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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | NOTES | SEE ALSO | NOTES | COLOPHON |
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SD_BUS_SLOT_REF(3) sd_bus_slot_ref SD_BUS_SLOT_REF(3)
sd_bus_slot_ref, sd_bus_slot_unref, sd_bus_slot_unrefp - Create
and destroy references to a bus slot object
#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);
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.
sd_bus_slot_ref() always returns the argument.
sd_bus_slot_unref() always returns NULL.
These APIs are implemented as a shared library, which can be
compiled and linked to with the libsystemd pkg-config(1) file.
systemd(1), sd-bus(3), sd_bus_new(3), sd_bus_message_new(3),
sd_bus_call_method_async(3)
1. Clean-up Variable Attribute
https://gcc.gnu.org/onlinedocs/gcc/Common-Variable-Attributes.html
This page is part of the systemd (systemd system and service
manager) project. Information about the project can be found at
⟨http://www.freedesktop.org/wiki/Software/systemd⟩. If you have
a bug report for this manual page, see
⟨http://www.freedesktop.org/wiki/Software/systemd/#bugreports⟩.
This page was obtained from the project's upstream Git repository
⟨https://github.com/systemd/systemd.git⟩ on 2022-12-17. (At that
time, the date of the most recent commit that was found in the
repository was 2022-12-16.) 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
man-pages@man7.org
systemd 252 SD_BUS_SLOT_REF(3)
Pages that refer to this page: sd_bus_add_match(3), sd_bus_add_node_enumerator(3), sd_bus_add_object(3), sd_bus_add_object_manager(3), sd_bus_call(3), sd_bus_request_name(3), sd_bus_slot_set_description(3), systemd.directives(7), systemd.index(7)
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