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/*
* mesg implementation for busybox
*
* Copyright (c) 2002 Manuel Novoa III <mjn3@codepoet.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <unistd.h>
#include <stdlib.h>
#include "busybox.h"
#ifdef USE_TTY_GROUP
#define S_IWGRP_OR_S_IWOTH S_IWGRP
#else
#define S_IWGRP_OR_S_IWOTH (S_IWGRP | S_IWOTH)
#endif
int mesg_main(int argc, char *argv[])
{
struct stat sb;
char *tty;
char c = 0;
if ((--argc == 0)
|| ((argc == 1) && (((c = **++argv) == 'y') || (c == 'n')))) {
if ((tty = ttyname(STDERR_FILENO)) == NULL) {
tty = "ttyname";
} else if (stat(tty, &sb) == 0) {
if (argc == 0) {
puts(((sb.st_mode & (S_IWGRP | S_IWOTH)) ==
0) ? "is n" : "is y");
return EXIT_SUCCESS;
}
if (chmod
(tty,
(c ==
'y') ? sb.st_mode | (S_IWGRP_OR_S_IWOTH) : sb.
st_mode & ~(S_IWGRP | S_IWOTH)) == 0) {
return EXIT_SUCCESS;
}
}
bb_perror_msg_and_die("%s", tty);
}
bb_show_usage();
}
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