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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 218</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="idm140559535292016"></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 | |
| 60f067b4 | 24 | for new-style daemons, as implemented by the |
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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>, | |
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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> | |
| 663996b3 | 32 | for more information about the functions |
| 60f067b4 | 33 | implemented. In addition to these functions, a couple |
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34 | of logging prefixes are defined as macros:</p><pre class="programlisting">#define SD_EMERG "<0>" /* system is unusable */ |
| 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 */ | |
| 41 | #define SD_DEBUG "<7>" /* debug-level messages */</pre><p>These prefixes are intended to be used in | |
| 60f067b4 | 42 | conjunction with stderr-based logging as implemented |
| 663996b3 | 43 | by systemd. If a systemd service definition file is |
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44 | configured with |
| 45 | <code class="varname">StandardError=journal</code>, | |
| 46 | <code class="varname">StandardError=syslog</code> or | |
| 47 | <code class="varname">StandardError=kmsg</code>, these prefixes | |
| 48 | can be used to encode a log level in lines | |
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49 | printed. This is similar to the kernel |
| 50 | <code class="function">printk()</code>-style logging. See | |
| 5eef597e | 51 | <a href="http://man7.org/linux/man-pages/man2/klogctl.2.html"><span class="citerefentry"><span class="refentrytitle">klogctl</span>(2)</span></a> |
| 663996b3 | 52 | for more information.</p><p>The log levels are identical to |
| 5eef597e | 53 | <a href="http://man7.org/linux/man-pages/man3/syslog.3.html"><span class="citerefentry"><span class="refentrytitle">syslog</span>(3)</span></a>'s |
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54 | log level system. To use these prefixes simply prefix |
| 55 | every line with one of these strings. A line that is | |
| 56 | not prefixed will be logged at the default log level | |
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57 | SD_INFO.</p><div class="example"><a name="idm140559536520816"></a><p class="title"><b>Example 1. Hello World</b></p><div class="example-contents"><p>A daemon may log with the log level |
| 58 | NOTICE by issuing this 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="idm140559530637408"></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 | 59 | library, which can be compiled and linked to with the |
| 5eef597e | 60 | <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> |
| f47781d8 | 61 | file.</p></div><div class="refsect1"><a name="idm140559535185056"></a><h2 id="See Also">See Also<a class="headerlink" title="Permalink to this headline" href="#See%20Also">¶</a></h2><p> |
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62 | <a href="systemd.html"><span class="citerefentry"><span class="refentrytitle">systemd</span>(1)</span></a>, |
| 63 | <a href="sd_listen_fds.html"><span class="citerefentry"><span class="refentrytitle">sd_listen_fds</span>(3)</span></a>, | |
| 64 | <a href="sd_notify.html"><span class="citerefentry"><span class="refentrytitle">sd_notify</span>(3)</span></a>, | |
| 65 | <a href="sd_booted.html"><span class="citerefentry"><span class="refentrytitle">sd_booted</span>(3)</span></a>, | |
| 66 | <a href="sd_is_fifo.html"><span class="citerefentry"><span class="refentrytitle">sd_is_fifo</span>(3)</span></a>, | |
| 60f067b4 | 67 | <a href="sd_watchdog_enabled.html"><span class="citerefentry"><span class="refentrytitle">sd_watchdog_enabled</span>(3)</span></a>, |
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68 | <a href="daemon.html"><span class="citerefentry"><span class="refentrytitle">daemon</span>(7)</span></a>, |
| 69 | <a href="systemd.service.html"><span class="citerefentry"><span class="refentrytitle">systemd.service</span>(5)</span></a>, | |
| 70 | <a href="systemd.socket.html"><span class="citerefentry"><span class="refentrytitle">systemd.socket</span>(5)</span></a>, | |
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71 | <a href="http://man7.org/linux/man-pages/man3/fprintf.3.html"><span class="citerefentry"><span class="refentrytitle">fprintf</span>(3)</span></a>, |
| 72 | <a href="http://linux.die.net/man/1/pkg-config"><span class="citerefentry"><span class="refentrytitle">pkg-config</span>(1)</span></a> | |
| 663996b3 | 73 | </p></div></div></body></html> |