Add new tool tionxcl to bring ttys out of exclusive mode when

left by e.g. legacy uucp or tip.

tools/tools/tionxcl/Makefile

@@ -0,0 +1,6 @@
+# $FreeBSD$
+
+PROG=	tionxcl
+NO_MAN=	defined
+
+.include <bsd.prog.mk>

tools/tools/tionxcl/tionxcl.c

@@ -0,0 +1,101 @@
+/*-
+ * Copyright (c) 2008 Bruce Simpson.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#include <sys/param.h>
+#include <sys/types.h>
+#include <sys/ioctl.h>
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+#include <err.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+#include <libgen.h>
+#include <sysexits.h>
+
+#define DEVPATHNAME "/dev"
+
+int
+main(int argc, char *argv[])
+{
+	char *progname;
+	char *ttyname;
+	int fd;
+	int dofree;
+
+	dofree = 0;
+
+	progname = basename(argv[0]);
+	if (argc != 2)
+		errx(EX_USAGE, "usage: %s <ttyname>\n", progname);
+	if (geteuid() != 0)
+		errx(EX_NOPERM, "Sorry\n");
+
+	if (argv[1][0] == '/') {
+		ttyname = argv[1];
+	} else {
+		size_t len, maxpath, result;
+
+		len = strlen(argv[1]) + sizeof(DEVPATHNAME) + 1;
+
+		maxpath = pathconf(DEVPATHNAME, _PC_PATH_MAX);
+		if (len > maxpath) {
+			warnc(ENAMETOOLONG, ttyname);
+			exit(EX_DATAERR);
+		}
+
+		ttyname = malloc(len);
+		if (ttyname == NULL) {
+			warnc(ENOMEM, "malloc");
+			exit(EX_OSERR);
+		}
+		dofree = 1;
+
+		result = snprintf(ttyname, len, "%s/%s", DEVPATHNAME, argv[1]);
+		if (result >= len)
+			warnc(ENOMEM, "snprintf");
+	}
+
+	fd = open(ttyname, O_RDWR);
+	if (fd == -1) {
+		warnc(errno, "open %s", ttyname);
+		if (dofree)
+			free(ttyname);
+		exit(EX_OSERR);
+	}
+
+	if (0 != ioctl(fd, TIOCNXCL, 0))
+		warnc(errno, "ioctl TIOCNXCL %s", ttyname);
+
+	if (dofree)
+		free(ttyname);
+	exit(0);
+}