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authorLennart Poettering <lennart@poettering.net>2016-08-15 18:12:01 +0200
committerLennart Poettering <lennart@poettering.net>2016-08-22 16:14:21 +0200
commit05a98afd3e0513de50c5949b7fa50ff0989d68bc (patch)
tree74ef3320a2f75dac4285843098b2b33e5e0c817c /src/libsystemd
parentecddb2b586d1b69e5538fb85262d2b9e6d253ac0 (diff)
core: add Ref()/Unref() bus calls for units
This adds two (privileged) bus calls Ref() and Unref() to the Unit interface. The two calls may be used by clients to pin a unit into memory, so that various runtime properties aren't flushed out by the automatic GC. This is necessary to permit clients to race-freely acquire runtime results (such as process exit status/code or accumulated CPU time) on successful service termination. Ref() and Unref() are fully recursive, hence act like the usual reference counting concept in C. Taking a reference is a privileged operation, as this allows pinning units into memory which consumes resources. Transient units may also gain a reference at the time of creation, via the new AddRef property (that is only defined for transient units at the time of creation).
Diffstat (limited to 'src/libsystemd')
-rw-r--r--src/libsystemd/sd-bus/bus-common-errors.c1
-rw-r--r--src/libsystemd/sd-bus/bus-common-errors.h1
2 files changed, 2 insertions, 0 deletions
diff --git a/src/libsystemd/sd-bus/bus-common-errors.c b/src/libsystemd/sd-bus/bus-common-errors.c
index 32be3cdc38..a69193aa32 100644
--- a/src/libsystemd/sd-bus/bus-common-errors.c
+++ b/src/libsystemd/sd-bus/bus-common-errors.c
@@ -45,6 +45,7 @@ BUS_ERROR_MAP_ELF_REGISTER const sd_bus_error_map bus_common_errors[] = {
SD_BUS_ERROR_MAP(BUS_ERROR_SHUTTING_DOWN, ECANCELED),
SD_BUS_ERROR_MAP(BUS_ERROR_SCOPE_NOT_RUNNING, EHOSTDOWN),
SD_BUS_ERROR_MAP(BUS_ERROR_NO_SUCH_DYNAMIC_USER, ESRCH),
+ SD_BUS_ERROR_MAP(BUS_ERROR_NOT_REFERENCED, EUNATCH),
SD_BUS_ERROR_MAP(BUS_ERROR_NO_SUCH_MACHINE, ENXIO),
SD_BUS_ERROR_MAP(BUS_ERROR_NO_SUCH_IMAGE, ENOENT),
diff --git a/src/libsystemd/sd-bus/bus-common-errors.h b/src/libsystemd/sd-bus/bus-common-errors.h
index befb6fbfe0..5df21c8926 100644
--- a/src/libsystemd/sd-bus/bus-common-errors.h
+++ b/src/libsystemd/sd-bus/bus-common-errors.h
@@ -41,6 +41,7 @@
#define BUS_ERROR_SHUTTING_DOWN "org.freedesktop.systemd1.ShuttingDown"
#define BUS_ERROR_SCOPE_NOT_RUNNING "org.freedesktop.systemd1.ScopeNotRunning"
#define BUS_ERROR_NO_SUCH_DYNAMIC_USER "org.freedesktop.systemd1.NoSuchDynamicUser"
+#define BUS_ERROR_NOT_REFERENCED "org.freedesktop.systemd1.NotReferenced"
#define BUS_ERROR_NO_SUCH_MACHINE "org.freedesktop.machine1.NoSuchMachine"
#define BUS_ERROR_NO_SUCH_IMAGE "org.freedesktop.machine1.NoSuchImage"