13d9b04fb0
Reuse and extend the existing signal waker pipe mechanism to add user defined signal handling functionality to uloop. This commit introduces two new api functions `uloop_signal_add()` and `uloop_signal_remove()` along with a new structure type `uloop_signal` to allow adding and removing arbitrary signal handlers. Registered signal handlers are maintained in a linked list and matched by their signo member value which allows registering multiple handlers for the same signal numbers. Upon registering a new signal handler, the existing handler is saved in the `uloop_signal` structure. When removing the user defined signal handler, the original behavior is restored. The Lua binding has been updated as well to support the new signal handler mechanism. Signed-off-by: Jo-Philipp Wich <jo@mein.io>
153 lines
3.7 KiB
C
153 lines
3.7 KiB
C
/*
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* uloop - event loop implementation
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*
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* Copyright (C) 2010-2013 Felix Fietkau <nbd@openwrt.org>
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#ifndef _ULOOP_H__
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#define _ULOOP_H__
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#include <sys/time.h>
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#include <sys/types.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include <signal.h>
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#if defined(__APPLE__) || defined(__FreeBSD__)
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#define USE_KQUEUE
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#else
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#define USE_EPOLL
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#endif
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#include "list.h"
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struct uloop_fd;
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struct uloop_timeout;
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struct uloop_process;
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struct uloop_interval;
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struct uloop_signal;
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typedef void (*uloop_fd_handler)(struct uloop_fd *u, unsigned int events);
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typedef void (*uloop_timeout_handler)(struct uloop_timeout *t);
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typedef void (*uloop_process_handler)(struct uloop_process *c, int ret);
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typedef void (*uloop_interval_handler)(struct uloop_interval *t);
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typedef void (*uloop_signal_handler)(struct uloop_signal *s);
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#define ULOOP_READ (1 << 0)
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#define ULOOP_WRITE (1 << 1)
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#define ULOOP_EDGE_TRIGGER (1 << 2)
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#define ULOOP_BLOCKING (1 << 3)
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#define ULOOP_EVENT_MASK (ULOOP_READ | ULOOP_WRITE)
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/* internal flags */
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#define ULOOP_EVENT_BUFFERED (1 << 4)
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#ifdef USE_KQUEUE
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#define ULOOP_EDGE_DEFER (1 << 5)
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#endif
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#define ULOOP_ERROR_CB (1 << 6)
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struct uloop_fd
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{
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uloop_fd_handler cb;
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int fd;
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bool eof;
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bool error;
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bool registered;
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uint8_t flags;
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};
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struct uloop_timeout
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{
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struct list_head list;
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bool pending;
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uloop_timeout_handler cb;
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struct timeval time;
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};
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struct uloop_process
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{
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struct list_head list;
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bool pending;
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uloop_process_handler cb;
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pid_t pid;
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};
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struct uloop_interval
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{
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uloop_interval_handler cb;
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uint64_t expirations;
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union {
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struct uloop_fd ufd;
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struct {
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int64_t fired;
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unsigned int msecs;
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} time;
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} private;
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};
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struct uloop_signal
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{
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struct list_head list;
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struct sigaction orig;
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bool pending;
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uloop_signal_handler cb;
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int signo;
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};
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extern bool uloop_cancelled;
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extern bool uloop_handle_sigchld;
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extern uloop_fd_handler uloop_fd_set_cb;
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int uloop_fd_add(struct uloop_fd *sock, unsigned int flags);
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int uloop_fd_delete(struct uloop_fd *sock);
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int uloop_get_next_timeout(void);
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int uloop_timeout_add(struct uloop_timeout *timeout);
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int uloop_timeout_set(struct uloop_timeout *timeout, int msecs);
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int uloop_timeout_cancel(struct uloop_timeout *timeout);
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int uloop_timeout_remaining(struct uloop_timeout *timeout) __attribute__((deprecated("use uloop_timeout_remaining64")));
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int64_t uloop_timeout_remaining64(struct uloop_timeout *timeout);
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int uloop_process_add(struct uloop_process *p);
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int uloop_process_delete(struct uloop_process *p);
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int uloop_interval_set(struct uloop_interval *timer, unsigned int msecs);
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int uloop_interval_cancel(struct uloop_interval *timer);
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int64_t uloop_interval_remaining(struct uloop_interval *timer);
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int uloop_signal_add(struct uloop_signal *s);
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int uloop_signal_delete(struct uloop_signal *s);
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bool uloop_cancelling(void);
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static inline void uloop_end(void)
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{
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uloop_cancelled = true;
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}
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int uloop_init(void);
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int uloop_run_timeout(int timeout);
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static inline int uloop_run(void)
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{
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return uloop_run_timeout(-1);
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}
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void uloop_done(void);
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#endif
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