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-.Dd August 13, 2020
-.Dt SPAWND 8
-.Os
-.
-.Sh NAME
-.Nm spawnd
-.Nd process supervisor
-.
-.Sh SYNOPSIS
-.Nm
-.Op Fl d
-.Op Fl C Ar path
-.Op Fl c Ar control
-.Op Fl f Ar spawntab
-.Op Fl g Ar group
-.Op Fl p Ar pidfile
-.Op Fl s Ar stopexits
-.Op Fl t Ar interval
-.Op Fl u Ar user
-.
-.Sh DESCRIPTION
-The
-.Nm
-daemon
-is a supervisor for processes
-with the following behavior:
-.Bl -enum
-.It
-The process runs in the foreground,
-not as a daemon.
-.It
-The process logs to standard output or standard error.
-.It
-The process handles errors by exiting
-and expects to be restarted.
-.It
-The process indicates its reason for exiting with
-.Xr sysexits 3 .
-.El
-.
-.Pp
-The
-.Nm
-daemon spawns processes for a list of
-.Em services ,
-redirects their output to syslog,
-and restarts the processes when they exit
-according to their exit status.
-Exponential backoff is applied to restarts.
-.
-.Pp
-The list of services is defined in a
-.Xr spawntab 5
-file.
-The services managed by
-.Nm
-can be controlled
-through a named pipe.
-The
-.Xr spawn 8
-utility is a wrapper
-around the named pipe,
-and its manual page
-describes the control command format.
-.
-.Pp
-The arguments are as follows:
-.Bl -tag -width Ds
-.It Fl C Ar path
-Change directory to
-.Ar path
-before starting services.
-By default the working directory is
-.Pa / .
-.
-.It Fl c Ar control
-Set the path of the named pipe
-used for control.
-.
-.It Fl d
-Do not run as a daemon.
-.
-.It Fl f Ar spawntab
-Set the path of the
-.Xr spawntab 5
-file.
-.
-.It Fl g Ar group
-Change group to
-.Ar group
-before starting services.
-If
-.Fl u
-is used,
-the default group is the user's group.
-.
-.It Fl p Ar pidfile
-Write the PID of the
-.Nm
-process to
-.Ar pidfile .
-.
-.It Fl s Ar stopexits
-Set the list of exit statuses
-for which a restart will not be attempted.
-The
-.Ar stopexits
-argument is a comma-separated list of integers.
-The default list contains the values of
-.Dv EX_USAGE ,
-.Dv EX_DATAERR ,
-.Dv EX_NOINPUT ,
-.Dv EX_OSFILE ,
-.Dv EX_CANTCREAT ,
-.Dv EX_CONFIG
-defined in
-.Xr sysexits 3 .
-The exit status 127
-is always treated as a stop exit.
-.
-.It Fl t Ar interval
-Set the initial interval between restarts
-in milliseconds.
-The default interval is 1000.
-.
-.It Fl u Ar user
-Change user to
-.Ar user
-before starting services.
-.El
-.
-.Pp
-When the
-.Nm
-daemon receives the
-.Dv HUP
-signal,
-the
-.Xr spawntab 5
-file is reloaded.
-Modified services
-are not automatically restarted,
-newly added services
-are not automatically started,
-and removed services
-are not automatically stopped.
-.
-.Pp
-When the
-.Nm
-daemon receives the
-.Dv TERM
-signal,
-the control named pipe is closed,
-all services are stopped,
-and
-.Nm
-exits.
-.
-.Sh ENVIRONMENT
-Services are started
-with empty environments
-apart from the following:
-.Bl -tag -width Ds
-.It Ev LOGNAME , Ev USER
-Set to the name of the user specified by
-.Fl u .
-.It Ev HOME
-Set to the home directory of the user specified by
-.Fl u .
-.It Ev SHELL
-Set to
-.Pa /bin/sh .
-.It Ev PATH
-Set to the system default defined by
-.Dv _PATH_DEFPATH
-in
-.In paths.h .
-.El
-.
-.Sh FILES
-.Bl -tag -width Ds
-.It Pa /usr/local/etc/spawntab
-The default path of the
-.Xr spawntab 5
-file.
-.It Pa /var/run/spawnd.pipe
-The default path of the named pipe
-used for control.
-.El
-.
-.Sh SEE ALSO
-.Xr spawntab 5 ,
-.Xr spawn 8
-.
-.Sh AUTHORS
-.An June Bug Aq Mt june@causal.agency