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man: mention that SIGCHLD has to be blocked before using sd_event_add_child()

This commit is contained in:
Lennart Poettering 2019-10-30 18:59:44 +01:00
parent 68765d94fe
commit b350807200
1 changed files with 11 additions and 3 deletions
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14
man/sd_event_add_child.xml
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@ -100,6 +100,12 @@
<constant>SD_EVENT_OFF</constant> with
<citerefentry><refentrytitle>sd_event_source_set_enabled</refentrytitle><manvolnum>3</manvolnum></citerefentry>.</para>
<para>The <constant>SIGCHLD</constant> signal must be blocked in all threads before this function is
called (using <citerefentry
project='man-pages'><refentrytitle>sigprocmask</refentrytitle><manvolnum>2</manvolnum></citerefentry> or
<citerefentry
project='man-pages'><refentrytitle>pthread_sigmask</refentrytitle><manvolnum>3</manvolnum></citerefentry>).</para>
<para>If the second parameter of
<function>sd_event_add_child()</function> is passed as NULL no
reference to the event source object is returned. In this case the
@ -165,8 +171,8 @@
<varlistentry>
<term><constant>-EBUSY</constant></term>
<listitem><para>A handler is already installed for this
child process.</para></listitem>
<listitem><para>A handler is already installed for this child process, or
<constant>SIGCHLD</constant> is not blocked.</para></listitem>
</varlistentry>
@ -214,7 +220,9 @@
<citerefentry><refentrytitle>sd_event_source_set_userdata</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_event_source_set_description</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_event_source_set_floating</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry project='man-pages'><refentrytitle>waitid</refentrytitle><manvolnum>2</manvolnum></citerefentry>
<citerefentry project='man-pages'><refentrytitle>waitid</refentrytitle><manvolnum>2</manvolnum></citerefentry>,
<citerefentry project='man-pages'><refentrytitle>sigprocmask</refentrytitle><manvolnum>2</manvolnum></citerefentry>,
<citerefentry project='man-pages'><refentrytitle>pthread_sigmask</refentrytitle><manvolnum>3</manvolnum></citerefentry>
</para>
</refsect1>