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/* Copyright (C) 2011 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
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, see <http://www.gnu.org/licenses/>.
*/
#ifndef _GNU_SOURCE
#define _GNU_SOURCE /* Required for RTLD_DEFAULT. */
#endif
#include <dlfcn.h>
#include <string.h>
#include <stdio.h>
#include "common/fdset.h"
#include <config.h>
struct fdset_backend_t _fdset_backend = {
};
/*! \brief Set backend implementation. */
static void fdset_set_backend(struct fdset_backend_t *backend) {
memcpy(&_fdset_backend, backend, sizeof(struct fdset_backend_t));
}
/* Linux epoll API. */
#ifdef HAVE_EPOLL_WAIT
#include "common/fdset_epoll.h"
#endif /* HAVE_EPOLL_WAIT */
/* BSD kqueue API */
#ifdef HAVE_KQUEUE
#include "common/fdset_kqueue.h"
#endif /* HAVE_KQUEUE */
/* POSIX poll API */
#ifdef HAVE_POLL
#include "common/fdset_poll.h"
#endif /* HAVE_POLL */
/*! \brief Bootstrap polling subsystem (it is called automatically). */
void __attribute__ ((constructor)) fdset_init()
{
/* Preference: epoll */
#ifdef HAVE_EPOLL_WAIT
if (dlsym(RTLD_DEFAULT, "epoll_wait") != 0) {
fdset_set_backend(&FDSET_EPOLL);
return;
}
#endif
/* Preference: kqueue */
#ifdef HAVE_KQUEUE
if (dlsym(RTLD_DEFAULT, "kqueue") != 0) {
fdset_set_backend(&FDSET_KQUEUE);
return;
}
#endif
/* Fallback: poll */
#ifdef HAVE_POLL
if (dlsym(RTLD_DEFAULT, "poll") != 0) {
fdset_set_backend(&FDSET_POLL);
return;
}
#endif
/* This shouldn't happen. */
fprintf(stderr, "fdset: fatal error - no valid fdset backend found\n");
return;
}
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