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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | NOTES | HISTORY | SEE ALSO | COLOPHON |
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SD_BUS_G..._HANDLER(3) sd_bus_get_current_handler SD_BUS_G..._HANDLER(3)
sd_bus_get_current_handler, sd_bus_get_current_message,
sd_bus_get_current_slot, sd_bus_get_current_userdata - Query
information of the callback a bus object is currently running
#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_message_handler_t sd_bus_get_current_handler(sd_bus *bus);
sd_bus_message* sd_bus_get_current_message(sd_bus *bus);
sd_bus_slot* sd_bus_get_current_slot(sd_bus *bus);
void* sd_bus_get_current_userdata(sd_bus *bus);
Whenever sd-bus is about to invoke a user-supplied callback
function, it stores the current callback, D-Bus message, slot and
userdata pointer and allows these to be queried via
sd_bus_get_current_handler(), sd_bus_get_current_message(),
sd_bus_get_current_slot() and sd_bus_get_current_userdata(),
respectively. If bus cannot be resolved or if execution does not
reside in a user-supplied callback of bus, these functions return
NULL.
On success, these functions return the requested object. On
failure, they return 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.
All functions listed here are thread-agnostic and only a single
thread may operate on a given object at any given time. Different
threads may access the same object at different times. Multiple
independent objects may be used from different threads in
parallel.
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_get_current_handler(), sd_bus_get_current_message(),
sd_bus_get_current_slot(), and sd_bus_get_current_userdata() were
added in version 221.
systemd(1), sd-bus(3)
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 2026-08-04. (At that
time, the date of the most recent commit that was found in the
repository was 2026-08-03.) 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 262~devel SD_BUS_G..._HANDLER(3)
Pages that refer to this page: sd-bus(3), systemd.directives(7), systemd.index(7)
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HTML rendering created 2026-09-09 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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