''],
['sd_event_now', '3', [], ''],
['sd_event_run', '3', ['sd_event_loop'], ''],
+ ['sd_event_set_signal_exit', '3', [], ''],
['sd_event_set_watchdog', '3', ['sd_event_get_watchdog'], ''],
['sd_event_source_get_event', '3', [], ''],
['sd_event_source_get_pending', '3', [], ''],
--- /dev/null
+<?xml version='1.0'?>
+<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
+ "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
+<!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
+
+<refentry id="sd_event_set_signal_exit" xmlns:xi="http://www.w3.org/2001/XInclude">
+
+ <refentryinfo>
+ <title>sd_event_set_signal_exit</title>
+ <productname>systemd</productname>
+ </refentryinfo>
+
+ <refmeta>
+ <refentrytitle>sd_event_set_signal_exit</refentrytitle>
+ <manvolnum>3</manvolnum>
+ </refmeta>
+
+ <refnamediv>
+ <refname>sd_event_set_signal_exit</refname>
+
+ <refpurpose>Automatically leave event loop on <constant>SIGINT</constant> and <constant>SIGTERM</constant></refpurpose>
+ </refnamediv>
+
+ <refsynopsisdiv>
+ <funcsynopsis>
+ <funcsynopsisinfo>#include <systemd/sd-event.h></funcsynopsisinfo>
+
+ <funcprototype>
+ <funcdef>int <function>sd_event_set_signal_exit</function></funcdef>
+ <paramdef>sd_event *<parameter>event</parameter></paramdef>
+ <paramdef>int b</paramdef>
+ </funcprototype>
+
+ </funcsynopsis>
+ </refsynopsisdiv>
+
+ <refsect1>
+ <title>Description</title>
+
+ <para><function>sd_event_set_signal_exit()</function> may be used to ensure the event loop terminates
+ once a <constant>SIGINT</constant> or <constant>SIGTERM</constant> signal is received. It is a
+ convencience wrapper around invocations of
+ <citerefentry><refentrytitle>sd_event_add_signal</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+ for both signals. The two signals are automatically added to the calling thread's signal mask (if a
+ program is multi-threaded care should be taken to either invoke this function before the first thread is
+ started or to manually block the two signals process-wide first).</para>
+
+ <para>If the parameter <parameter>b</parameter> is specified as true, the event loop will terminate on
+ <constant>SIGINT</constant> and <constant>SIGTERM</constant>. If specified as false, it will no
+ longer. When this functionality is turned off the calling thread's signal mask is restored to match the
+ state before it was turned on, for the two signals. By default the two signals are not handled by the
+ event loop, and Linux' default signal handling for them is in effect.</para>
+
+ <para>It's customary for UNIX programs to exit on either of these two signals, hence it's typically a
+ good idea to enable this functionality for the main event loop of a program.</para>
+ </refsect1>
+
+ <refsect1>
+ <title>Return Value</title>
+
+ <para><function>sd_event_set_signal_exit()</function> returns a positive non-zero value when the setting
+ was successfully changed. It returns a zero when the specified setting was already in effect. On failure,
+ it returns a negative errno-style error code.</para>
+
+ <refsect2>
+ <title>Errors</title>
+
+ <para>Returned errors may indicate the following problems:</para>
+
+ <variablelist>
+
+ <varlistentry>
+ <term><constant>-ECHILD</constant></term>
+
+ <listitem><para>The event loop has been created in a different process.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><constant>-EINVAL</constant></term>
+
+ <listitem><para>The passed event loop object was invalid.</para></listitem>
+ </varlistentry>
+
+ </variablelist>
+ </refsect2>
+ </refsect1>
+
+ <xi:include href="libsystemd-pkgconfig.xml" />
+
+ <refsect1>
+ <title>See Also</title>
+
+ <para>
+ <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>sd-event</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>sd_event_new</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>sd_event_add_signal</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+ </para>
+ </refsect1>
+
+</refentry>
sd_device_monitor_set_description;
sd_device_monitor_get_description;
+ sd_event_set_signal_exit;
+
sd_id128_string_equal;
sd_hwdb_new_from_path;
LIST_HEAD(sd_event_source, sources);
+ sd_event_source *sigint_event_source, *sigterm_event_source;
+
usec_t last_run_usec, last_log_usec;
unsigned delays[sizeof(usec_t) * 8];
};
assert(e);
+ e->sigterm_event_source = sd_event_source_unref(e->sigterm_event_source);
+ e->sigint_event_source = sd_event_source_unref(e->sigint_event_source);
+
while ((s = e->sources)) {
assert(s->floating);
source_disconnect(s);
return s->ratelimited;
}
+
+_public_ int sd_event_set_signal_exit(sd_event *e, int b) {
+ bool change = false;
+ int r;
+
+ assert_return(e, -EINVAL);
+
+ if (b) {
+ /* We want to maintain pointers to these event sources, so that we can destroy them when told
+ * so. But we also don't want them to pin the event loop itself. Hence we mark them as
+ * floating after creation (and undo this before deleting them again). */
+
+ if (!e->sigint_event_source) {
+ r = sd_event_add_signal(e, &e->sigint_event_source, SIGINT | SD_EVENT_SIGNAL_PROCMASK, NULL, NULL);
+ if (r < 0)
+ return r;
+
+ assert(sd_event_source_set_floating(e->sigint_event_source, true) >= 0);
+ change = true;
+ }
+
+ if (!e->sigterm_event_source) {
+ r = sd_event_add_signal(e, &e->sigterm_event_source, SIGTERM | SD_EVENT_SIGNAL_PROCMASK, NULL, NULL);
+ if (r < 0) {
+ if (change) {
+ assert(sd_event_source_set_floating(e->sigint_event_source, false) >= 0);
+ e->sigint_event_source = sd_event_source_unref(e->sigint_event_source);
+ }
+
+ return r;
+ }
+
+ assert(sd_event_source_set_floating(e->sigterm_event_source, true) >= 0);
+ change = true;
+ }
+
+ } else {
+ if (e->sigint_event_source) {
+ assert(sd_event_source_set_floating(e->sigint_event_source, false) >= 0);
+ e->sigint_event_source = sd_event_source_unref(e->sigint_event_source);
+ change = true;
+ }
+
+ if (e->sigterm_event_source) {
+ assert(sd_event_source_set_floating(e->sigterm_event_source, false) >= 0);
+ e->sigterm_event_source = sd_event_source_unref(e->sigterm_event_source);
+ change = true;
+ }
+ }
+
+ return change;
+}
int sd_event_set_watchdog(sd_event *e, int b);
int sd_event_get_watchdog(sd_event *e);
int sd_event_get_iteration(sd_event *e, uint64_t *ret);
+int sd_event_set_signal_exit(sd_event *e, int b);
sd_event_source* sd_event_source_ref(sd_event_source *s);
sd_event_source* sd_event_source_unref(sd_event_source *s);