SD_BUS_SLOT_REF(3)              sd_bus_slot_ref             SD_BUS_SLOT_REF(3)

NAME
       sd_bus_slot_ref, sd_bus_slot_unref, sd_bus_slot_unrefp - Create and
       destroy references to a bus slot object

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);

DESCRIPTION
       sd_bus_slot_ref() increases the internal reference counter of slot by
       one.

       sd_bus_slot_unref() decreases the internal 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[1]. See
       sd_bus_new(3) for an example how to use the cleanup 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.

RETURN VALUE
       sd_bus_slot_ref() always returns the argument.

       sd_bus_slot_unref() always returns NULL.

NOTES
       These APIs are implemented as a shared library, which can be compiled
       and linked to with the libsystemd pkg-config(1) file.

SEE ALSO
       systemd(1), sd-bus(3), sd_bus_new(3), sd_bus_message_new(3),
       sd_bus_call_method_async(3)

NOTES
        1. Clean-up Variable Attribute
           https://gcc.gnu.org/onlinedocs/gcc/Common-Variable-Attributes.html

systemd 252                                                 SD_BUS_SLOT_REF(3)

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