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| <section id="logging-to-a-ram-buffer"> |
| <h1>Logging to a RAM Buffer<a class="headerlink" href="#logging-to-a-ram-buffer" title="Permalink to this heading"></a></h1> |
| <div class="admonition warning"> |
| <p class="admonition-title">Warning</p> |
| <p>Migrated from: |
| <a class="reference external" href="https://cwiki.apache.org/confluence/display/NUTTX/Logging+to+a+RAM+Buffer">https://cwiki.apache.org/confluence/display/NUTTX/Logging+to+a+RAM+Buffer</a></p> |
| </div> |
| <section id="default-debug-output"> |
| <h2>Default Debug Output<a class="headerlink" href="#default-debug-output" title="Permalink to this heading"></a></h2> |
| <p>By default, when you enable debug output, that output goes to the system |
| console and is mixed up with the normal console output. Normally, that is |
| sufficient. However there are some cases where you might want to do things |
| differently. For example, if there is time critical debug output that |
| interferes with the operation of the device. Or, if you would like to |
| separate the normal console output from the debug output.</p> |
| <p>One particularly troublesome case is network debug output to console in a |
| Telnet session. Since the telnet session remaps the console output to the |
| Telnet connection, the network debug output can generate infinite loops |
| because the network operation generates debug output to the console, which |
| generates more debug output, … and on and on.</p> |
| <p>With some creative configuration of the NuttX SYStem LOGging (SYSLOG) feature, |
| these problems can all be eliminated.</p> |
| </section> |
| <section id="the-syslog-device"> |
| <h2>The syslog Device<a class="headerlink" href="#the-syslog-device" title="Permalink to this heading"></a></h2> |
| <p>Debug output goes to the <cite>syslog</cite> device. As mentioned above, the default syslog |
| device device is the system console. However there are many options to control |
| the behavior of the syslog – too many in fact. There are so many options that |
| you will probably have to perform experiments to get the syslog working as you |
| would like it too.</p> |
| </section> |
| <section id="the-ramlog-device"> |
| <h2>The RAMLOG Device<a class="headerlink" href="#the-ramlog-device" title="Permalink to this heading"></a></h2> |
| <p>The RAMLOG device is a special character device that can really be used for |
| most any purpose. However, the RAMLOG device has some special attributes |
| that make it ideal for use as a syslogging device.</p> |
| <ul class="simple"> |
| <li><p>It supports the <code class="docutils literal notranslate"><span class="pre">syslog_write</span></code> interface needed for system logging</p></li> |
| <li><p>It behaves much like a pipe: It implements a queue. Writing to the RAMLOG |
| device adds data to the head of the queue; reading from the RAMLOG device |
| removes data from the tail of the queue.</p></li> |
| <li><p>It can be configured to return EOF when you try to read and there is |
| nothing available in the RAMLOG.</p></li> |
| </ul> |
| </section> |
| <section id="using-the-ramlog-as-the-syslog-device"> |
| <h2>Using the RAMLOG as the syslog Device<a class="headerlink" href="#using-the-ramlog-as-the-syslog-device" title="Permalink to this heading"></a></h2> |
| <p>This Wiki page addresses the setup for one configuration: Using a <cite>RAMLOG</cite> as |
| the syslog device. A RAMLOG is a circular buffer in memory. In this |
| configuration, all debugout output goes to this circular buffer and can later |
| be retrieved using the NSH <code class="docutils literal notranslate"><span class="pre">dmesg</span></code> command</p> |
| <p>Here is the summary of what I had to do to get the RAMLOG working as the |
| syslog device. I use a simulation configuration, but for this feature this |
| does not matter.</p> |
| <div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>tools/configure.sh<span class="w"> </span>sim:nsh |
| make<span class="w"> </span>menuconfig |
| </pre></div> |
| </div> |
| <p>I added the following settings. First, these just give me some debug output |
| to test against:</p> |
| <div class="highlight-c notranslate"><div class="highlight"><pre><span></span><span class="n">CONFIG_DEBUG</span><span class="o">=</span><span class="n">y</span> |
| <span class="n">CONFIG_DEBUG_FS</span><span class="o">=</span><span class="n">y</span> |
| <span class="n">CONFIG_DEBUG_SCHED</span><span class="o">=</span><span class="n">y</span> |
| </pre></div> |
| </div> |
| <p>This configures the virtual file system to support the syslog device and is a |
| necessary pre-condition for other settings:</p> |
| <div class="highlight-c notranslate"><div class="highlight"><pre><span></span><span class="n">CONFIG_SYSLOG</span><span class="o">=</span><span class="n">y</span> |
| </pre></div> |
| </div> |
| <p>These enables the RAMLOG and configure it for use as the syslog device</p> |
| <div class="highlight-c notranslate"><div class="highlight"><pre><span></span><span class="n">CONFIG_RAMLOG</span><span class="o">=</span><span class="n">y</span> |
| <span class="n">CONFIG_RAMLOG_CONSOLE_BUFSIZE</span><span class="o">=</span><span class="mi">8192</span> |
| <span class="n">CONFIG_RAMLOG_NONBLOCKING</span><span class="o">=</span><span class="n">y</span> |
| <span class="n">CONFIG_RAMLOG_SYSLOG</span><span class="o">=</span><span class="n">y</span> |
| <span class="cp">#CONFIG_SYSLOG_CHAR undefined, else duplicate output with syslog_write()</span> |
| </pre></div> |
| </div> |
| <p>Now when I run NuttX, I get output like this. The <code class="docutils literal notranslate"><span class="pre">dmesg</span></code> command now appears |
| as an NSH command:</p> |
| <div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>NuttShell<span class="w"> </span><span class="o">(</span>NSH<span class="o">)</span><span class="w"> </span>NuttX-7.1 |
| nsh><span class="w"> </span><span class="nb">help</span> |
| <span class="nb">help</span><span class="w"> </span>usage:<span class="w"> </span><span class="nb">help</span><span class="w"> </span><span class="o">[</span>-v<span class="o">]</span><span class="w"> </span><span class="o">[</span><cmd><span class="o">]</span> |
| <span class="o">[</span><span class="w"> </span>dd<span class="w"> </span>free<span class="w"> </span>mkdir<span class="w"> </span>mw<span class="w"> </span>sleep |
| ?<span class="w"> </span>df<span class="w"> </span><span class="nb">help</span><span class="w"> </span>mkfatfs<span class="w"> </span>ps<span class="w"> </span><span class="nb">test</span> |
| <span class="k">break</span><span class="w"> </span>dmesg<span class="w"> </span>hexdump<span class="w"> </span>mkfifo<span class="w"> </span><span class="nb">pwd</span><span class="w"> </span><span class="nb">true</span> |
| cat<span class="w"> </span><span class="nb">echo</span><span class="w"> </span><span class="nb">kill</span><span class="w"> </span>mkrd<span class="w"> </span>rm<span class="w"> </span>umount |
| <span class="nb">cd</span><span class="w"> </span><span class="nb">exec</span><span class="w"> </span>losetup<span class="w"> </span>mh<span class="w"> </span>rmdir<span class="w"> </span><span class="nb">unset</span> |
| cp<span class="w"> </span><span class="nb">exit</span><span class="w"> </span>ls<span class="w"> </span>mount<span class="w"> </span><span class="nb">set</span><span class="w"> </span>usleep |
| cmp<span class="w"> </span><span class="nb">false</span><span class="w"> </span>mb<span class="w"> </span>mv<span class="w"> </span>sh<span class="w"> </span>xd |
| Builtin<span class="w"> </span>Apps: |
| hello |
| </pre></div> |
| </div> |
| <p>The <code class="docutils literal notranslate"><span class="pre">dmesg</span></code> command dumps the contents and clears the RAMLOG:</p> |
| <div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>nsh><span class="w"> </span>dmesg |
| nx_start:<span class="w"> </span>Entry |
| up_unblock_task:<span class="w"> </span>Unblocking<span class="w"> </span><span class="nv">TCB</span><span class="o">=</span>52bc70 |
| up_unblock_task:<span class="w"> </span>New<span class="w"> </span>Active<span class="w"> </span>Task<span class="w"> </span><span class="nv">TCB</span><span class="o">=</span>52bc70 |
| posix_spawn_exec:<span class="w"> </span>ERROR:<span class="w"> </span><span class="nb">exec</span><span class="w"> </span>failed:<span class="w"> </span><span class="m">22</span> |
| cmd_mkrd:<span class="w"> </span>RAMDISK<span class="w"> </span>at<span class="w"> </span>52d4f0 |
| posix_spawn_exec:<span class="w"> </span>ERROR:<span class="w"> </span><span class="nb">exec</span><span class="w"> </span>failed:<span class="w"> </span><span class="m">22</span> |
| mkfatfs_tryfat16:<span class="w"> </span>Too<span class="w"> </span>few<span class="w"> </span>or<span class="w"> </span>too<span class="w"> </span>many<span class="w"> </span>clusters<span class="w"> </span><span class="k">for</span><span class="w"> </span>FAT16:<span class="w"> </span><span class="m">4081</span><span class="w"> </span><<span class="w"> </span><span class="m">983</span><span class="w"> </span><<span class="w"> </span><span class="m">1022</span> |
| mkfatfs_clustersearch:<span class="w"> </span>Cannot<span class="w"> </span>format<span class="w"> </span>FAT16<span class="w"> </span>at<span class="w"> </span><span class="m">1</span><span class="w"> </span>sectors/cluster |
| mkfatfs_configfatfs:<span class="w"> </span>Sector<span class="w"> </span>size:<span class="w"> </span><span class="m">512</span><span class="w"> </span>bytes |
| mkfatfs_configfatfs:<span class="w"> </span>Number<span class="w"> </span>of<span class="w"> </span>sectors:<span class="w"> </span><span class="m">1024</span><span class="w"> </span>sectors |
| mkfatfs_configfatfs:<span class="w"> </span>FAT<span class="w"> </span>size:<span class="w"> </span><span class="m">12</span><span class="w"> </span>bits |
| mkfatfs_configfatfs:<span class="w"> </span>Number<span class="w"> </span>FATs:<span class="w"> </span><span class="m">2</span> |
| mkfatfs_configfatfs:<span class="w"> </span>Sectors<span class="w"> </span>per<span class="w"> </span>cluster:<span class="w"> </span><span class="m">1</span><span class="w"> </span>sectors |
| mkfatfs_configfatfs:<span class="w"> </span>FS<span class="w"> </span>size:<span class="w"> </span><span class="m">3</span><span class="w"> </span>sectors |
| mkfatfs_configfatfs:<span class="w"> </span><span class="m">985</span><span class="w"> </span>clusters |
| mkfatfs_configfatfs:<span class="w"> </span>Root<span class="w"> </span>directory<span class="w"> </span>slots:<span class="w"> </span><span class="m">512</span> |
| mkfatfs_configfatfs:<span class="w"> </span>Volume<span class="w"> </span>ID:<span class="w"> </span><span class="m">00000000</span> |
| mkfatfs_configfatfs:<span class="w"> </span>Volume<span class="w"> </span>Label:<span class="w"> </span><span class="s2">" "</span> |
| posix_spawn_exec:<span class="w"> </span>ERROR:<span class="w"> </span><span class="nb">exec</span><span class="w"> </span>failed:<span class="w"> </span><span class="m">22</span> |
| fat_mount:<span class="w"> </span>FAT12: |
| fat_mount:<span class="w"> </span>HW<span class="w"> </span>sector<span class="w"> </span>size:<span class="w"> </span><span class="m">512</span> |
| fat_mount:<span class="w"> </span>sectors:<span class="w"> </span><span class="m">1024</span> |
| fat_mount:<span class="w"> </span>FAT<span class="w"> </span>reserved:<span class="w"> </span><span class="m">1</span> |
| fat_mount:<span class="w"> </span>sectors:<span class="w"> </span><span class="m">1024</span> |
| fat_mount:<span class="w"> </span>start<span class="w"> </span>sector:<span class="w"> </span><span class="m">1</span> |
| fat_mount:<span class="w"> </span>root<span class="w"> </span>sector:<span class="w"> </span><span class="m">7</span> |
| fat_mount:<span class="w"> </span>root<span class="w"> </span>entries:<span class="w"> </span><span class="m">512</span> |
| fat_mount:<span class="w"> </span>data<span class="w"> </span>sector:<span class="w"> </span><span class="m">39</span> |
| fat_mount:<span class="w"> </span>FSINFO<span class="w"> </span>sector:<span class="w"> </span><span class="m">0</span> |
| fat_mount:<span class="w"> </span>Num<span class="w"> </span>FATs:<span class="w"> </span><span class="m">2</span> |
| fat_mount:<span class="w"> </span>FAT<span class="w"> </span>sectors:<span class="w"> </span><span class="m">3</span> |
| fat_mount:<span class="w"> </span>sectors/cluster:<span class="w"> </span><span class="m">1</span> |
| fat_mount:<span class="w"> </span>max<span class="w"> </span>clusters:<span class="w"> </span><span class="m">985</span> |
| fat_mount:<span class="w"> </span>FSI<span class="w"> </span>free<span class="w"> </span>count<span class="w"> </span>-1 |
| fat_mount:<span class="w"> </span>next<span class="w"> </span>free<span class="w"> </span><span class="m">0</span> |
| posix_spawn_exec:<span class="w"> </span>ERROR:<span class="w"> </span><span class="nb">exec</span><span class="w"> </span>failed:<span class="w"> </span><span class="m">22</span> |
| posix_spawn_exec:<span class="w"> </span>ERROR:<span class="w"> </span><span class="nb">exec</span><span class="w"> </span>failed:<span class="w"> </span><span class="m">22</span> |
| nsh> |
| </pre></div> |
| </div> |
| <p>As mentioned, the dmesg command clears the RAMLOG. So when it is used again, |
| only new debug output is shown:</p> |
| <div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>nsh><span class="w"> </span>dmesg |
| posix_spawn_exec:<span class="w"> </span>ERROR:<span class="w"> </span><span class="nb">exec</span><span class="w"> </span>failed:<span class="w"> </span><span class="m">22</span> |
| </pre></div> |
| </div> |
| <p>As a side note, the <code class="docutils literal notranslate"><span class="pre">posix_spawn_exec</span></code> error will occur on each command in |
| this configuration. That is because NSH first tries to execute a command from |
| a file found in the file system on the <code class="docutils literal notranslate"><span class="pre">PATH</span></code> variable. You will not see |
| this error in your system unless you have <code class="docutils literal notranslate"><span class="pre">CONFIG_NSH_FILE_APPS=y</span></code> |
| defined in your configuration.</p> |
| </section> |
| </section> |
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