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files >> //usr/include/systemd/sd-event.h
/* SPDX-License-Identifier: LGPL-2.1+ */ #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 <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 and child PIDs */ _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 || _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 void (*sd_event_destroy_t)(void *userdata); 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_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_inotify_fd(sd_event *e, sd_event_source **s, int fd, 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_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_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); int sd_event_source_set_ratelimit_expire_callback(sd_event_source *s, sd_event_handler_t callback); /* 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_END_DECLARATIONS; #endif
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