x SuSE Linux 13.1-RELEASE x
x SuSE Linux 13.1-RELEASEx
SD_EVENT_SOURCE_SET_EXsd_event_source_seSD_EVENT_SOURCE_SET_EXIT_ON_FAILURE(3)
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
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);
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.
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.
NOTES
Functions described here are available as a shared library, which can
be compiled against and linked to with the libsystemd pkg-config(1)
file.
The code described here uses getenv(3), which is declared to be not
multi-thread-safe. This means that the code calling the functions
described here must not call setenv(3) from a parallel thread. It is
recommended to only do calls to setenv() from an early phase of the
program when no other threads have been started.
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)
systemd 254 SD_EVENT_SOURCE_SET_EXIT_ON_FAILURE(3)
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