diff options
Diffstat (limited to 'init/mesg.c')
-rw-r--r-- | init/mesg.c | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/init/mesg.c b/init/mesg.c new file mode 100644 index 0000000..cfb517f --- /dev/null +++ b/init/mesg.c @@ -0,0 +1,46 @@ +/* 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 "libbb.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) MAIN_EXTERNALLY_VISIBLE; +int mesg_main(int argc, char **argv) +{ + struct stat sb; + const char *tty; + char c = 0; + + if (--argc == 0 + || (argc == 1 && ((c = **++argv) == 'y' || c == 'n')) + ) { + tty = ttyname(STDERR_FILENO); + if (tty == NULL) { + tty = "ttyname"; + } else if (stat(tty, &sb) == 0) { + mode_t m; + if (argc == 0) { + puts((sb.st_mode & (S_IWGRP|S_IWOTH)) ? "is y" : "is n"); + 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) { + return EXIT_SUCCESS; + } + } + bb_simple_perror_msg_and_die(tty); + } + bb_show_usage(); +} |