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.

           Added in version 247.

       -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.

           Added in version 247.

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.

HISTORY

       sd_event_source_set_exit_on_failure() and sd_event_source_get_exit_on_failure() were added
       in version 247.

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)