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.
supervise(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),
pgrphack(8),
multilog(8),
tai64n(8),
tai64nlocal(8),
setuidgid(8),
envuidgid(8),
envdir(8),
softlimit(8),
setlock(8)
http://cr.yp.to/daemontools.html
