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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | NOTES | HISTORY | 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.
Functions described here are available as a shared library, which
can be compiled against and linked to with the
libsystemd pkg-config(1) file.
The code described here uses getenv(3), which is declared to be
not multi-thread-safe. This means that the code calling the
functions described here must not call setenv(3) from a parallel
thread. It is recommended to only do calls to setenv() from an
early phase of the program when no other threads have been
started.
sd_bus_slot_ref(), sd_bus_slot_unref(), and sd_bus_slot_unrefp()
were added in version 240.
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 2024-06-14. (At that
time, the date of the most recent commit that was found in the
repository was 2024-06-13.) 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
[email protected]
systemd 257~devel 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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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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