runsv(8)                                                              runsv(8)



NAME
       runsv - starts and monitors a service and optionally an appendant log
       service

SYNOPSIS
       runsv service

DESCRIPTION
       service must be a directory.

       runsv switches to the directory service and starts ./run.  If ./run
       exits and ./finish exists, runsv starts ./finish.  If ./finish doesn't
       exist or ./finish exits, runsv restarts ./run.

       If ./run or ./finish exit immediately, runsv waits a second before
       starting ./finish or restarting ./run.

       Two arguments are given to ./finish.  The first one is ./run's exit
       code, or -1 if ./run didn't exit normally.  The second one is the least
       significant byte of the exit status as determined by waitpid(2); for
       instance it is 0 if ./run exited normally, and the signal number if
       ./run was terminated by a signal.  If runsv cannot start ./run for some
       reason, the exit code is 111 and the status is 0.

       If the file service/down exists, runsv does not start ./run
       immediately.  The control interface (see below) can be used to start
       the service and to give other commands to runsv.

       If the directory service/log exists, runsv creates a pipe, redirects
       service/run's and service/finish's standard output to the pipe,
       switches to the directory service/log and starts ./run (and ./finish)
       exactly as described above for the service directory.  The standard
       input of the log service is redirected to read from the pipe.

       runsv maintains status information in a binary format (compatible to
       the daemontools' supervise program) in service/supervise/status and
       service/log/supervise/status, and in a human-readable format in
       service/supervise/stat, service/log/supervise/stat,
       service/supervise/pid, service/log/supervise/pid.

CONTROL
       The named pipes service/supervise/control, and (optionally)
       service/log/supervise/control are provided to give commands to runsv.
       You can use sv(8) to control the service or just write one of the
       following characters to the named pipe:

       u      Up.  If the service is not running, start it.  If the service
              stops, restart it.

       d      Down.  If the service is running, send it a TERM signal, and
              then a CONT signal.  If ./run exits, start ./finish if it
              exists.  After it stops, do not restart service.

       o      Once.  If the service is not running, start it.  Do not restart
              it if it stops.

       p      Pause.  If the service is running, send it a STOP signal.

       c      Continue.  If the service is running, send it a CONT signal.

       h      Hangup.  If the service is running, send it a HUP signal.

       a      Alarm.  If the service is running, send it a ALRM signal.

       i      Interrupt.  If the service is running, send it a INT signal.

       q      Quit.  If the service is running, send it a QUIT signal.

       1      User-defined 1.  If the service is running, send it a USR1
              signal.

       2      User-defined 2.  If the service is running, send it a USR2
              signal.

       t      Terminate.  If the service is running, send it a TERM signal.

       k      Kill.  If the service is running, send it a KILL signal.

       x      Exit.  If the service is running, send it a TERM signal, and
              then a CONT signal.  Do not restart the service.  If the service
              is down, and no log service exists, runsv exits.  If the service
              is down and a log service exists, runsv closes the standard
              input of the log service, and waits for it to terminate.  If the
              log service is down, runsv exits.  This command is ignored if it
              is given to service/log/supervise/control.

       Example: to send a TERM signal to the socklog-unix service, either do
         # sv term /var/service/socklog-unix
        or
         # printf t >/var/service/socklog-unix/supervise/control

       printf(1) usually blocks if no runsv process is running in the service
       directory.

CUSTOMIZE CONTROL
       For each control character c sent to the control pipe, runsv first
       checks if service/control/c exists and is executable.  If so, it starts
       service/control/c and waits for it to terminate, before interpreting
       the command.  If the program exits with return code 0, runsv refrains
       from sending the service the corresponding signal.  The command o is
       always considered as command u.  On command d first service/control/t
       is checked, and then service/control/d.  On command x first
       service/control/t is checked, and then service/control/x.  The control
       of the optional log service cannot be customized.

SIGNALS
       If runsv receives a TERM signal, it acts as if the character x was
       written to the control pipe.

EXIT CODES
       runsv exits 111 on an error on startup or if another runsv is running
       in service.

       runsv exits 0 if it was told to exit.

SEE ALSO
       sv(8), chpst(8), svlogd(8), runit(8), runit-init(8), runsvdir(8),
       runsvchdir(8), utmpset(8)

       http://smarden.org/runit/

AUTHOR
       Gerrit Pape <pape@smarden.org>



                                                                      runsv(8)
