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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */

/* Cherokee
*
* Authors:
* Alvaro Lopez Ortega <alvaro@alobbs.com>
*
* Copyright (C) 2001-2013 Alvaro Lopez Ortega
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of version 2 of the GNU General Public
* License as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/

#include "common-internal.h"
#include "fdpoll-protected.h"
#include "util.h"

#include <stdio.h>
#include <sys/types.h>
#include <sys/event.h>
#include <sys/time.h>
#include <unistd.h>
#include <errno.h>

#define KQUEUE_READ_EVENT 1
#define KQUEUE_WRITE_EVENT (1 << 1)
#define KQUEUE_CLOSE (1 << 2)


/***********************************************************************/
/* kqueue, kevent: kernel event notification mechanism */
/* */
/* #include <sys/event.h> */
/* #include <sys/time.h> */
/* */
/* int */
/* kqueue(void); */
/* */
/* int */
/* kevent(int kq, const struct kevent *changelist, size_t nchanges, */
/* struct kevent *eventlist, size_t nevents, */
/* const struct timespec *timeout); */
/* */
/* EV_SET(&kev, ident, filter, flags, fflags, data, udata); */
/* */
/***********************************************************************/


typedef struct {
struct cherokee_fdpoll poll;

int kqueue;
struct kevent *changelist;
int *fdevents;
int *fdinterest;
size_t nchanges;
} cherokee_fdpoll_kqueue_t;


static ret_t
_free (cherokee_fdpoll_kqueue_t *fdp)
{
if (fdp == NULL)
return ret_ok;

if (fdp->kqueue >= 0)
close (fdp->kqueue);

/* ANSI C required, so that free() can handle NULL pointers
*/
free (fdp->changelist);
free (fdp->fdevents);
free (fdp->fdinterest);

/* Caller has to set this pointer to NULL.
*/
free (fdp);
return ret_ok;
}


static ret_t
_add_change(cherokee_fdpoll_kqueue_t *fdp, int fd, int rw, int change )
{
int index;
struct kevent *event;

index = fdp->nchanges;
if (unlikely (index >= FDPOLL(fdp)->nfiles)) {
PRINT_ERROR_S("kqueue_add: fdpoll is full !\n");
return ret_error;
}

event = &fdp->changelist[index];
event->ident = fd;
switch (rw) {
case FDPOLL_MODE_READ:
event->filter = EVFILT_READ;
break;
case FDPOLL_MODE_WRITE:
event->filter = EVFILT_WRITE;
break;
default:
SHOULDNT_HAPPEN;
        }

event->flags = change;
event->fflags = 0;

fdp->fdinterest[fd] = rw;
fdp->nchanges++;

return ret_ok;
}


static ret_t
_add (cherokee_fdpoll_kqueue_t *fdp, int fd, int rw)
{
int re;

re = _add_change (fdp, fd, rw, EV_ADD);
if (re == ret_ok) {
FDPOLL(fdp)->npollfds++;
}

return re;
}


static ret_t
_del (cherokee_fdpoll_kqueue_t *fdp, int fd)
{
int re;

re = _add_change (fdp, fd, fdp->fdinterest[fd], EV_DELETE);
if (re == ret_ok) {
FDPOLL(fdp)->npollfds--;
}

return re;
}


static int
_watch (cherokee_fdpoll_kqueue_t *fdp, int timeout_msecs)
{
struct timespec timeout;
int i;
int n_events;

timeout.tv_sec = timeout_msecs/1000L;
timeout.tv_nsec = ( timeout_msecs % 1000L ) * 1000000L;

/* Get the events of the file descriptors with
* activity
*/
again:
n_events = kevent (fdp->kqueue,
fdp->changelist,
fdp->nchanges,
fdp->changelist,
FDPOLL(fdp)->nfiles,
&timeout);

fdp->nchanges = 0;

if (unlikely (n_events < 0)) {
if (errno == EINTR)
goto again;

LOG_ERRNO (errno, cherokee_err_error, CHEROKEE_ERROR_FDPOLL_KQUEUE);
return 0;

} else if (n_events > 0) {
memset (fdp->fdevents, 0, FDPOLL(fdp)->system_nfiles * sizeof(int));

for (i = 0; i < n_events; ++i) {
/* Filter */
if (fdp->changelist[i].filter == EVFILT_READ) {
fdp->fdevents[fdp->changelist[i].ident] = KQUEUE_READ_EVENT;
} else if (fdp->changelist[i].filter == EVFILT_WRITE) {
fdp->fdevents[fdp->changelist[i].ident] = KQUEUE_WRITE_EVENT;
} else {
SHOULDNT_HAPPEN;
}

/* Flags */
if (fdp->changelist[i].flags & (EV_EOF | EV_ERROR)) {
fdp->fdevents[fdp->changelist[i].ident] = KQUEUE_CLOSE;
}
}
}

return n_events;
}

static int
_check (cherokee_fdpoll_kqueue_t *fdp, int fd, int rw)
{
uint32_t events;

/* Sanity check: is it a wrong fd?
*/
if (unlikely (fd < 0)) {
return -1;
}

events = fdp->fdevents[fd];

if (events & KQUEUE_CLOSE) {
return 1;
}

switch (rw) {
case FDPOLL_MODE_READ:
events &= KQUEUE_READ_EVENT;
break;
case FDPOLL_MODE_WRITE:
events &= KQUEUE_WRITE_EVENT;
break;
default:
SHOULDNT_HAPPEN;
}

return events;
}


static ret_t
_reset (cherokee_fdpoll_kqueue_t *fdp, int fd)
{
UNUSED(fdp);
UNUSED(fd);

return ret_ok;
}


static ret_t
_set_mode (cherokee_fdpoll_kqueue_t *fdp, int fd, int rw)
{
/* If transitioning from r -> w or from w -> r
* disable any active event on the fd as we are
* no longer interested on it.
*/
if ((rw == FDPOLL_MODE_WRITE) &&
(fdp->fdinterest[fd] == FDPOLL_MODE_READ))
{
_add_change (fdp, fd, FDPOLL_MODE_READ, EV_DELETE);

} else if ((rw == FDPOLL_MODE_READ) &&
(fdp->fdinterest[fd] == FDPOLL_MODE_WRITE))
{
_add_change (fdp, fd, FDPOLL_MODE_WRITE, EV_DELETE);
}

return _add_change (fdp, fd, rw, EV_ADD);
}


ret_t
fdpoll_kqueue_get_fdlimits (cuint_t *system_fd_limit, cuint_t *fd_limit)
{
*system_fd_limit = 0;
*fd_limit = 0;

return ret_ok;
}


ret_t
fdpoll_kqueue_new (cherokee_fdpoll_t **fdp, int sys_fd_limit, int fd_limit)
{
int re;
cherokee_fdpoll_t *nfd;

CHEROKEE_CNEW_STRUCT (1, n, fdpoll_kqueue);

nfd = FDPOLL(n);

/* Init base class properties
*/
nfd->type = cherokee_poll_kqueue;
nfd->nfiles = fd_limit;
nfd->system_nfiles = sys_fd_limit;
nfd->npollfds = 0;

/* Init base class virtual methods
*/
nfd->free = (fdpoll_func_free_t) _free;
nfd->add = (fdpoll_func_add_t) _add;
nfd->del = (fdpoll_func_del_t) _del;
nfd->reset = (fdpoll_func_reset_t) _reset;
nfd->set_mode = (fdpoll_func_set_mode_t) _set_mode;
nfd->check = (fdpoll_func_check_t) _check;
nfd->watch = (fdpoll_func_watch_t) _watch;

/* Init kqueue specific variables
*/
n->kqueue = -1;
n->nchanges = 0;
n->changelist = (struct kevent *) calloc (nfd->nfiles * 2, sizeof(struct kevent));
n->fdevents = (int *) calloc (nfd->system_nfiles, sizeof(int));
n->fdinterest = (int *) calloc (nfd->system_nfiles, sizeof(int));

if (n->fdevents == NULL || n->changelist == NULL || n->fdinterest == NULL) {
_free (n);
return ret_nomem;
}

n->kqueue = kqueue();
if (n->kqueue == -1) {
_free (n);
return ret_error;
}

re = fcntl (n->kqueue, F_SETFD, FD_CLOEXEC);
if (re < 0) {
LOG_ERRNO (errno, cherokee_err_error,
CHEROKEE_ERROR_FDPOLL_EPOLL_CLOEXEC);
_free (n);
return ret_error;
}

/* Return the object
*/
*fdp = nfd;
return ret_ok;
}
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