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 #ifdef USE_KQUEUE
  48 #define ULOOP_EDGE_DEFER        (1 << 4)
  49 #endif
  50
  51 struct uloop_fd
  52 {
  53         uloop_fd_handler cb;
  54         int fd;
  55         bool eof;
  56         bool error;
  57         bool registered;
  58         uint8_t flags;
  59 };
  60
  61 struct uloop_timeout
  62 {
  63         struct list_head list;
  64         bool pending;
  65
  66         uloop_timeout_handler cb;
  67         struct timeval time;
  68 };
  69
  70 struct uloop_process
  71 {
  72         struct list_head list;
  73         bool pending;
  74
  75         uloop_process_handler cb;
  76         pid_t pid;
  77 };
  78
  79 extern bool uloop_cancelled;
  80 extern bool uloop_handle_sigchld;
  81
  82 int uloop_fd_add(struct uloop_fd *sock, unsigned int flags);
  83 int uloop_fd_delete(struct uloop_fd *sock);
  84
  85 int uloop_timeout_add(struct uloop_timeout *timeout);
  86 int uloop_timeout_set(struct uloop_timeout *timeout, int msecs);
  87 int uloop_timeout_cancel(struct uloop_timeout *timeout);
  88 int uloop_timeout_remaining(struct uloop_timeout *timeout);
  89
  90 int uloop_process_add(struct uloop_process *p);
  91 int uloop_process_delete(struct uloop_process *p);
  92
  93 static inline void uloop_end(void)
  94 {
  95         uloop_cancelled = true;
  96 }
  97
  98 int uloop_init(void);
  99 void uloop_run(void);
 100 void uloop_done(void);
 101
 102 #endif