NetBSD/usr.bin/who/who.c

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/* $NetBSD: who.c,v 1.10 2002/08/01 23:23:09 christos Exp $ */
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/*
* Copyright (c) 1989, 1993
* The Regents of the University of California. All rights reserved.
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*
* This code is derived from software contributed to Berkeley by
* Michael Fischbein.
*
* 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.
*/
#include <sys/cdefs.h>
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#ifndef lint
__COPYRIGHT(
"@(#) Copyright (c) 1989, 1993\n\
The Regents of the University of California. All rights reserved.\n");
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#endif /* not lint */
#ifndef lint
#if 0
static char sccsid[] = "@(#)who.c 8.1 (Berkeley) 6/6/93";
#endif
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__RCSID("$NetBSD: who.c,v 1.10 2002/08/01 23:23:09 christos Exp $");
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#endif /* not lint */
#include <sys/types.h>
#include <sys/stat.h>
#include <err.h>
#include <locale.h>
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#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
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#include "utmpentry.h"
static void output_labels(void);
static void who_am_i(const char *, int);
static void usage(void);
static void process(const char *, int);
static void print(const char *, const char *, time_t, const char *);
int main(int, char **);
static int show_term; /* show term state */
static int show_idle; /* show idle time */
static int maxname = 8, maxline = 8, maxhost = 16;
int
main(int argc, char **argv)
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{
int c, only_current_term, show_labels;
setlocale(LC_ALL, "");
only_current_term = show_term = show_idle = show_labels = 0;
while ((c = getopt(argc, argv, "mTuH")) != -1) {
switch (c) {
case 'm':
only_current_term = 1;
break;
case 'T':
show_term = 1;
break;
case 'u':
show_idle = 1;
break;
case 'H':
show_labels = 1;
break;
default:
usage();
/* NOTREACHED */
}
}
argc -= optind;
argv += optind;
if (chdir("/dev")) {
err(1, "cannot change directory to /dev");
/* NOTREACHED */
}
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switch (argc) {
case 0: /* who */
if (only_current_term) {
who_am_i(NULL, show_labels);
} else {
process(NULL, show_labels);
}
break;
case 1: /* who utmp_file */
if (only_current_term) {
who_am_i(*argv, show_labels);
} else {
process(*argv, show_labels);
}
break;
case 2: /* who am i */
who_am_i(NULL, show_labels);
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break;
default:
usage();
/* NOTREACHED */
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}
exit(0);
}
static void
who_am_i(const char *fname, int show_labels)
{
struct passwd *pw;
char *p;
char *t;
time_t now;
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struct utmpentry *ehead, *ep;
/* search through the utmp and find an entry for this tty */
if ((p = ttyname(STDIN_FILENO)) != NULL) {
/* strip any directory component */
if ((t = strrchr(p, '/')) != NULL)
p = t + 1;
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(void)getutentries(fname, &ehead);
for (ep = ehead; ep; ep = ep->next)
if (strcmp(ep->line, p) == 0) {
if (show_labels)
output_labels();
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print(ep->name, ep->line, (time_t)ep->tv.tv_sec,
ep->host);
return;
}
} else
p = "tty??";
(void)time(&now);
pw = getpwuid(getuid());
if (show_labels)
output_labels();
print(pw ? pw->pw_name : "?", p, now, "");
}
static void
process(const char *fname, int show_labels)
{
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struct utmpentry *ehead, *ep;
(void)getutentries(fname, &ehead);
if (show_labels)
output_labels();
for (ep = ehead; ep != NULL; ep = ep->next)
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print(ep->name, ep->line, (time_t)ep->tv.tv_sec, ep->host);
}
static void
print(const char *name, const char *line, time_t t, const char *host)
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{
struct stat sb;
char state;
static time_t now = 0;
time_t idle;
state = '?';
idle = 0;
if (show_term || show_idle) {
if (now == 0)
time(&now);
if (stat(line, &sb) == 0) {
state = (sb.st_mode & 020) ? '+' : '-';
idle = now - sb.st_atime;
}
}
(void)printf("%-*.*s ", maxname, maxname, name);
if (show_term) {
(void)printf("%c ", state);
}
(void)printf("%-*.*s ", maxline, maxline, line);
(void)printf("%.12s ", ctime(&t) + 4);
if (show_idle) {
if (idle < 60)
(void)printf(" . ");
else if (idle < (24 * 60 * 60))
(void)printf("%02ld:%02ld ",
(long)(idle / (60 * 60)),
(long)(idle % (60 * 60)) / 60);
else
(void)printf(" old ");
}
if (*host)
printf("\t(%.*s)", maxhost, host);
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(void)putchar('\n');
}
static void
output_labels()
{
(void)printf("%-*.*s ", maxname, maxname, "USER");
if (show_term)
(void)printf("S ");
(void)printf("%-*.*s ", maxline, maxline, "LINE");
(void)printf("WHEN ");
if (show_idle)
(void)printf("IDLE ");
(void)printf("\t%.*s", maxhost, "FROM");
(void)putchar('\n');
}
static void
usage()
{
(void)fprintf(stderr, "Usage: %s [-mTuH] [ file ]\n %s am i\n",
getprogname(), getprogname());
exit(1);
}