SD_EVENT_SOURCE_SET_USERDsd_event_source_set_usSD_EVENT_SOURCE_SET_USERDATA(3)

NAME
       sd_event_source_set_userdata, sd_event_source_get_userdata - Set or
       retrieve user data pointer of event sources

SYNOPSIS
       #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);

DESCRIPTION
       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.

RETURN VALUE
       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.

NOTES
       These APIs are implemented as a shared library, which can be compiled
       and linked to with the libsystemd pkg-config(1) file.

SEE ALSO
       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)

systemd 252                                    SD_EVENT_SOURCE_SET_USERDATA(3)

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