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47 lines
1.6 KiB
C
47 lines
1.6 KiB
C
// SPDX-License-Identifier: Apache-2.0
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#pragma once
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#include "instance.h"
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#include <stdbool.h>
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#include <tactility/error.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* Sends a POSIX signal to an app instance. A signal's pid is its AppInstanceId.
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*
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* An app with an event subscription (app/event.h) receives the signal as an AppEvent: SIGTERM as
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* APP_EVENT_CLOSE, any other signal as APP_EVENT_SIGNAL. Its signal() handlers are not used.
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*
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* Any other app gets the signal queued, and delivered on its own task at its next libc call (see
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* app_signal_deliver_pending()). A blocking read, write, poll or sleep it is waiting in returns -1
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* with errno EINTR within about 100 ms.
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* A signal the app ignores is discarded right away.
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*
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* @param[in] sig 1 to APP_LIBC_SIGNAL_COUNT - 1 (app/libc.h)
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* @retval ERROR_NONE the signal was sent or discarded
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* @retval ERROR_INVALID_ARGUMENT @a sig is out of range
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* @retval ERROR_NOT_FOUND no such app instance
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* @retval ERROR_RESOURCE an event queue of the app was full
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*/
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error_t app_signal_send(AppInstanceId app_instance_id, int sig);
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/** @return true when the calling app instance has a signal that was not yet delivered */
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bool app_signal_is_pending(void);
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/**
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* Delivers the calling app instance's pending signals: calls signal() handlers, and ends the app
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* (as exit(128 + sig)) for a signal without a handler whose default action terminates.
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* Does nothing outside an app task.
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* @warning Only call where the app holds no lock of the system itself, e.g. at the entry of a libc wrap.
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*/
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void app_signal_deliver_pending(void);
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#ifdef __cplusplus
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}
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#endif
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