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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 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.
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 2020-12-18. (At that
time, the date of the most recent commit that was found in the
repository was 2020-12-18.) 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
man-pages@man7.org
systemd 247 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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