Add a new utility that runs an executable detached from the

controlling terminal.

Discussed on:	-hackers
Obtained from:	BSD/OS

3 files changed, 158 insertions, 0 deletions

diff --git a/usr.sbin/daemon/Makefile b/usr.sbin/daemon/Makefile
new file mode 100644
index 0000000..ab9f706
--- /dev/null
+++ b/usr.sbin/daemon/Makefile
@@ -0,0 +1,7 @@
+# $FreeBSD$
+
+PROG=	daemon
+WARNS?=	2
+MAN=	daemon.8
+
+.include <bsd.prog.mk>
diff --git a/usr.sbin/daemon/daemon.8 b/usr.sbin/daemon/daemon.8
new file mode 100644
index 0000000..3a23f54
--- /dev/null
+++ b/usr.sbin/daemon/daemon.8
@@ -0,0 +1,73 @@
+.\" Copyright (c) 1999 Berkeley Software Design, Inc. 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. Berkeley Software Design Inc's name may not be used to endorse or
+.\"    promote products derived from this software without specific prior
+.\"    written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY BERKELEY SOFTWARE DESIGN INC ``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 BERKELEY SOFTWARE DESIGN INC 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.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd August 30, 2001
+.Dt DAEMON 8
+.Os BSD 3
+.Sh NAME
+.Nm daemon
+.Nd run detached from the controlling terminal
+.Sh SYNOPSIS
+.Nm daemon
+.Op Fl cf
+.Ar "command arguments ..."
+.Sh DESCRIPTION
+.Pp
+The
+.Nm
+utility detaches itself from the controlling terminal and 
+executes the program specified by its arguments.
+.Pp
+The options are as follows:
+.Bl -tag -width Ds
+.It Fl c
+Change the current working directory to the root (``/'').
+.It Fl f
+Redirect standard input, standard output and standard error to
+.Pa /dev/null .
+.El
+.Sh DIAGNOSTICS 
+The
+.Nm
+utility exits 1 if an error is returned by the
+.Xr daemon 3
+library routine, otherwise 0.
+If the command cannot be executed, an error message is displayed on
+standard error unless the
+.Fl f
+flag is specified.
+.Sh SEE ALSO
+.Xr daemon 3 ,
+.Xr exec 3 ,
+.Xr termios 4 ,
+.Xr tty 4
+.Sh HISTORY
+The
+.Nm
+utility first appeared in
+.Fx 5.0 .
diff --git a/usr.sbin/daemon/daemon.c b/usr.sbin/daemon/daemon.c
new file mode 100644
index 0000000..89f135b
--- /dev/null
+++ b/usr.sbin/daemon/daemon.c
@@ -0,0 +1,78 @@
+/*-
+ * Copyright (c) 1999 Berkeley Software Design, Inc. 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. Berkeley Software Design Inc's name may not be used to endorse or
+ *    promote products derived from this software without specific prior
+ *    written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY BERKELEY SOFTWARE DESIGN INC ``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 BERKELEY SOFTWARE DESIGN INC 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.
+ *
+ *	From BSDI: daemon.c,v 1.2 1996/08/15 01:11:09 jch Exp
+ * $FreeBSD$
+ */
+
+#include <sys/types.h>
+
+#include <err.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+static void usage(void);
+
+int
+main(int argc, char *argv[])
+{
+	int ch, nochdir, noclose;
+
+	nochdir = noclose = 1;
+	while ((ch = getopt(argc, argv, "-cf")) != -1) {
+		switch (ch) {
+		case 'c':
+			nochdir = 0;
+			break;
+		case 'f':
+			noclose = 0;
+			break;
+		case '?':
+		default:
+			usage();
+		}
+	}
+	argc -= optind;
+	argv += optind;
+
+	if (argc == 0)
+		usage();
+	if (daemon(nochdir, noclose) == -1)
+		err(1, NULL);
+	execvp(argv[0], argv);
+
+	/* The child is now running, so the exit status doesn't matter. */
+	err(1, "%s", argv[0]);
+}
+
+static void
+usage(void)
+{
+	(void)fprintf(stderr, "usage: daemon [-cf] command arguments ...\n");
+	exit(1);
+}