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1 | <?xml version='1.0'?> <!--*-nxml-*--> |
2 | <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" | |
12b42c76 | 3 | "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"> |
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4 | |
5 | <!-- | |
572eb058 | 6 | SPDX-License-Identifier: LGPL-2.1+ |
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7 | --> |
8 | ||
6a70f3aa | 9 | <refentry id="sd-daemon" |
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10 | xmlns:xi="http://www.w3.org/2001/XInclude"> |
11 | ||
12 | <refentryinfo> | |
13 | <title>sd-daemon</title> | |
14 | <productname>systemd</productname> | |
15 | ||
16 | <authorgroup> | |
17 | <author> | |
18 | <contrib>Developer</contrib> | |
19 | <firstname>Lennart</firstname> | |
20 | <surname>Poettering</surname> | |
21 | <email>lennart@poettering.net</email> | |
22 | </author> | |
23 | </authorgroup> | |
24 | </refentryinfo> | |
25 | ||
26 | <refmeta> | |
27 | <refentrytitle>sd-daemon</refentrytitle> | |
28 | <manvolnum>3</manvolnum> | |
29 | </refmeta> | |
30 | ||
31 | <refnamediv> | |
32 | <refname>sd-daemon</refname> | |
33 | <refname>SD_EMERG</refname> | |
34 | <refname>SD_ALERT</refname> | |
35 | <refname>SD_CRIT</refname> | |
36 | <refname>SD_ERR</refname> | |
37 | <refname>SD_WARNING</refname> | |
38 | <refname>SD_NOTICE</refname> | |
39 | <refname>SD_INFO</refname> | |
40 | <refname>SD_DEBUG</refname> | |
41 | <refpurpose>APIs for | |
42 | new-style daemons</refpurpose> | |
43 | </refnamediv> | |
44 | ||
45 | <refsynopsisdiv> | |
46 | <funcsynopsis> | |
47 | <funcsynopsisinfo>#include <systemd/sd-daemon.h></funcsynopsisinfo> | |
48 | </funcsynopsis> | |
49 | ||
50 | <cmdsynopsis> | |
51 | <command>pkg-config --cflags --libs libsystemd</command> | |
52 | </cmdsynopsis> | |
53 | ||
54 | </refsynopsisdiv> | |
55 | ||
56 | <refsect1> | |
57 | <title>Description</title> | |
58 | ||
dc83f27a | 59 | <para><filename>sd-daemon.h</filename> provides APIs for new-style |
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60 | daemons, as implemented by the |
61 | <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry> | |
dc83f27a | 62 | service manager.</para> |
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63 | |
64 | <para>See | |
65 | <citerefentry><refentrytitle>sd_listen_fds</refentrytitle><manvolnum>3</manvolnum></citerefentry>, | |
66 | <citerefentry><refentrytitle>sd_notify</refentrytitle><manvolnum>3</manvolnum></citerefentry>, | |
67 | <citerefentry><refentrytitle>sd_booted</refentrytitle><manvolnum>3</manvolnum></citerefentry>, | |
68 | <citerefentry><refentrytitle>sd_is_fifo</refentrytitle><manvolnum>3</manvolnum></citerefentry>, | |
69 | <citerefentry><refentrytitle>sd_watchdog_enabled</refentrytitle><manvolnum>3</manvolnum></citerefentry> | |
70 | for more information about the functions implemented. In addition | |
71 | to these functions, a couple of logging prefixes are defined as | |
72 | macros:</para> | |
73 | ||
74 | <programlisting>#define SD_EMERG "<0>" /* system is unusable */ | |
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75 | #define SD_ALERT "<1>" /* action must be taken immediately */ |
76 | #define SD_CRIT "<2>" /* critical conditions */ | |
77 | #define SD_ERR "<3>" /* error conditions */ | |
78 | #define SD_WARNING "<4>" /* warning conditions */ | |
79 | #define SD_NOTICE "<5>" /* normal but significant condition */ | |
80 | #define SD_INFO "<6>" /* informational */ | |
81 | #define SD_DEBUG "<7>" /* debug-level messages */</programlisting> | |
82 | ||
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83 | <para>These prefixes are intended to be used in conjunction with |
84 | stderr-based logging as implemented by systemd. If a systemd | |
85 | service definition file is configured with | |
86 | <varname>StandardError=journal</varname>, | |
87 | <varname>StandardError=syslog</varname> or | |
88 | <varname>StandardError=kmsg</varname>, these prefixes can be used | |
89 | to encode a log level in lines printed. This is similar to the | |
90 | kernel <function>printk()</function>-style logging. See | |
91 | <citerefentry><refentrytitle>klogctl</refentrytitle><manvolnum>2</manvolnum></citerefentry> | |
92 | for more information.</para> | |
93 | ||
94 | <para>The log levels are identical to | |
95 | <citerefentry project='man-pages'><refentrytitle>syslog</refentrytitle><manvolnum>3</manvolnum></citerefentry>'s | |
96 | log level system. To use these prefixes simply prefix every line | |
97 | with one of these strings. A line that is not prefixed will be | |
98 | logged at the default log level SD_INFO.</para> | |
99 | ||
100 | <example> | |
101 | <title>Hello World</title> | |
102 | ||
103 | <para>A daemon may log with the log level NOTICE by issuing this | |
104 | call:</para> | |
105 | ||
106 | <programlisting>fprintf(stderr, SD_NOTICE "Hello World!\n");</programlisting> | |
107 | </example> | |
108 | </refsect1> | |
109 | ||
110 | <xi:include href="libsystemd-pkgconfig.xml" /> | |
111 | ||
112 | <refsect1> | |
113 | <title>See Also</title> | |
114 | <para> | |
115 | <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>, | |
116 | <citerefentry><refentrytitle>sd_listen_fds</refentrytitle><manvolnum>3</manvolnum></citerefentry>, | |
117 | <citerefentry><refentrytitle>sd_notify</refentrytitle><manvolnum>3</manvolnum></citerefentry>, | |
118 | <citerefentry><refentrytitle>sd_booted</refentrytitle><manvolnum>3</manvolnum></citerefentry>, | |
119 | <citerefentry><refentrytitle>sd_is_fifo</refentrytitle><manvolnum>3</manvolnum></citerefentry>, | |
120 | <citerefentry><refentrytitle>sd_watchdog_enabled</refentrytitle><manvolnum>3</manvolnum></citerefentry>, | |
121 | <citerefentry><refentrytitle>daemon</refentrytitle><manvolnum>7</manvolnum></citerefentry>, | |
122 | <citerefentry><refentrytitle>systemd.service</refentrytitle><manvolnum>5</manvolnum></citerefentry>, | |
123 | <citerefentry><refentrytitle>systemd.socket</refentrytitle><manvolnum>5</manvolnum></citerefentry>, | |
124 | <citerefentry project='man-pages'><refentrytitle>fprintf</refentrytitle><manvolnum>3</manvolnum></citerefentry>, | |
125 | <citerefentry project='die-net'><refentrytitle>pkg-config</refentrytitle><manvolnum>1</manvolnum></citerefentry> | |
126 | </para> | |
127 | </refsect1> | |
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128 | |
129 | </refentry> |