man: add sd_event_add_signal(3)
This commit is contained in:
Zbigniew Jędrzejewski-Szmek
parent
3a17521f59
commit
3144ebcad3
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@ -741,6 +741,7 @@ MANPAGES += \
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man/sd_bus_open_user.3 \
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man/sd_bus_path_encode.3 \
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man/sd_bus_request_name.3 \
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man/sd_event_add_signal.3 \
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man/sd_event_add_time.3 \
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man/sd_event_new.3 \
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man/systemd-bus-proxyd.8 \
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@ -802,6 +803,7 @@ MANPAGES_ALIAS += \
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man/sd_bus_unref.3 \
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man/sd_event_default.3 \
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man/sd_event_ref.3 \
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man/sd_event_source_get_signal.3 \
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man/sd_event_source_get_time.3 \
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man/sd_event_source_get_time_accuracy.3 \
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man/sd_event_source_get_time_clock.3 \
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@ -865,6 +867,7 @@ man/sd_bus_release_name.3: man/sd_bus_request_name.3
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man/sd_bus_unref.3: man/sd_bus_new.3
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man/sd_event_default.3: man/sd_event_new.3
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man/sd_event_ref.3: man/sd_event_new.3
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man/sd_event_source_get_signal.3: man/sd_event_add_signal.3
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man/sd_event_source_get_time.3: man/sd_event_add_time.3
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man/sd_event_source_get_time_accuracy.3: man/sd_event_add_time.3
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man/sd_event_source_get_time_clock.3: man/sd_event_add_time.3
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@ -1040,6 +1043,9 @@ man/sd_event_default.html: man/sd_event_new.html
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man/sd_event_ref.html: man/sd_event_new.html
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$(html-alias)
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man/sd_event_source_get_signal.html: man/sd_event_add_signal.html
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$(html-alias)
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man/sd_event_source_get_time.html: man/sd_event_add_time.html
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$(html-alias)
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@ -1542,6 +1548,7 @@ EXTRA_DIST += \
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man/sd_bus_open_user.xml \
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man/sd_bus_path_encode.xml \
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man/sd_bus_request_name.xml \
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man/sd_event_add_signal.xml \
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man/sd_event_add_time.xml \
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man/sd_event_new.xml \
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man/sd_get_seats.xml \
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@ -0,0 +1,196 @@
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<?xml version='1.0'?> <!--*-nxml-*-->
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
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"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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<!--
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This file is part of systemd.
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Copyright 2014 Zbigniew Jędrzejewski-Szmek
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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-->
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<refentry id="sd_event_add_signal" conditional="ENABLE_KDBUS">
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<refentryinfo>
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<title>sd_event_add_signal</title>
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<productname>systemd</productname>
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<authorgroup>
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<author>
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<contrib>More text</contrib>
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<firstname>Zbigniew</firstname>
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<surname>Jędrzejewski-Szmek</surname>
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<email>zbyszek@in.waw.pl</email>
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</author>
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</authorgroup>
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</refentryinfo>
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<refmeta>
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<refentrytitle>sd_event_add_signal</refentrytitle>
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<manvolnum>3</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>sd_event_add_signal</refname>
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<refname>sd_event_source_get_signal</refname>
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<refpurpose>Add a signal event source to an event loop</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<funcsynopsis>
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<funcsynopsisinfo>#include <systemd/sd-bus.h></funcsynopsisinfo>
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<funcprototype>
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<funcdef>int <function>sd_event_add_signal</function></funcdef>
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<paramdef>sd_event *<parameter>event</parameter></paramdef>
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<paramdef>sd_event_source **<parameter>source</parameter></paramdef>
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<paramdef>int <parameter>signal</parameter></paramdef>
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<paramdef>sd_event_signal_handler_t <parameter>handler</parameter></paramdef>
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<paramdef>void *<parameter>userdata</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>typedef int (*<function>sd_event_signal_handler_t</function>)</funcdef>
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<paramdef>sd_event_source *<parameter>s</parameter></paramdef>
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<paramdef>const struct signalfd_siginfo *<parameter>si</parameter></paramdef>
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<paramdef>void *<parameter>userdata</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_event_source_get_signal</function></funcdef>
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<paramdef>sd_event_source *<parameter>source</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para><function>sd_event_add_signal()</function> adds a new signal
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event source to an event loop object. The event loop is specified
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in <parameter>event</parameter>, the event source is returned in
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the <parameter>source</parameter> parameter. The
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<parameter>signal</parameter> parameter specifies the signal to be handled
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(see
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<citerefentry><refentrytitle>signal</refentrytitle><manvolnum>7</manvolnum></citerefentry>).
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The <parameter>handler</parameter> must reference a function to
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call when the signal is delivered or be <constant>NULL</constant>.
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The handler function will be passed the
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<parameter>userdata</parameter> pointer, which may be chosen
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freely by the caller. The handler also receives a pointer to a
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<structname>const struct signalfd_siginfo</structname> containing
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the information about the received signal. See
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<citerefentry><refentrytitle>signalfd</refentrytitle><manvolnum>2</manvolnum></citerefentry>
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for futher information.</para>
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<para>Only a single handler may be installed for a specific
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signal. The signal will be unblocked, and must be
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blocked when the function is called. If the handler is not
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specified (<parameter>handler</parameter> is
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<constant>NULL</constant>), a default handler which causes the
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program to exit will be used. By default, the handler is enabled
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permanently (<constant>SD_EVENT_ON</constant>), but this may be
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changed with
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<citerefentry><refentrytitle>sd_event_source_set_enabled</refentrytitle><manvolnum>3</manvolnum></citerefentry>.
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If the handler function returns a negative error code, it will be
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disabled after the invocation, even if
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<constant>SD_EVENT_ON</constant> mode is set.
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</para>
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<para><function>sd_event_source_get_signal()</function> retrieves
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the configured signal number of a signal event source created
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previously with <function>sd_event_add_signal()</function>. It
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takes the event source object as the <parameter>source</parameter>
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parameter.</para>
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</refsect1>
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<refsect1>
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<title>Return Value</title>
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<para>On success, these functions return 0 or a positive
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integer. On failure, they return a negative errno-style error
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code. </para>
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</refsect1>
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<refsect1>
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<title>Errors</title>
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<para>Returned errors may indicate the following problems:</para>
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<variablelist>
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<varlistentry>
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<term><varname>-ENOMEM</varname></term>
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<listitem><para>Not enough memory to allocate an object.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>-EINVAL</varname></term>
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<listitem><para>An invalid argument has been passed.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>-EBUSY</varname></term>
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<listitem><para>An handler is already installed for this
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signal or the signal was not blocked previously.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>-ESTALE</varname></term>
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<listitem><para>The event loop is already terminated.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>-ECHILD</varname></term>
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<listitem><para>The event loop has been created in a different process.</para></listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1>
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<title>Notes</title>
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<para><function>sd_event_add_signal()</function> and the other functions
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described here are available as a shared library, which can be
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compiled and linked to with the
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<constant>libsystemd</constant> <citerefentry project='die-net'><refentrytitle>pkg-config</refentrytitle><manvolnum>1</manvolnum></citerefentry>
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file.</para>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<para>
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<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sd-event</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sd_event_new</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sd_event_add_time</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sd_event_source_set_enabled</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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</para>
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</refsect1>
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</refentry>
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@ -68,6 +68,13 @@ along with systemd; If not, see <http://www.gnu.org/licenses/>.
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<paramdef>void *<parameter>userdata</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>typedef int (*<function>sd_event_time_handler_t</function>)</funcdef>
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<paramdef>sd_event_source *<parameter>s</parameter></paramdef>
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<paramdef>uint64_t <parameter>usec</parameter></paramdef>
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<paramdef>void *<parameter>userdata</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_event_source_get_time</function></funcdef>
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<paramdef>sd_event_source *<parameter>source</parameter></paramdef>
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@ -132,11 +139,15 @@ along with systemd; If not, see <http://www.gnu.org/licenses/>.
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actually have been called at a slightly later time, subject to the
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specified accuracy value, the kernel timer slack (see
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<citerefentry><refentrytitle>prctl</refentrytitle><manvolnum>2</manvolnum></citerefentry>)
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and additional scheduling latencies. By default, the timer will
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elapse once (SD_EVENT_ONESHOT), but this may be changed with
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<citerefentry><refentrytitle>sd_event_source_set_enabled</refentrytitle><manvolnum>3</manvolnum></citerefentry>. If
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the handler function returns a negative error code, it will be
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disabled after the invocation, even if SD_EVENT_ON mode is set.
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and additional scheduling latencies.</para>
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<para>By default, the timer will elapse once
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(<constant>SD_EVENT_ONESHOT</constant>), but this may be changed
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with
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<citerefentry><refentrytitle>sd_event_source_set_enabled</refentrytitle><manvolnum>3</manvolnum></citerefentry>.
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If the handler function returns a negative error code, it will be
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disabled after the invocation, even if
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<constant>SD_EVENT_ON</constant> mode is set.
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</para>
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<para><function>sd_event_source_get_time()</function> retrieves
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@ -187,7 +198,7 @@ along with systemd; If not, see <http://www.gnu.org/licenses/>.
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<varlistentry>
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<term><varname>-ENOMEM</varname></term>
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<listitem><para>Not enough memory to allocate object.</para></listitem>
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<listitem><para>Not enough memory to allocate an object.</para></listitem>
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</varlistentry>
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<varlistentry>
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@ -237,6 +248,7 @@ along with systemd; If not, see <http://www.gnu.org/licenses/>.
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<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sd-event</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sd_event_new</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sd_event_add_signal</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>clock_gettime</refentrytitle><manvolnum>2</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sd_event_source_set_enabled</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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</para>
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