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| author | Laurent Bercot <ska-skaware@skarnet.org> | 2015-01-26 22:26:57 +0000 |
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| committer | Laurent Bercot <ska-skaware@skarnet.org> | 2015-01-26 22:26:57 +0000 |
| commit | 8bffa1c19fd05f4f04dad4b5b98f85b94f23113c (patch) | |
| tree | f4e25c3cdb7118db02a06c85b7862107a2074ba4 /doc/s6-fdholder-transferdumpc.html | |
| parent | 49cb17940e403431566dc7b5a312624f14eb25d0 (diff) | |
| download | s6-8bffa1c19fd05f4f04dad4b5b98f85b94f23113c.tar.xz | |
- added s6-fdholder-delete(c)
- small s6-fdholder-* fixes
- s6-fdholder documentation (in review)
- s6_svstatus_* bugfix (thanks Olivier Brunel)
Diffstat (limited to 'doc/s6-fdholder-transferdumpc.html')
| -rw-r--r-- | doc/s6-fdholder-transferdumpc.html | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/doc/s6-fdholder-transferdumpc.html b/doc/s6-fdholder-transferdumpc.html new file mode 100644 index 0000000..7bd6aa0 --- /dev/null +++ b/doc/s6-fdholder-transferdumpc.html @@ -0,0 +1,82 @@ +<html> + <head> + <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> + <meta http-equiv="Content-Language" content="en" /> + <title>s6: the s6-fdholder-transferdumpc program</title> + <meta name="Description" content="s6: the s6-fdholder-transferdumpc program" /> + <meta name="Keywords" content="s6 s6-fdholder fd-holding fd-holder fd dump transfer unix socket activation" /> + <!-- <link rel="stylesheet" type="text/css" href="http://skarnet.org/default.css" /> --> + </head> +<body> + +<p> +<a href="index.html">s6</a><br /> +<a href="http://skarnet.org/software/">Software</a><br /> +<a href="http://skarnet.org/">skarnet.org</a> +</p> + +<h1> The <tt>s6-fdholder-transferdumpc</tt> program </h1> + +<p> +<tt>s6-fdholder-transferdumpc</tt> talks to two +<a href="s6-fdholderd.html">fd-holding daemons</a>: the source of the +transfer on its +standard input, and the destination of the transfer on its standard output, +both being +open Unix domain sockets. It retrieves the entire storage state of +the source daemon and dumps it into the destination daemon. +</p> + +<h2> Interface </h2> + +<pre> + s6-fdholder-transferdumpc [ -t <em>timeoutfrom</em> ] [ -T timeoutto ] +</pre> + +<ul> + <li> s6-fdholder-transferdumpc expects to talk to a listening +<a href="s6-fdholderd.html">s6-fdholderd</a> program on its descriptor 0 and +to another one on its descriptor 1. </li> + <li> It gets the entire set of file descriptors from the first +server, with their identifiers and possibly expiration dates. </li> + <li> It stores that set into the second server. The set is +<em>added</em> to the second server, which keeps the descriptors +it was already holding. </li> + <li> It then exits 0, or 1 if a server returned an error. </li> +</ul> + +<h2> Options </h2> + +<ul> +<li> <tt>-t <em>timeoutfrom</em></tt> : if the set-retrieving +operation cannot be processed in <em>timeoutfrom</em> milliseconds, then +fail with an error message. +Communications with the server should be near-instant, so this option is +only here to protect users against programming errors. </li> +<li> <tt>-T <em>timeoutto</em></tt> : same thing with the +set-storing operation. </li> +</ul> + +<h2> Notes </h2> + +<ul> + <li> s6-fdholder-transferdumpc is the "internal" version of +<a href="s6-fdholder-transferdump.html">s6-fdholder-transferdump</a>. It simply +expects to be run with file descriptors already open to both +servers; <a href="s6-fdholder-transferdump.html">s6-fdholder-transferdump</a> +takes care of all the plumbing. </li> + <li> The error messages for the s6-fdholder suite are explained +<a href="s6-fdholder-errorcodes.html">here</a>. </li> + <li> Dumping the entire state of <a href="s6-fdholderd.html">s6-fdholderd</a> +requires special authorizations. Make sure the s6-fdholderd instances are +<a href="s6-fdholderd.html#configuration">configured</a> to accept +dump-getting and dump-setting requests from your client. </li> + <li> The point of the +<a href="s6-fdholder-transferdump.html">s6-fdholder-transferdump</a> and +s6-fdholder-transferdumpc programs is to move a set of fds from one +daemon to another, for instance in the event that the first one has to +to shut down for an upgrade. </li> +</ul> + +</body> +</html> |