SD_EVENT_SOURCE_SET_DESCsd_event_source_set_SD_EVENT_SOURCE_SET_DESCRIPTION(3)

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

SYNOPSIS
       #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
       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
       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
       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_userdata(3)

systemd 252                                 SD_EVENT_SOURCE_SET_DESCRIPTION(3)

Czas wygenerowania: 0.00025 sek.

Created with the man page lookup class by Andrew Collington.
Based on a C man page viewer by Vadim Pavlov
Unicode soft-hyphen fix (as used by RedHat) by Dan Edwards
Some optimisations by Eli Argon
Caching idea and code contribution by James Richardson

Copyright © 2003-2025 Linux.pl
Hosted by Hosting Linux.pl