diff options
Diffstat (limited to 'man/sd_listen_fds.xml')
| -rw-r--r-- | man/sd_listen_fds.xml | 21 |
1 files changed, 16 insertions, 5 deletions
diff --git a/man/sd_listen_fds.xml b/man/sd_listen_fds.xml index 6999db9804..4377745634 100644 --- a/man/sd_listen_fds.xml +++ b/man/sd_listen_fds.xml @@ -73,7 +73,7 @@ <para>If the <parameter>unset_environment</parameter> parameter is non-zero, <function>sd_listen_fds()</function> will unset the - <varname>$LISTEN_FDS</varname>/<varname>$LISTEN_PID</varname> + <varname>$LISTEN_FDS</varname> and <varname>$LISTEN_PID</varname> environment variables before returning (regardless of whether the function call itself succeeded or not). Further calls to @@ -83,10 +83,11 @@ <para>If a daemon receives more than one file descriptor, they will be passed in the same order as - configured in the systemd socket definition - file. Nonetheless, it is recommended to verify the - correct socket types before using them. To simplify - this checking, the functions + configured in the systemd socket unit file (see + <citerefentry><refentrytitle>systemd.socket</refentrytitle><manvolnum>5</manvolnum></citerefentry> + for details). Nonetheless, it is recommended to verify + the correct socket types before using them. To + simplify this checking, the functions <citerefentry><refentrytitle>sd_is_fifo</refentrytitle><manvolnum>3</manvolnum></citerefentry>, <citerefentry><refentrytitle>sd_is_socket</refentrytitle><manvolnum>3</manvolnum></citerefentry>, <citerefentry><refentrytitle>sd_is_socket_inet</refentrytitle><manvolnum>3</manvolnum></citerefentry>, @@ -103,6 +104,16 @@ <para>This function call will set the FD_CLOEXEC flag for all passed file descriptors to avoid further inheritance to children of the calling process.</para> + + <para>If multiple socket units activate the same + service the order of the file descriptors passed to + its main process is undefined. If additional file + descriptors have been passed to the service manager + using + <citerefentry><refentrytitle>sd_pid_notify_with_fds</refentrytitle><manvolnum>3</manvolnum></citerefentry>'s + <literal>FDSTORE=1</literal> messages, these file + descriptors are passed last, in arbitrary order, and + with duplicates removed.</para> </refsect1> <refsect1> |