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Diffstat (limited to 'doc/s6-svwait.html')
| -rw-r--r-- | doc/s6-svwait.html | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/doc/s6-svwait.html b/doc/s6-svwait.html index 6e15704..5f3cb08 100644 --- a/doc/s6-svwait.html +++ b/doc/s6-svwait.html @@ -33,7 +33,7 @@ s6-svwait only waits for notifications; it never polls. <p> s6-svwait monitors one or more <a href="servicedir.html">service -directories</a> given as its arguments, waiting for a state (up or down) to +directories</a> given as its arguments, waiting for a state (ready, up or down) to happen. It exits 0 when the wanted condition becomes true. </p> @@ -46,8 +46,10 @@ This is the default; it is not reliable, but it does not depend on specific support in the service programs. See <a href="notifywhenup.html">this page</a> for details. </li> <li> <tt>-U</tt> : really up. s6-svwait will wait until the services are -up, as reported by the services themselves. This requires specific support in the -service programs: see the explanation on <a href="notifywhenup.html">this page</a>. </li> +up <em>and</em> ready as reported by the services themselves. This requires +specific support in the service programs, and the use of +<a href="s6-notifywhenup.html">s6-notifywhenup</a> in the service's run script. +See the explanation on <a href="notifywhenup.html">this page</a>. </li> <li> <tt>-d</tt> : down. s6-svwait will wait until the services are down. </li> <li> <tt>-o</tt> : or. s6-svwait will wait until <em>one</em> of the given services comes up or down. </li> @@ -59,13 +61,13 @@ to stderr and exit 1. By default, <em>timeout</em> is 0, which means no time limit. </li> </ul> - <h2> Internals </h2> <p> s6-svwait spawns a <a href="s6-ftrigrd.html">s6-ftrigrd</a> child to listen to notifications sent by <a href="s6-supervise.html">s6-supervise</a>. -It also checks <tt>supervise/status</tt> files to get the current service +It also checks <tt>supervise/status</tt> files, as well as the +<tt>supervise/ready</tt> files if necessary, to get the current service states, so it is immune to race conditions. </p> |