=== NAME ===

duende - run a child process as a daemon 

=== DESCRIPTION ===

duende makes a given child process a daemon. The standard output and 
standard error of the child process is logged via syslog() with a 
priority of LOG_INFO (LOG_ALERT on FreeBSD systems). 

=== USAGE ===

duende (--pid=/path/to/file) child_process [ all subsequent arguments 
passed on to child ] 

=== DETAILS ===

When duende is invoked, it spawns two processes. In addition to 
spawning the daemonized child process, duende also spawns a process 
which reads and logs the standard output of the daemonized process. The 
parent process stays alive so as to monitor the daemonized process. If 
the optional --pid argument is supplied, duende will write it's PID to 
the file specified by the argument. It is an error to supply the --pid 
argument without an equal sign and file name. 

duende requires a blank directory named /etc/maradns/logger to run. 

Should the parent duende process a HUP signal, duende will restart the 
child process. Should the daemonized or logging process received an 
untrapped HUP signal or exit with an exit code of 8, duende will 
restart the process. Should the daemonized or logging process exit for 
any other reason, duende will send the logger process a TERM signal and 
exit. Should the duende parent process receive a TERM or INT signal, 
duende sends all of its children TERM signals, then exits. 

The duende process must be started as the superuser; this is because 
Duende's intended child processes (maradns, DwMain, and DwTcp) need to 
bind to privileged ports, and because duende uses a setuid() call to 
change the user ID of the logging process to the user with ID 66. 

=== LOGGING ===

duende uses the syslog() facility to log the standard output of the 
program that it invokes. The name of the program (in other words, the 
"ident" given to openlog()) is the full path of the first argument 
given to duende. All messages created by the child process are sent to 
syslog() with a priority of LOG_INFO (LOG_ALERT on FreeBSD systems) and 
a "facility" of LOG_DAEMON; should duende itself encounter an error, it 
will send messages to syslog() with a priority of LOG_ALERT. 

For example, suppose one invokes duende thusly:

	duende /usr/local/sbin/DwMain

If invoked thusly, duende will log all messages with the "ident" 
(program name) of "/usr/local/sbin/DwMain". If this is not desired, 
invoke duende with something like:

	export PATH=$PATH:/usr/local/sbin 
	duende DwMain

This will log messages with a (more sensible) "ident" of DwMain. 

Note: If a non-POSIX Bourne shell (such as csh, es, rc, or fish) is 
used to invoke DwMain, the above syntax needs to be changed. 

Also, the directory /etc/maradns/logger, while used by duende, is not 
used to store any log messages. That is unless, for some reason, one 
configures syslog to store messages there. 

=== EXAMPLES ===

Using duende to start DwMain, where the configuration file is 
/etc/dwood3rc.2

	duende DwMain -f /etc/dwood3rc.2

Using duende to start zoneserver, where the mararc file is 
/etc/mararc.4

	duende zoneserver -f /etc/mararc.4

=== BUGS ===

Duende assumes that all of its children are well-behaved, eating their 
vegetables, going to bed when told, and terminating when receiving a 
TERM signal. 

=== LEGAL DISCLAIMER ===

THIS SOFTWARE IS PROVIDED BY THE AUTHORS ''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 AUTHORS 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. 

=== AUTHOR ===

Duende and this man page are written by Sam Trenholme. D Richard Felker 
III provided some invaluable assistance with the piping code which 
duende uses.  


