uloop.h

   1 /*
   2  * uloop - event loop implementation
   3  *
   4  * Copyright (C) 2010-2013 Felix Fietkau <nbd@openwrt.org>
   5  *
   6  * Permission to use, copy, modify, and/or distribute this software for any
   7  * purpose with or without fee is hereby granted, provided that the above
   8  * copyright notice and this permission notice appear in all copies.
   9  *
  10  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  11  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  12  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  13  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  14  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  15  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  16  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  17  */
  18 #ifndef _ULOOP_H__
  19 #define _ULOOP_H__
  20
  21 #include <sys/time.h>
  22 #include <sys/types.h>
  23 #include <stdbool.h>
  24 #include <stdint.h>
  25 #include <signal.h>
  26
  27 #if defined(__APPLE__) || defined(__FreeBSD__)
  28 #define USE_KQUEUE
  29 #else
  30 #define USE_EPOLL
  31 #endif
  32
  33 #include "list.h"
  34
  35 struct uloop_fd;
  36 struct uloop_timeout;
  37 struct uloop_process;
  38
  39 typedef void (*uloop_fd_handler)(struct uloop_fd *u, unsigned int events);
  40 typedef void (*uloop_timeout_handler)(struct uloop_timeout *t);
  41 typedef void (*uloop_process_handler)(struct uloop_process *c, int ret);
  42
  43 #define ULOOP_READ              (1 << 0)
  44 #define ULOOP_WRITE             (1 << 1)
  45 #define ULOOP_EDGE_TRIGGER      (1 << 2)
  46 #define ULOOP_BLOCKING          (1 << 3)
  47
  48 #define ULOOP_EVENT_MASK        (ULOOP_READ | ULOOP_WRITE)
  49
  50 /* internal flags */
  51 #define ULOOP_EVENT_BUFFERED    (1 << 4)
  52 #ifdef USE_KQUEUE
  53 #define ULOOP_EDGE_DEFER        (1 << 5)
  54 #endif
  55
  56 struct uloop_fd
  57 {
  58         uloop_fd_handler cb;
  59         int fd;
  60         bool eof;
  61         bool error;
  62         bool registered;
  63         uint8_t flags;
  64 };
  65
  66 struct uloop_timeout
  67 {
  68         struct list_head list;
  69         bool pending;
  70
  71         uloop_timeout_handler cb;
  72         struct timeval time;
  73 };
  74
  75 struct uloop_process
  76 {
  77         struct list_head list;
  78         bool pending;
  79
  80         uloop_process_handler cb;
  81         pid_t pid;
  82 };
  83
  84 extern bool uloop_cancelled;
  85 extern bool uloop_handle_sigchld;
  86
  87 int uloop_fd_add(struct uloop_fd *sock, unsigned int flags);
  88 int uloop_fd_delete(struct uloop_fd *sock);
  89
  90 int uloop_timeout_add(struct uloop_timeout *timeout);
  91 int uloop_timeout_set(struct uloop_timeout *timeout, int msecs);
  92 int uloop_timeout_cancel(struct uloop_timeout *timeout);
  93 int uloop_timeout_remaining(struct uloop_timeout *timeout);
  94
  95 int uloop_process_add(struct uloop_process *p);
  96 int uloop_process_delete(struct uloop_process *p);
  97
  98 static inline void uloop_end(void)
  99 {
 100         uloop_cancelled = true;
 101 }
 102
 103 int uloop_init(void);
 104 void uloop_run(void);
 105 void uloop_done(void);
 106
 107 #endif