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https://github.com/systemd/systemd
synced 2024-10-06 16:21:34 +00:00
sd-event: add destroy callback logic to sd-event too
This adds what has been added to sd_bus_slot and sd_bus_track to sd_event too.
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@ -317,6 +317,10 @@ 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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112
man/sd_event_source_set_destroy_callback.xml
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112
man/sd_event_source_set_destroy_callback.xml
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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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@ -569,4 +569,6 @@ global:
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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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@ -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)
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safe_close(s->io.fd);
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s->io.fd = safe_close(s->io.fd);
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if (s->destroy_callback)
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s->destroy_callback(s->userdata);
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free(s->description);
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free(s);
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@ -3775,3 +3780,19 @@ _public_ int sd_event_get_iteration(sd_event *e, uint64_t *ret) {
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*ret = e->iteration;
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return 0;
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}
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_public_ int sd_event_source_set_destroy_callback(sd_event_source *s, sd_event_destroy_t callback) {
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assert_return(s, -EINVAL);
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s->destroy_callback = callback;
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return 0;
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}
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_public_ int sd_event_source_get_destroy_callback(sd_event_source *s, sd_event_destroy_t *ret) {
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assert_return(s, -EINVAL);
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if (ret)
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*ret = s->destroy_callback;
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return !!s->destroy_callback;
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}
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@ -80,6 +80,7 @@ typedef int (*sd_event_child_handler_t)(sd_event_source *s, const siginfo_t *si,
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typedef void* sd_event_child_handler_t;
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#endif
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typedef int (*sd_event_inotify_handler_t)(sd_event_source *s, const struct inotify_event *event, void *userdata);
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typedef void (*sd_event_destroy_t)(void *userdata);
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int sd_event_default(sd_event **e);
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@ -143,6 +144,8 @@ int sd_event_source_get_time_clock(sd_event_source *s, clockid_t *clock);
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int sd_event_source_get_signal(sd_event_source *s);
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int sd_event_source_get_child_pid(sd_event_source *s, pid_t *pid);
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int sd_event_source_get_inotify_mask(sd_event_source *s, uint32_t *ret);
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int sd_event_source_set_destroy_callback(sd_event_source *s, sd_event_destroy_t callback);
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int sd_event_source_get_destroy_callback(sd_event_source *s, sd_event_destroy_t *ret);
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/* Define helpers so that __attribute__((cleanup(sd_event_unrefp))) and similar may be used. */
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_SD_DEFINE_POINTER_CLEANUP_FUNC(sd_event, sd_event_unref);
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