OpenSolaris Launch

1 files changed, 167 insertions, 0 deletions

diff --git a/usr/src/cmd/mesg/mesg.c b/usr/src/cmd/mesg/mesg.c
new file mode 100644
index 0000000000..a82ad135f4
--- /dev/null
+++ b/usr/src/cmd/mesg/mesg.c
@@ -0,0 +1,167 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License, Version 1.0 only
+ * (the "License").  You may not use this file except in compliance
+ * with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+/*
+ * Copyright 2003 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#pragma ident	"%Z%%M%	%I%	%E% SMI"
+
+/*	Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T	*/
+/*	  All Rights Reserved  	*/
+
+
+/*
+ * mesg -- set current tty to accept or
+ *	forbid write permission.
+ *
+ *	mesg [-y | -n | y | n]
+ *		y allow messages
+ *		n forbid messages
+ *	return codes
+ *		0 if messages are ON or turned ON
+ *		1 if messages are OFF or turned OFF
+ *		2 if an error occurs
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <locale.h>
+#include <libintl.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+
+static void error(const char *s);
+static void newmode(mode_t m);
+static void usage(void);
+
+static char *tty;
+
+int
+main(int argc, char *argv[])
+{
+	int i, c, r = 0;
+	int action = 0;
+	struct stat sbuf;
+
+	extern int optind;
+
+	(void) setlocale(LC_ALL, "");
+#if !defined(TEXT_DOMAIN)		/* Should be defined by cc -D */
+#define	TEXT_DOMAIN	"SYS_TEST"	/* Use this only if it weren't */
+#endif
+	(void) textdomain(TEXT_DOMAIN);
+
+	/*
+	 * Check stdin, stdout and stderr, in order, for a tty
+	 */
+	for (i = 0; i <= 2; i++) {
+		if ((tty = ttyname(i)) != NULL)
+			break;
+	}
+
+	if (stat(tty, &sbuf) < 0)
+		error("cannot stat");
+
+	if (argc < 2) {
+		if (sbuf.st_mode & (S_IWGRP | S_IWOTH)) {
+			(void) printf("is y\n");
+		} else {
+			r = 1;
+			(void) printf("is n\n");
+		}
+		exit(r);
+	}
+
+	while ((c = getopt(argc, argv, "yn")) != EOF) {
+		switch (c) {
+		case 'y':
+			if (action > 0)
+				usage();
+
+			newmode(S_IRUSR | S_IWUSR | S_IWGRP);
+			action++;
+			break;
+
+		case 'n':
+			if (action > 0)
+				usage();
+
+			newmode(S_IRUSR | S_IWUSR);
+			r = 1;
+			action++;
+			break;
+
+		case '?':
+			usage();
+			break;
+		}
+	}
+
+	/*
+	 * Required for POSIX.2
+	 */
+	if (argc > optind) {
+		if (action > 0)
+			usage();
+
+		switch (*argv[optind]) {
+		case 'y':
+			newmode(S_IRUSR | S_IWUSR | S_IWGRP);
+			break;
+
+		case 'n':
+			newmode(S_IRUSR | S_IWUSR);
+			r = 1;
+			break;
+
+		default:
+			usage();
+			break;
+		}
+	}
+
+	return (r);
+}
+
+void
+error(const char *s)
+{
+	(void) fprintf(stderr, "mesg: ");
+	(void) fprintf(stderr, "%s\n", s);
+	exit(2);
+}
+
+void
+newmode(mode_t m)
+{
+	if (chmod(tty, m) < 0)
+		error("cannot change mode");
+}
+
+void
+usage(void)
+{
+	(void) fprintf(stderr, gettext("usage: mesg [-y | -n | y | n]\n"));
+	exit(2);
+}