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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | NOTES | SEE ALSO | COLOPHON |
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SD_EVENT_SOURCE_SET_USERDATA(3)source_set_userdataSOURCE_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_signal(3), sd_event_add_child(3),
sd_event_add_inotify(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 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 2020-12-18. (At that
time, the date of the most recent commit that was found in the
repository was 2020-12-18.) 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 247 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_inotify(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_destroy_callback(3), sd_event_source_set_prepare(3), systemd.directives(7), systemd.index(7)
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