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| author | Laurent Bercot <ska-skaware@skarnet.org> | 2015-01-15 20:14:44 +0000 |
|---|---|---|
| committer | Laurent Bercot <ska-skaware@skarnet.org> | 2015-01-15 20:14:44 +0000 |
| commit | 87c5b2118efcee65eeda3f743d081ea9c2b866d9 (patch) | |
| tree | 31ca07d6134adf44bc3d58f4fcf4ea8be9cb7dbb /doc/libftrigw.html | |
| parent | cd2500fcc704287c4994a3253b593593c867913e (diff) | |
| download | s6-87c5b2118efcee65eeda3f743d081ea9c2b866d9.tar.xz | |
Move Unix domain utilities and access control utilites,
as well as the accessrules library, from s6-networking to here
Diffstat (limited to 'doc/libftrigw.html')
| -rw-r--r-- | doc/libftrigw.html | 115 |
1 files changed, 0 insertions, 115 deletions
diff --git a/doc/libftrigw.html b/doc/libftrigw.html deleted file mode 100644 index d625f2b..0000000 --- a/doc/libftrigw.html +++ /dev/null @@ -1,115 +0,0 @@ -<html> - <head> - <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> - <meta http-equiv="Content-Language" content="en" /> - <title>s6: the ftrigw library interface</title> - <meta name="Description" content="s6: the ftrigw library interface" /> - <meta name="Keywords" content="s6 ftrig notification notifier writer libftrigw ftrigw library interface" /> - <!-- <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>ftrigw</tt> library interface </h1> - -<p> - The <tt>ftrigw</tt> library provides an API for notifiers, i.e. -programs that want to regularly announce what they're doing. -</p> - -<p> - Notifiers should create a fifodir in a hardcoded place in the -filesystem, and document its location. Listeners will then be -able to subscribe to that fifodir, and receive the events. -</p> - -<h2> Compiling </h2> - -<ul> - <li> Make sure the s6 headers, as well as the skalibs headers, -are visible in your header search path. </li> - <li> Use <tt>#include <s6/ftrigw.h></tt> </li> -</ul> - -<h2> Linking </h2> - -<ul> - <li> Make sure the s6 libraries, as well as the skalibs libraries, -are visible in your library search path. </li> - <li> Link against <tt>-ls6</tt> and <tt>-lskarnet</tt>. </li> -</ul> - -<h2> Programming </h2> - -<p> - Check the <tt>s6/ftrigw.h</tt> header for the -exact function prototypes. -</p> - -<h3> Creating a fifodir </h3> - -<pre> -char const *path = "/var/lib/myservice/fifodir" ; -int gid = -1 ; -int forceperms = 0 ; -int r = ftrigw_fifodir_make(path, gid, forceperms) ; -</pre> - -<p> -<tt>ftrigw_fifodir_make</tt> creates a fifodir at the <tt>path</tt> location. -It returns 0, and sets errno, if an error occurs. -It returns 1 if it succeeds. <br /> -If a fifodir, owned by the user, already exists at <tt>path</tt>, and -<tt>forceperms</tt> is zero, then <tt>ftrigw_fifodir_make</tt> immediately -returns a success. If <tt>forceperms</tt> is nonzero, then -it tries to adjust <tt>path</tt>'s permissions before returning. -</p> - -<p> -If <tt>gid</tt> is negative, then <tt>path</tt> is created "public". -Any listener will be able to subscribe to <tt>path</tt>. -If <tt>gid</tt> is nonnegative, then <tt>path</tt> is created "private". -Only processes belonging to group <tt>gid</tt> will be able to -subscribe to <tt>path</tt>. -</p> - -<h3> Sending an event </h3> - -<pre> -char event = 'a' ; -r = ftrigw_notify(path, event) ; -</pre> - -<p> -<tt>ftrigw_notify</tt> sends <tt>event</tt> to all the processes that are -currently subscribed to <tt>path</tt>. -It returns -1 if an error occurs, or the number of successfully notified -processes. -</p> - -<h3> Cleaning up </h3> - -<p> -When stray KILL signals hit <a href="s6-ftrigrd.html">s6-ftrigrd</a> processes, -1. it's a sign of incorrect system administration, 2. they can leave -unused named pipes in the fifodir. It's the fifodir's owner's job, i.e. -the notifier's job, to periodically do some housecleaning and remove -those unused pipes. -</p> - -<pre> -r = ftrigw_clean(path) ; -</pre> - -<p> -<tt>ftrigw_clean</tt> cleans <tt>path</tt>. It returns 0, and sets errno, -if it encounters an error. It returns 1 if it succeeds. -</p> - -</body> -</html> |