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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.
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 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_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 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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