core: add new logic for services to store file descriptors in PID 1

With this change it is possible to send file descriptors to PID 1, via
sd_pid_notify_with_fds() which PID 1 will store individually for each
service, and pass via the usual fd passing logic on next invocation.
This is useful for enable daemon reload schemes where daemons serialize
their state to /run, push their fds into PID 1 and terminate, restoring
their state on next start from the data in /run and passed in from PID
1.

The fds are kept by PID 1 as long as no POLLHUP or POLLERR is seen on
them, and the service they belong to are either not dead or failed, or
have a job queued.

1 files changed, 14 insertions, 0 deletions

diff --git a/src/core/service.h b/src/core/service.h
index f6a78c403b..dfeee6a68c 100644
--- a/src/core/service.h
+++ b/src/core/service.h
@@ -22,6 +22,7 @@
 ***/
 
 typedef struct Service Service;
+typedef struct ServiceFDStore ServiceFDStore;
 
 #include "unit.h"
 #include "path.h"
@@ -115,6 +116,15 @@ typedef enum ServiceResult {
         _SERVICE_RESULT_INVALID = -1
 } ServiceResult;
 
+struct ServiceFDStore {
+        Service *service;
+
+        int fd;
+        sd_event_source *event_source;
+
+        LIST_FIELDS(ServiceFDStore, fd_store);
+};
+
 struct Service {
         Unit meta;
 
@@ -198,6 +208,10 @@ struct Service {
 
         NotifyAccess notify_access;
         NotifyState notify_state;
+
+        ServiceFDStore *fd_store;
+        unsigned n_fd_store;
+        unsigned n_fd_store_max;
 };
 
 extern const UnitVTable service_vtable;