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Add a new utility that runs an executable detached from the

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controlling terminal.

Discussed on:	-hackers
Obtained from:	BSD/OS
This commit is contained in:
mike 2001-08-30 04:48:02 +00:00
parent 487729ee23
commit 6fa2f09167
4 changed files with 159 additions and 0 deletions
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1
usr.sbin/Makefile
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@ -21,6 +21,7 @@ SUBDIR= IPXrouted \
cron \
crunch \
ctm \
daemon \
dev_mkdb \
devinfo \
digictl \

7
usr.sbin/daemon/Makefile Normal file
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@ -0,0 +1,7 @@
# $FreeBSD$
PROG= daemon
WARNS?= 2
MAN= daemon.8
.include <bsd.prog.mk>

73
usr.sbin/daemon/daemon.8 Normal file
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@ -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 .

78
usr.sbin/daemon/daemon.c Normal file
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@ -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);
}