src/ae_kqueue.c

   1 /* Kqueue(2)-based ae.c module
   2  * Copyright (C) 2009 Harish Mallipeddi - harish.mallipeddi@gmail.com
   3  * Released under the BSD license. See the COPYING file for more info. */
   4
   5 #include <sys/types.h>
   6 #include <sys/event.h>
   7 #include <sys/time.h>
   8
   9 typedef struct aeApiState {
  10     int kqfd;
  11     struct kevent events[AE_SETSIZE];
  12 } aeApiState;
  13
  14 static int aeApiCreate(aeEventLoop *eventLoop) {
  15     aeApiState *state = zmalloc(sizeof(aeApiState));
  16
  17     if (!state) return -1;
  18     state->kqfd = kqueue();
  19     if (state->kqfd == -1) return -1;
  20     eventLoop->apidata = state;
  21
  22     return 0;
  23 }
  24
  25 static void aeApiFree(aeEventLoop *eventLoop) {
  26     aeApiState *state = eventLoop->apidata;
  27
  28     close(state->kqfd);
  29     zfree(state);
  30 }
  31
  32 static int aeApiAddEvent(aeEventLoop *eventLoop, int fd, int mask) {
  33     aeApiState *state = eventLoop->apidata;
  34     struct kevent ke;
  35
  36     if (mask & AE_READABLE) {
  37         EV_SET(&ke, fd, EVFILT_READ, EV_ADD, 0, 0, NULL);
  38         if (kevent(state->kqfd, &ke, 1, NULL, 0, NULL) == -1) return -1;
  39     }
  40     if (mask & AE_WRITABLE) {
  41         EV_SET(&ke, fd, EVFILT_WRITE, EV_ADD, 0, 0, NULL);
  42         if (kevent(state->kqfd, &ke, 1, NULL, 0, NULL) == -1) return -1;
  43     }
  44     return 0;
  45 }
  46
  47 static void aeApiDelEvent(aeEventLoop *eventLoop, int fd, int mask) {
  48     aeApiState *state = eventLoop->apidata;
  49     struct kevent ke;
  50
  51     if (mask & AE_READABLE) {
  52         EV_SET(&ke, fd, EVFILT_READ, EV_DELETE, 0, 0, NULL);
  53         kevent(state->kqfd, &ke, 1, NULL, 0, NULL);
  54     }
  55     if (mask & AE_WRITABLE) {
  56         EV_SET(&ke, fd, EVFILT_WRITE, EV_DELETE, 0, 0, NULL);
  57         kevent(state->kqfd, &ke, 1, NULL, 0, NULL);
  58     }
  59 }
  60
  61 static int aeApiPoll(aeEventLoop *eventLoop, struct timeval *tvp) {
  62     aeApiState *state = eventLoop->apidata;
  63     int retval, numevents = 0;
  64
  65     if (tvp != NULL) {
  66         struct timespec timeout;
  67         timeout.tv_sec = tvp->tv_sec;
  68         timeout.tv_nsec = tvp->tv_usec * 1000;
  69         retval = kevent(state->kqfd, NULL, 0, state->events, AE_SETSIZE, &timeout);
  70     } else {
  71         retval = kevent(state->kqfd, NULL, 0, state->events, AE_SETSIZE, NULL);
  72     }
  73
  74     if (retval > 0) {
  75         int j;
  76
  77         numevents = retval;
  78         for(j = 0; j < numevents; j++) {
  79             int mask = 0;
  80             struct kevent *e = state->events+j;
  81
  82             if (e->filter == EVFILT_READ) mask |= AE_READABLE;
  83             if (e->filter == EVFILT_WRITE) mask |= AE_WRITABLE;
  84             eventLoop->fired[j].fd = e->ident;
  85             eventLoop->fired[j].mask = mask;
  86         }
  87     }
  88     return numevents;
  89 }
  90
  91 static char *aeApiName(void) {
  92     return "kqueue";
  93 }