2 files changed, 99 insertions, 102 deletions

diff --git a/doc/RELEASING.md b/doc/RELEASING.md
index 1f9db07..432b1da 100644
--- a/doc/RELEASING.md
+++ b/doc/RELEASING.md
@@ -2,23 +2,23 @@ Releasing a New Monitoring Plugins Version
 ==========================================
 
 Throughout this document, it is assumed that the current Monitoring
-Plugins version is 2.2.1, and that we're about to publish version 2.3.
+Plugins version is 2.3.3, and that we're about to publish version 2.4.
 It is also assumed that the official repository on GitHub is tracked
 using the remote name `monitoring-plugins` (rather than `origin`).
 
 Before you start
 ----------------
 
-- Check Travis CI status.
+- Check Github Actions status.
 - Update local Git repository to the current `master` tip.  For a
-  maintenance release (e.g., version 2.2.2), update to the current
-  `maint-2.2` tip, instead.
+  maintenance release (e.g., version 2.3.4), update to the current
+  `maint-2.3` tip, instead.
 
 Prepare and commit files
 ------------------------
 
 - Update `configure.ac` and `NP-VERSION-GEN` with new version.
-- Update `NEWS` from `git log --reverse v2.2.1..` output, and specify
+- Update `NEWS` from `git log --reverse v2.3.3..` output, and specify
   the release version/date.
 - Update `AUTHORS` if there are new team members.
 - Update `THANKS.in` using `tools/update-thanks`.
@@ -29,59 +29,59 @@ Prepare and commit files
 Create annotated tag
 --------------------
 
-    git tag -a -m 'Monitoring Plugins 2.3' v2.3
+    git tag -a -m 'Monitoring Plugins 2.4' v2.4
 
 Push the code and tag to GitHub
 -------------------------------
 
     git push monitoring-plugins master
-    git push monitoring-plugins v2.3
+    git push monitoring-plugins v2.4
 
 Create new maintenance branch
 -----------------------------
 
 _Only necessary when creating a feature release._
 
-    git checkout -b maint-2.3 v2.3
-    git push -u monitoring-plugins maint-2.3
+    git checkout -b maint-2.4 v2.4
+    git push -u monitoring-plugins maint-2.4
 
 Checkout new version
 --------------------
 
     rm -rf /tmp/plugins
-    git archive --prefix=tmp/plugins/ v2.3 | (cd /; tar -xf -)
+    git archive --prefix=tmp/plugins/ v2.4 | (cd /; tar -xf -)
 
 Build the tarball
 -----------------
 
     cd /tmp/plugins
-    tools/setup
+    tools/setup     # requires docbook to be installed
     ./configure
     make dist
 
 Upload tarball to web site
 --------------------------
 
-    scp monitoring-plugins-2.3.tar.gz \
+    scp monitoring-plugins-2.4.tar.gz \
         plugins@orwell.monitoring-plugins.org:web/download/
 
 Generate SHA1 checksum file on web site
 ---------------------------------------
 
     ssh plugins@orwell.monitoring-plugins.org \
-        '(cd web/download; $HOME/bin/create-checksum monitoring-plugins-2.3.tar.gz)'
+        '(cd web/download; $HOME/bin/create-checksum monitoring-plugins-2.4.tar.gz)'
 
 Announce new release
 --------------------
 
 - In the site.git repository:
 
-    - Create `web/input/news/release-2-3.md`.
+    - Create `web/input/news/release-2-4.md`.
     - Update the `plugins_release` version in `web/macros.py`.
     - Commit and push the result:
 
-            git add web/input/news/release-2-3.md
-            git commit web/input/news/release-2-3.md web/macros.py
+            git add web/input/news/release-2-4.md
+            git commit web/input/news/release-2-4.md web/macros.py
             git push origin master
 
 - Post an announcement on (at least) the following mailing lists:
@@ -93,6 +93,6 @@ Announce new release
 
 If you want to mention the number of contributors in the announcement:
 
-    git shortlog -s v2.2.1..v2.3 | wc -l
+    git shortlog -s v2.3.3..v2.4 | wc -l
 
 <!-- vim:set filetype=markdown textwidth=72: -->
diff --git a/doc/developer-guidelines.sgml b/doc/developer-guidelines.sgml
index 6f31f36..37c963e 100644
--- a/doc/developer-guidelines.sgml
+++ b/doc/developer-guidelines.sgml
@@ -13,7 +13,7 @@
 
     <pubdate>2013</pubdate>
     <title>Monitoring Plugins Development Guidelines</title>
-        
+
     <revhistory>
        <revision>
           <revnumber>1796</revnumber>
@@ -31,7 +31,7 @@
 
 <preface id="preface"><title>Preface</title>
     <para>The purpose of this guidelines is to provide a reference for
-    the plugin developers and encourage the standarization of the
+    the plugin developers and encourage the standardization of the
     different kind of plugins: C, shell, perl, python, etc.</para>
 
         <para>Monitoring Plugins Development Guidelines Copyright (C) 2000-2013
@@ -72,14 +72,14 @@
 </section>
 
 <section id="PlugOutput"><title>Plugin Output for Nagios</title>
-        
-                <para>You should always print something to STDOUT that tells if the 
-                service is working or why it is failing. Try to keep the output short - 
-                probably less that 80 characters. Remember that you ideally would like 
+
+                <para>You should always print something to STDOUT that tells if the
+                service is working or why it is failing. Try to keep the output short -
+                probably less that 80 characters. Remember that you ideally would like
                 the entire output to appear in a pager message, which will get chopped
                 off after a certain length.</para>
 
-                <para>As Nagios does not capture stderr output, you should only output to 
+                <para>As Nagios does not capture stderr output, you should only output to
                 STDOUT and not print to STDERR.</para>
 
                 <section><title>Print only one line of text</title>
@@ -101,7 +101,7 @@
                 SERVICE STATUS: Information text
                 </literallayout>
                 <para>However, note that this is not a requirement of the API, so you cannot depend on this
-                being an accurate reflection of the status of the service - the status should always 
+                being an accurate reflection of the status of the service - the status should always
                 be determined by the return code.</para>
                 </section>
 
@@ -148,7 +148,7 @@
                 <para>Code and output should try to respect the 80x25 size of a
                 crt (remember when fixing stuff in the server room!)</para>
                 </section>
-                
+
                 <section><title>Plugin Return Codes</title>
                 <para>The return codes below are based on the POSIX spec of returning
                 a positive value.  Netsaint prior to v0.0.7 supported non-POSIX
@@ -157,11 +157,11 @@
 
                 <para>Note: Some plugins will on occasion print on STDOUT that an error
                 occurred and error code is 138 or 255 or some such number.  These
-                are usually caused by plugins using system commands and having not 
+                are usually caused by plugins using system commands and having not
                 enough checks to catch unexpected output.  Developers should include a
                 default catch-all for system command output that returns an UNKNOWN
                 return code.</para>
-                
+
                 <table id="ReturnCodes"><title>Plugin Return Codes</title>
                         <tgroup cols="3">
                                 <thead>
@@ -175,20 +175,20 @@
                                         <row>
                                                 <entry align="center"><para>0</para></entry>
                                                 <entry valign="middle"><para>OK</para></entry>
-                                                <entry><para>The plugin was able to check the service and it 
+                                                <entry><para>The plugin was able to check the service and it
                                                 appeared to be functioning properly</para></entry>
                                         </row>
                                         <row>
                                                 <entry align="center"><para>1</para></entry>
                                                 <entry valign="middle"><para>Warning</para></entry>
-                                                <entry><para>The plugin was able to check the service, but it 
-                                                appeared to be above some "warning" threshold or did not appear 
+                                                <entry><para>The plugin was able to check the service, but it
+                                                appeared to be above some "warning" threshold or did not appear
                                                 to be working properly</para></entry>
                                         </row>
                                         <row>
                                                 <entry align="center"><para>2</para></entry>
                                                 <entry valign="middle"><para>Critical</para></entry>
-                                                <entry><para>The plugin detected that either the service was not 
+                                                <entry><para>The plugin detected that either the service was not
                                                 running or it was above some "critical" threshold</para></entry>
                                         </row>
                                         <row>
@@ -207,7 +207,7 @@
                         </tgroup>
                 </table>
 
-      
+
                 </section>
 
                 <section id="thresholdformat"><title>Threshold and ranges</title>
@@ -218,7 +218,7 @@
                 set_thresholds(thresholds *, char *, char *) function to set the thresholds.
                 </para>
                 <para>The theory is that the plugin will do some sort of check which returns
-                back a numerical value, or metric, which is then compared to the warning and 
+                back a numerical value, or metric, which is then compared to the warning and
                 critical thresholds. Use the get_status(double, thresholds *) function to
                 compare the value against the thresholds.</para>
                 <para>This is the generalised format for ranges:</para>
@@ -226,14 +226,14 @@
                 <literallayout>
                 [@]start:end
                 </literallayout>
-        
+
                 <para>Notes:</para>
                 <orderedlist>
                 <listitem><para>start &le; end</para>
                         </listitem>
                 <listitem><para>start and ":" is not required if start=0</para>
                         </listitem>
-                <listitem><para>if range is of format "start:" and end is not specified, 
+                <listitem><para>if range is of format "start:" and end is not specified,
                         assume end is infinity</para>
                         </listitem>
                 <listitem><para>to specify negative infinity, use "~"</para>
@@ -245,7 +245,7 @@
                         (inclusive of endpoints)</para>
                         </listitem>
                 </orderedlist>
-                
+
                 <para>Note: Not all plugins are coded to expect ranges in this format yet.
                 There will be some work in providing multiple metrics.</para>
 
@@ -344,7 +344,7 @@
                         </listitem>
                 <listitem><para>label can contain any characters except the equals sign or single quote (')</para>
                         </listitem>
-                <listitem><para>the single quotes for the label are optional. Required if 
+                <listitem><para>the single quotes for the label are optional. Required if
                         spaces are in the label</para>
                         </listitem>
                 <listitem><para>label length is arbitrary, but ideally the first 19 characters
@@ -353,7 +353,7 @@
                         </listitem>
                 <listitem><para>to specify a quote character, use two single quotes</para>
                         </listitem>
-                <listitem><para>warn, crit, min or max may be null (for example, if the threshold is 
+                <listitem><para>warn, crit, min or max may be null (for example, if the threshold is
                         not defined or min and max do not apply). Trailing unfilled semicolons can be
                         dropped</para>
                         </listitem>
@@ -363,18 +363,18 @@
                         same UOM. value may be a literal "U" instead, this would indicate that the
                         actual value couldn't be determined</para>
                         </listitem>
-                <listitem><para>warn and crit are in the range format (see 
+                <listitem><para>warn and crit are in the range format (see
                         <xref linkend="thresholdformat">). Must be the same UOM</para>
                         </listitem>
                 <listitem><para>UOM (unit of measurement) is one of:</para>
                         <orderedlist>
-                        <listitem><para>no unit specified - assume a number (int or float) 
+                        <listitem><para>no unit specified - assume a number (int or float)
                                 of things (eg, users, processes, load averages)</para>
                                 </listitem>
                         <listitem><para>s - seconds (also us, ms)</para></listitem>
                         <listitem><para>% - percentage</para></listitem>
                         <listitem><para>B - bytes (also KB, MB, TB)</para></listitem>
-                        <listitem><para>c - a continous counter (such as bytes
+                        <listitem><para>c - a continuous counter (such as bytes
                                 transmitted on an interface)</para></listitem>
                         </orderedlist>
                         </listitem>
@@ -385,9 +385,9 @@
                 </section>
 
         <section><title>Translations</title>
-        <para>If possible, use translation tools for all output to respect the user's language 
-                settings. See <xref linkend="translationsdevelopers"> for guidelines 
-                for the core plugins. 
+        <para>If possible, use translation tools for all output to respect the user's language
+                settings. See <xref linkend="translationsdevelopers"> for guidelines
+                for the core plugins.
         </para>
         </section>
 </section>
@@ -397,7 +397,7 @@
                 <section><title>Don't execute system commands without specifying their
                 full path</title>
                 <para>Don't use exec(), popen(), etc. to execute external
-                commands without explicity using the full path of the external
+                commands without explicitly using the full path of the external
                 program.</para>
 
                 <para>Doing otherwise makes the plugin vulnerable to hijacking
@@ -436,7 +436,7 @@
                 </section>
 
 </section>
-        
+
 
 
 
@@ -447,17 +447,17 @@
                 Perl Nagios (ePN) requires stricter use of the some of Perl's features.
                 This section outlines some of the steps needed to use ePN
                 effectively.</para>
-          
+
                 <orderedlist>
-                        
-                        <listitem><para> Do not use BEGIN and END blocks since they will be called 
-                        only once (when Nagios starts and shuts down) with Embedded Perl (ePN).  In 
+
+                        <listitem><para> Do not use BEGIN and END blocks since they will be called
+                        only once (when Nagios starts and shuts down) with Embedded Perl (ePN).  In
                         particular, do not use BEGIN blocks to initialize variables.</para>
                         </listitem>
-          
+
                         <listitem><para>To use utils.pm, you need to provide a full path to the
                         module in order for it to work.</para>
-                        
+
           <literallayout>
           e.g.
                 use lib "/usr/local/nagios/libexec";
@@ -467,24 +467,24 @@
 
                         <listitem><para>Perl scripts should be called with "-w"</para>
                         </listitem>
-                        
+
                         <listitem><para>All Perl plugins must compile cleanly under "use strict" - i.e. at
                         least explicitly package names as in "$main::x" or predeclare every
                         variable. </para>
-                        
+
 
                         <para>Explicitly initialize each variable in use.  Otherwise with
                         caching enabled, the plugin will not be recompiled each time, and
                         therefore Perl will not reinitialize all the variables.  All old
                         variable values will still be in effect.</para>
                         </listitem>
-                        
+
                         <listitem><para>Do not use &gt;DATA&lt; handles (these simply do not compile under ePN).</para>
                         </listitem>
 
                         <listitem><para>Do not use global variables in named subroutines. This is bad practise anyway, but with ePN the
                         compiler will report an error "&lt;global_var&gt; will not stay shared ..". Values used by
-                        subroutines should be passed in the argument list.</para> 
+                        subroutines should be passed in the argument list.</para>
                         </listitem>
 
                         <listitem><para>If writing to a file (perhaps recording
@@ -492,8 +492,8 @@
                         calls <emphasis role="strong">exit</emphasis>; that is caught by
                         p1.pl, so output streams are never closed.</para>
                         </listitem>
-                
-                        <listitem><para>As in <xref linkend="runtime"> all plugins need 
+
+                        <listitem><para>As in <xref linkend="runtime"> all plugins need
                         to monitor their runtime, specially if they are using network
                         resources.  Use of the <emphasis>alarm</emphasis> is recommended
                         noting that some Perl modules (eg LWP) manage timers, so that an alarm
@@ -507,9 +507,9 @@
                         and then "exit $ERRORS{'OK'}" rather than "exit 0"
                         </para>
                         </listitem>
-                        
+
                 </orderedlist>
-          
+
 </section>
 
 <section id="runtime"><title>Runtime Timeouts</title>
@@ -524,14 +524,14 @@
                 df could lock up like that.  Plus, it should just be more error
                 resistant to be able to time out rather than consume
                 resources.</para>
-                
+
                 <section><title>Use DEFAULT_SOCKET_TIMEOUT</title>
 
                 <para>All network plugins should use DEFAULT_SOCKET_TIMEOUT to timeout</para>
 
                 </section>
 
-                
+
                 <section><title>Add alarms to network plugins</title>
 
                 <para>If you write a plugin which communicates with another
@@ -543,16 +543,16 @@
 
                 </section>
 
-                
+
 
 </section>
 
 <section id="PlugOptions"><title>Plugin Options</title>
-        
-                <para>A well written plugin should have --help as a way to get 
+
+                <para>A well written plugin should have --help as a way to get
                 verbose help. Code and output should try to respect the 80x25 size of a
                 crt (remember when fixing stuff in the server room!)</para>
-                
+
                 <section><title>Option Processing</title>
 
                 <para>For plugins written in C, we recommend the C standard
@@ -585,11 +585,11 @@
           -p port or password (--port or --passwd/--password)monitors operational
           -u url or username (--url or --username)
                 </literallayout>
-          
+
                 <para>Look at check_pgsql and check_procs to see how I currently
                 think this can work.  Standard options are:</para>
 
-          
+
                 <para>The option -V or --version should be present in all
                 plugins. For C plugins it should result in a call to print_revision, a
                 function in utils.c which takes two character arguments, the
@@ -603,7 +603,7 @@
 
                 <para>The option -h or --help should be present in all plugins.
                 In C plugins, it should result in a call to print_help (or
-                equivalent).  The function print_help should call print_revision, 
+                equivalent).  The function print_help should call print_revision,
                 then print_usage, then should provide detailed
                 help. Help text should fit on an 80-character width display, but
                 may run as many lines as needed.</para>
@@ -655,7 +655,7 @@
           <para>If possible when writing lists, use tokens to make the
           list easy to remember and non-order dependent - so
           check_disk uses '-c 10000,10%' so that it is clear which is
-          the precentage and which is the KB values (note that due to
+          the percentage and which is the KB values (note that due to
           my own lack of foresight, that used to be '-c 10000:10%' but
           such constructs should all be changed for consistency,
           though providing reverse compatibility is fairly
@@ -666,7 +666,7 @@
 
       <para>As always, comments are welcome - making this consistent
       without a host of long options was quite a hassle, and I would
-      suspect that there are flaws in this strategy. 
+      suspect that there are flaws in this strategy.
       </para>
     </section>
 </section>
@@ -678,7 +678,7 @@ create and update test cases where possible.
 </para>
 
 <para>
-To run a test, from the top level directory, run "make test". This will run 
+To run a test, from the top level directory, run "make test". This will run
 all the current tests and report an overall success rate.
 </para>
 
@@ -686,7 +686,7 @@ all the current tests and report an overall success rate.
 <para>These use perl's Test::More. To do a one time test, run "cd plugins && perl t/check_disk.t".
 </para>
 
-<para>There will somtimes be failures seen in this output which are known failures that
+<para>There will sometimes be failures seen in this output which are known failures that
 need to be fixed. As long as the return code is 0, it will be reported as "test pass".
 (If you have a fix so that the specific test passes, that will be gratefully received!)
 </para>
@@ -697,7 +697,7 @@ This runs the test in a summary format.
 </para>
 
 <para>
-For a good and amusing tutorial on using Test::More, see this 
+For a good and amusing tutorial on using Test::More, see this
 <ulink url="http://search.cpan.org/dist/Test-Simple/lib/Test/Tutorial.pod">
 link</ulink>
 </para>
@@ -706,16 +706,16 @@ link</ulink>
 
 <section><title>Testing the C library functions</title>
 <para>
-We use <ulink url="http://jc.ngo.org.uk/trac-bin/trac.cgi/wiki/LibTap">the libtap library</ulink>, which gives 
+We use <ulink url="http://jc.ngo.org.uk/trac-bin/trac.cgi/wiki/LibTap">the libtap library</ulink>, which gives
 perl's TAP
 (Test Anything Protocol) output. This is used by the FreeBSD team for their regression testing.
 </para>
 
 <para>
-To run tests using the libtap library, download the latest tar ball and extract. 
-There is a problem with tap-1.01 where 
+To run tests using the libtap library, download the latest tar ball and extract.
+There is a problem with tap-1.01 where
 <ulink url="http://jc.ngo.org.uk/trac-bin/trac.cgi/ticket/25">pthread support doesn't appear to work</ulink>
-properly on non-FreeBSD systems. Install with 'CPPFLAGS="-UHAVE_LIBPTHREAD" ./configure && make && make check && make install'. 
+properly on non-FreeBSD systems. Install with 'CPPFLAGS="-UHAVE_LIBPTHREAD" ./configure && make && make check && make install'.
 </para>
 
 <para>
@@ -729,24 +729,21 @@ setup the tests. Run "make test" to run all the tests.
         <para>See <ulink url="http://www.gnu.org/prep/standards_toc.html">GNU
         Coding standards</ulink> for general guidelines.</para>
         <section><title>C coding</title>
-        
-        <para>Variables should be declared at the beginning of code blocks and 
-        not inline because of portability with older compilers.</para>
 
-        <para>You should use /* */ for comments and not // as some compilers
-        do not handle the latter form.</para>
+        <para>Variables should be declared at the beginning of code blocks and
+        not inline because of portability with older compilers.</para>
 
-        <para>You should also avoid using the type "bool" and its values
-        "true" and "false". Instead use the "int" type and the plugins' own
-        "TRUE"/"FALSE" values to keep the code uniformly.</para>
+        <para>You should use the type "bool" and its values
+        "true" and "false" instead of the "int" type for booleans.
+        </para>
         </section>
 
         <section><title>Crediting sources</title>
         <para>If you have copied a routine from another source, make sure the licence
         from your source allows this. Add a comment referencing the ACKNOWLEDGEMENTS
         file, where you can put more detail about the source.</para>
-        <para>For contributed code, do not add any named credits in the source code 
-        - contributors should be added into the THANKS.in file instead. 
+        <para>For contributed code, do not add any named credits in the source code
+        - contributors should be added into the THANKS.in file instead.
         </para>
         </section>
 
@@ -809,11 +806,11 @@ setup the tests. Run "make test" to run all the tests.
 
 
         <section id="Contributedplugins"><title>Contributed plugins</title>
-        <para>Plugins that have been contributed to the project and 
+        <para>Plugins that have been contributed to the project and
         distributed with the Monitoring Plugins files are held in the contrib/ directory and are not installed
-        by default. These plugins are not officially supported by the team. 
-        The current policy is that these plugins should be owned and maintained by the original 
-        contributor, preferably hosted on <ulink url="http://monitoringexchange.org">Monitoring Exchange</ulink>.
+        by default. These plugins are not officially supported by the team.
+        The current policy is that these plugins should be owned and maintained by the original
+        contributor, preferably hosted on <ulink url="https://exchange.icinga.com/">Icinga Exchange</ulink>.
         </para>
         <para>If patches or bugs are raised to an contributed plugin, we will start communications with the
         original contributor, but seek to remove the plugin from our distribution.
@@ -824,11 +821,11 @@ setup the tests. Run "make test" to run all the tests.
 
         <section id="Newplugins"><title>New plugins</title>
         <para>If you would like others to use your plugins, please add it to
-        the official 3rd party plugin repository, 
-        <ulink url="http://monitoringexchange.org">Monitoring Exchange</ulink>.
+        the official 3rd party plugin repository,
+        <ulink url="https://exchange.icinga.com/">Icinga Exchange</ulink>.
         </para>
 
-        <para>We are not accepting requests for inclusion of plugins into 
+        <para>We are not accepting requests for inclusion of plugins into
         our distribution at the moment, but when we do, these are the minimum
         requirements:
         </para>
@@ -843,10 +840,10 @@ setup the tests. Run "make test" to run all the tests.
           --timeout, --warning, --critical)</para>
         </listitem>
         <listitem>
-          <para>It is determined to be not redundant (for instance, we would not 
-                add a new version of check_disk just because someone had provide 
-                a plugin that had perf checking - we would incorporate the features 
-                into an exisiting plugin)</para>
+          <para>It is determined to be not redundant (for instance, we would not
+                add a new version of check_disk just because someone had provide
+                a plugin that had perf checking - we would incorporate the features
+                into an existing plugin)</para>
         </listitem>
         <listitem>
           <para>One of the developers has had the time to audit the code and declare
@@ -857,7 +854,7 @@ setup the tests. Run "make test" to run all the tests.
 utils (perl or c or sh) rather than using its own</para>
         </listitem>
         <listitem>
-          <para>Includes patches to configure.in if required (via the EXTRAS list if 
+          <para>Includes patches to configure.in if required (via the EXTRAS list if
           it will only work on some platforms)</para>
         </listitem>
         <listitem>
@@ -870,5 +867,5 @@ utils (perl or c or sh) rather than using its own</para>
 
 </section>
 </article>
-  
+
 </book>