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<html><head>
<title>FBB::SharedStreambuf</title>
<link rev="made" href="mailto:Frank B. Brokken: f.b.brokken@rug.nl">
</head>
<body text="#27408B" bgcolor="#FFFAF0">
<hr>
<h1>FBB::SharedStreambuf</h1>
<h2>libbobcat-dev_3.23.01-x.tar.gz</h2>
<h2>2005-2014</h2>

<html><head>
<link rev="made" href="mailto:Frank B. Brokken: f.b.brokken@rug.nl">
</head>
<body text="#27408B" bgcolor="#FFFAF0">
<hr>
<h1></h1>

<html><head>
<title>FBB::SharedStreambuf(3bobcat)</title>
<link rev="made" href="mailto:Frank B. Brokken: f.b.brokken@rug.nl">
</head>
<body text="#27408B" bgcolor="#FFFAF0">
<hr>
<h1>FBB::SharedStreambuf(3bobcat)</h1>
<h2>libbobcat-dev_3.23.01-x.tar.gz Error handler</h2>
<h2>2005-2014</h2>


<p>
<h2>NAME</h2>FBB::SharedStreambuf - streambuf interfacing to shared memory
<p>
<h2>SYNOPSIS</h2>
    <strong>#include &lt;bobcat/sharedstreambuf&gt;</strong><br>
    Linking option: <em>-lpthread -lbobcat</em> 
<p>
<h2>DESCRIPTION</h2>
    This class implements a specialization of the <strong>std::streambuf</strong> class,
allowing stream classes (<em>std::istream, std::ostream, FBB::ISharedStream,
FBB::OSharedStream</em> and <em>FBB::SharedStream</em>) to perform I/O operations on
shared memory. <strong>FBB::SharedStreambuf</strong> objects interface to a
<em>FBB::SharedMemory</em> objects.
<p>
<h2>NAMESPACE</h2>
    <strong>FBB</strong><br>
    All constructors, members, operators and manipulators, mentioned in this
man-page, are defined in the namespace <strong>FBB</strong>.
<p>
<h2>INHERITS FROM</h2>
    <strong>std::streambuf, FBB::SharedEnum__</strong> (cf. <strong>sharedmemory(3bobcat)</strong> for
a description of the latter class).
<p>
<h2>SIZEUNIT ENUMERATION</h2>
<p>
The <strong>enum SizeUnit</strong> defines the following symbolic constants:
        <ul>
        <li> <strong>kB</strong>, representing 1024 (2**10) bytes of memory;
        <li> <strong>MB</strong>, representing 1048576 (2**20) bytes of memory;
        <li> <strong>GB</strong>, representing 1073741824 (2**30) bytes of memory
        </ul>
<p>
<h2>CONSTRUCTORS</h2>
    <ul>
    <li> <strong>SharedStreambuf()</strong>:<br>
       The default constructor defines a stub <strong>SharedStreambuf</strong> object that
        cannot immediately be used to access shared memory. Before it can be
        used by, shared stream classes like <em>FBB::SharedStream</em>, its member
        <em>setMemory</em> must first have been called.
<p>
<li> <strong>SharedStreambuf(size_t maxSize, SizeUnit sizeUnit, 
            std::ios::openmode openMode = std::ios::in | std::ios::out,
            size_t access = 0600)</strong>:<br>
       This constructor creates a shared memory segment having a capacity of
        at least <em>maxSize * sizeUnit</em> bytes. 
<p>
By default, the shared memory segment is opened for reading and
        writing. Different from the open modes used for file streams, creating
        a shared memory stream with open modes <em>ios::in | ios::out</em> is
        OK. In this case the shared memory segment is created and once
        information has been written to the shared memory it can also be read
        again. 
<p>
The shared memory's access rights are defined by the <em>access</em>
        parameter, interpreted as an octal value, using the well-known
        (<strong>chmod</strong>(1)) way to define the access rights for owner, group and
        others.
<p>
If construction fails, an <em>FBB::Exception</em> is thrown.
<p>
<li> <strong>SharedStreambuf(int id, std::ios::openmode openMode = std::ios::in |
        std::ios::out)</strong>:<br> 
       This constructor connects to a shared memory segment having ID
        <em>id</em>. 
<p>
Specifying the <em>ios::trunc</em> flag immediately clears the contents of
        the shared memory.
<p>
An <em>FBB::Exception</em> is thrown if construction fails (e.g., no shared
        memory segment having ID <em>id</em> exists),
    </ul>
    Copy and move constructors are not available.
<p>
<h2>OVERLOADED OPERATORS</h2>
<p>
Overloaded move and copy assignment operators are not available.
<p>
<h2>MEMBER FUNCTIONS</h2>
<p>
All members of <strong>std::streambuf</strong> and the <em>enum</em> values <em>kB, MB</em>, and
<em>GB</em>, defined by <em>FBB::SharedEnum__</em> are available.
<p>
<ul>
    <li> <strong>void clear()</strong>:<br>
       The shared memory is first locked. Next, all shared data segment are
        returned to the operating system, after which the shared memory
        segment is unlocked again. Returning from <em>clear</em> the shared memory
        The <strong>FBB::SharedMemory</strong> object is effectively re-initialized, with
        <em>offset</em> and <em>nReadable</em> returning 0.
<p>
<li> <strong>int id() const</strong>:<br>
       The ID of the shared memory segment is returned.
<p>
<li> <strong>void kill()</strong>:<br>
       Without locking the shared memory the <strong>FBB::SharedStreambuf</strong>'s shared
        memory is deleted. The <strong>FBB::SharedStreambuf</strong> object is
        unusable after returning from <em>kill</em>. 
<p>
<li> <strong>void memInfo(std::ostream &amp;out)</strong>:<br>
       Information about the <em>SharedMemory</em> object is inserted into the
        provide <em>ostream</em> object. The IDs of the shared segments, their
        sizes, the maximum number of shared memory segments, the number of
        bytes that can be read from the shared memory, and its actual storage
        capacity, etc., are displayed. The inserted information is not
        terminated by a final newline character.
<p>
<li> <strong>void remove()</strong>:<br>
       The shared memory is locked, and the <strong>FBB::SharedStreambuf</strong>'s shared
        memory is deleted. The <strong>FBB::SharedStreambuf</strong> object is unusable
        after returning from <em>remove</em>. 
<p>
<li> <strong>void setMemory(SharedMemory &amp;&amp;tmp)</strong>:<br>
       The anonymous temporary <em>SharedMemory</em> object that is passed to
        <em>setMemory</em> defines the new shared memory segment to which the
        <strong>FBB::SharedStreambuf</strong> object interfaces. It can also be called
        to reuse a <strong>FBB::SharedStreambuf</strong> object again after calling
        <em>kill</em> or <em>remove</em>.
<p>
<li> <strong>FBB::SharedMemory &amp;sharedMemory()</strong>:<br>
       A reference to the <em>FBB::SharedMemory</em> object to which the
        <strong>FBB::SharedStreambuf</strong> object interfaces is returned.
    </ul>
<p>
<h2>PROTECTED MEMBER FUNCTIONS</h2>
<p>
<ul>
    <ul>
    <li> <strong>FBB::SharedCondition attachSharedCondition(std::ios::off_type offset,
                                        std::ios::seekdir origin)</strong>:<br>
       Returns an <strong>FBB::SharedCondition</strong>(3) object, interfacing to a shared
        condition variable located at offset <em>offset</em> (relative to
        <em>origin</em>) in the <em>SharedMemory</em> object to which the
        <strong>SharedStreamBuf</strong> object interfaces.
<p>
An <em>FBB::Exception</em> is thrown if the <em>FBB::SharedCondition</em> object
        could not be constructed.
<p>
<li> <strong>FBB::SharedCondition createSharedCondition()</strong>:<br>
       Returns an <strong>FBB::SharedCondition</strong>(3) object, interfacing to a newly
        created shared condition variable which is created at the current
        offset of the <em>SharedMemory</em> object to which the <strong>SharedStream</strong>
        object interfaces (or at the first offset of the next physical shared
        memory data block, cf. <strong>sharedcondition</strong>(3bobcat))</ul>.
<p>
An <em>FBB::Exception</em> is thrown if the <em>FBB::SharedCondition</em> object
        could not be constructed.
<p>
<li> <strong>void setOpenMode(std::ios::openmode flag)</strong>:<br>
       The streambuf's <em>openmode</em> is changed to the settings defined by
        <em>flag</em>. This member is used by, e.g., <em>SharedStream::open</em>, to
        adapt the <strong>FBB::SharedStreambuf</strong>'s <em>openmode</em> to the flags that
        are passed to <em>open</em>.
<p>
<li> <strong>FBB::SharedMemory &amp;sharedMemory()</strong>:<br>
       Returns a reference to the <em>FBB::SharedMemory</em> object to which the
        <strong>SharedStreambuf</strong> object interfaces.
    </ul>
<p>
<h2>EXAMPLE</h2>
    See the <strong>sharedstream</strong>(3bobcat) man page.
<p>
<h2>FILES</h2>
    <em>bobcat/sharedstreambuf</em> - defines the class interface
<p>
<h2>SEE ALSO</h2>
    <strong>bobcat</strong>(7),  <strong>chmod</strong>(1),
        <strong>isharedstream</strong>(3bobcat),
        <strong>osharedstream</strong>(3bobcat),
        <strong>sharedblock</strong>(3bobcat), 
        <strong>sharedcondition</strong>(3bobcat), 
        <strong>sharedmemory</strong>(3bobcat)
        <strong>sharedmutex</strong>(3bobcat), 
        <strong>sharedpos</strong>(3bobcat), 
        <strong>sharedreadme</strong>(7bobcat), 
        <strong>sharedsegment</strong>(3bobcat),
        <strong>sharedstream</strong>(3bobcat)
<p>
<h2>BUGS</h2>
    Note that by default exceptions thrown from within a <strong>std::stream</strong>
object are caught by the stream object, setting its <em>ios::failbit</em> flag. To
allow exceptions to leave a stream object, its <em>exceptions</em> member can be
called, e.g., using:
        <pre>

    myStream.exceptions(ios::failbit | ios::badbit | ios::eofbit);
        
</pre>

<p>

<h2>DISTRIBUTION FILES</h2>
    <ul>
    <li> <em>bobcat_3.23.01-x.dsc</em>: detached signature;
    <li> <em>bobcat_3.23.01-x.tar.gz</em>: source archive;
    <li> <em>bobcat_3.23.01-x_i386.changes</em>: change log;
    <li> <em>libbobcat1_3.23.01-x_*.deb</em>: debian package holding the
            libraries;
    <li> <em>libbobcat1-dev_3.23.01-x_*.deb</em>: debian package holding the
            libraries, headers and manual pages;
    <li> <em>http://sourceforge.net/projects/bobcat</em>: public archive location;
    </ul>
<p>
<h2>BOBCAT</h2>
    Bobcat is an acronym of `Brokken's Own Base Classes And Templates'.
<p>
<h2>COPYRIGHT</h2>
    This is free software, distributed under the terms of the 
    GNU General Public License (GPL).
<p>
<h2>AUTHOR</h2>
    Frank B. Brokken (<strong>f.b.brokken@rug.nl</strong>).
<p>