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<title>FBB::Syslogbuf</title>
<link rev="made" href="mailto:Frank B. Brokken: f.b.brokken@rug.nl">
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<body text="#27408B" bgcolor="#FFFAF0">
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<h1>FBB::Syslogbuf</h1>
<h2>libbobcat-dev_3.19.01-x.tar.gz</h2>
<h2>2005-2013</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::Syslogbuf(3bobcat)</title>
<link rev="made" href="mailto:Frank B. Brokken: f.b.brokken@rug.nl">
</head>
<body text="#27408B" bgcolor="#FFFAF0">
<hr>
<h1>FBB::Syslogbuf(3bobcat)</h1>
<h2>libbobcat-dev_3.19.01-x.tar.gz Stream Buffer for Syslog</h2>
<h2>2005-2013</h2>
<p>
<h2>NAME</h2>FBB::Syslogbuf - A streambuf object inserting syslog messages
<p>
<h2>SYNOPSIS</h2>
<strong>#include <bobcat/syslogbuf></strong><br>
Linking option: <em>-lbobcat</em>
<p>
<h2>DESCRIPTION</h2>
Addresses of <strong>FBB::Syslogbuf</strong> objects can be passed as
<strong>std::streambuf</strong> addresses to <em>std::ostream</em> objects to write messages to
the syslog daemon using stream facilities.
<p>
Multiple separate insertions can be used to create a single syslog message:
the message is only sent to the syslog daemon after receiving a <em>flush</em>
command (e.g., after inserting <em>std::flush</em> or <em>std::endl</em>). Non-printable
characters (like <em>'\n'</em>) show up in the syslog message as octal values,
preceded by <em>#</em> (e.g., <em>#012</em> for <em>'\n'</em>). The newline normally inserted
by <em>std::endl</em> is ignored: <strong>SyslogStream</strong> objects interpret <em>std::endl</em>
like <em>std::flush</em>.
<p>
One series of insertions may contain multiple <em>std::endl</em> or <em>std::flush</em>
manipulators. At each of these manipulators a new message is sent to the
syslog daemon, containing all info that has so far been buffered. After
sending a message to the syslog daemon, the <strong>SyslogStream</strong>'s internal buffer
is cleared.
<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</strong>
<p>
<h2>ENUMERATIONS</h2>
<p>
The following enumerations are defined in the namespace <strong>FBB</strong>:
<p>
<strong>Priority</strong>:
<p>
The values of this enumeration match the corresponding priority
<strong>LOG_xxx</strong> values used with <strong>syslog</strong>(3):
<ul>
<li> <strong>EMERG</strong>:<br>
system is unusable;
<li> <strong>ALERT</strong>:<br>
action must be taken immediately;
<li> <strong>CRIT</strong>:<br>
critical conditions;
<li> <strong>ERR</strong>:<br>
error conditions;
<li> <strong>WARNING</strong>:<br>
warning conditions;
<li> <strong>NOTICE</strong>:<br>
normal, but significant, condition;
<li> <strong>INFO</strong>:<br>
informational message;
<li> <strong>DEBUG</strong>:<br>
debug-level message;
</ul>
<p>
<strong>PriorityType</strong>:
<p>
This enumberation has two values fine-tuning the type of messages that
are actually processed by the syslog daemon:
<ul>
<li> <strong>SINGLE</strong>:<br>
Only messages of the priority specified at the <em>setMask</em> call are
processed by the syslog daemon;
<li> <strong>UPTO</strong>:<br>
Messages of priority <em>EMERG</em> up to the the priority specified at the
<em>setMask</em> call are processed by the syslog daemon;
</ul>
By default, the syslog daemon processes all messages it receives.
<p>
<strong>Facility</strong>:
<p>
The values of this enumeration match the corresponding facility
<strong>LOG_xxx</strong> values used with <strong>syslog</strong>(3):
<ul>
<li> <strong>AUTHPRIV</strong>:<br>
security/authorization messages (private)
<li> <strong>CRON</strong>:<br>
clock daemon (<em>cron</em> and <em>at</em>)
<li> <strong>DAEMON</strong>:<br>
other system daemons
<li> <strong>KERN</strong>:<br>
kernel messages
<li> <strong>LOCAL0</strong>:<br>
reserved for local use. <strong>LOCAL1</strong> through <strong>LOCAL7</strong> are
available as well.
<li> <strong>LPR</strong>:<br>
line printer subsystem
<li> <strong>MAIL</strong>:<br>
mail subsystem
<li> <strong>NEWS</strong>:<br>
<em>USENET</em> news subsystem
<li> <strong>SYSLOGBUF</strong>:<br>
messages generated internally by <em>syslogbufd</em>
<li> <strong>USER</strong>:<br>
generic user-level messages
<li> <strong>UUCP</strong>:<br>
UUCP subsystem
</ul>
<p>
<h2>CONSTRUCTORS</h2>
<ul>
<li> <strong>Syslogbuf(string const &ident = "",
FBB::Priority priority = FBB::NOTICE,
FBB::Facility facility = FBB::USER,
int option = 0)</strong>:<br>
This constructor initializes a <strong>Syslogbuf</strong> object. The
<em>ident</em> parameter is usually the name of the program. Its contents are
prepended to syslog messages.
<p>
The <em>priority</em> parameter determines the default importance of the message
sent to the syslog daemon. By default messages are sent to the syslog daemon
with priority <strong>FBB::NOTICE</strong>. Syslog messages may be given different priority
by inserting a <strong>SyslogStream</strong>(3bobcat) manipulator. The priority set at
construction time may also be modified using the <em>setPriority</em> and
<em>setDefaultPriority</em> members.
<p>
Which messages actually appear in log facilities is not determined by
the messages' priorities, but by syslog's <em>log mask</em>. The log mask can be
set by the static member <em>setMask</em> (see below).
<p>
The <em>facility</em> parameter determines the type of program doing the
logging. By default <strong>FBB::USER</strong> is used.
<p>
The <em>option</em> parameter may be used to specify various options (use the
binary `<em>bitor</em>' (`<em>|</em>') operator to combine options):
<p>
<strong>LOG_CONS</strong>:
write directly to system console if there is an
error while sending to system logger <br>
<strong>LOG_NDELAY</strong>:
open the connection immediately (normally, the con-
nection is opened when the first message is logged) <br>
<strong>LOG_PERROR</strong>:
print to stderr as well <br>
<strong>LOG__PID</strong>:
include PID with each message <br>
<p>
By default no options are used.
<p>
<li> <strong>Syslogbuf(char const *ident,
FBB::Priority priority = FBB::NOTICE,
FBB::Facility facility = FBB::USER,
int option = 0)</strong>:<br>
This constructor is kept for backward compatibility. Its parameters
have the same meanings as those of the abovementioned constructor. A
<em>nullptr</em> indicates that no text needs to be prepended to syslog messages.
</ul>
<p>
Copy and move constructors are not available.
<p>
<h2>MEMBER FUNCTIONS</h2>
<p>
All members of <strong>std::streambuf</strong> are available, as <strong>FBB::Syslogbuf</strong>
inherits from this class.
<p>
<ul>
<li> <strong>void close()</strong>:<br>
If the <strong>SyslogStream</strong>'s internal buffer is not empty it is flushed to
the syslog daemon. Thereafer <strong>closelog</strong>(3) is called.
<li> <strong>Priority defaultPriority() const</strong>:<br>
Returns the current default priority. I.e., the priority that will be
used for the messages after inserting <em>endl</em> or <em>flush</em>.
<li> <strong>void open(string const &ident,
FBB::Priority priority = FBB::NOTICE,
FBB::Facility facility = FBB::USER,
int option = 0)</strong>:<br>
Redefines the current identifier, priority, facility and options that
are used when sending messages to the syslog daemon. If the
<strong>SyslogStream</strong>'s internal buffer is not empty it is first flushed to
the syslog daemon using the identifier, priority and options that were
active just before calling <em>open</em>.
<li> <strong>Priority priority() const</strong>:<br>
Returns the next priority. I.e., the priority that will be used for
the next message that is sent to the syslog daemon.
<li> <strong>Priority setDefaultPriority(Priority priority)</strong>:<br>
Changes the default priority of the next message that is sent to the
syslog daemon after inserting <em>std::eoln</em> or
<em>std::flush</em>. The previously active default priority is
returned.
<li> <strong>Priority setPriority(Priority priority)</strong>:<br> Changes the priority for the
next message that is sent to the syslog daemon after inserting
<em>std::eoln</em> or <em>std::flush</em>. Subsequent messages will again use
the default priority. The previously active priority setting is
returned.
</ul>
<p>
<h2>PROTECTED MEMBER FUNCTION</h2>
<p>
The member listed in this section implements the tasks of the comparably
named virtual function in the class's private interface. This separates the
redefinable interface from the user-interface. The class <strong>Syslogbuf</strong>
can, in accordance with Liskov's Substitution Principle, be used as a
<em>std:streambuf</em>; but it also offers a facility for classes deriving from
<strong>Syslogbuf</strong>.
<ul>
<li> <strong>int pSync()</strong>:<br>
The contents of the <strong>Syslogbuf</strong>'s internal buffer are flushed to the
syslog daemon.
</ul>
<p>
<h2>EXAMPLE</h2>
See also <strong>syslogstream</strong>(3bobcat)
<p>
<pre>
#include <iostream>
#include <bobcat/syslogstream>
using namespace std;
using namespace FBB;
int main(int argc, char **argv)
{
ostream sls(new Syslogbuf(argv[0]));
sls << SyslogStream::debug << "Hello world" << flush <<
SyslogStream::strerrno << endl;
}
</pre>
<p>
<h2>FILES</h2>
<em>bobcat/syslogbuf</em> - defines the class interface
<p>
<h2>SEE ALSO</h2>
<strong>bobcat</strong>(7), <strong>closelog</strong>(3), <strong>openlog</strong>(3), <strong>rsyslogd</strong>(8)
<strong>syslog</strong>(3), <strong>syslogstream</strong>(3bobcat)
<p>
<h2>BUGS</h2>
The constructor's <em>option</em> parameter is an <em>int</em>. Because of this,
<em>int</em> values rather than enumeration values are passed to the
constructor. It is the responsibility of the programmer to pass defined option
values only.
<p>
<h2>DISTRIBUTION FILES</h2>
<ul>
<li> <em>bobcat_3.19.01-x.dsc</em>: detached signature;
<li> <em>bobcat_3.19.01-x.tar.gz</em>: source archive;
<li> <em>bobcat_3.19.01-x_i386.changes</em>: change log;
<li> <em>libbobcat1_3.19.01-x_*.deb</em>: debian package holding the
libraries;
<li> <em>libbobcat1-dev_3.19.01-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>
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