создание и уничтожение ссылок на объект слота шины (Create and destroy references to a bus slot object)
Имя (Name)
sd_bus_slot_ref, sd_bus_slot_unref, sd_bus_slot_unrefp - Create
and destroy references to a bus slot object
Синопсис (Synopsis)
#include <systemd/sd-bus.h>
sd_bus_slot *sd_bus_slot_ref(sd_bus_slot *slot);
sd_bus_slot *sd_bus_slot_unref(sd_bus_slot *slot);
void sd_bus_slot_unrefp(sd_bus_slot **slotp);
Описание (Description)
sd_bus_slot_ref() increases the reference counter of slot by one.
sd_bus_slot_unref() decreases the reference counter of slot by
one. Once the reference count has dropped to zero, slot object is
destroyed and cannot be used anymore, so further calls to
sd_bus_slot_ref() or sd_bus_slot_unref() are illegal.
sd_bus_slot_unrefp() is similar to sd_bus_slot_unref() but takes
a pointer to a pointer to an sd_bus_slot object. This call is
useful in conjunction with GCC's and LLVM's Clean-up Variable
Attribute
sd_bus_slot_ref() and sd_bus_slot_unref() execute no operation if
the passed in bus object address is NULL. sd_bus_slot_unrefp()
will first dereference its argument, which must not be NULL, and
will execute no operation if that is NULL.
Возвращаемое значение (Return value)
sd_bus_slot_ref() always returns the argument.
sd_bus_slot_unref() always returns NULL.
Примечание (Note)
These APIs are implemented as a shared library, which can be
compiled and linked to with the libsystemd pkg-config(1) file.
Смотри также (See also)
systemd(1), sd-bus(3), sd_bus_new(3), sd_bus_message_new(3),
sd_bus_call_method_async(3)
Примечание (Note)
1. Clean-up Variable Attribute
https://gcc.gnu.org/onlinedocs/gcc/Common-Variable-Attributes.html
