man7.org > Linux > man-pages

Linux/UNIX system programming training

sd_bus_slot_get_bus(3) — Linux manual page

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | NOTES | SEE ALSO | COLOPHON 

SD_BUS_SLOT_GET_BUS(3)     sd_bus_slot_get_bus    SD_BUS_SLOT_GET_BUS(3)

NAME         top

       sd_bus_slot_get_bus, sd_bus_slot_get_current_handler,
       sd_bus_slot_get_current_message, sd_bus_slot_get_current_userdata
       - Query information attached to a bus slot object

SYNOPSIS         top

       #include <systemd/sd-bus.h>

       typedef int (*sd_bus_message_handler_t)(sd_bus_message *m,
                                               void *userdata,
                                               sd_bus_error *ret_error);

       sd_bus *sd_bus_slot_get_bus(sd_bus_slot *slot);

       sd_bus_message_handler_t
                                                                sd_bus_slot_get_current_handler(sd_bus_slot *slot);

       sd_bus_message
                                                       *sd_bus_slot_get_current_message(sd_bus_slot *slot);

       void *sd_bus_slot_get_current_userdata(sd_bus_slot *slot);

DESCRIPTION         top

       sd_bus_slot_get_bus() returns the bus object that message slot is
       attached to.

       sd_bus_slot_get_current_handler(),
       sd_bus_slot_get_current_message() and
       sd_bus_slot_get_current_userdata() return the current handler,
       message and userdata respectively of the bus slot is attached to
       if we're currently executing the callback associated with slot.

RETURN VALUE         top

       sd_bus_slot_get_bus() always returns the bus object.

       On success, sd_bus_slot_get_current_handler(),
       sd_bus_slot_get_current_message() and
       sd_bus_slot_get_current_userdata() return the requested object.
       On failure, they return NULL.

NOTES         top

       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.

SEE ALSO         top

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

COLOPHON         top

       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 2023-06-23.  (At that
       time, the date of the most recent commit that was found in the
       repository was 2023-06-23.)  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 253                                       SD_BUS_SLOT_GET_BUS(3)

Pages that refer to this page: sd-bus(3),  sd_bus_slot_set_userdata(3),  systemd.directives(7),  systemd.index(7)

HTML rendering created 2023-06-24 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.

Cover of TLPI