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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-06 02:25:50 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-06 02:25:50 +0000 |
commit | 19f4f86bfed21c5326ed2acebe1163f3a83e832b (patch) | |
tree | d59b9989ce55ed23693e80974d94c856f1c2c8b1 /man/sd-daemon.xml | |
parent | Initial commit. (diff) | |
download | systemd-upstream.tar.xz systemd-upstream.zip |
Adding upstream version 241.upstream/241upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'man/sd-daemon.xml')
-rw-r--r-- | man/sd-daemon.xml | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/man/sd-daemon.xml b/man/sd-daemon.xml new file mode 100644 index 0000000..a404213 --- /dev/null +++ b/man/sd-daemon.xml @@ -0,0 +1,120 @@ +<?xml version='1.0'?> <!--*-nxml-*--> +<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" + "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"> + +<!-- + SPDX-License-Identifier: LGPL-2.1+ +--> + +<refentry id="sd-daemon" + xmlns:xi="http://www.w3.org/2001/XInclude"> + + <refentryinfo> + <title>sd-daemon</title> + <productname>systemd</productname> + </refentryinfo> + + <refmeta> + <refentrytitle>sd-daemon</refentrytitle> + <manvolnum>3</manvolnum> + </refmeta> + + <refnamediv> + <refname>sd-daemon</refname> + <refname>SD_EMERG</refname> + <refname>SD_ALERT</refname> + <refname>SD_CRIT</refname> + <refname>SD_ERR</refname> + <refname>SD_WARNING</refname> + <refname>SD_NOTICE</refname> + <refname>SD_INFO</refname> + <refname>SD_DEBUG</refname> + <refpurpose>APIs for + new-style daemons</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcsynopsisinfo>#include <systemd/sd-daemon.h></funcsynopsisinfo> + </funcsynopsis> + + <cmdsynopsis> + <command>pkg-config --cflags --libs libsystemd</command> + </cmdsynopsis> + + </refsynopsisdiv> + + <refsect1> + <title>Description</title> + + <para><filename>sd-daemon.h</filename> provides APIs for new-style + daemons, as implemented by the + <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry> + service manager.</para> + + <para>See + <citerefentry><refentrytitle>sd_listen_fds</refentrytitle><manvolnum>3</manvolnum></citerefentry>, + <citerefentry><refentrytitle>sd_notify</refentrytitle><manvolnum>3</manvolnum></citerefentry>, + <citerefentry><refentrytitle>sd_booted</refentrytitle><manvolnum>3</manvolnum></citerefentry>, + <citerefentry><refentrytitle>sd_is_fifo</refentrytitle><manvolnum>3</manvolnum></citerefentry>, + <citerefentry><refentrytitle>sd_watchdog_enabled</refentrytitle><manvolnum>3</manvolnum></citerefentry> + for more information about the functions implemented. In addition + to these functions, a couple of logging prefixes are defined as + macros:</para> + + <programlisting>#define SD_EMERG "<0>" /* system is unusable */ +#define SD_ALERT "<1>" /* action must be taken immediately */ +#define SD_CRIT "<2>" /* critical conditions */ +#define SD_ERR "<3>" /* error conditions */ +#define SD_WARNING "<4>" /* warning conditions */ +#define SD_NOTICE "<5>" /* normal but significant condition */ +#define SD_INFO "<6>" /* informational */ +#define SD_DEBUG "<7>" /* debug-level messages */</programlisting> + + <para>These prefixes are intended to be used in conjunction with + stderr-based logging as implemented by systemd. If a systemd + service definition file is configured with + <varname>StandardError=journal</varname>, + <varname>StandardError=syslog</varname> or + <varname>StandardError=kmsg</varname>, these prefixes can be used + to encode a log level in lines printed. This is similar to the + kernel <function>printk()</function>-style logging. See + <citerefentry><refentrytitle>klogctl</refentrytitle><manvolnum>2</manvolnum></citerefentry> + for more information.</para> + + <para>The log levels are identical to + <citerefentry project='man-pages'><refentrytitle>syslog</refentrytitle><manvolnum>3</manvolnum></citerefentry>'s + log level system. To use these prefixes simply prefix every line + with one of these strings. A line that is not prefixed will be + logged at the default log level SD_INFO.</para> + + <example> + <title>Hello World</title> + + <para>A daemon may log with the log level NOTICE by issuing this + call:</para> + + <programlisting>fprintf(stderr, SD_NOTICE "Hello World!\n");</programlisting> + </example> + </refsect1> + + <xi:include href="libsystemd-pkgconfig.xml" /> + + <refsect1> + <title>See Also</title> + <para> + <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>, + <citerefentry><refentrytitle>sd_listen_fds</refentrytitle><manvolnum>3</manvolnum></citerefentry>, + <citerefentry><refentrytitle>sd_notify</refentrytitle><manvolnum>3</manvolnum></citerefentry>, + <citerefentry><refentrytitle>sd_booted</refentrytitle><manvolnum>3</manvolnum></citerefentry>, + <citerefentry><refentrytitle>sd_is_fifo</refentrytitle><manvolnum>3</manvolnum></citerefentry>, + <citerefentry><refentrytitle>sd_watchdog_enabled</refentrytitle><manvolnum>3</manvolnum></citerefentry>, + <citerefentry><refentrytitle>daemon</refentrytitle><manvolnum>7</manvolnum></citerefentry>, + <citerefentry><refentrytitle>systemd.service</refentrytitle><manvolnum>5</manvolnum></citerefentry>, + <citerefentry><refentrytitle>systemd.socket</refentrytitle><manvolnum>5</manvolnum></citerefentry>, + <citerefentry project='man-pages'><refentrytitle>fprintf</refentrytitle><manvolnum>3</manvolnum></citerefentry>, + <citerefentry project='die-net'><refentrytitle>pkg-config</refentrytitle><manvolnum>1</manvolnum></citerefentry> + </para> + </refsect1> + +</refentry> |