core: add a new sd_notify() message for removing fds from the FD store again

Currenly the only way to remove fds from the fdstore is to fully
stop the service, or to somehow trigger POLLERR/POLLHUP on the fd, in
which case systemd will remove the fd automatically.

Let's add another way: a new message that can be sent to remove fds
explicitly, given their name.

1 files changed, 9 insertions, 0 deletions

diff --git a/src/systemd/sd-daemon.h b/src/systemd/sd-daemon.h
index 3fd0cc60e3..9772a05dad 100644
--- a/src/systemd/sd-daemon.h
+++ b/src/systemd/sd-daemon.h
@@ -222,6 +222,15 @@ int sd_is_mq(int fd, const char *path);
                   invocation. This variable is only supported with
                   sd_pid_notify_with_fds().
 
+     FDSTOREREMOVE=1
+                  Remove one or more file descriptors from the file
+                  descriptor store, identified by the name specified
+                  in FDNAME=, see below.
+
+     FDNAME=      A name to assign to new file descriptors stored in the
+                  file descriptor store, or the name of the file descriptors
+                  to remove in case of FDSTOREREMOVE=1.
+
   Daemons can choose to send additional variables. However, it is
   recommended to prefix variable names not listed above with X_.