diff options
Diffstat (limited to 'usr.bin/mesg')
| -rw-r--r-- | usr.bin/mesg/mesg.1 | 89 | ||||
| -rw-r--r-- | usr.bin/mesg/mesg.c | 108 |
2 files changed, 197 insertions, 0 deletions
diff --git a/usr.bin/mesg/mesg.1 b/usr.bin/mesg/mesg.1 new file mode 100644 index 0000000..e5d9100 --- /dev/null +++ b/usr.bin/mesg/mesg.1 @@ -0,0 +1,89 @@ +.\" $NetBSD: mesg.1,v 1.10 2017/07/03 21:34:20 wiz Exp $ +.\" +.\" Copyright (c) 1987, 1990, 1993 +.\" The Regents of the University of California. All rights reserved. +.\" +.\" 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. 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. +.\" +.\" @(#)mesg.1 8.1 (Berkeley) 6/6/93 +.\" +.Dd June 6, 1993 +.Dt MESG 1 +.Os +.Sh NAME +.Nm mesg +.Nd display (do not display) messages from other users +.Sh SYNOPSIS +.Nm +.Op Cm n | Cm y +.Sh DESCRIPTION +The +.Nm +utility is invoked by a user to control write access others +have to the terminal device associated with the standard error +output. +Write access is allowed by default, and programs such as +.Xr talk 1 +and +.Xr write 1 +may display messages on the terminal. +.Pp +Options available: +.Bl -tag -width flag +.It Cm n +Disallows messages. +.It Cm y +Permits messages to be displayed. +.El +.Pp +If no arguments are given, +.Nm +displays the present message status to the standard error output. +.Pp +The +.Nm +utility exits with one of the following values: +.Pp +.Bl -tag -width flag -compact -offset indent +.It Li "\ 0" +Messages are allowed. +.It Li "\ 1" +Messages are not allowed. +.It Li ">1" +An error has occurred. +.El +.Sh FILES +.Bl -tag -width /dev/[pt]ty[pq]? -compact +.It Pa /dev/[pt]ty[pq]? +.El +.Sh SEE ALSO +.Xr biff 1 , +.Xr talk 1 , +.Xr write 1 +.Sh HISTORY +A +.Nm +command appeared in +.At v6 . diff --git a/usr.bin/mesg/mesg.c b/usr.bin/mesg/mesg.c new file mode 100644 index 0000000..cc54a75 --- /dev/null +++ b/usr.bin/mesg/mesg.c @@ -0,0 +1,108 @@ +/* $NetBSD: mesg.c,v 1.8 2008/07/21 14:19:24 lukem Exp $ */ + +/* + * Copyright (c) 1987, 1993 + * The Regents of the University of California. All rights reserved. + * (c) UNIX System Laboratories, Inc. + * All or some portions of this file are derived from material licensed + * to the University of California by American Telephone and Telegraph + * Co. or Unix System Laboratories, Inc. and are reproduced herein with + * the permission of UNIX System Laboratories, Inc. + * + * 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. 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> + +#ifndef lint +__COPYRIGHT("@(#) Copyright (c) 1987, 1993\ + The Regents of the University of California. All rights reserved."); +#endif /* not lint */ + +#ifndef lint +#if 0 +static char sccsid[] = "@(#)mesg.c 8.2 (Berkeley) 1/21/94"; +#endif +__RCSID("$NetBSD: mesg.c,v 1.8 2008/07/21 14:19:24 lukem Exp $"); +#endif /* not lint */ + +#include <sys/types.h> +#include <sys/stat.h> + +#include <err.h> +#include <errno.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> + +int +main(int argc, char *argv[]) +{ + struct stat sb; + char *tty; + int ch; + + setprogname(*argv); + + while ((ch = getopt(argc, argv, "")) != -1) + switch (ch) { + case '?': + default: + goto usage; + } + argc -= optind; + argv += optind; + + if ((tty = ttyname(STDIN_FILENO)) == NULL && + (tty = ttyname(STDOUT_FILENO)) == NULL && + (tty = ttyname(STDERR_FILENO)) == NULL) + err(2, "ttyname"); + if (stat(tty, &sb) == -1) + err(2, "%s", tty); + + if (*argv == NULL) { + if (sb.st_mode & S_IWGRP) { + (void)fprintf(stderr, "is y\n"); + return 0; + } + (void)fprintf(stderr, "is n\n"); + return 1; + } + + switch (*argv[0]) { + case 'y': + if (chmod(tty, sb.st_mode | S_IWGRP) == -1) + err(2, "%s", tty); + return 0; + case 'n': + if (chmod(tty, sb.st_mode & ~S_IWGRP) == -1) + err(2, "%s", tty); + return 1; + } + +usage: (void)fprintf(stderr, "Usage: %s [y | n]\n", getprogname()); + return 2; +} |