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| author | Laurent Bercot <ska-skaware@skarnet.org> | 2018-08-14 20:22:43 +0000 |
|---|---|---|
| committer | Laurent Bercot <ska-skaware@skarnet.org> | 2018-08-14 20:22:43 +0000 |
| commit | f703916c3702d8f32dc535161571874cb007ca6d (patch) | |
| tree | 0298bb0de1d464c3868a6547a225534a4ccc40cc /doc/s6-devd.html | |
| parent | 3e34202f32ab10017d55aedb2665cf55fb5af5c0 (diff) | |
| download | s6-linux-utils-f703916c3702d8f32dc535161571874cb007ca6d.tar.xz | |
Remove s6-devd, s6-uevent-listener, s6-uevent-spawner, prepare for 2.5.0.0
Diffstat (limited to 'doc/s6-devd.html')
| -rw-r--r-- | doc/s6-devd.html | 80 |
1 files changed, 0 insertions, 80 deletions
diff --git a/doc/s6-devd.html b/doc/s6-devd.html deleted file mode 100644 index 1d7ae06..0000000 --- a/doc/s6-devd.html +++ /dev/null @@ -1,80 +0,0 @@ -<html> - <head> - <meta name="viewport" content="width=device-width, initial-scale=1.0" /> - <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> - <meta http-equiv="Content-Language" content="en" /> - <title>s6-linux-utils: the s6-devd program</title> - <meta name="Description" content="s6-linux-utils: the s6-devd program" /> - <meta name="Keywords" content="s6 linux administration root utilities devd mdev udev s6-uevent-listener s6-uevent-spawner" /> - <!-- <link rel="stylesheet" type="text/css" href="//skarnet.org/default.css" /> --> - </head> -<body> - -<p> -<a href="index.html">s6-linux-utils</a><br /> -<a href="//skarnet.org/software/">Software</a><br /> -<a href="//skarnet.org/">skarnet.org</a> -</p> - -<h1> The <tt>s6-devd</tt> program </h1> - -<p> -<tt>s6-devd</tt> listens to the netlink interface for udev events, and -launches a helper program for every event, similarly to what the hotplug -interface does. -</p> - -<h2> Interface </h2> - -<pre> - s6-devd [ -q | -v ] [ -b <em>kbufsz</em> ] [ -l <em>linevar</em> ] [ -t l:t:k ] <em>prog...</em> -</pre> - -<ul> - <li> s6-devd rewrites its command line into -<tt><a href="s6-uevent-listener.html">s6-uevent-listener</a> <tt>|</tt> -<a href="s6-uevent-spawner.html">s6-uevent-spawner</a> <em>prog...</em></tt>, -dispatching its options to the appropriate programs; then it execs into -this new command line. It does nothing else: it's just a wrapper. </li> - <li> The first executed program, -<a href="s6-uevent-listener.html">s6-uevent-listener</a>, -will listen to the netlink and pass the events sequentially to -<a href="s6-uevent-spawner.html">s6-uevent-spawner</a>, which will -spawn a <em>prog...</em> helper for every event. </li> -</ul> - -<h2> Options </h2> - -<ul> - <li> <tt>-q</tt> : be more quiet. </li> - <li> <tt>-v</tt> : be more verbose. </li> - <li> <tt>-b</tt> <em>kbufsz</em> : try and reserve a kernel buffer of -<em>kbufsz</em> bytes for the netlink queue. Too large a buffer wastes kernel memory; -too small a buffer risks losing events. The default is 65536. </li> - <li> <tt>-l</tt> <em>linevar</em> : the short description of the -event, given by the kernel as the first string in the netlink message, -will be made available to <em>prog</em> under the environment variable -named <em>linevar</em>. </li> - <li> <tt>-t</tt> <em>l:t:k</em> : If <em>l</em>, <em>t</em> or <em>k</em> is -specified, they specify timeouts; by default, they are infinite. -If <em>prog...</em> is still alive after <em>l</em> milliseconds, s6-devd sends -it a SIGTERM. Then, if <em>prog...</em> is still alive after <em>t</em> more -milliseconds, s6-devd sends it a SIGKILL. Then, if <em>prog...</em> is still -alive after <em>k</em> more milliseconds, s6-devd yells and exits 99. </li> -</ul> - -<h2> Notes </h2> - -<ul> - <li> s6-devd is a daemon; it should be run under a proper supervision system such -as <a href="//skarnet.org/software/s6/">s6</a>. The real long-lived -process is named <a href="s6-uevent-listener.html">s6-uevent-listener</a>; -ir runs with the same pid as s6-devd. </li> - <li> The <em>prog...</em> helper, on the other hand, should be very short-lived, -even if you are not using the <tt>-t</tt> option to s6-devd. Since helpers are -spawned sequentially, slow helpers can make events queue up and fill buffers -along the way. </li> -</ul> - -</body> -</html> |