/* SPDX-License-Identifier: LGPL-2.1-or-later */

#ifndef foosdeventhfoo

#define foosdeventhfoo

/***

  systemd is free software; you can redistribute it and/or modify it

  under the terms of the GNU Lesser General Public License as published by

  the Free Software Foundation; either version 2.1 of the License, or

  (at your option) any later version.

  systemd is distributed in the hope that it will be useful, but

  WITHOUT ANY WARRANTY; without even the implied warranty of

  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

  Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public License

  along with systemd; If not, see <http://www.gnu.org/licenses/>.

***/

#include <inttypes.h>

#include <signal.h>

#include <sys/epoll.h>

#include <sys/inotify.h>

#include <sys/signalfd.h>

#include <sys/types.h>

#include <sys/wait.h>

#include <time.h>

#include "_sd-common.h"

/*

  Why is this better than pure epoll?

  - Supports event source prioritization

  - Scales better with a large number of time events because it does not require one timerfd each

  - Automatically tries to coalesce timer events system-wide

  - Handles signals, child PIDs, inotify events

  - Supports systemd-style automatic watchdog event generation

*/

_SD_BEGIN_DECLARATIONS;

#define SD_EVENT_DEFAULT ((sd_event *) 1)

typedef struct sd_event sd_event;

typedef struct sd_event_source sd_event_source;

enum {

        SD_EVENT_OFF = 0,

        SD_EVENT_ON = 1,

        SD_EVENT_ONESHOT = -1

};

enum {

        SD_EVENT_INITIAL,

        SD_EVENT_ARMED,

        SD_EVENT_PENDING,

        SD_EVENT_RUNNING,

        SD_EVENT_EXITING,

        SD_EVENT_FINISHED,

        SD_EVENT_PREPARING

};

enum {

        /* And everything in-between and outside is good too */

        SD_EVENT_PRIORITY_IMPORTANT = -100,

        SD_EVENT_PRIORITY_NORMAL = 0,

        SD_EVENT_PRIORITY_IDLE = 100

};

typedef int (*sd_event_handler_t)(sd_event_source *s, void *userdata);

typedef int (*sd_event_io_handler_t)(sd_event_source *s, int fd, uint32_t revents, void *userdata);

typedef int (*sd_event_time_handler_t)(sd_event_source *s, uint64_t usec, void *userdata);

typedef int (*sd_event_signal_handler_t)(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata);

#if defined _GNU_SOURCE || (defined _POSIX_C_SOURCE && _POSIX_C_SOURCE >= 199309L)

typedef int (*sd_event_child_handler_t)(sd_event_source *s, const siginfo_t *si, void *userdata);

#else

typedef void* sd_event_child_handler_t;

#endif

typedef int (*sd_event_inotify_handler_t)(sd_event_source *s, const struct inotify_event *event, void *userdata);

typedef _sd_destroy_t sd_event_destroy_t;

int sd_event_default(sd_event **e);

int sd_event_new(sd_event **e);

sd_event* sd_event_ref(sd_event *e);

sd_event* sd_event_unref(sd_event *e);

int sd_event_add_io(sd_event *e, sd_event_source **s, int fd, uint32_t events, sd_event_io_handler_t callback, void *userdata);

int sd_event_add_time(sd_event *e, sd_event_source **s, clockid_t clock, uint64_t usec, uint64_t accuracy, sd_event_time_handler_t callback, void *userdata);

int sd_event_add_time_relative(sd_event *e, sd_event_source **s, clockid_t clock, uint64_t usec, uint64_t accuracy, sd_event_time_handler_t callback, void *userdata);

int sd_event_add_signal(sd_event *e, sd_event_source **s, int sig, sd_event_signal_handler_t callback, void *userdata);

int sd_event_add_child(sd_event *e, sd_event_source **s, pid_t pid, int options, sd_event_child_handler_t callback, void *userdata);

int sd_event_add_child_pidfd(sd_event *e, sd_event_source **s, int pidfd, int options, sd_event_child_handler_t callback, void *userdata);

int sd_event_add_inotify(sd_event *e, sd_event_source **s, const char *path, uint32_t mask, sd_event_inotify_handler_t callback, void *userdata);

int sd_event_add_defer(sd_event *e, sd_event_source **s, sd_event_handler_t callback, void *userdata);

int sd_event_add_post(sd_event *e, sd_event_source **s, sd_event_handler_t callback, void *userdata);

int sd_event_add_exit(sd_event *e, sd_event_source **s, sd_event_handler_t callback, void *userdata);

int sd_event_prepare(sd_event *e);

int sd_event_wait(sd_event *e, uint64_t usec);

int sd_event_dispatch(sd_event *e);

int sd_event_run(sd_event *e, uint64_t usec);

int sd_event_loop(sd_event *e);

int sd_event_exit(sd_event *e, int code);

int sd_event_now(sd_event *e, clockid_t clock, uint64_t *usec);

int sd_event_get_fd(sd_event *e);

int sd_event_get_state(sd_event *e);

int sd_event_get_tid(sd_event *e, pid_t *tid);

int sd_event_get_exit_code(sd_event *e, int *code);

int sd_event_set_watchdog(sd_event *e, int b);

int sd_event_get_watchdog(sd_event *e);

int sd_event_get_iteration(sd_event *e, uint64_t *ret);

sd_event_source* sd_event_source_ref(sd_event_source *s);

sd_event_source* sd_event_source_unref(sd_event_source *s);

sd_event_source* sd_event_source_disable_unref(sd_event_source *s);

sd_event *sd_event_source_get_event(sd_event_source *s);

void* sd_event_source_get_userdata(sd_event_source *s);

void* sd_event_source_set_userdata(sd_event_source *s, void *userdata);

int sd_event_source_set_description(sd_event_source *s, const char *description);

int sd_event_source_get_description(sd_event_source *s, const char **description);

int sd_event_source_set_prepare(sd_event_source *s, sd_event_handler_t callback);

int sd_event_source_get_pending(sd_event_source *s);

int sd_event_source_get_priority(sd_event_source *s, int64_t *priority);

int sd_event_source_set_priority(sd_event_source *s, int64_t priority);

int sd_event_source_get_enabled(sd_event_source *s, int *enabled);

int sd_event_source_set_enabled(sd_event_source *s, int enabled);

int sd_event_source_get_io_fd(sd_event_source *s);

int sd_event_source_set_io_fd(sd_event_source *s, int fd);

int sd_event_source_get_io_fd_own(sd_event_source *s);

int sd_event_source_set_io_fd_own(sd_event_source *s, int own);

int sd_event_source_get_io_events(sd_event_source *s, uint32_t* events);

int sd_event_source_set_io_events(sd_event_source *s, uint32_t events);

int sd_event_source_get_io_revents(sd_event_source *s, uint32_t* revents);

int sd_event_source_get_time(sd_event_source *s, uint64_t *usec);

int sd_event_source_set_time(sd_event_source *s, uint64_t usec);

int sd_event_source_set_time_relative(sd_event_source *s, uint64_t usec);

int sd_event_source_get_time_accuracy(sd_event_source *s, uint64_t *usec);

int sd_event_source_set_time_accuracy(sd_event_source *s, uint64_t usec);

int sd_event_source_get_time_clock(sd_event_source *s, clockid_t *clock);

int sd_event_source_get_signal(sd_event_source *s);

int sd_event_source_get_child_pid(sd_event_source *s, pid_t *pid);

int sd_event_source_get_child_pidfd(sd_event_source *s);

int sd_event_source_get_child_pidfd_own(sd_event_source *s);

int sd_event_source_set_child_pidfd_own(sd_event_source *s, int own);

int sd_event_source_get_child_process_own(sd_event_source *s);

int sd_event_source_set_child_process_own(sd_event_source *s, int own);

#if defined _GNU_SOURCE || (defined _POSIX_C_SOURCE && _POSIX_C_SOURCE >= 199309L)

int sd_event_source_send_child_signal(sd_event_source *s, int sig, const siginfo_t *si, unsigned flags);

#else

int sd_event_source_send_child_signal(sd_event_source *s, int sig, const void *si, unsigned flags);

#endif

int sd_event_source_get_inotify_mask(sd_event_source *s, uint32_t *ret);

int sd_event_source_set_destroy_callback(sd_event_source *s, sd_event_destroy_t callback);

int sd_event_source_get_destroy_callback(sd_event_source *s, sd_event_destroy_t *ret);

int sd_event_source_get_floating(sd_event_source *s);

int sd_event_source_set_floating(sd_event_source *s, int b);

int sd_event_source_get_exit_on_failure(sd_event_source *s);

int sd_event_source_set_exit_on_failure(sd_event_source *s, int b);

int sd_event_source_set_ratelimit(sd_event_source *s, uint64_t interval_usec, unsigned burst);

int sd_event_source_get_ratelimit(sd_event_source *s, uint64_t *ret_interval_usec, unsigned *ret_burst);

int sd_event_source_is_ratelimited(sd_event_source *s);

/* Define helpers so that __attribute__((cleanup(sd_event_unrefp))) and similar may be used. */

_SD_DEFINE_POINTER_CLEANUP_FUNC(sd_event, sd_event_unref);

_SD_DEFINE_POINTER_CLEANUP_FUNC(sd_event_source, sd_event_source_unref);

_SD_DEFINE_POINTER_CLEANUP_FUNC(sd_event_source, sd_event_source_disable_unref);

_SD_END_DECLARATIONS;

#endif