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/usr/include/hiredis/adapters/ivykis.h is in libhiredis-dev 0.13.3-2.

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#ifndef __HIREDIS_IVYKIS_H__
#define __HIREDIS_IVYKIS_H__
#include <iv.h>
#include "../hiredis.h"
#include "../async.h"

typedef struct redisIvykisEvents {
    redisAsyncContext *context;
    struct iv_fd fd;
} redisIvykisEvents;

static void redisIvykisReadEvent(void *arg) {
    redisAsyncContext *context = (redisAsyncContext *)arg;
    redisAsyncHandleRead(context);
}

static void redisIvykisWriteEvent(void *arg) {
    redisAsyncContext *context = (redisAsyncContext *)arg;
    redisAsyncHandleWrite(context);
}

static void redisIvykisAddRead(void *privdata) {
    redisIvykisEvents *e = (redisIvykisEvents*)privdata;
    iv_fd_set_handler_in(&e->fd, redisIvykisReadEvent);
}

static void redisIvykisDelRead(void *privdata) {
    redisIvykisEvents *e = (redisIvykisEvents*)privdata;
    iv_fd_set_handler_in(&e->fd, NULL);
}

static void redisIvykisAddWrite(void *privdata) {
    redisIvykisEvents *e = (redisIvykisEvents*)privdata;
    iv_fd_set_handler_out(&e->fd, redisIvykisWriteEvent);
}

static void redisIvykisDelWrite(void *privdata) {
    redisIvykisEvents *e = (redisIvykisEvents*)privdata;
    iv_fd_set_handler_out(&e->fd, NULL);
}

static void redisIvykisCleanup(void *privdata) {
    redisIvykisEvents *e = (redisIvykisEvents*)privdata;

    iv_fd_unregister(&e->fd);
    free(e);
}

static int redisIvykisAttach(redisAsyncContext *ac) {
    redisContext *c = &(ac->c);
    redisIvykisEvents *e;

    /* Nothing should be attached when something is already attached */
    if (ac->ev.data != NULL)
        return REDIS_ERR;

    /* Create container for context and r/w events */
    e = (redisIvykisEvents*)malloc(sizeof(*e));
    e->context = ac;

    /* Register functions to start/stop listening for events */
    ac->ev.addRead = redisIvykisAddRead;
    ac->ev.delRead = redisIvykisDelRead;
    ac->ev.addWrite = redisIvykisAddWrite;
    ac->ev.delWrite = redisIvykisDelWrite;
    ac->ev.cleanup = redisIvykisCleanup;
    ac->ev.data = e;

    /* Initialize and install read/write events */
    IV_FD_INIT(&e->fd);
    e->fd.fd = c->fd;
    e->fd.handler_in = redisIvykisReadEvent;
    e->fd.handler_out = redisIvykisWriteEvent;
    e->fd.handler_err = NULL;
    e->fd.cookie = e->context;

    iv_fd_register(&e->fd);

    return REDIS_OK;
}
#endif