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/* vi: set sw=4 ts=4: */
/*
* mesg implementation for busybox
*
* Copyright (c) 2002 Manuel Novoa III <mjn3@codepoet.org>
*
* Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
*/
#include "busybox.h"
#include <unistd.h>
#include <stdlib.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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