Merge pull request #9221 from poettering/bus-track-destroy
add sd_bus_track and sd_event_source destroy callbacks too
This commit is contained in:
Zbigniew Jędrzejewski-Szmek
GitHub
commit
89278d96dc
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@ -233,7 +233,10 @@ manpages = [
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['sd_bus_set_watch_bind', '3', ['sd_bus_get_watch_bind'], ''],
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['sd_bus_slot_set_destroy_callback',
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'3',
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['sd_bus_slot_get_destroy_callback'],
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['sd_bus_destroy_t',
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'sd_bus_slot_get_destroy_callback',
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'sd_bus_track_get_destroy_callback',
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'sd_bus_track_set_destroy_callback'],
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''],
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['sd_bus_slot_set_floating', '3', ['sd_bus_slot_get_floating'], ''],
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['sd_bus_track_add_name',
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@ -277,9 +280,11 @@ manpages = [
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'sd_event_source',
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'sd_event_source_get_io_events',
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'sd_event_source_get_io_fd',
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'sd_event_source_get_io_fd_own',
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'sd_event_source_get_io_revents',
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'sd_event_source_set_io_events',
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'sd_event_source_set_io_fd'],
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'sd_event_source_set_io_fd',
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'sd_event_source_set_io_fd_own'],
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''],
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['sd_event_add_signal',
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'3',
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@ -314,6 +319,10 @@ manpages = [
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'3',
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['sd_event_source_get_description'],
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''],
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['sd_event_source_set_destroy_callback',
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'3',
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['sd_event_destroy_t', 'sd_event_source_get_destroy_callback'],
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''],
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['sd_event_source_set_enabled',
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'3',
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['SD_EVENT_OFF',
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@ -20,6 +20,9 @@
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<refnamediv>
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<refname>sd_bus_slot_set_destroy_callback</refname>
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<refname>sd_bus_slot_get_destroy_callback</refname>
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<refname>sd_bus_track_set_destroy_callback</refname>
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<refname>sd_bus_track_get_destroy_callback</refname>
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<refname>sd_bus_destroy_t</refname>
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<refpurpose>Define the callback function for resource cleanup.</refpurpose>
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</refnamediv>
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@ -44,35 +47,54 @@
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<paramdef>sd_bus_slot *<parameter>slot</parameter></paramdef>
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<paramdef>sd_bus_destroy_t *<parameter>callback</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_bus_track_set_destroy_callback</function></funcdef>
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<paramdef>sd_bus_track *<parameter>track</parameter></paramdef>
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<paramdef>sd_bus_destroy_t <parameter>callback</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_bus_track_get_destroy_callback</function></funcdef>
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<paramdef>sd_bus_track *<parameter>track</parameter></paramdef>
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<paramdef>sd_bus_destroy_t *<parameter>callback</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_bus_slot_set_destroy_callback()</function> sets
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<parameter>callback</parameter> as the callback function to be called right before the bus slot
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object <parameter>slot</parameter> is deallocated. The <parameter>userdata</parameter> pointer
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from the slot object will be passed as the <parameter>userdata</parameter> parameter. This
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pointer can be set specified as an argument to the constuctor functions, see
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<citerefentry><refentrytitle>sd_bus_add_match</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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or directly, see
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<citerefentry><refentrytitle>sd_bus_set_userdata</refentrytitle><manvolnum>3</manvolnum></citerefentry>.
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This callback function is called even if <parameter>userdata</parameter> is
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<constant>NULL</constant>.</para>
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<para><function>sd_bus_slot_set_destroy_callback()</function> sets <parameter>callback</parameter> as the callback
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function to be called right before the bus slot object <parameter>slot</parameter> is deallocated. The
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<parameter>userdata</parameter> pointer from the slot object will be passed as the <parameter>userdata</parameter>
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parameter. This pointer can be set by an argument to the constructor functions, see
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<citerefentry><refentrytitle>sd_bus_add_match</refentrytitle><manvolnum>3</manvolnum></citerefentry>, or directly,
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see <citerefentry><refentrytitle>sd_bus_slot_set_userdata</refentrytitle><manvolnum>3</manvolnum></citerefentry>.
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This callback function is called even if <parameter>userdata</parameter> is <constant>NULL</constant>. Note that
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this callback is invoked at a time where the bus slot object itself is already invalidated, and executing
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operations or taking new references to the bus slot object is not permissible.</para>
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<para><function>sd_bus_slot_get_destroy_callback()</function> returns the current callback
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for <parameter>slot</parameter> in the <parameter>callback</parameter> parameter.</para>
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<para><function>sd_bus_track_set_destroy_callback()</function> and
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<function>sd_bus_track_get_destroy_callback</function> provide equivalent functionality for the
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<parameter>userdata</parameter> pointer associated with bus peer tracking objects. For details about bus peer
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tracking objects, see
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<citerefentry><refentrytitle>sd_bus_track_new</refentrytitle><manvolnum>3</manvolnum></citerefentry>.</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, <function>sd_bus_slot_set_destroy_callback()</function> returns 0 or a
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positive integer. On failure, it returns a negative errno-style error code.</para>
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<para>On success, <function>sd_bus_slot_set_destroy_callback()</function> and
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<function>sd_bus_track_set_destroy_callback()</function> return 0 or a positive integer. On failure, they return a
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negative errno-style error code.</para>
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<para><function>sd_bus_slot_get_destroy_callback()</function> returns 1 if the destroy callback
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function is set, 0 if not. On failure, it returns a negative errno-style error code.</para>
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<para><function>sd_bus_slot_get_destroy_callback()</function> and
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<function>sd_bus_track_get_destroy_callback</function> return positive if the destroy callback function is set, 0
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if not. On failure, they return a negative errno-style error code.</para>
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</refsect1>
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<refsect1>
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@ -84,8 +106,8 @@
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<varlistentry>
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<term><constant>-EINVAL</constant></term>
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<listitem><para>The <parameter>slot</parameter> parameter is <constant>NULL</constant>.
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</para></listitem>
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<listitem><para>The <parameter>slot</parameter> or <parameter>track</parameter> parameter is
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<constant>NULL</constant>.</para></listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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@ -98,7 +120,11 @@
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<para>
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<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sd-bus</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sd_bus_slot_set_floating</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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<citerefentry><refentrytitle>sd_bus_slot_set_floating</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sd_bus_add_match</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sd_bus_track_new</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sd_bus_slot_set_userdata</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sd_bus_track_set_userdata</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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</para>
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</refsect1>
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@ -38,6 +38,8 @@
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<refname>sd_event_source_get_io_revents</refname>
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<refname>sd_event_source_get_io_fd</refname>
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<refname>sd_event_source_set_io_fd</refname>
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<refname>sd_event_source_get_io_fd_own</refname>
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<refname>sd_event_source_set_io_fd_own</refname>
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<refname>sd_event_source</refname>
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<refname>sd_event_io_handler_t</refname>
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@ -97,6 +99,17 @@
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<paramdef>int <parameter>fd</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_event_source_get_io_fd_own</function></funcdef>
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<paramdef>sd_event_source *<parameter>source</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_event_source_set_io_fd_own</function></funcdef>
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<paramdef>sd_event_source *<parameter>source</parameter></paramdef>
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<paramdef>int <parameter>b</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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</refsynopsisdiv>
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@ -212,6 +225,17 @@
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changes the UNIX file descriptor of an I/O event source created
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previously with <function>sd_event_add_io()</function>. It takes
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the event source object and the new file descriptor.</para>
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<para><function>sd_event_source_set_io_fd_own()</function> controls whether the file descriptor of the event source
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shall be closed automatically when the event source is freed, i.e. whether it shall be considered 'owned' by the
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event source object. By default it is not closed automatically, and the application has to do this on its own. The
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<parameter>b</parameter> parameter is a boolean parameter: if zero, the file descriptor is not closed automatically
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when the event source is freed, otherwise it is closed.</para>
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<para><function>sd_event_source_get_io_fd_own()</function> may be used to query the current setting of the file
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descriptor ownership boolean flag as set with <function>sd_event_source_set_io_fd_own()</function>. It returns
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positive if the file descriptor is closed automatically when the event source is destroyed, zero if not, and
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negative on error.</para>
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</refsect1>
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<refsect1>
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@ -0,0 +1,112 @@
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<?xml version='1.0'?> <!--*- Mode: nxml; nxml-child-indent: 2; indent-tabs-mode: nil -*-->
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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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<!-- SPDX-License-Identifier: LGPL-2.1+ -->
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<refentry id="sd_event_source_set_destroy_callback"
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xmlns:xi="http://www.w3.org/2001/XInclude">
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<refentryinfo>
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<title>sd_event_source_set_destroy_callback</title>
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<productname>systemd</productname>
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</refentryinfo>
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<refmeta>
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<refentrytitle>sd_event_source_set_destroy_callback</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_source_set_destroy_callback</refname>
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<refname>sd_event_source_get_destroy_callback</refname>
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<refname>sd_event_destroy_t</refname>
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<refpurpose>Define the callback function for resource cleanup.</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<funcsynopsis>
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<funcsynopsisinfo>#include <systemd/sd-event.h></funcsynopsisinfo>
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<funcprototype>
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<funcdef>typedef int (*<function>sd_event_destroy_t</function>)</funcdef>
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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_set_destroy_callback</function></funcdef>
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<paramdef>sd_event_source *<parameter>source</parameter></paramdef>
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<paramdef>sd_event_destroy_t <parameter>callback</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_event_source_get_destroy_callback</function></funcdef>
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<paramdef>sd_event_source *<parameter>source</parameter></paramdef>
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<paramdef>sd_event_destroy_t *<parameter>callback</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_source_set_destroy_callback()</function> sets <parameter>callback</parameter> as the
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callback function to be called right before the event source object <parameter>source</parameter> is
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deallocated. The <parameter>userdata</parameter> pointer from the event source object will be passed as the
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<parameter>userdata</parameter> parameter. This pointer can be set by an argument to the constructor functions, see
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<citerefentry><refentrytitle>sd_event_add_io</refentrytitle><manvolnum>3</manvolnum></citerefentry>, or directly,
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see
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<citerefentry><refentrytitle>sd_event_source_set_userdata</refentrytitle><manvolnum>3</manvolnum></citerefentry>.
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This callback function is called even if <parameter>userdata</parameter> is <constant>NULL</constant>. Note that
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this callback is invoked at a time where the event source object itself is already invalidated, and executing
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operations or taking new references to the event source object is not permissible.</para>
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<para><function>sd_event_source_get_destroy_callback()</function> returns the current callback
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for <parameter>source</parameter> in the <parameter>callback</parameter> 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, <function>sd_event_source_set_destroy_callback()</function> returns 0 or a positive integer. On
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failure, it returns a negative errno-style error code.</para>
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<para><function>sd_event_source_get_destroy_callback()</function> returns positive if the destroy callback function
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is set, 0 if not. On failure, returns a negative errno-style error 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><constant>-EINVAL</constant></term>
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<listitem><para>The <parameter>source</parameter> parameter is <constant>NULL</constant>.</para></listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<xi:include href="libsystemd-pkgconfig.xml" />
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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_add_io</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_add_signal</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sd_event_add_child</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sd_event_add_inotify</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sd_event_add_defer</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sd_event_source_set_userdata</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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</para>
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</refsect1>
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</refentry>
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@ -565,6 +565,10 @@ global:
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sd_bus_slot_set_floating;
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sd_bus_slot_get_destroy_callback;
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sd_bus_slot_set_destroy_callback;
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sd_bus_track_get_destroy_callback;
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sd_bus_track_set_destroy_callback;
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sd_event_add_inotify;
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sd_event_source_get_inotify_mask;
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sd_event_source_set_destroy_callback;
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sd_event_source_get_destroy_callback;
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} LIBSYSTEMD_238;
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@ -31,6 +31,7 @@ struct sd_bus_track {
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bool in_queue:1; /* In bus->track_queue? */
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bool modified:1;
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bool recursive:1;
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sd_bus_destroy_t destroy_callback;
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LIST_FIELDS(sd_bus_track, tracks);
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};
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@ -164,18 +165,21 @@ _public_ sd_bus_track* sd_bus_track_unref(sd_bus_track *track) {
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return NULL;
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assert(track->n_ref > 0);
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track->n_ref--;
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if (track->n_ref > 1) {
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track->n_ref--;
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if (track->n_ref > 0)
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return NULL;
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}
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if (track->in_list)
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LIST_REMOVE(tracks, track->bus->tracks, track);
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bus_track_remove_from_queue(track);
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hashmap_free_with_destructor(track->names, track_item_free);
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sd_bus_unref(track->bus);
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track->names = hashmap_free_with_destructor(track->names, track_item_free);
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track->bus = sd_bus_unref(track->bus);
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if (track->destroy_callback)
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track->destroy_callback(track->userdata);
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return mfree(track);
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}
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@ -439,6 +443,22 @@ _public_ void *sd_bus_track_set_userdata(sd_bus_track *track, void *userdata) {
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return ret;
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}
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_public_ int sd_bus_track_set_destroy_callback(sd_bus_track *track, sd_bus_destroy_t callback) {
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assert_return(track, -EINVAL);
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track->destroy_callback = callback;
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return 0;
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}
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_public_ int sd_bus_track_get_destroy_callback(sd_bus_track *track, sd_bus_destroy_t *ret) {
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assert_return(track, -EINVAL);
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if (ret)
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*ret = track->destroy_callback;
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return !!track->destroy_callback;
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}
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_public_ int sd_bus_track_set_recursive(sd_bus_track *track, int b) {
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assert_return(track, -EINVAL);
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@ -106,6 +106,8 @@ struct sd_event_source {
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uint64_t pending_iteration;
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uint64_t prepare_iteration;
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sd_event_destroy_t destroy_callback;
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LIST_FIELDS(sd_event_source, sources);
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union {
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@ -1016,7 +1018,10 @@ static void source_free(sd_event_source *s) {
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source_disconnect(s);
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|
||||
if (s->type == SOURCE_IO && s->io.owned)
|
||||
safe_close(s->io.fd);
|
||||
s->io.fd = safe_close(s->io.fd);
|
||||
|
||||
if (s->destroy_callback)
|
||||
s->destroy_callback(s->userdata);
|
||||
|
||||
free(s->description);
|
||||
free(s);
|
||||
|
|
@ -3775,3 +3780,19 @@ _public_ int sd_event_get_iteration(sd_event *e, uint64_t *ret) {
|
|||
*ret = e->iteration;
|
||||
return 0;
|
||||
}
|
||||
|
||||
_public_ int sd_event_source_set_destroy_callback(sd_event_source *s, sd_event_destroy_t callback) {
|
||||
assert_return(s, -EINVAL);
|
||||
|
||||
s->destroy_callback = callback;
|
||||
return 0;
|
||||
}
|
||||
|
||||
_public_ int sd_event_source_get_destroy_callback(sd_event_source *s, sd_event_destroy_t *ret) {
|
||||
assert_return(s, -EINVAL);
|
||||
|
||||
if (ret)
|
||||
*ret = s->destroy_callback;
|
||||
|
||||
return !!s->destroy_callback;
|
||||
}
|
||||
|
|
|
|||
|
|
@ -485,6 +485,9 @@ const char* sd_bus_track_contains(sd_bus_track *track, const char *name);
|
|||
const char* sd_bus_track_first(sd_bus_track *track);
|
||||
const char* sd_bus_track_next(sd_bus_track *track);
|
||||
|
||||
int sd_bus_track_set_destroy_callback(sd_bus_track *s, sd_bus_destroy_t callback);
|
||||
int sd_bus_track_get_destroy_callback(sd_bus_track *s, sd_bus_destroy_t *ret);
|
||||
|
||||
/* Define helpers so that __attribute__((cleanup(sd_bus_unrefp))) and similar may be used. */
|
||||
_SD_DEFINE_POINTER_CLEANUP_FUNC(sd_bus, sd_bus_unref);
|
||||
_SD_DEFINE_POINTER_CLEANUP_FUNC(sd_bus, sd_bus_flush_close_unref);
|
||||
|
|
|
|||
|
|
@ -80,6 +80,7 @@ typedef int (*sd_event_child_handler_t)(sd_event_source *s, const siginfo_t *si,
|
|||
typedef void* sd_event_child_handler_t;
|
||||
#endif
|
||||
typedef int (*sd_event_inotify_handler_t)(sd_event_source *s, const struct inotify_event *event, void *userdata);
|
||||
typedef void (*sd_event_destroy_t)(void *userdata);
|
||||
|
||||
int sd_event_default(sd_event **e);
|
||||
|
||||
|
|
@ -143,6 +144,8 @@ int sd_event_source_get_time_clock(sd_event_source *s, clockid_t *clock);
|
|||
int sd_event_source_get_signal(sd_event_source *s);
|
||||
int sd_event_source_get_child_pid(sd_event_source *s, pid_t *pid);
|
||||
int sd_event_source_get_inotify_mask(sd_event_source *s, uint32_t *ret);
|
||||
int sd_event_source_set_destroy_callback(sd_event_source *s, sd_event_destroy_t callback);
|
||||
int sd_event_source_get_destroy_callback(sd_event_source *s, sd_event_destroy_t *ret);
|
||||
|
||||
/* Define helpers so that __attribute__((cleanup(sd_event_unrefp))) and similar may be used. */
|
||||
_SD_DEFINE_POINTER_CLEANUP_FUNC(sd_event, sd_event_unref);
|
||||
|
|
|
|||
Loading…
Reference in New Issue