1 files changed, 47 insertions, 0 deletions
diff --git a/init/mesg.c b/init/mesg.c
new file mode 100644
index 000000000..7e47644c3
--- /dev/null
+++ b/init/mesg.c
@@ -0,0 +1,47 @@
+/* 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();
+}