busybox/init/mesg.c

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/* vi: set sw=4 ts=4: */
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/*
* mesg implementation for busybox
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*
* Copyright (c) 2002 Manuel Novoa III <mjn3@codepoet.org>
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*
* Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
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*/
#include "busybox.h"
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#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);
int mesg_main(int argc, char **argv)
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{
struct stat sb;
const char *tty;
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char c = 0;
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if (--argc == 0
|| (argc == 1 && ((c = **++argv) == 'y' || c == 'n'))
) {
tty = ttyname(STDERR_FILENO);
if (tty == NULL) {
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tty = "ttyname";
} else if (stat(tty, &sb) == 0) {
mode_t m;
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if (argc == 0) {
puts((sb.st_mode & (S_IWGRP|S_IWOTH)) ? "is y" : "is n");
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return EXIT_SUCCESS;
}
m = (c == 'y') ? sb.st_mode | S_IWGRP_OR_S_IWOTH
: sb.st_mode & ~(S_IWGRP|S_IWOTH);
if (chmod(tty, m) == 0) {
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return EXIT_SUCCESS;
}
}
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bb_perror_msg_and_die("%s", tty);
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}
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bb_show_usage();
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}