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author | Cameron Katri <me@cameronkatri.com> | 2021-05-09 14:20:58 -0400 |
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committer | Cameron Katri <me@cameronkatri.com> | 2021-05-09 14:20:58 -0400 |
commit | 5fd83771641d15c418f747bd343ba6738d3875f7 (patch) | |
tree | 5abf0f78f680d9837dbd93d4d4c3933bb7509599 /basic_cmds/mesg/mesg.c | |
download | apple_cmds-5fd83771641d15c418f747bd343ba6738d3875f7.tar.gz apple_cmds-5fd83771641d15c418f747bd343ba6738d3875f7.tar.zst apple_cmds-5fd83771641d15c418f747bd343ba6738d3875f7.zip |
Import macOS userland
adv_cmds-176
basic_cmds-55
bootstrap_cmds-116.100.1
developer_cmds-66
diskdev_cmds-667.40.1
doc_cmds-53.60.1
file_cmds-321.40.3
mail_cmds-35
misc_cmds-34
network_cmds-606.40.1
patch_cmds-17
remote_cmds-63
shell_cmds-216.60.1
system_cmds-880.60.2
text_cmds-106
Diffstat (limited to 'basic_cmds/mesg/mesg.c')
-rw-r--r-- | basic_cmds/mesg/mesg.c | 116 |
1 files changed, 116 insertions, 0 deletions
diff --git a/basic_cmds/mesg/mesg.c b/basic_cmds/mesg/mesg.c new file mode 100644 index 0000000..b66980b --- /dev/null +++ b/basic_cmds/mesg/mesg.c @@ -0,0 +1,116 @@ +/* + * 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. 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. + */ + +#ifndef lint +static const char copyright[] = +"@(#) Copyright (c) 1987, 1993\n\ + The Regents of the University of California. All rights reserved.\n"; +#endif /* not lint */ + +#ifndef lint +#if 0 +static char sccsid[] = "@(#)mesg.c 8.2 (Berkeley) 1/21/94"; +#endif +#endif /* not lint */ +#include <sys/cdefs.h> +__RCSID("$FreeBSD: src/usr.bin/mesg/mesg.c,v 1.8 2002/09/04 23:29:04 dwmalone Exp $"); + +#include <sys/types.h> +#include <sys/stat.h> + +#include <err.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> + +static void usage(void); + +int +main(int argc, char *argv[]) +{ + struct stat sb; + char *tty; + int ch; + + while ((ch = getopt(argc, argv, "")) != -1) + switch (ch) { + case '?': + default: + 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) < 0) + err(2, "%s", tty); + + if (*argv == NULL) { + if (sb.st_mode & S_IWGRP) { + (void)puts("is y"); + exit(0); + } + (void)puts("is n"); + exit(1); + } + + switch (*argv[0]) { + case 'y': + if (chmod(tty, sb.st_mode | S_IWGRP) < 0) + err(2, "%s", tty); + exit(0); + case 'n': + if (chmod(tty, sb.st_mode & ~S_IWGRP) < 0) + err(2, "%s", tty); + exit(1); + } + + usage(); + return(0); +} + +static void +usage(void) +{ + (void)fprintf(stderr, "usage: mesg [y | n]\n"); + exit(2); +} |