1 /* SPDX-License-Identifier: BSD-2-Clause */ 2 /* 3 * dhcpcd - DHCP client daemon 4 * Copyright (c) 2006-2021 Roy Marples <roy@marples.name> 5 * All rights reserved 6 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #ifndef ELOOP_H 30 #define ELOOP_H 31 32 #include <time.h> 33 34 /* Handy macros to create subsecond timeouts */ 35 #define CSEC_PER_SEC 100 36 #define MSEC_PER_SEC 1000 37 #define NSEC_PER_CSEC 10000000 38 #define NSEC_PER_MSEC 1000000 39 #define NSEC_PER_SEC 1000000000 40 41 /* eloop queues are really only for deleting timeouts registered 42 * for a function or object. 43 * The idea being that one interface has different timeouts for 44 * say DHCP and DHCPv6. */ 45 #ifndef ELOOP_QUEUE 46 #define ELOOP_QUEUE 1 47 #endif 48 49 /* Used for deleting a timeout for all queues. */ 50 #define ELOOP_QUEUE_ALL 0 51 52 /* Forward declare eloop - the content should be invisible to the outside */ 53 struct eloop; 54 55 unsigned long long eloop_timespec_diff(const struct timespec *tsp, 56 const struct timespec *usp, unsigned int *nsp); 57 size_t eloop_event_count(const struct eloop *); 58 int eloop_event_add_rw(struct eloop *, int, 59 void (*)(void *), void *, 60 void (*)(void *), void *); 61 int eloop_event_add(struct eloop *, int, 62 void (*)(void *), void *); 63 int eloop_event_add_w(struct eloop *, int, 64 void (*)(void *), void *); 65 #define eloop_event_delete(eloop, fd) \ 66 eloop_event_delete_write((eloop), (fd), 0) 67 #define eloop_event_remove_writecb(eloop, fd) \ 68 eloop_event_delete_write((eloop), (fd), 1) 69 int eloop_event_delete_write(struct eloop *, int, int); 70 71 #define eloop_timeout_add_tv(eloop, tv, cb, ctx) \ 72 eloop_q_timeout_add_tv((eloop), ELOOP_QUEUE, (tv), (cb), (ctx)) 73 #define eloop_timeout_add_sec(eloop, tv, cb, ctx) \ 74 eloop_q_timeout_add_sec((eloop), ELOOP_QUEUE, (tv), (cb), (ctx)) 75 #define eloop_timeout_add_msec(eloop, ms, cb, ctx) \ 76 eloop_q_timeout_add_msec((eloop), ELOOP_QUEUE, (ms), (cb), (ctx)) 77 #define eloop_timeout_delete(eloop, cb, ctx) \ 78 eloop_q_timeout_delete((eloop), ELOOP_QUEUE, (cb), (ctx)) 79 int eloop_q_timeout_add_tv(struct eloop *, int, 80 const struct timespec *, void (*)(void *), void *); 81 int eloop_q_timeout_add_sec(struct eloop *, int, 82 unsigned int, void (*)(void *), void *); 83 int eloop_q_timeout_add_msec(struct eloop *, int, 84 unsigned long, void (*)(void *), void *); 85 int eloop_q_timeout_delete(struct eloop *, int, void (*)(void *), void *); 86 87 void eloop_signal_set_cb(struct eloop *, const int *, size_t, 88 void (*)(int, void *), void *); 89 int eloop_signal_mask(struct eloop *, sigset_t *oldset); 90 91 struct eloop * eloop_new(void); 92 void eloop_clear(struct eloop *); 93 void eloop_free(struct eloop *); 94 void eloop_exit(struct eloop *, int); 95 void eloop_enter(struct eloop *); 96 int eloop_start(struct eloop *, sigset_t *); 97 98 #endif 99