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| author | Laurent Bercot <ska-skaware@skarnet.org> | 2014-12-05 22:26:11 +0000 |
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| committer | Laurent Bercot <ska-skaware@skarnet.org> | 2014-12-05 22:26:11 +0000 |
| commit | 90b12bd71bb9fc79a4640b9112c13ef529d0196a (patch) | |
| tree | 523b3f4ee2969e7a729bab2ba749c4b924ae62af /doc/s6-fghack.html | |
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diff --git a/doc/s6-fghack.html b/doc/s6-fghack.html new file mode 100644 index 0000000..ba3f351 --- /dev/null +++ b/doc/s6-fghack.html @@ -0,0 +1,50 @@ +<html> + <head> + <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> + <meta http-equiv="Content-Language" content="en" /> + <title>s6: the s6-fghack program</title> + <meta name="Description" content="s6: the s6-fghack program" /> + <meta name="Keywords" content="s6 command s6-fghack foreground program background hack anti-backgrounding tool" /> + <!-- <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 s6-fghack program </h1> + +<p> +s6-fghack is an anti-backgrounding tool. +</p> + +<h2> Interface </h2> + +<pre> + s6-fghack <em>prog...</em> +</pre> + +<ul> + <li> s6-fghack opens a lot of file descriptors (all writing to a single pipe). </li> + <li> Then it forks and executes <em>prog...</em>. </li> + <li> If something gets written on one of those descriptors, it's a bug in <em>prog</em>. +s6-fghack then complains and exits 102. </li> + <li> Unless <em>prog...</em> goes out of its way to close descriptors it does know about, +s6-fghack is able to detect when <em>prog...</em> exits. It exits with the same exit +code (or 111 if <em>prog...</em> has crashed). </li> +</ul> + +<h2> Notes </h2> + +<p> + s6-fghack is what it says: a hack. Ideally, you should never have to use it. +It is only useful when you want to supervise a daemon that does not provide a +"stay in the foreground" option; and even then, the right thing is to report +this as a bug to the daemon author and have it fixed. +</p> + +</body> +</html> |