Added code for POSIX.2's -m, -T, and -u options.
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jtc
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cbb8cacbb2
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c7c97b414c
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@ -1,4 +1,4 @@
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.\" $NetBSD: who.1,v 1.4 1994/11/14 05:13:16 jtc Exp $
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.\" $NetBSD: who.1,v 1.5 1994/12/07 04:28:47 jtc Exp $
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.\"
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.\" Copyright (c) 1986, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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@ -33,7 +33,7 @@
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.\"
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.\" @(#)who.1 8.2 (Berkeley) 12/30/93
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.\"
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.Dd December 30, 1993
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.Dd December 6, 1994
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.Dt WHO 1
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.Os
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.Sh NAME
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@ -41,19 +41,38 @@
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.Nd display who is logged in
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.Sh SYNOPSIS
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.Nm who
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.Op Ar am I
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.Op Fl mTu
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.Op Ar file
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.Sh DESCRIPTION
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The utility
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.Nm who
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displays
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a list of all users currently logged on, showing for each user
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the login name,
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tty name, the date and time of login, and hostname if not local.
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.Ar am i
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.Sh DESCRIPTION
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The
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.Nm who
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utility displays a list of all users currently logged on, showing for
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each user the login name, tty name, the date and time of login, and
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hostname if not local.
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.Pp
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Available options:
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.Pp
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.Bl -tag -width file
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.It Fl m
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Only print information about the current terminal. This is the
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.Tn POSIX
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way of saying
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.Nm who
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.Ar am i .
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.It Fl T
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Print a character after the user name indicating the state of the
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terminal line:
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.Sq +
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if the terminal is writable;
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.Sq -
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if it is not;
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and
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.Sq ?
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if a bad line is encountered.
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.It Fl u
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Print the idle time for each user.
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.It Ar \&am I
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Returns the invoker's real user name.
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.It Ar file
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@ -97,11 +116,17 @@ special characters, see
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.El
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.Sh SEE ALSO
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.Xr last 1 ,
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.Xr mesg 1 ,
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.Xr users 1 ,
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.Xr getuid 2 ,
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.Xr utmp 5
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.Sh HISTORY
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A
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.Nm
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command appeared in
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utility appeared in
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.At v6 .
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.Sh STANDARDS
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The
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.Nm
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utility is expected to conform to
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.St -p1003.2-92 .
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@ -1,4 +1,4 @@
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/* $NetBSD: who.c,v 1.3 1994/11/14 05:13:17 jtc Exp $ */
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/* $NetBSD: who.c,v 1.4 1994/12/07 04:28:49 jtc Exp $ */
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/*
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* Copyright (c) 1989, 1993
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@ -46,79 +46,173 @@ static char copyright[] =
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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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static char rcsid[] = "$NetBSD: who.c,v 1.3 1994/11/14 05:13:17 jtc Exp $";
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static char rcsid[] = "$NetBSD: who.c,v 1.4 1994/12/07 04:28:49 jtc Exp $";
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#endif /* not lint */
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#include <sys/types.h>
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#include <sys/file.h>
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#include <sys/time.h>
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#include <sys/stat.h>
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#include <pwd.h>
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#include <utmp.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <time.h>
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#include <err.h>
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void output __P((struct utmp *));
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void who_am_i __P((FILE *));
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void usage __P((void));
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int only_current_term; /* show info about the current terminal only */
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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
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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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register char *p;
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struct utmp usr;
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struct passwd *pw;
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FILE *ufp, *file();
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char *t, *rindex(), *strcpy(), *strncpy(), *ttyname();
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time_t time();
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int c;
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while ((c = getopt(argc, argv, "mTu")) != -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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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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switch (argc) {
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case 1: /* who */
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ufp = file(_PATH_UTMP);
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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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break;
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case 2: /* who utmp_file */
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ufp = file(argv[1]);
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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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break;
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case 3: /* who am i */
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case 0: /* who */
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ufp = file(_PATH_UTMP);
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/* search through the utmp and find an entry for this tty */
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if (p = ttyname(0)) {
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/* strip any directory component */
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if (t = rindex(p, '/'))
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p = t + 1;
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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 && !strcmp(usr.ut_line, p)) {
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if (*usr.ut_name && *usr.ut_line)
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output(&usr);
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exit(0);
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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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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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(void)fprintf(stderr, "usage: who [ file ]\n who am i\n");
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exit(1);
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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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register 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)) {
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/* strip any directory component */
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if (t = rindex(p, '/'))
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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 && !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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char *ctime();
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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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(void)printf("%-*.*s %-*.*s", UT_NAMESIZE, UT_NAMESIZE, up->ut_name,
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UT_LINESIZE, UT_LINESIZE, up->ut_line);
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(void)printf("%.12s", ctime(&up->ut_time) + 4);
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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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} else {
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state = '?';
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idle = 0;
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}
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}
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(void)printf("%-*.*s ", UT_NAMESIZE, 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 ", UT_LINESIZE, 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("%02d:%02d ",
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(idle / (60 * 60)),
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(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)", UT_HOSTSIZE, up->ut_host);
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(void)putchar('\n');
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@ -128,13 +222,18 @@ FILE *
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file(name)
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char *name;
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{
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extern int errno;
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FILE *ufp;
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char *strerror();
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if (!(ufp = fopen(name, "r"))) {
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(void)fprintf(stderr, "who: %s: %s.\n", name, strerror(errno));
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exit(1);
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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 [-mTu] [ file ]\n who am i\n");
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exit(1);
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}
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