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Initial Spring 2016 commit.

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Geoffrey Challen
2015-12-23 00:50:04 +00:00
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# Man pages for miscellaneous stuff
TOP=../..
.include "$(TOP)/mk/os161.config.mk"
MANDIR=/man/misc
MANFILES=index.html
.include "$(TOP)/mk/os161.man.mk"

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<!--
Copyright (c) 2000, 2001, 2002, 2003, 2004, 2005, 2008, 2009, 2013
The President and Fellows of Harvard College.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
3. Neither the name of the University nor the names of its contributors
may be used to endorse or promote products derived from this software
without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE UNIVERSITY AND CONTRIBUTORS ``AS IS'' AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE UNIVERSITY OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
SUCH DAMAGE.
-->
<html>
<head>
<title>OS/161 Miscellaneous Docs</title>
<link rel="stylesheet" type="text/css" media="all" href="../manindex.css">
</head>
<body bgcolor=#ffffff>
<h2 align=center>OS/161 Miscellaneous Docs</h2>
<p align=center>
<A HREF=..>Top</A> |
<A HREF=../bin>Binaries</A> |
<A HREF=../sbin>Sysadmin binaries</A> |
<A HREF=../testbin>Test binaries</A> |
<A HREF=../syscall>System calls</A> |
<A HREF=../libc>C standard library</A> |
<A HREF=../dev>Device drivers</A>
</p>
<br>
<ul>
<li> <A HREF=semfs.html>semfs</A> - userland semaphore file system
</ul>
</body>
</html>

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<!--
Copyright (c) 2014
The President and Fellows of Harvard College.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
3. Neither the name of the University nor the names of its contributors
may be used to endorse or promote products derived from this software
without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE UNIVERSITY AND CONTRIBUTORS ``AS IS'' AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE UNIVERSITY OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
SUCH DAMAGE.
-->
<html>
<head>
<title>semfs</title>
<link rel="stylesheet" type="text/css" media="all" href="../man.css">
</head>
<body bgcolor=#ffffff>
<h2 align=center>semfs</h2>
<h4 align=center>OS/161 Reference Manual</h4>
<h3>Name</h3>
<p>
semfs - semaphore filesystem
</p>
<h3>Synopsis</h3>
<p>
options semfs
</p>
<h3>Description</h3>
<p>
semfs is a simple "fake" (memory-only) file system that provides
synchronization facilities to userland in the form of counting
semaphores.
There is one semfs instance, called "sem:", which is created and
mounted during system boot.
</p>
<p>
Semaphores in semfs appear as files in "sem:". To create a semaphore,
open such a file using <tt>O_CREAT</tt>. To destroy it, remove it with
<tt>remove()</tt>.
</p>
<p>
To use the semaphore, write one byte to increase the semaphore count
by one (the "V" operation) and write one byte to decrease the
semaphore count by one (the "P" operation). The count will not
decrease below zero; attempts to do so will block until other
concurrent write operations raise the count again.
You can also set the count explicitly using <tt>ftruncate()</tt>; this
is useful for initializing a semaphore to a nonzero value. Note that
no data is actually transferred by the read and write calls; it is
acceptable to pass NULL as the data pointer.
</p>
<p>
You can create as many semaphores as you want (until memory runs out
or the directory reaches 2^32 entries); however, semfs does not
support subdirectories, hard links of semaphores, or renaming.
</p>
<h3>Files</h3>
<p>
<tt>sem:</tt>
</p>
</body>
</html>