Reimplement the who(1) utility to add some features required by SUSv3:
-H option (show column headings), -T (show mesg(1) state), -m (same as "am I"), -u (show idle time), -q (quick mode; list names in columns). PR: 36128 Reviewed by: mike
This commit is contained in:
Tim J. Robbins
parent
eed3fdf51c
commit
38a9994201
@ -32,31 +32,60 @@
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.\" @(#)who.1 8.2 (Berkeley) 12/30/93
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.\" $FreeBSD$
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.\"
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.Dd December 30, 1993
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.Dd May 8, 2002
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.Dt WHO 1
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.Os
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.Sh NAME
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.Nm who
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.Nd display who is logged in
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.Nd display who is on the system
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.Sh SYNOPSIS
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.Nm
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.Ar am I
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.Nm
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.Op Fl HmqsTu
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.Op Cm am I
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.Op Ar file
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.Sh DESCRIPTION
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The
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.Nm
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utility 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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utility displays information about currently logged in users.
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By default, this includes the login name, tty name, date and time of login and
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remote hostname if not local.
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.Pp
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Available options:
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The options are as follows:
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.Bl -tag -width indent
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.It Fl H
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Write column headings above the output.
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.It Fl m
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Show information about the terminal attached to standard input only.
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.It Fl q
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.Dq Quick mode Ns :
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List the names and number of logged in users in columns.
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All other command line options are ignored.
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.It Fl s
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Show the name, line and time fields only.
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This is the default.
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.It Fl T
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Indicate whether each user is accepting messages.
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One of the following characters is written:
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.Bl -tag -width x -compact
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.It +
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User is accepting messages.
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.It \&-
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User is not accepting messages.
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.It ?
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An error occurred.
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.El
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.It Fl u
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Show idle time for each user in hours and minutes as
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.Ql hh:mm ,
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.Ql \&.
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if the user has been idle less that a minute and
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.Ql old
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if the user has been idle more than 24 hours.
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.It Cm am I
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Equivalent to
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.Fl m .
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.El
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.Pp
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.Bl -tag -width file
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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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By default,
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.Nm
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gathers information from the file
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@ -80,7 +109,6 @@ since
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.Pa wtmp
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was last truncated or
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created.
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.El
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.Pp
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If
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.Pa /var/log/wtmp
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@ -95,11 +123,18 @@ special characters, see
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.It Pa /var/log/wtmp
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.It Pa /var/log/wtmp.[0-6]
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.El
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.Sh DIAGNOSTICS
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.Ex -std
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.Sh SEE ALSO
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.Xr last 1 ,
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.Xr users 1 ,
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.Xr getuid 2 ,
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.Xr w 1 ,
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.Xr utmp 5
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.Sh STANDARDS
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The
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.Nm
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utility conforms to
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.St -p1003.1-2001 .
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.Sh HISTORY
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A
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.Nm
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@ -1,9 +1,6 @@
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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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* Copyright (c) 2002 Tim J. Robbins.
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* All rights reserved.
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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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@ -13,18 +10,11 @@
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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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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR 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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@ -35,25 +25,16 @@
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#ifndef lint
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static const char 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
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#ifndef lint
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static const char sccsid[] = "@(#)who.c 8.1 (Berkeley) 6/6/93";
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#endif
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#include <sys/types.h>
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#include <sys/file.h>
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#include <sys/ioctl.h>
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#include <sys/stat.h>
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#include <err.h>
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#include <langinfo.h>
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#include <locale.h>
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#include <paths.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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@ -62,107 +43,239 @@ static const char sccsid[] = "@(#)who.c 8.1 (Berkeley) 6/6/93";
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#include <unistd.h>
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#include <utmp.h>
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static void usage(void);
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static void output(struct utmp *);
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static FILE *file(const char *);
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static void heading(void);
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static void process_utmp(FILE *);
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static void quick(FILE *);
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static void row(struct utmp *);
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static int ttywidth(void);
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static void usage(void);
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static void whoami(FILE *);
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static int Hflag; /* Write column headings */
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static int mflag; /* Show info about current terminal */
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static int qflag; /* "Quick" mode */
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static int sflag; /* Show name, line, time */
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static int Tflag; /* Show terminal state */
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static int uflag; /* 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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main(int argc, char *argv[])
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{
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char *p;
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struct utmp usr;
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struct passwd *pw;
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FILE *ufp;
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char *t;
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int ch;
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const char *file;
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FILE *fp;
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(void) setlocale(LC_TIME, "");
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setlocale(LC_TIME, "");
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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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if (strcmp(argv[1], "am")
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|| (strcmp(argv[2], "I") && strcmp(argv[2], "i")))
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usage();
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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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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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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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break;
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default:
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usage();
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while ((ch = getopt(argc, argv, "HTabdlmpqrstu")) != -1) {
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switch (ch) {
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case 'H': /* Write column headings */
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Hflag = 1;
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break;
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case 'T': /* Show terminal state */
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Tflag = 1;
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break;
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case 'm': /* Show info about current terminal */
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mflag = 1;
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break;
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case 'q': /* "Quick" mode */
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qflag = 1;
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break;
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case 's': /* Show name, line, time */
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sflag = 1;
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break;
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case 'u': /* Show idle time */
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uflag = 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 (argc >= 2 && strcmp(argv[0], "am") == 0 &&
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(strcmp(argv[1], "i") == 0 || strcmp(argv[1], "I") == 0)) {
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/* "who am i" or "who am I", equivalent to -m */
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mflag = 1;
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argc -= 2;
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argv += 2;
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}
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if (argc > 1)
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usage();
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if (*argv != NULL)
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file = *argv;
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else
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file = _PATH_UTMP;
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if ((fp = fopen(file, "r")) == NULL)
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err(1, "%s", file);
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if (qflag)
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quick(fp);
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else {
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if (sflag)
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Tflag = uflag = 0;
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if (Hflag)
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heading();
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if (mflag)
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whoami(fp);
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else
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process_utmp(fp);
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}
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fclose(fp);
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exit(0);
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}
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static void
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usage()
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void
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usage(void)
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{
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(void)fprintf(stderr, "%s\n%s\n",
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"usage: who [file]",
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" who am i");
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fprintf(stderr, "usage: who [-HmqsTu] [am I] [file]\n");
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exit(1);
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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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heading(void)
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{
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char buf[80];
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printf("%-*s ", UT_NAMESIZE, "NAME");
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if (Tflag)
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printf("S ");
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printf("%-*s ", UT_LINESIZE, "LINE");
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printf("%-*s ", 12, "TIME");
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if (uflag)
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printf("IDLE ");
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putchar('\n');
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}
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void
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row(struct utmp *ut)
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{
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char buf[80], tty[sizeof(_PATH_DEV) + UT_LINESIZE];
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struct stat sb;
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time_t idle;
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static int d_first = -1;
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struct tm *tm;
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char state;
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if (d_first < 0)
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d_first = (*nl_langinfo(D_MD_ORDER) == 'd');
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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)strftime(buf, sizeof(buf),
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d_first ? "%e %b %R" : "%b %e %R",
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localtime(&up->ut_time));
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(void)printf("%s", buf);
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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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if (Tflag || uflag) {
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snprintf(tty, sizeof(tty), "%s%.*s", _PATH_DEV,
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UT_LINESIZE, ut->ut_line);
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state = '?';
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idle = 0;
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if (stat(tty, &sb) == 0) {
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state = sb.st_mode & (S_IWOTH|S_IWGRP) ?
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'+' : '-';
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idle = time(NULL) - sb.st_mtime;
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}
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}
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printf("%-*.*s ", UT_NAMESIZE, UT_NAMESIZE, ut->ut_name);
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if (Tflag)
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printf("%c ", state);
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printf("%-*.*s ", UT_LINESIZE, UT_LINESIZE, ut->ut_line);
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tm = localtime(&ut->ut_time);
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strftime(buf, sizeof(buf), d_first ? "%e %b %R" : "%b %e %R", tm);
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printf("%-*s ", 12, buf);
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if (uflag) {
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if (idle < 60)
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printf(" . ");
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else if (idle < 24 * 60 * 60)
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printf("%02d:%02d ", (int)(idle / 60 / 60),
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(int)(idle / 60 % 60));
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else
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printf(" old ");
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}
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if (*ut->ut_host != '\0')
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printf("(%.*s)", UT_HOSTSIZE, ut->ut_host);
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putchar('\n');
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}
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static FILE *
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file(name)
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const char *name;
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void
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process_utmp(FILE *fp)
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{
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FILE *ufp;
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struct utmp ut;
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if (!(ufp = fopen(name, "r")))
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err(1, "%s", name);
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return(ufp);
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while (fread(&ut, sizeof(ut), 1, fp) == 1)
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if (*ut.ut_name != '\0')
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row(&ut);
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}
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void
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quick(FILE *fp)
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{
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struct utmp ut;
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int col, ncols, num;
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ncols = ttywidth();
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col = num = 0;
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while (fread(&ut, sizeof(ut), 1, fp) == 1) {
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if (*ut.ut_name == '\0')
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continue;
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printf("%-*.*s", UT_NAMESIZE, UT_NAMESIZE, ut.ut_name);
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if (++col < ncols / (UT_NAMESIZE + 1))
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putchar(' ');
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else {
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col = 0;
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putchar('\n');
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}
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num++;
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}
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if (col != 0)
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putchar('\n');
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printf("# users = %d\n", num);
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}
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void
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whoami(FILE *fp)
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{
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struct utmp ut;
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struct passwd *pwd;
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const char *name, *p, *tty;
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if ((tty = ttyname(STDIN_FILENO)) == NULL)
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tty = "tty??";
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else if ((p = strrchr(tty, '/')) != NULL)
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tty = p + 1;
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/* Search utmp for our tty, dump first matching record. */
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while (fread(&ut, sizeof(ut), 1, fp) == 1)
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if (*ut.ut_name != '\0' && strncmp(ut.ut_line, tty,
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UT_LINESIZE) == 0) {
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row(&ut);
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return;
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}
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/* Not found; fill the utmp structure with the information we have. */
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memset(&ut, 0, sizeof(ut));
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if ((pwd = getpwuid(getuid())) != NULL)
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name = pwd->pw_name;
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else
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name = "?";
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strncpy(ut.ut_name, name, UT_NAMESIZE);
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strncpy(ut.ut_line, tty, UT_LINESIZE);
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time(&ut.ut_time);
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row(&ut);
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}
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int
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ttywidth(void)
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{
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struct winsize ws;
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int width;
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if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) != -1)
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width = ws.ws_col;
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else
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width = 80;
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return (width);
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}
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