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1 | <html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>sd-daemon</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><style> |
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| 18 | </style><a href="index.html">Index </a>· | |
| 19 | <a href="systemd.directives.html">Directives </a>· | |
| 20 | <a href="../python-systemd/index.html">Python </a>· | |
| 21 | <a href="../libudev/index.html">libudev </a>· | |
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22 | <a href="../libudev/index.html">gudev </a><span style="float:right">systemd 219</span><hr><div class="refentry"><a name="sd-daemon"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>sd-daemon, SD_EMERG, SD_ALERT, SD_CRIT, SD_ERR, SD_WARNING, SD_NOTICE, SD_INFO, SD_DEBUG — APIs for |
| 23 | new-style daemons</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><div class="funcsynopsis"><pre class="funcsynopsisinfo">#include <systemd/sd-daemon.h></pre></div><div class="cmdsynopsis"><p><code class="command">pkg-config --cflags --libs libsystemd</code> </p></div></div><div class="refsect1"><a name="idm139723944054320"></a><h2 id="Description">Description<a class="headerlink" title="Permalink to this headline" href="#Description">¶</a></h2><p><code class="filename">sd-daemon.h</code> provide APIs for new-style | |
| 24 | daemons, as implemented by the | |
| 25 | <a href="systemd.html"><span class="citerefentry"><span class="refentrytitle">systemd</span>(1)</span></a> | |
| 26 | init system.</p><p>See | |
| 27 | <a href="sd_listen_fds.html"><span class="citerefentry"><span class="refentrytitle">sd_listen_fds</span>(3)</span></a>, | |
| 28 | <a href="sd_notify.html"><span class="citerefentry"><span class="refentrytitle">sd_notify</span>(3)</span></a>, | |
| 29 | <a href="sd_booted.html"><span class="citerefentry"><span class="refentrytitle">sd_booted</span>(3)</span></a>, | |
| 30 | <a href="sd_is_fifo.html"><span class="citerefentry"><span class="refentrytitle">sd_is_fifo</span>(3)</span></a>, | |
| 31 | <a href="sd_watchdog_enabled.html"><span class="citerefentry"><span class="refentrytitle">sd_watchdog_enabled</span>(3)</span></a> | |
| 32 | for more information about the functions implemented. In addition | |
| 33 | to these functions, a couple of logging prefixes are defined as | |
| 34 | macros:</p><pre class="programlisting">#define SD_EMERG "<0>" /* system is unusable */ | |
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35 | #define SD_ALERT "<1>" /* action must be taken immediately */ |
| 36 | #define SD_CRIT "<2>" /* critical conditions */ | |
| 37 | #define SD_ERR "<3>" /* error conditions */ | |
| 38 | #define SD_WARNING "<4>" /* warning conditions */ | |
| 39 | #define SD_NOTICE "<5>" /* normal but significant condition */ | |
| 40 | #define SD_INFO "<6>" /* informational */ | |
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41 | #define SD_DEBUG "<7>" /* debug-level messages */</pre><p>These prefixes are intended to be used in conjunction with |
| 42 | stderr-based logging as implemented by systemd. If a systemd | |
| 43 | service definition file is configured with | |
| 44 | <code class="varname">StandardError=journal</code>, | |
| 45 | <code class="varname">StandardError=syslog</code> or | |
| 46 | <code class="varname">StandardError=kmsg</code>, these prefixes can be used | |
| 47 | to encode a log level in lines printed. This is similar to the | |
| 48 | kernel <code class="function">printk()</code>-style logging. See | |
| 49 | <a href="http://man7.org/linux/man-pages/man2/klogctl.2.html"><span class="citerefentry"><span class="refentrytitle">klogctl</span>(2)</span></a> | |
| 50 | for more information.</p><p>The log levels are identical to | |
| 51 | <a href="http://man7.org/linux/man-pages/man3/syslog.3.html"><span class="citerefentry"><span class="refentrytitle">syslog</span>(3)</span></a>'s | |
| 52 | log level system. To use these prefixes simply prefix every line | |
| 53 | with one of these strings. A line that is not prefixed will be | |
| 54 | logged at the default log level SD_INFO.</p><div class="example"><a name="idm139723940257568"></a><p class="title"><b>Example 1. Hello World</b></p><div class="example-contents"><p>A daemon may log with the log level NOTICE by issuing this | |
| 55 | call:</p><pre class="programlisting">fprintf(stderr, SD_NOTICE "Hello World!\n");</pre></div></div><br class="example-break"></div><div class="refsect1"><a name="idm139723935707104"></a><h2 id="Notes">Notes<a class="headerlink" title="Permalink to this headline" href="#Notes">¶</a></h2><p><a name="pkgconfig-text"></a>These APIs are implemented as a shared | |
| 60f067b4 | 56 | library, which can be compiled and linked to with the |
| 5eef597e | 57 | <code class="constant">libsystemd</code> <a href="http://linux.die.net/man/1/pkg-config"><span class="citerefentry"><span class="refentrytitle">pkg-config</span>(1)</span></a> |
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58 | file.</p></div><div class="refsect1"><a name="idm139723940255008"></a><h2 id="See Also">See Also<a class="headerlink" title="Permalink to this headline" href="#See%20Also">¶</a></h2><p> |
| 59 | <a href="systemd.html"><span class="citerefentry"><span class="refentrytitle">systemd</span>(1)</span></a>, | |
| 60 | <a href="sd_listen_fds.html"><span class="citerefentry"><span class="refentrytitle">sd_listen_fds</span>(3)</span></a>, | |
| 61 | <a href="sd_notify.html"><span class="citerefentry"><span class="refentrytitle">sd_notify</span>(3)</span></a>, | |
| 62 | <a href="sd_booted.html"><span class="citerefentry"><span class="refentrytitle">sd_booted</span>(3)</span></a>, | |
| 63 | <a href="sd_is_fifo.html"><span class="citerefentry"><span class="refentrytitle">sd_is_fifo</span>(3)</span></a>, | |
| 64 | <a href="sd_watchdog_enabled.html"><span class="citerefentry"><span class="refentrytitle">sd_watchdog_enabled</span>(3)</span></a>, | |
| 65 | <a href="daemon.html"><span class="citerefentry"><span class="refentrytitle">daemon</span>(7)</span></a>, | |
| 66 | <a href="systemd.service.html"><span class="citerefentry"><span class="refentrytitle">systemd.service</span>(5)</span></a>, | |
| 67 | <a href="systemd.socket.html"><span class="citerefentry"><span class="refentrytitle">systemd.socket</span>(5)</span></a>, | |
| 68 | <a href="http://man7.org/linux/man-pages/man3/fprintf.3.html"><span class="citerefentry"><span class="refentrytitle">fprintf</span>(3)</span></a>, | |
| 69 | <a href="http://linux.die.net/man/1/pkg-config"><span class="citerefentry"><span class="refentrytitle">pkg-config</span>(1)</span></a> | |
| 70 | </p></div></div></body></html> |