| File: | src/usr.bin/mesg/mesg.c |
| Warning: | line 61, column 2 Value stored to 'argc' is never read |
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| 1 | /* $OpenBSD: mesg.c,v 1.17 2021/07/12 15:09:20 beck Exp $ */ |
| 2 | /* $NetBSD: mesg.c,v 1.4 1994/12/23 07:16:32 jtc Exp $ */ |
| 3 | |
| 4 | /* |
| 5 | * Copyright (c) 1987, 1993 |
| 6 | * The Regents of the University of California. All rights reserved. |
| 7 | * (c) UNIX System Laboratories, Inc. |
| 8 | * All or some portions of this file are derived from material licensed |
| 9 | * to the University of California by American Telephone and Telegraph |
| 10 | * Co. or Unix System Laboratories, Inc. and are reproduced herein with |
| 11 | * the permission of UNIX System Laboratories, Inc. |
| 12 | * |
| 13 | * Redistribution and use in source and binary forms, with or without |
| 14 | * modification, are permitted provided that the following conditions |
| 15 | * are met: |
| 16 | * 1. Redistributions of source code must retain the above copyright |
| 17 | * notice, this list of conditions and the following disclaimer. |
| 18 | * 2. Redistributions in binary form must reproduce the above copyright |
| 19 | * notice, this list of conditions and the following disclaimer in the |
| 20 | * documentation and/or other materials provided with the distribution. |
| 21 | * 3. Neither the name of the University nor the names of its contributors |
| 22 | * may be used to endorse or promote products derived from this software |
| 23 | * without specific prior written permission. |
| 24 | * |
| 25 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 26 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 27 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 28 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 29 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 30 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 31 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 32 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 33 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 34 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 35 | * SUCH DAMAGE. |
| 36 | */ |
| 37 | |
| 38 | #include <sys/types.h> |
| 39 | #include <sys/stat.h> |
| 40 | |
| 41 | #include <err.h> |
| 42 | #include <errno(*__errno()).h> |
| 43 | #include <stdio.h> |
| 44 | #include <stdlib.h> |
| 45 | #include <string.h> |
| 46 | #include <unistd.h> |
| 47 | |
| 48 | int |
| 49 | main(int argc, char *argv[]) |
| 50 | { |
| 51 | struct stat sb; |
| 52 | char *tty; |
| 53 | int ch; |
| 54 | |
| 55 | while ((ch = getopt(argc, argv, "")) != -1) |
| 56 | switch (ch) { |
| 57 | case '?': |
| 58 | default: |
| 59 | goto usage; |
| 60 | } |
| 61 | argc -= optind; |
Value stored to 'argc' is never read | |
| 62 | argv += optind; |
| 63 | |
| 64 | if ((tty = ttyname(STDERR_FILENO2)) == NULL((void *)0)) |
| 65 | err(2, "ttyname"); |
| 66 | |
| 67 | if (unveil(tty, "rw") == -1) |
| 68 | err(2, "unveil %s", tty); |
| 69 | if (pledge("stdio rpath fattr", NULL((void *)0)) == -1) |
| 70 | err(2, "pledge"); |
| 71 | |
| 72 | if (stat(tty, &sb) == -1) |
| 73 | err(2, "%s", tty); |
| 74 | |
| 75 | sb.st_mode &= ACCESSPERMS(0000700|0000070|0000007); |
| 76 | |
| 77 | if (*argv == NULL((void *)0)) { |
| 78 | if (sb.st_mode & S_IWGRP0000020) { |
| 79 | (void)fprintf(stderr(&__sF[2]), "is y\n"); |
| 80 | exit(0); |
| 81 | } |
| 82 | (void)fprintf(stderr(&__sF[2]), "is n\n"); |
| 83 | exit(1); |
| 84 | } |
| 85 | |
| 86 | switch (*argv[0]) { |
| 87 | case 'y': |
| 88 | if (chmod(tty, sb.st_mode | S_IWGRP0000020) == -1) |
| 89 | err(2, "%s", tty); |
| 90 | exit(0); |
| 91 | case 'n': |
| 92 | if (chmod(tty, sb.st_mode & ~S_IWGRP0000020) == -1) |
| 93 | err(2, "%s", tty); |
| 94 | exit(1); |
| 95 | } |
| 96 | |
| 97 | usage: (void)fprintf(stderr(&__sF[2]), "usage: mesg [n | y]\n"); |
| 98 | exit(2); |
| 99 | } |