SD_EVENT_SOURCE_SET_USERDATA - Online Linux Manual PageSection : 3
Updated :
Source : systemd 250
Note : sd_event_source_set_userdata

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NAMEsd_event_source_set_userdata, sd_event_source_get_userdata − Set or retrieve user data pointer of event sources

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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);

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DESCRIPTIONsd_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​.

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RETURN VALUEOn success, sd_event_source_set_userdata() and sd_event_source_get_userdata() return the previously set user data pointer​. On failure, they return NULL​.

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

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SEE ALSOsd-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) 0

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