|
NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | NOTES | SEE ALSO | COLOPHON |
SD_EVENT_SOURCE_SET_USERDATA(3)t_source_set_userdataT_SOURCE_SET_USERDATA(3)
sd_event_source_set_userdata, sd_event_source_get_userdata - Set or
retrieve user data pointer of event sources
#include <systemd/sd-event.h>
void* sd_event_source_set_userdata(sd_event_source *source,
void *userdata);
void* sd_event_source_get_userdata(sd_event_source *source);
sd_event_source_set_userdata() may be used to set an arbitrary user
data pointer for the event source object specified as source. The
user data pointer is usually specified when creating an event source
object with calls such as sd_event_add_io(3) or sd_event_add_time(3),
and may be updated with this call. The user data pointer is also
passed to all handler callback functions associated with the event
source. The userdata parameter specifies the new user data pointer to
set, the function returns the previous user data pointer. Note that
NULL is a valid user data pointer.
sd_event_source_get_userdata() may be used to query the current user
data pointer assigned to the event source object source.
On success, sd_event_source_set_userdata() and
sd_event_source_get_userdata() return the previously set user data
pointer. On failure, they return NULL.
These APIs are implemented as a shared library, which can be compiled
and linked to with the libsystemd pkg-config(1) file.
sd-event(3), sd_event_add_io(3), sd_event_add_time(3),
sd_event_add_child(3), sd_event_add_signal(3), sd_event_add_defer(3),
sd_event_source_set_description(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
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⟨http://www.freedesktop.org/wiki/Software/systemd/#bugreports⟩. This
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systemd 234 SD_EVENT_SOURCE_SET_USERDATA(3)
Pages that refer to this page: sd-event(3), sd_event_add_child(3), sd_event_add_defer(3), sd_event_add_io(3), sd_event_add_signal(3), sd_event_add_time(3), sd_event_source_get_event(3), sd_event_source_set_description(3), sd_event_source_set_prepare(3), systemd.directives(7), systemd.index(7)