1 files changed, 96 insertions, 0 deletions
diff --git a/src/lib/apputils/daemon.c b/src/lib/apputils/daemon.c
new file mode 100644
index 0000000000000..a3d7cd7373040
--- /dev/null
+++ b/src/lib/apputils/daemon.c
@@ -0,0 +1,96 @@
+/* -*- mode: c; c-file-style: "bsd"; indent-tabs-mode: t -*- */
+/*
+ * Copyright (c) 1990 The Regents of the University of California.
+ * 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.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
+ */
+
+#include "k5-int.h"
+#include <fcntl.h>
+#include <sys/types.h>
+#include <sys/file.h>
+#include <unistd.h>
+#ifdef HAVE_PATHS_H
+#include <paths.h>
+#endif
+
+#ifndef _PATH_DEVNULL
+#define _PATH_DEVNULL "/dev/null"
+#endif
+
+int
+daemon(nochdir, noclose)
+	int nochdir, noclose;
+{
+	int cpid;
+
+	if ((cpid = fork()) == -1)
+		return (-1);
+	if (cpid)
+		exit(0);
+#ifdef HAVE_SETSID
+	(void) setsid();
+#else
+#ifndef TIOCNOTTY
+	setpgrp();
+#else
+	{
+		int n;
+
+		/*
+		 * The open below may hang on pseudo ttys if the person
+		 * who starts named logs out before this point.  Thus,
+		 * the need for the timer.
+		 */
+		alarm(120);
+		n = open("/dev/tty", O_RDWR);
+		alarm(0);
+		if (n > 0) {
+			(void) ioctl(n, TIOCNOTTY, (char *)NULL);
+			(void) close(n);
+		}
+	}
+#endif
+#endif
+	if (!nochdir)
+		(void) chdir("/");
+	if (!noclose) {
+		int devnull = open(_PATH_DEVNULL, O_RDWR, 0);
+
+		if (devnull != -1) {
+			(void) dup2(devnull, 0);
+			(void) dup2(devnull, 1);
+			(void) dup2(devnull, 2);
+			if (devnull > 2)
+				(void) close(devnull);
+		}
+	}
+	return (0);
+}