIZE, UT_NAMESIZE, ep->utmp.ut_name,
400 UT_LINESIZE, UT_LINESIZE,
401 strncmp(ep->utmp.ut_line, "tty", 3) &&
402 strncmp(ep->utmp.ut_line, "cua", 3) ?
403 ep->utmp.ut_line : ep->utmp.ut_line + 3,
404 UT_HOSTSIZE, UT_HOSTSIZE, *p ? p : "-");
405 pr_attime(&ep->utmp.ut_time, &now);
406 longidle = pr_idle(ep->idle);
407 (void)printf("%.*s\n", argwidth - longidle, ep->args);
408 }
409 (void)kvm_close(kd);
410 exit(0);
411}
412
413static void
1d1731fa 414pr_header(time_t *nowp, int nusers)
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415{
416 double avenrun[3];
417 time_t uptime;
418 int days, hrs, i, mins, secs;
419 int mib[2];
420 size_t size;
421 char buf[256];
422
423 /*
424 * Print time of day.
425 */
426 (void)strftime(buf, sizeof(buf) - 1,
427 use_ampm ? "%l:%M%p" : "%k:%M", localtime(nowp));
428 buf[sizeof(buf) - 1] = '\0';
429 (void)printf("%s ", buf);
430
431 /*
432 * Print how long system has been up.
09bf16f5 433 * (Found by looking at "boottime" from the kernel)
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434 */
435 mib[0] = CTL_KERN;
436 mib[1] = KERN_BOOTTIME;
437 size = sizeof(boottime);
438 if (sysctl(mib, 2, &boottime, &size, NULL, 0) != -1 &&
439 boottime.tv_sec != 0) {
440 uptime = now - boottime.tv_sec;
441 if (uptime > 60)
442 uptime += 30;
443 days = uptime / 86400;
444 uptime %= 86400;
445 hrs = uptime / 3600;
446 uptime %= 3600;
447 mins = uptime / 60;
448 secs = uptime % 60;
449 (void)printf(" up");
450 if (days > 0)
451 (void)printf(" %d day%s,", days, days > 1 ? "s" : "");
452 if (hrs > 0 && mins > 0)
453 (void)printf(" %2d:%02d,", hrs, mins);
454 else if (hrs > 0)
455 (void)printf(" %d hr%s,", hrs, hrs > 1 ? "s" : "");
456 else if (mins > 0)
457 (void)printf(" %d min%s,", mins, mins > 1 ? "s" : "");
458 else
459 (void)printf(" %d sec%s,", secs, secs > 1 ? "s" : "");
460 }
461
09bf16f5 462 /* Print number of users logged in on system */
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463 (void)printf(" %d user%s", nusers, nusers == 1 ? "" : "s");
464
465 /*
466 * Print 1, 5, and 15 minute load averages.
467 */
468 if (getloadavg(avenrun, sizeof(avenrun) / sizeof(avenrun[0])) == -1)
469 (void)printf(", no load average information available\n");
470 else {
471 (void)printf(", load averages:");
472 for (i = 0; i < (sizeof(avenrun) / sizeof(avenrun[0])); i++) {
473 if (use_comma && i > 0)
474 (void)printf(",");
475 (void)printf(" %.2f", avenrun[i]);
476 }
477 (void)printf("\n");
478 }
479}
480
481static struct stat *
1d1731fa 482ttystat(char *line, int sz)
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483{
484 static struct stat sb;
485 char ttybuf[MAXPATHLEN];
486
487 (void)snprintf(ttybuf, sizeof(ttybuf), "%s%.*s", _PATH_DEV, sz, line);
488 if (stat(ttybuf, &sb)) {
489 warn("%s", ttybuf);
490 return (NULL);
491 }
492 return (&sb);
493}
494
495static void
1d1731fa 496usage(int wcmd)
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497{
498 if (wcmd)
499 (void)fprintf(stderr,
500 "usage: w [-dhin] [-M core] [-N system] [user ...]\n");
501 else
502 (void)fprintf(stderr, "usage: uptime\n");
503 exit(1);
504}
505
506static int
1d1731fa 507this_is_uptime(const char *s)
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508{
509 const char *u;
510
511 if ((u = strrchr(s, '/')) != NULL)
512 ++u;
513 else
514 u = s;
515 if (strcmp(u, "uptime") == 0)
516 return (0);
517 return (-1);
518}