DUENDE(8)                           duende                           DUENDE(8)



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.

USAGE
       duende 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.

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

       Should the parent duende process 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 and zoneserver) 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 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/maradns

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

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

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

       Note: If a non-POSIX Bourne shell (such as csh, es, rc, or fish) is
       used to invoke MaraDNS, 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 maradns, where the mararc file is /etc/mararc.2

            duende maradns -f /etc/mararc.3

       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.

SEE ALSO
       maradns(8), syslog(3)

       http://www.maradns.org

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.




January 2003                        duende                           DUENDE(8)
