1 /* SPDX-License-Identifier: BSD-2-Clause */ 2 /* 3 * dhcpcd - DHCP client daemon 4 * Copyright (c) 2006-2023 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 #define ELE_READ 0x0001 56 #define ELE_WRITE 0x0002 57 #define ELE_ERROR 0x0100 58 #define ELE_HANGUP 0x0200 59 #define ELE_NVAL 0x0400 60 61 size_t eloop_event_count(const struct eloop *); 62 int eloop_event_add(struct eloop *, int, unsigned short, 63 void (*)(void *, unsigned short), void *); 64 int eloop_event_delete(struct eloop *, int); 65 66 unsigned long long eloop_timespec_diff(const struct timespec *tsp, 67 const struct timespec *usp, unsigned int *nsp); 68 #define eloop_timeout_add_tv(eloop, tv, cb, ctx) \ 69 eloop_q_timeout_add_tv((eloop), ELOOP_QUEUE, (tv), (cb), (ctx)) 70 #define eloop_timeout_add_sec(eloop, tv, cb, ctx) \ 71 eloop_q_timeout_add_sec((eloop), ELOOP_QUEUE, (tv), (cb), (ctx)) 72 #define eloop_timeout_add_msec(eloop, ms, cb, ctx) \ 73 eloop_q_timeout_add_msec((eloop), ELOOP_QUEUE, (ms), (cb), (ctx)) 74 #define eloop_timeout_delete(eloop, cb, ctx) \ 75 eloop_q_timeout_delete((eloop), ELOOP_QUEUE, (cb), (ctx)) 76 int eloop_q_timeout_add_tv(struct eloop *, int, 77 const struct timespec *, void (*)(void *), void *); 78 int eloop_q_timeout_add_sec(struct eloop *, int, 79 unsigned int, void (*)(void *), void *); 80 int eloop_q_timeout_add_msec(struct eloop *, int, 81 unsigned long, void (*)(void *), void *); 82 int eloop_q_timeout_delete(struct eloop *, int, void (*)(void *), void *); 83 84 int eloop_signal_set_cb(struct eloop *, const int *, size_t, 85 void (*)(int, void *), void *); 86 int eloop_signal_mask(struct eloop *, sigset_t *oldset); 87 88 struct eloop * eloop_new(void); 89 void eloop_clear(struct eloop *, ...); 90 void eloop_free(struct eloop *); 91 void eloop_exit(struct eloop *, int); 92 void eloop_enter(struct eloop *); 93 int eloop_forked(struct eloop *); 94 int eloop_open(struct eloop *); 95 int eloop_start(struct eloop *, sigset_t *); 96 97 #endif 98