blob: 04670cd871ed97e682ef80e7f05225cd3f6baed7 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
|
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<meta http-equiv="Content-Language" content="en" />
<title>s6-networking: the s6-ipcserver-socketbinder program</title>
<meta name="Description" content="s6-networking: the s6-ipcserver-socketbinder program" />
<meta name="Keywords" content="s6-networking s6-ipcserver-socketbinder ipcserver ucspi socket bind listen" />
<!-- <link rel="stylesheet" type="text/css" href="http://skarnet.org/default.css" /> -->
</head>
<body>
<p>
<a href="index.html">s6-networking</a><br />
<a href="http://skarnet.org/software/">Software</a><br />
<a href="http://skarnet.org/">skarnet.org</a>
</p>
<h1> The <tt>s6-ipcserver-socketbinder</tt> program </h1>
<p>
<tt>s6-ipcserver-socketbinder</tt> binds a Unix domain
socket, then executes a program.
</p>
<h2> Interface </h2>
<pre>
s6-ipcserver-socketbinder [ -d | -D ] [ -b <em>backlog</em> ] <em>path</em> <em>prog...</em>
</pre>
<ul>
<li> s6-ipcserver-socketbinder creates a Unix domain socket of type SOCK_STREAM
and binds it to <em>path</em>. It prepares the socket to accept
connections by calling
<a href="http://pubs.opengroup.org/onlinepubs/9699919799/functions/listen.html">listen()</a>. </li>
<li> It then execs into <em>prog...</em> with the open socket
as its standard input. </li>
<h2> Options </h2>
<ul>
<li> <tt>-d</tt> : allow instant rebinding to the same path
even if it has been used not long ago - this is the SO_REUSEADDR flag to
<a href="http://pubs.opengroup.org/onlinepubs/9699919799/functions/setsockopt.html">setsockopt()</a>
and is generally used with server programs. This is the default. Note that
<em>path</em> will be deleted if it already exists at program start time. </li>
<li> <tt>-D</tt> : disallow instant rebinding to the same path. </li>
<li> <tt>-b <em>backlog</em></tt> : set a maximum of
<em>backlog</em> backlog connections on the socket. Extra
connection attempts will rejected by the kernel. </li>
</ul>
<h2> Notes </h2>
<ul>
<li> s6-ipcserver-socketbinder is part of a set of basic blocks used to
build a flexible Unix super-server. It normally should be given a
command line crafted to make it execute into
<a href="s6-ipcserverd.html">s6-ipcserverd</a> to accept connections
from clients, or into a program such as
<a href="http://skarnet.org/software/s6/s6-applyuidgid.html">s6-applyuidgid</a>
to drop privileges before doing so. </li>
<li> The <a href="s6-ipcserver.html">s6-ipcserver</a> program does
exactly this. It implements
a full Unix super-server by building a command line starting with
s6-ipcserver-socketbinder and ending with s6-ipcserverd followed by the
application program, and executing into it. </li>
</ul>
</body>
</html>
|
