1 /* 2 * dhcpcd - DHCP client daemon 3 * Copyright (c) 2006-2018 Roy Marples <roy@marples.name> 4 * All rights reserved 5 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 #ifndef ELOOP_H 29 #define ELOOP_H 30 31 #include <time.h> 32 33 /* Some systems don't define timespec macros */ 34 #ifndef timespecclear 35 #define timespecclear(tsp) (tsp)->tv_sec = (time_t)((tsp)->tv_nsec = 0L) 36 #define timespecisset(tsp) ((tsp)->tv_sec || (tsp)->tv_nsec) 37 #define timespeccmp(tsp, usp, cmp) \ 38 (((tsp)->tv_sec == (usp)->tv_sec) ? \ 39 ((tsp)->tv_nsec cmp (usp)->tv_nsec) : \ 40 ((tsp)->tv_sec cmp (usp)->tv_sec)) 41 #define timespecadd(tsp, usp, vsp) \ 42 do { \ 43 (vsp)->tv_sec = (tsp)->tv_sec + (usp)->tv_sec; \ 44 (vsp)->tv_nsec = (tsp)->tv_nsec + (usp)->tv_nsec; \ 45 if ((vsp)->tv_nsec >= 1000000000L) { \ 46 (vsp)->tv_sec++; \ 47 (vsp)->tv_nsec -= 1000000000L; \ 48 } \ 49 } while (/* CONSTCOND */ 0) 50 #define timespecsub(tsp, usp, vsp) \ 51 do { \ 52 (vsp)->tv_sec = (tsp)->tv_sec - (usp)->tv_sec; \ 53 (vsp)->tv_nsec = (tsp)->tv_nsec - (usp)->tv_nsec; \ 54 if ((vsp)->tv_nsec < 0) { \ 55 (vsp)->tv_sec--; \ 56 (vsp)->tv_nsec += 1000000000L; \ 57 } \ 58 } while (/* CONSTCOND */ 0) 59 #endif 60 61 /* eloop queues are really only for deleting timeouts registered 62 * for a function or object. 63 * The idea being that one interface has different timeouts for 64 * say DHCP and DHCPv6. */ 65 #ifndef ELOOP_QUEUE 66 #define ELOOP_QUEUE 1 67 #endif 68 69 /* Forward declare eloop - the content should be invisible to the outside */ 70 struct eloop; 71 72 int eloop_event_add_rw(struct eloop *, int, 73 void (*)(void *), void *, 74 void (*)(void *), void *); 75 int eloop_event_add(struct eloop *, int, 76 void (*)(void *), void *); 77 int eloop_event_add_w(struct eloop *, int, 78 void (*)(void *), void *); 79 #define eloop_event_delete(eloop, fd) \ 80 eloop_event_delete_write((eloop), (fd), 0) 81 #define eloop_event_remove_writecb(eloop, fd) \ 82 eloop_event_delete_write((eloop), (fd), 1) 83 int eloop_event_delete_write(struct eloop *, int, int); 84 85 #define eloop_timeout_add_tv(eloop, tv, cb, ctx) \ 86 eloop_q_timeout_add_tv((eloop), ELOOP_QUEUE, (tv), (cb), (ctx)) 87 #define eloop_timeout_add_sec(eloop, tv, cb, ctx) \ 88 eloop_q_timeout_add_sec((eloop), ELOOP_QUEUE, (tv), (cb), (ctx)) 89 #define eloop_timeout_add_msec(eloop, ms, cb, ctx) \ 90 eloop_q_timeout_add_msec((eloop), ELOOP_QUEUE, (ms), (cb), (ctx)) 91 #define eloop_timeout_delete(eloop, cb, ctx) \ 92 eloop_q_timeout_delete((eloop), ELOOP_QUEUE, (cb), (ctx)) 93 int eloop_q_timeout_add_tv(struct eloop *, int, 94 const struct timespec *, void (*)(void *), void *); 95 int eloop_q_timeout_add_sec(struct eloop *, int, 96 time_t, void (*)(void *), void *); 97 int eloop_q_timeout_add_msec(struct eloop *, int, 98 long, void (*)(void *), void *); 99 int eloop_q_timeout_delete(struct eloop *, int, void (*)(void *), void *); 100 101 int eloop_signal_set_cb(struct eloop *, const int *, size_t, 102 void (*)(int, void *), void *); 103 int eloop_signal_mask(struct eloop *, sigset_t *oldset); 104 105 struct eloop * eloop_new(void); 106 int eloop_requeue(struct eloop *); 107 void eloop_free(struct eloop *); 108 void eloop_exit(struct eloop *, int); 109 int eloop_start(struct eloop *, sigset_t *); 110 111 #endif 112