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svscan(8)                              System Manager's Manual                             svscan(8)



NAME
       svscan - starts and monitors a collection of services

SYNOPSIS
       svscan [ directory ]

DESCRIPTION
       svscan  starts one supervise(8) process for each subdirectory of the current directory, up to
       a limit of 1000 subdirectories.  svscan skips subdirectory names starting with dots.   super‐‐
       vise(8) must be in svscan's path.

       svscan  optionally starts a pair of supervise(8) processes, one for a subdirectory s, one for
       s/log, with a pipe between them. It does this if the name s is at most  255  bytes  long  and
       s/log  exists.  (In  versions 0.70 and below, it does this if s is sticky.)  svscan needs two
       free descriptors for each pipe.

       Every five seconds, svscan checks for subdirectories again. If it sees a new subdirectory, it
       starts  a  new  supervise(8)  process.  If  it  sees an old subdirectory where a supervise(8)
       process has exited, it restarts the supervise(8) process. In the log case it reuses the  same
       pipe so that no data is lost.

       svscan is designed to run forever. If it has trouble creating a pipe or running supervise(8),
       it prints a message to stderr; it will try again five seconds later.

       If svscan is given a command-line argument directory, it switches to that directory  when  it
       starts.

SEE ALSO
       supervise(8),  svc(8),  svok(8),  svstat(8), svscanboot(8), readproctitle(8), fghack(8), pgr‐
       phack(8), multilog(8),  tai64n(8),  tai64nlocal(8),  setuidgid(8),  envuidgid(8),  envdir(8),
       softlimit(8), setlock(8)

       http://cr.yp.to/daemontools.html



                                                                                           svscan(8)