установка или получение функции выхода при сбое источников событий (Set or retrieve the exit-on-failure feature of event sources)
Имя (Name)
sd_event_source_set_exit_on_failure,
sd_event_source_get_exit_on_failure - Set or retrieve the
exit-on-failure feature of event sources
Синопсис (Synopsis)
#include <systemd/sd-event.h>
int sd_event_source_set_exit_on_failure(sd_event_source *source,
int b);
int sd_event_source_get_exit_on_failure(sd_event_source *source);
Описание (Description)
sd_event_source_set_exit_on_failure() may be used to set/unset
the exit-on-failure flag of the event source object specified as
source. The flag defaults to off. If on and the callback function
set for the event source returns a failure code (i.e. a negative
value) the event loop is exited too, using the callback return
code as the exit code for sd_event_exit(3). If off, the event
source is disabled but the event loop continues to run. Setting
this flag is useful for "dominant" event sources that define the
purpose and reason for the event loop, and whose failure hence
should propagate to the event loop itself — as opposed to
"auxiliary" event sources whose failures should remain local and
affect the event source, but not propagate further.
sd_event_source_get_exit_on_failure() may be used to query the
flag currently set for the event source object source.
Возвращаемое значение (Return value)
On success, sd_event_source_set_exit_on_failure() returns a
non-negative integer. sd_event_source_get_exit_on_failure()
returns 0 if the flag is off, > 0 if the flag is on. On failure,
both 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.
-EDOM
The event source refers to an exit event source (as created
with sd_event_add_exit(3)), for which this functionality is
not supported.
Примечание (Note)
These APIs are implemented as a shared library, which can be
compiled and linked to with the libsystemd pkg-config(1) file.
Смотри также (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)
