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w.c revision 1.17 
      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
     35 static 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
     41 static 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 
     82 struct timeval	boottime;
     83 struct utmp	utmp;
     84 struct winsize	ws;
     85 kvm_t	       *kd;
     86 time_t		now;		/* the current time of day */
     87 time_t		uptime;		/* time of last reboot & elapsed time since */
     88 int		ttywidth;	/* width of tty */
     89 int		argwidth;	/* width of tty */
     90 int		header = 1;	/* true if -h flag: don't print heading */
     91 int		nflag;		/* true if -n flag: don't convert addrs */
     92 int		sortidle;	/* sort bu idle time */
     93 char	       *sel_user;	/* login of particular user selected */
     94 char		domain[MAXHOSTNAMELEN];
     95 
     96 /*
     97  * One of these per active utmp entry.
     98  */
     99 struct	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 } *ep, *ehead = NULL, **nextp = &ehead;
    106 
    107 static void	 pr_args __P((struct kinfo_proc *));
    108 static void	 pr_header __P((time_t *, int));
    109 static struct stat
    110 		*ttystat __P((char *));
    111 static void	 usage __P((int));
    112 
    113 int
    114 main(argc, argv)
    115 	int argc;
    116 	char **argv;
    117 {
    118 	extern char *__progname;
    119 	struct kinfo_proc *kp;
    120 	struct hostent *hp;
    121 	struct stat *stp;
    122 	FILE *ut;
    123 	u_long l;
    124 	int ch, i, nentries, nusers, wcmd;
    125 	char *memf, *nlistf, *p, *x;
    126 	char buf[MAXHOSTNAMELEN], errbuf[256];
    127 
    128 	/* Are we w(1) or uptime(1)? */
    129 	p = __progname;
    130 	if (*p == '-')
    131 		p++;
    132 	if (*p == 'u') {
    133 		wcmd = 0;
    134 		p = "";
    135 	} else {
    136 		wcmd = 1;
    137 		p = "hiflM:N:nsuw";
    138 	}
    139 
    140 	memf = nlistf = NULL;
    141 	while ((ch = getopt(argc, argv, p)) != EOF)
    142 		switch (ch) {
    143 		case 'h':
    144 			header = 0;
    145 			break;
    146 		case 'i':
    147 			sortidle = 1;
    148 			break;
    149 		case 'M':
    150 			header = 0;
    151 			memf = optarg;
    152 			break;
    153 		case 'N':
    154 			nlistf = optarg;
    155 			break;
    156 		case 'n':
    157 			nflag = 1;
    158 			break;
    159 		case 'f': case 'l': case 's': case 'u': case 'w':
    160 			warnx("[-flsuw] no longer supported");
    161 			/* FALLTHROUGH */
    162 		case '?':
    163 		default:
    164 			usage(wcmd);
    165 		}
    166 	argc -= optind;
    167 	argv += optind;
    168 
    169 	if ((kd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, errbuf)) == NULL)
    170 		errx(1, "%s", errbuf);
    171 
    172 	(void)time(&now);
    173 	if ((ut = fopen(_PATH_UTMP, "r")) == NULL)
    174 		err(1, "%s", _PATH_UTMP);
    175 
    176 	if (*argv)
    177 		sel_user = *argv;
    178 
    179 	for (nusers = 0; fread(&utmp, sizeof(utmp), 1, ut);) {
    180 		if (utmp.ut_name[0] == '\0')
    181 			continue;
    182 		++nusers;
    183 		if (wcmd == 0 || (sel_user &&
    184 		    strncmp(utmp.ut_name, sel_user, UT_NAMESIZE) != 0))
    185 			continue;
    186 		if ((ep = calloc(1, sizeof(struct entry))) == NULL)
    187 			err(1, NULL);
    188 		*nextp = ep;
    189 		nextp = &(ep->next);
    190 		memmove(&(ep->utmp), &utmp, sizeof(struct utmp));
    191 		if (!(stp = ttystat(ep->utmp.ut_line)))
    192 			continue;
    193 		ep->tdev = stp->st_rdev;
    194 #ifdef CPU_CONSDEV
    195 		/*
    196 		 * If this is the console device, attempt to ascertain
    197 		 * the true console device dev_t.
    198 		 */
    199 		if (ep->tdev == 0) {
    200 			int mib[2];
    201 			size_t size;
    202 
    203 			mib[0] = CTL_MACHDEP;
    204 			mib[1] = CPU_CONSDEV;
    205 			size = sizeof(dev_t);
    206 			(void) sysctl(mib, 2, &ep->tdev, &size, NULL, 0);
    207 		}
    208 #endif
    209 		if ((ep->idle = now - stp->st_atime) < 0)
    210 			ep->idle = 0;
    211 	}
    212 	(void)fclose(ut);
    213 
    214 	if (header || wcmd == 0) {
    215 		pr_header(&now, nusers);
    216 		if (wcmd == 0)
    217 			exit (0);
    218 	}
    219 
    220 #define HEADER	"USER    TTY FROM              LOGIN@  IDLE WHAT\n"
    221 #define WUSED	(sizeof (HEADER) - sizeof ("WHAT\n"))
    222 	(void)printf(HEADER);
    223 
    224 	if ((kp = kvm_getprocs(kd, KERN_PROC_ALL, 0, &nentries)) == NULL)
    225 		errx(1, "%s", kvm_geterr(kd));
    226 	for (i = 0; i < nentries; i++, kp++) {
    227 		struct proc *p = &kp->kp_proc;
    228 		struct eproc *e;
    229 
    230 		if (p->p_stat == SIDL || p->p_stat == SZOMB)
    231 			continue;
    232 		e = &kp->kp_eproc;
    233 		for (ep = ehead; ep != NULL; ep = ep->next) {
    234 			if (ep->tdev == e->e_tdev && e->e_pgid == e->e_tpgid) {
    235 				/*
    236 				 * Proc is in foreground of this terminal
    237 				 */
    238 				if (proc_compare(&ep->kp->kp_proc, p))
    239 					ep->kp = kp;
    240 				break;
    241 			}
    242 		}
    243 	}
    244 	if ((ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == -1 &&
    245 	     ioctl(STDERR_FILENO, TIOCGWINSZ, &ws) == -1 &&
    246 	     ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) == -1) || ws.ws_col == 0)
    247 	       ttywidth = 79;
    248         else
    249 	       ttywidth = ws.ws_col - 1;
    250 	argwidth = ttywidth - WUSED;
    251 	if (argwidth < 4)
    252 		argwidth = 8;
    253 	/* sort by idle time */
    254 	if (sortidle && ehead != NULL) {
    255 		struct entry *from = ehead, *save;
    256 
    257 		ehead = NULL;
    258 		while (from != NULL) {
    259 			for (nextp = &ehead;
    260 			    (*nextp) && from->idle >= (*nextp)->idle;
    261 			    nextp = &(*nextp)->next)
    262 				continue;
    263 			save = from;
    264 			from = from->next;
    265 			save->next = *nextp;
    266 			*nextp = save;
    267 		}
    268 	}
    269 
    270 	if (!nflag)
    271 		if (gethostname(domain, sizeof(domain) - 1) < 0 ||
    272 		    (p = strchr(domain, '.')) == 0)
    273 			domain[0] = '\0';
    274 		else {
    275 			domain[sizeof(domain) - 1] = '\0';
    276 			memmove(domain, p, strlen(p) + 1);
    277 		}
    278 
    279 	for (ep = ehead; ep != NULL; ep = ep->next) {
    280 		p = *ep->utmp.ut_host ? ep->utmp.ut_host : "-";
    281 		if ((x = strchr(p, ':')) != NULL)
    282 			*x++ = '\0';
    283 		if (!nflag && isdigit(*p) &&
    284 		    (long)(l = inet_addr(p)) != -1 &&
    285 		    (hp = gethostbyaddr((char *)&l, sizeof(l), AF_INET))) {
    286 			if (domain[0] != '\0') {
    287 				p = hp->h_name;
    288 				p += strlen(hp->h_name);
    289 				p -= strlen(domain);
    290 				if (p > hp->h_name && strcmp(p, domain) == 0)
    291 					*p = '\0';
    292 			}
    293 			p = hp->h_name;
    294 		}
    295 		if (x) {
    296 			(void)snprintf(buf, sizeof(buf), "%s:%.*s", p,
    297 			    ep->utmp.ut_host + UT_HOSTSIZE - x, x);
    298 			p = buf;
    299 		}
    300 		(void)printf("%-*.*s %-2.2s %-*.*s ",
    301 		    UT_NAMESIZE, UT_NAMESIZE, ep->utmp.ut_name,
    302 		    strncmp(ep->utmp.ut_line, "tty", 3) ?
    303 		    ep->utmp.ut_line : ep->utmp.ut_line + 3,
    304 		    UT_HOSTSIZE, UT_HOSTSIZE, *p ? p : "-");
    305 		pr_attime(&ep->utmp.ut_time, &now);
    306 		pr_idle(ep->idle);
    307 		pr_args(ep->kp);
    308 		printf("\n");
    309 	}
    310 	exit(0);
    311 }
    312 
    313 static void
    314 pr_args(kp)
    315 	struct kinfo_proc *kp;
    316 {
    317 	char **argv;
    318 	int left;
    319 
    320 	if (kp == 0)
    321 		goto nothing;
    322 	left = argwidth;
    323 	argv = kvm_getargv(kd, kp, argwidth);
    324 	if (argv == 0)
    325 		goto nothing;
    326 	while (*argv) {
    327 		fmt_puts(*argv, &left);
    328 		argv++;
    329 		fmt_putc(' ', &left);
    330 	}
    331 	return;
    332 nothing:
    333 	putchar('-');
    334 }
    335 
    336 static void
    337 pr_header(nowp, nusers)
    338 	time_t *nowp;
    339 	int nusers;
    340 {
    341 	double avenrun[3];
    342 	time_t uptime;
    343 	int days, hrs, i, mins;
    344 	int mib[2];
    345 	size_t size;
    346 	char buf[256];
    347 
    348 	/*
    349 	 * Print time of day.
    350 	 *
    351 	 * SCCS forces the string manipulation below, as it replaces
    352 	 * %, M, and % in a character string with the file name.
    353 	 */
    354 	(void)strftime(buf, sizeof(buf),
    355 	    __CONCAT("%l:%","M%p"), localtime(nowp));
    356 	(void)printf("%s ", buf);
    357 
    358 	/*
    359 	 * Print how long system has been up.
    360 	 * (Found by looking getting "boottime" from the kernel)
    361 	 */
    362 	mib[0] = CTL_KERN;
    363 	mib[1] = KERN_BOOTTIME;
    364 	size = sizeof(boottime);
    365 	if (sysctl(mib, 2, &boottime, &size, NULL, 0) != -1 &&
    366 	    boottime.tv_sec != 0) {
    367 		uptime = now - boottime.tv_sec;
    368 		uptime += 30;
    369 		days = uptime / SECSPERDAY;
    370 		uptime %= SECSPERDAY;
    371 		hrs = uptime / SECSPERHOUR;
    372 		uptime %= SECSPERHOUR;
    373 		mins = uptime / SECSPERMIN;
    374 		(void)printf(" up");
    375 		if (days > 0)
    376 			(void)printf(" %d day%s,", days, days > 1 ? "s" : "");
    377 		if (hrs > 0 && mins > 0)
    378 			(void)printf(" %2d:%02d,", hrs, mins);
    379 		else {
    380 			if (hrs > 0)
    381 				(void)printf(" %d hr%s,",
    382 				    hrs, hrs > 1 ? "s" : "");
    383 			if (mins > 0)
    384 				(void)printf(" %d min%s,",
    385 				    mins, mins > 1 ? "s" : "");
    386 		}
    387 	}
    388 
    389 	/* Print number of users logged in to system */
    390 	(void)printf(" %d user%s", nusers, nusers != 1 ? "s" : "");
    391 
    392 	/*
    393 	 * Print 1, 5, and 15 minute load averages.
    394 	 */
    395 	if (getloadavg(avenrun, sizeof(avenrun) / sizeof(avenrun[0])) == -1)
    396 		(void)printf(", no load average information available\n");
    397 	else {
    398 		(void)printf(", load averages:");
    399 		for (i = 0; i < (sizeof(avenrun) / sizeof(avenrun[0])); i++) {
    400 			if (i > 0)
    401 				(void)printf(",");
    402 			(void)printf(" %.2f", avenrun[i]);
    403 		}
    404 		(void)printf("\n");
    405 	}
    406 }
    407 
    408 static struct stat *
    409 ttystat(line)
    410 	char *line;
    411 {
    412 	static struct stat sb;
    413 	char ttybuf[MAXPATHLEN];
    414 
    415 	(void)snprintf(ttybuf, sizeof(ttybuf), "%s/%s", _PATH_DEV, line);
    416 	if (stat(ttybuf, &sb))
    417 		return (NULL);
    418 	return (&sb);
    419 }
    420 
    421 static void
    422 usage(wcmd)
    423 	int wcmd;
    424 {
    425 	if (wcmd)
    426 		(void)fprintf(stderr,
    427 		    "usage: w: [-hin] [-M core] [-N system] [user]\n");
    428 	else
    429 		(void)fprintf(stderr, "uptime\n");
    430 	exit (1);
    431 }
    432