275 lines
6.3 KiB
C
275 lines
6.3 KiB
C
/* $NetBSD: who.c,v 1.8 1999/07/17 16:41:44 christos Exp $ */
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/*
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* Copyright (c) 1989, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Michael Fischbein.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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__COPYRIGHT(
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"@(#) Copyright (c) 1989, 1993\n\
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The Regents of the University of California. All rights reserved.\n");
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#endif /* not lint */
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)who.c 8.1 (Berkeley) 6/6/93";
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#endif
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__RCSID("$NetBSD: who.c,v 1.8 1999/07/17 16:41:44 christos Exp $");
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#endif /* not lint */
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <err.h>
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#include <locale.h>
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#include <pwd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <unistd.h>
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#include <utmp.h>
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void output __P((struct utmp *));
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void output_labels __P((void));
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void who_am_i __P((FILE *));
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FILE *file __P((char *));
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void usage __P((void));
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int show_term; /* show term state */
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int show_idle; /* show idle time */
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int main __P((int, char **));
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int
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main(argc, argv)
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int argc;
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char **argv;
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{
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struct utmp usr;
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FILE *ufp;
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int c, only_current_term, show_labels;
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setlocale(LC_ALL, "");
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only_current_term = show_term = show_idle = show_labels = 0;
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while ((c = getopt(argc, argv, "mTuH")) != -1) {
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switch (c) {
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case 'm':
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only_current_term = 1;
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break;
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case 'T':
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show_term = 1;
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break;
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case 'u':
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show_idle = 1;
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break;
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case 'H':
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show_labels = 1;
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break;
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default:
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usage();
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/* NOTREACHED */
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}
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}
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argc -= optind;
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argv += optind;
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if (chdir("/dev")) {
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err(1, "cannot change directory to /dev");
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/* NOTREACHED */
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}
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if (show_labels)
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output_labels();
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switch (argc) {
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case 0: /* who */
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ufp = file(_PATH_UTMP);
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if (only_current_term) {
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who_am_i(ufp);
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} else {
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/* only entries with both name and line fields */
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while (fread((char *)&usr, sizeof(usr), 1, ufp) == 1)
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if (*usr.ut_name && *usr.ut_line)
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output(&usr);
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}
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break;
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case 1: /* who utmp_file */
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ufp = file(*argv);
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if (only_current_term) {
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who_am_i(ufp);
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} else {
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/* all entries */
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while (fread((char *)&usr, sizeof(usr), 1, ufp) == 1)
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output(&usr);
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}
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break;
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case 2: /* who am i */
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ufp = file(_PATH_UTMP);
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who_am_i(ufp);
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break;
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default:
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usage();
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/* NOTREACHED */
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}
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exit(0);
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}
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void
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who_am_i(ufp)
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FILE *ufp;
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{
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struct utmp usr;
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struct passwd *pw;
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char *p;
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char *t;
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/* search through the utmp and find an entry for this tty */
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if ((p = ttyname(0)) != NULL) {
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/* strip any directory component */
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if ((t = strrchr(p, '/')) != NULL)
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p = t + 1;
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while (fread((char *)&usr, sizeof(usr), 1, ufp) == 1)
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if (usr.ut_name[0] != '\0' &&
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!strcmp(usr.ut_line, p)) {
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output(&usr);
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return;
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}
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/* well, at least we know what the tty is */
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(void)strncpy(usr.ut_line, p, UT_LINESIZE);
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} else
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(void)strcpy(usr.ut_line, "tty??");
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pw = getpwuid(getuid());
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(void)strncpy(usr.ut_name, pw ? pw->pw_name : "?", UT_NAMESIZE);
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(void)time(&usr.ut_time);
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*usr.ut_host = '\0';
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output(&usr);
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}
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void
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output(up)
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struct utmp *up;
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{
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struct stat sb;
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char line[sizeof (up->ut_line) + 1];
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char state;
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static time_t now = 0;
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time_t idle;
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state = '?';
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idle = 0;
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if (show_term || show_idle) {
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if (now == 0)
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time(&now);
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strncpy(line, up->ut_line, sizeof (up->ut_line));
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line[sizeof (up->ut_line)] = '\0';
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if (stat(line, &sb) == 0) {
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state = (sb.st_mode & 020) ? '+' : '-';
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idle = now - sb.st_atime;
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}
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}
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(void)printf("%-*.*s ", (int)UT_NAMESIZE, (int)UT_NAMESIZE, up->ut_name);
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if (show_term) {
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(void)printf("%c ", state);
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}
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(void)printf("%-*.*s ", (int)UT_LINESIZE, (int)UT_LINESIZE, up->ut_line);
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(void)printf("%.12s ", ctime(&up->ut_time) + 4);
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if (show_idle) {
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if (idle < 60)
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(void)printf(" . ");
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else if (idle < (24 * 60 * 60))
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(void)printf("%02ld:%02ld ",
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(long)(idle / (60 * 60)),
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(long)(idle % (60 * 60)) / 60);
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else
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(void)printf(" old ");
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}
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if (*up->ut_host)
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printf("\t(%.*s)", (int)UT_HOSTSIZE, up->ut_host);
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(void)putchar('\n');
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}
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void
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output_labels()
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{
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(void)printf("%-*.*s ", (int)UT_NAMESIZE, (int)UT_NAMESIZE, "USER");
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if (show_term)
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(void)printf("S ");
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(void)printf("%-*.*s ", (int)UT_LINESIZE, (int)UT_LINESIZE, "LINE");
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(void)printf("WHEN ");
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if (show_idle)
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(void)printf("IDLE ");
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(void)printf("\t%.*s", (int)UT_HOSTSIZE, "FROM");
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(void)putchar('\n');
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}
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FILE *
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file(name)
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char *name;
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{
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FILE *ufp;
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if (!(ufp = fopen(name, "r"))) {
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err(1, "%s", name);
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/* NOTREACHED */
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}
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return (ufp);
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}
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void
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usage()
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{
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(void)fprintf(stderr, "usage: who [-mTuH] [ file ]\n who am i\n");
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exit(1);
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}
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