1 /* SPDX-License-Identifier: BSD-2-Clause */ 2 /* 3 * dhcpcd - DHCP client daemon 4 * Copyright (c) 2006-2019 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 /* Some systems don't define timespec macros */ 35 #ifndef timespecclear 36 #define timespecclear(tsp) (tsp)->tv_sec = (time_t)((tsp)->tv_nsec = 0L) 37 #define timespecisset(tsp) ((tsp)->tv_sec || (tsp)->tv_nsec) 38 #define timespeccmp(tsp, usp, cmp) \ 39 (((tsp)->tv_sec == (usp)->tv_sec) ? \ 40 ((tsp)->tv_nsec cmp (usp)->tv_nsec) : \ 41 ((tsp)->tv_sec cmp (usp)->tv_sec)) 42 #define timespecadd(tsp, usp, vsp) \ 43 do { \ 44 (vsp)->tv_sec = (tsp)->tv_sec + (usp)->tv_sec; \ 45 (vsp)->tv_nsec = (tsp)->tv_nsec + (usp)->tv_nsec; \ 46 if ((vsp)->tv_nsec >= 1000000000L) { \ 47 (vsp)->tv_sec++; \ 48 (vsp)->tv_nsec -= 1000000000L; \ 49 } \ 50 } while (/* CONSTCOND */ 0) 51 #define timespecsub(tsp, usp, vsp) \ 52 do { \ 53 (vsp)->tv_sec = (tsp)->tv_sec - (usp)->tv_sec; \ 54 (vsp)->tv_nsec = (tsp)->tv_nsec - (usp)->tv_nsec; \ 55 if ((vsp)->tv_nsec < 0) { \ 56 (vsp)->tv_sec--; \ 57 (vsp)->tv_nsec += 1000000000L; \ 58 } \ 59 } while (/* CONSTCOND */ 0) 60 #endif 61 62 /* eloop queues are really only for deleting timeouts registered 63 * for a function or object. 64 * The idea being that one interface has different timeouts for 65 * say DHCP and DHCPv6. */ 66 #ifndef ELOOP_QUEUE 67 #define ELOOP_QUEUE 1 68 #endif 69 70 /* Forward declare eloop - the content should be invisible to the outside */ 71 struct eloop; 72 73 int eloop_event_add_rw(struct eloop *, int, 74 void (*)(void *), void *, 75 void (*)(void *), void *); 76 int eloop_event_add(struct eloop *, int, 77 void (*)(void *), void *); 78 int eloop_event_add_w(struct eloop *, int, 79 void (*)(void *), void *); 80 #define eloop_event_delete(eloop, fd) \ 81 eloop_event_delete_write((eloop), (fd), 0) 82 #define eloop_event_remove_writecb(eloop, fd) \ 83 eloop_event_delete_write((eloop), (fd), 1) 84 int eloop_event_delete_write(struct eloop *, int, int); 85 86 #define eloop_timeout_add_tv(eloop, tv, cb, ctx) \ 87 eloop_q_timeout_add_tv((eloop), ELOOP_QUEUE, (tv), (cb), (ctx)) 88 #define eloop_timeout_add_sec(eloop, tv, cb, ctx) \ 89 eloop_q_timeout_add_sec((eloop), ELOOP_QUEUE, (tv), (cb), (ctx)) 90 #define eloop_timeout_add_msec(eloop, ms, cb, ctx) \ 91 eloop_q_timeout_add_msec((eloop), ELOOP_QUEUE, (ms), (cb), (ctx)) 92 #define eloop_timeout_delete(eloop, cb, ctx) \ 93 eloop_q_timeout_delete((eloop), ELOOP_QUEUE, (cb), (ctx)) 94 int eloop_q_timeout_add_tv(struct eloop *, int, 95 const struct timespec *, void (*)(void *), void *); 96 int eloop_q_timeout_add_sec(struct eloop *, int, 97 time_t, void (*)(void *), void *); 98 int eloop_q_timeout_add_msec(struct eloop *, int, 99 long, void (*)(void *), void *); 100 int eloop_q_timeout_delete(struct eloop *, int, void (*)(void *), void *); 101 102 int eloop_signal_set_cb(struct eloop *, const int *, size_t, 103 void (*)(int, void *), void *); 104 int eloop_signal_mask(struct eloop *, sigset_t *oldset); 105 106 struct eloop * eloop_new(void); 107 int eloop_requeue(struct eloop *); 108 void eloop_free(struct eloop *); 109 void eloop_exit(struct eloop *, int); 110 int eloop_start(struct eloop *, sigset_t *); 111 112 #endif 113