1SD_EVENT_EXIT(3) sd_event_exit SD_EVENT_EXIT(3)
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6 sd_event_exit, sd_event_get_exit_code - Ask the event loop to exit
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9 #include <systemd/sd-event.h>
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11 int sd_event_exit(sd_event *event, int code);
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13 int sd_event_get_exit_code(sd_event *event, int *code);
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16 sd_event_exit() requests the event loop specified in the event event
17 loop object to exit. The code parameter may be any integer value and is
18 returned as-is by sd_event_loop(3) after the last event loop iteration.
19 It may also be queried using sd_event_get_exit_code(), see below.
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21 When exiting is requested the event loop will stop listening for and
22 dispatching regular event sources. Instead it will proceed with
23 executing only event sources registered with sd_event_add_exit(3) in
24 the order defined by their priority. After all exit event sources have
25 been dispatched the event loop is terminated.
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27 If sd_event_exit() is invoked a second time while the event loop is
28 still processing exit event sources, the exit code stored in the event
29 loop object is updated, but otherwise no further operation is executed.
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31 sd_event_get_exit_code() may be used to query the exit code passed into
32 sd_event_exit() earlier.
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34 While the full positive and negative integer ranges may be used for the
35 exit code, care should be taken not pick exit codes that conflict with
36 regular exit codes returned by sd_event_loop(), if these exit codes
37 shall be distinguishable.
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39 Note that for most event source types passing the callback pointer as
40 NULL in the respective constructor call (i.e. in sd_event_add_time(3),
41 sd_event_add_signal(3), ...) has the effect of sd_event_exit() being
42 invoked once the event source triggers, with the specified userdata
43 pointer cast to an integer as the exit code parameter. This is useful
44 to automatically terminate an event loop after some condition, such as
45 a time-out or reception of SIGTERM or similar. See the documentation
46 for the respective constructor call for details.
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49 On success, sd_event_exit() and sd_event_get_exit_code() return 0 or a
50 positive integer. On failure, they return a negative errno-style error
51 code.
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53 Errors
54 Returned errors may indicate the following problems:
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56 -EINVAL
57 The event loop object or error code pointer are invalid.
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59 -ECHILD
60 The event loop was created in a different process.
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62 -ESTALE
63 The event loop has exited already and all exit handlers are already
64 processed.
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66 -ENODATA
67 The event loop has not been requested to exit yet.
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70 These APIs are implemented as a shared library, which can be compiled
71 and linked to with the libsystemd pkg-config(1) file.
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74 systemd(1), sd-event(3), sd_event_new(3), sd_event_add_exit(3),
75 sd_event_add_time(3), sd_event_add_signal(3), sd_event_add_io(3),
76 sd_event_add_defer(3), sd_event_add_inotify(3)
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80systemd 253 SD_EVENT_EXIT(3)