sd_event_source_set_description(3) — Linux manual page

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | NOTES | SEE ALSO | COLOPHON

SD_EVENT_SOURCE_SET_DESCRIPTION(3)ce_set_descriptionE_SET_DESCRIPTION(3)

NAME         top

       sd_event_source_set_description, sd_event_source_get_description
       - Set or retrieve descriptive names of event sources

SYNOPSIS         top

       #include <systemd/sd-event.h>

       int sd_event_source_set_description(sd_event_source *source,
                                           const char *description);

       int sd_event_source_get_description(sd_event_source *source,
                                           const char **description);

DESCRIPTION         top

       sd_event_source_set_description() may be used to set an arbitrary
       descriptive name for the event source object specified as source.
       This name will be used in debugging messages generated by
       sd-event(3) for this event source, and may be queried using
       sd_event_source_get_description() for debugging purposes. The
       description parameter shall point to a NUL-terminated string or
       be NULL. In the latter case, the descriptive name will be unset.
       The string is copied internally, hence the description argument
       is not referenced after the function returns.

       sd_event_source_get_description() may be used to query the
       current descriptive name assigned to the event source object
       source. It returns a pointer to the current name in description,
       stored in memory internal to the event source. The memory is
       invalidated when the event source is destroyed or the descriptive
       name is changed.

       Event source objects generally have no description set when they
       are created, except for UNIX signal event sources created with
       sd_event_add_signal(3), whose descriptive name is initialized to
       the signal's C constant name (e.g.  "SIGINT" or "SIGTERM").

RETURN VALUE         top

       On success, sd_event_source_set_description() and
       sd_event_source_get_description() return a non-negative integer.
       On failure, they return a negative errno-style error code.

   Errors
       Returned errors may indicate the following problems:

       -EINVAL
           source is not a valid pointer to an sd_event_source object or
           the description argument for
           sd_event_source_get_description() is NULL.

       -ENOMEM
           Not enough memory to copy the name.

       -ECHILD
           The event loop has been created in a different process.

       -ENXIO
           No name was set for the event source.

NOTES         top

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

SEE ALSO         top

       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_userdata(3)

COLOPHON         top

       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 2021-08-27.  (At that
       time, the date of the most recent commit that was found in the
       repository was 2021-08-27.)  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 249                           SD_EVENT_SOURCE_SET_DESCRIPTION(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_set_floating(3)sd_event_source_set_userdata(3)