sd_bus_slot_unref(3) — Linux manual page


SD_BUS_SLOT_REF(3)             sd_bus_slot_ref            SD_BUS_SLOT_REF(3)

NAME         top

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

SYNOPSIS         top

       #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         top

       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[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         top

       sd_bus_slot_ref() always returns the argument.

       sd_bus_slot_unref() always returns NULL.

NOTES         top

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

SEE ALSO         top

       systemd(1), sd-bus(3), sd_bus_new(3), sd_bus_message_new(3),

NOTES         top

        1. Clean-up Variable Attribute

COLOPHON         top

       This page is part of the systemd (systemd system and service manager)
       project.  Information about the project can be found at 
       ⟨⟩.  If you have a bug
       report for this manual page, see
       ⟨⟩.  This
       page was obtained from the project's upstream Git repository
       ⟨⟩ on 2020-09-18.  (At that
       time, the date of the most recent commit that was found in the repos‐
       itory was 2020-09-18.)  If you discover any rendering problems in
       this HTML version of the page, or you believe there is a better or
       more up-to-date source for the page, or you have corrections or
       improvements to the information in this COLOPHON (which is not part
       of the original manual page), send a mail to

systemd 246                                               SD_BUS_SLOT_REF(3)

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