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/*
* Copyright (c) 2009-2012 Niels Provos, Nick Mathewson
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/types.h>
#include "event2/event-config.h"
#ifdef WIN32
#ifndef _WIN32_WINNT
/* Minimum required for InitializeCriticalSectionAndSpinCount */
#define _WIN32_WINNT 0x0403
#endif
#include <winsock2.h>
#include <ws2tcpip.h>
#include <mswsock.h>
#endif
#include <errno.h>
#ifdef _EVENT_HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#ifdef _EVENT_HAVE_FCNTL_H
#include <fcntl.h>
#endif
#ifdef _EVENT_HAVE_UNISTD_H
#include <unistd.h>
#endif
#include "event2/listener.h"
#include "event2/util.h"
#include "event2/event.h"
#include "event2/event_struct.h"
#include "mm-internal.h"
#include "util-internal.h"
#include "log-internal.h"
#include "evthread-internal.h"
#ifdef WIN32
#include "iocp-internal.h"
#include "defer-internal.h"
#include "event-internal.h"
#endif
struct evconnlistener_ops {
int (*enable)(struct evconnlistener *);
int (*disable)(struct evconnlistener *);
void (*destroy)(struct evconnlistener *);
void (*shutdown)(struct evconnlistener *);
evutil_socket_t (*getfd)(struct evconnlistener *);
struct event_base *(*getbase)(struct evconnlistener *);
};
struct evconnlistener {
const struct evconnlistener_ops *ops;
void *lock;
evconnlistener_cb cb;
evconnlistener_errorcb errorcb;
void *user_data;
unsigned flags;
short refcnt;
unsigned enabled : 1;
};
struct evconnlistener_event {
struct evconnlistener base;
struct event listener;
};
#ifdef WIN32
struct evconnlistener_iocp {
struct evconnlistener base;
evutil_socket_t fd;
struct event_base *event_base;
struct event_iocp_port *port;
short n_accepting;
unsigned shutting_down : 1;
unsigned event_added : 1;
struct accepting_socket **accepting;
};
#endif
#define LOCK(listener) EVLOCK_LOCK((listener)->lock, 0)
#define UNLOCK(listener) EVLOCK_UNLOCK((listener)->lock, 0)
struct evconnlistener *
evconnlistener_new_async(struct event_base *base,
evconnlistener_cb cb, void *ptr, unsigned flags, int backlog,
evutil_socket_t fd); /* XXXX export this? */
static int event_listener_enable(struct evconnlistener *);
static int event_listener_disable(struct evconnlistener *);
static void event_listener_destroy(struct evconnlistener *);
static evutil_socket_t event_listener_getfd(struct evconnlistener *);
static struct event_base *event_listener_getbase(struct evconnlistener *);
#if 0
static void
listener_incref_and_lock(struct evconnlistener *listener)
{
LOCK(listener);
++listener->refcnt;
}
#endif
static int
listener_decref_and_unlock(struct evconnlistener *listener)
{
int refcnt = --listener->refcnt;
if (refcnt == 0) {
listener->ops->destroy(listener);
UNLOCK(listener);
EVTHREAD_FREE_LOCK(listener->lock, EVTHREAD_LOCKTYPE_RECURSIVE);
mm_free(listener);
return 1;
} else {
UNLOCK(listener);
return 0;
}
}
static const struct evconnlistener_ops evconnlistener_event_ops = {
event_listener_enable,
event_listener_disable,
event_listener_destroy,
NULL, /* shutdown */
event_listener_getfd,
event_listener_getbase
};
static void listener_read_cb(evutil_socket_t, short, void *);
struct evconnlistener *
evconnlistener_new(struct event_base *base,
evconnlistener_cb cb, void *ptr, unsigned flags, int backlog,
evutil_socket_t fd)
{
struct evconnlistener_event *lev;
#ifdef WIN32
if (base && event_base_get_iocp(base)) {
const struct win32_extension_fns *ext =
event_get_win32_extension_fns();
if (ext->AcceptEx && ext->GetAcceptExSockaddrs)
return evconnlistener_new_async(base, cb, ptr, flags,
backlog, fd);
}
#endif
if (backlog > 0) {
if (listen(fd, backlog) < 0)
return NULL;
} else if (backlog < 0) {
if (listen(fd, 128) < 0)
return NULL;
}
lev = mm_calloc(1, sizeof(struct evconnlistener_event));
if (!lev)
return NULL;
lev->base.ops = &evconnlistener_event_ops;
lev->base.cb = cb;
lev->base.user_data = ptr;
lev->base.flags = flags;
lev->base.refcnt = 1;
if (flags & LEV_OPT_THREADSAFE) {
EVTHREAD_ALLOC_LOCK(lev->base.lock, EVTHREAD_LOCKTYPE_RECURSIVE);
}
event_assign(&lev->listener, base, fd, EV_READ|EV_PERSIST,
listener_read_cb, lev);
evconnlistener_enable(&lev->base);
return &lev->base;
}
struct evconnlistener *
evconnlistener_new_bind(struct event_base *base, evconnlistener_cb cb,
void *ptr, unsigned flags, int backlog, const struct sockaddr *sa,
int socklen)
{
struct evconnlistener *listener;
evutil_socket_t fd;
int on = 1;
int family = sa ? sa->sa_family : AF_UNSPEC;
if (backlog == 0)
return NULL;
fd = socket(family, SOCK_STREAM, 0);
if (fd == -1)
return NULL;
if (evutil_make_socket_nonblocking(fd) < 0) {
evutil_closesocket(fd);
return NULL;
}
if (flags & LEV_OPT_CLOSE_ON_EXEC) {
if (evutil_make_socket_closeonexec(fd) < 0) {
evutil_closesocket(fd);
return NULL;
}
}
setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (void*)&on, sizeof(on));
if (flags & LEV_OPT_REUSEABLE) {
evutil_make_listen_socket_reuseable(fd);
}
if (sa) {
if (bind(fd, sa, socklen)<0) {
evutil_closesocket(fd);
return NULL;
}
}
listener = evconnlistener_new(base, cb, ptr, flags, backlog, fd);
if (!listener) {
evutil_closesocket(fd);
return NULL;
}
return listener;
}
void
evconnlistener_free(struct evconnlistener *lev)
{
LOCK(lev);
lev->cb = NULL;
lev->errorcb = NULL;
if (lev->ops->shutdown)
lev->ops->shutdown(lev);
listener_decref_and_unlock(lev);
}
static void
event_listener_destroy(struct evconnlistener *lev)
{
struct evconnlistener_event *lev_e =
EVUTIL_UPCAST(lev, struct evconnlistener_event, base);
event_del(&lev_e->listener);
if (lev->flags & LEV_OPT_CLOSE_ON_FREE)
evutil_closesocket(event_get_fd(&lev_e->listener));
event_debug_unassign(&lev_e->listener);
}
int
evconnlistener_enable(struct evconnlistener *lev)
{
int r;
LOCK(lev);
lev->enabled = 1;
if (lev->cb)
r = lev->ops->enable(lev);
else
r = 0;
UNLOCK(lev);
return r;
}
int
evconnlistener_disable(struct evconnlistener *lev)
{
int r;
LOCK(lev);
lev->enabled = 0;
r = lev->ops->disable(lev);
UNLOCK(lev);
return r;
}
static int
event_listener_enable(struct evconnlistener *lev)
{
struct evconnlistener_event *lev_e =
EVUTIL_UPCAST(lev, struct evconnlistener_event, base);
return event_add(&lev_e->listener, NULL);
}
static int
event_listener_disable(struct evconnlistener *lev)
{
struct evconnlistener_event *lev_e =
EVUTIL_UPCAST(lev, struct evconnlistener_event, base);
return event_del(&lev_e->listener);
}
evutil_socket_t
evconnlistener_get_fd(struct evconnlistener *lev)
{
evutil_socket_t fd;
LOCK(lev);
fd = lev->ops->getfd(lev);
UNLOCK(lev);
return fd;
}
static evutil_socket_t
event_listener_getfd(struct evconnlistener *lev)
{
struct evconnlistener_event *lev_e =
EVUTIL_UPCAST(lev, struct evconnlistener_event, base);
return event_get_fd(&lev_e->listener);
}
struct event_base *
evconnlistener_get_base(struct evconnlistener *lev)
{
struct event_base *base;
LOCK(lev);
base = lev->ops->getbase(lev);
UNLOCK(lev);
return base;
}
static struct event_base *
event_listener_getbase(struct evconnlistener *lev)
{
struct evconnlistener_event *lev_e =
EVUTIL_UPCAST(lev, struct evconnlistener_event, base);
return event_get_base(&lev_e->listener);
}
void
evconnlistener_set_cb(struct evconnlistener *lev,
evconnlistener_cb cb, void *arg)
{
int enable = 0;
LOCK(lev);
if (lev->enabled && !lev->cb)
enable = 1;
lev->cb = cb;
lev->user_data = arg;
if (enable)
evconnlistener_enable(lev);
UNLOCK(lev);
}
void
evconnlistener_set_error_cb(struct evconnlistener *lev,
evconnlistener_errorcb errorcb)
{
LOCK(lev);
lev->errorcb = errorcb;
UNLOCK(lev);
}
static void
listener_read_cb(evutil_socket_t fd, short what, void *p)
{
struct evconnlistener *lev = p;
int err;
evconnlistener_cb cb;
evconnlistener_errorcb errorcb;
void *user_data;
LOCK(lev);
while (1) {
struct sockaddr_storage ss;
#ifdef WIN32
int socklen = sizeof(ss);
#else
socklen_t socklen = sizeof(ss);
#endif
evutil_socket_t new_fd = accept(fd, (struct sockaddr*)&ss, &socklen);
if (new_fd < 0)
break;
if (socklen == 0) {
/* This can happen with some older linux kernels in
* response to nmap. */
evutil_closesocket(new_fd);
continue;
}
if (!(lev->flags & LEV_OPT_LEAVE_SOCKETS_BLOCKING))
evutil_make_socket_nonblocking(new_fd);
if (lev->cb == NULL) {
UNLOCK(lev);
return;
}
++lev->refcnt;
cb = lev->cb;
user_data = lev->user_data;
UNLOCK(lev);
cb(lev, new_fd, (struct sockaddr*)&ss, (int)socklen,
user_data);
LOCK(lev);
if (lev->refcnt == 1) {
int freed = listener_decref_and_unlock(lev);
EVUTIL_ASSERT(freed);
return;
}
--lev->refcnt;
}
err = evutil_socket_geterror(fd);
if (EVUTIL_ERR_ACCEPT_RETRIABLE(err)) {
UNLOCK(lev);
return;
}
if (lev->errorcb != NULL) {
++lev->refcnt;
errorcb = lev->errorcb;
user_data = lev->user_data;
UNLOCK(lev);
errorcb(lev, user_data);
LOCK(lev);
listener_decref_and_unlock(lev);
} else {
event_sock_warn(fd, "Error from accept() call");
}
}
#ifdef WIN32
struct accepting_socket {
CRITICAL_SECTION lock;
struct event_overlapped overlapped;
SOCKET s;
int error;
struct deferred_cb deferred;
struct evconnlistener_iocp *lev;
ev_uint8_t buflen;
ev_uint8_t family;
unsigned free_on_cb:1;
char addrbuf[1];
};
static void accepted_socket_cb(struct event_overlapped *o, ev_uintptr_t key,
ev_ssize_t n, int ok);
static void accepted_socket_invoke_user_cb(struct deferred_cb *cb, void *arg);
static void
iocp_listener_event_add(struct evconnlistener_iocp *lev)
{
if (lev->event_added)
return;
lev->event_added = 1;
event_base_add_virtual(lev->event_base);
}
static void
iocp_listener_event_del(struct evconnlistener_iocp *lev)
{
if (!lev->event_added)
return;
lev->event_added = 0;
event_base_del_virtual(lev->event_base);
}
static struct accepting_socket *
new_accepting_socket(struct evconnlistener_iocp *lev, int family)
{
struct accepting_socket *res;
int addrlen;
int buflen;
if (family == AF_INET)
addrlen = sizeof(struct sockaddr_in);
else if (family == AF_INET6)
addrlen = sizeof(struct sockaddr_in6);
else
return NULL;
buflen = (addrlen+16)*2;
res = mm_calloc(1,sizeof(struct accepting_socket)-1+buflen);
if (!res)
return NULL;
event_overlapped_init(&res->overlapped, accepted_socket_cb);
res->s = INVALID_SOCKET;
res->lev = lev;
res->buflen = buflen;
res->family = family;
event_deferred_cb_init(&res->deferred,
accepted_socket_invoke_user_cb, res);
InitializeCriticalSectionAndSpinCount(&res->lock, 1000);
return res;
}
static void
free_and_unlock_accepting_socket(struct accepting_socket *as)
{
/* requires lock. */
if (as->s != INVALID_SOCKET)
closesocket(as->s);
LeaveCriticalSection(&as->lock);
DeleteCriticalSection(&as->lock);
mm_free(as);
}
static int
start_accepting(struct accepting_socket *as)
{
/* requires lock */
const struct win32_extension_fns *ext = event_get_win32_extension_fns();
DWORD pending = 0;
SOCKET s = socket(as->family, SOCK_STREAM, 0);
int error = 0;
if (!as->lev->base.enabled)
return 0;
if (s == INVALID_SOCKET) {
error = WSAGetLastError();
goto report_err;
}
/* XXXX It turns out we need to do this again later. Does this call
* have any effect? */
setsockopt(s, SOL_SOCKET, SO_UPDATE_ACCEPT_CONTEXT,
(char *)&as->lev->fd, sizeof(&as->lev->fd));
if (!(as->lev->base.flags & LEV_OPT_LEAVE_SOCKETS_BLOCKING))
evutil_make_socket_nonblocking(s);
if (event_iocp_port_associate(as->lev->port, s, 1) < 0) {
closesocket(s);
return -1;
}
as->s = s;
if (ext->AcceptEx(as->lev->fd, s, as->addrbuf, 0,
as->buflen/2, as->buflen/2, &pending, &as->overlapped.overlapped))
{
/* Immediate success! */
accepted_socket_cb(&as->overlapped, 1, 0, 1);
} else {
error = WSAGetLastError();
if (error != ERROR_IO_PENDING) {
goto report_err;
}
}
return 0;
report_err:
as->error = error;
event_deferred_cb_schedule(
event_base_get_deferred_cb_queue(as->lev->event_base),
&as->deferred);
return 0;
}
static void
stop_accepting(struct accepting_socket *as)
{
/* requires lock. */
SOCKET s = as->s;
as->s = INVALID_SOCKET;
closesocket(s);
}
static void
accepted_socket_invoke_user_cb(struct deferred_cb *dcb, void *arg)
{
struct accepting_socket *as = arg;
struct sockaddr *sa_local=NULL, *sa_remote=NULL;
int socklen_local=0, socklen_remote=0;
const struct win32_extension_fns *ext = event_get_win32_extension_fns();
struct evconnlistener *lev = &as->lev->base;
evutil_socket_t sock=-1;
void *data;
evconnlistener_cb cb=NULL;
evconnlistener_errorcb errorcb=NULL;
int error;
EVUTIL_ASSERT(ext->GetAcceptExSockaddrs);
LOCK(lev);
EnterCriticalSection(&as->lock);
if (as->free_on_cb) {
free_and_unlock_accepting_socket(as);
listener_decref_and_unlock(lev);
return;
}
++lev->refcnt;
error = as->error;
if (error) {
as->error = 0;
errorcb = lev->errorcb;
} else {
ext->GetAcceptExSockaddrs(
as->addrbuf, 0, as->buflen/2, as->buflen/2,
&sa_local, &socklen_local, &sa_remote,
&socklen_remote);
sock = as->s;
cb = lev->cb;
as->s = INVALID_SOCKET;
/* We need to call this so getsockname, getpeername, and
* shutdown work correctly on the accepted socket. */
/* XXXX handle error? */
setsockopt(sock, SOL_SOCKET, SO_UPDATE_ACCEPT_CONTEXT,
(char *)&as->lev->fd, sizeof(&as->lev->fd));
}
data = lev->user_data;
LeaveCriticalSection(&as->lock);
UNLOCK(lev);
if (errorcb) {
WSASetLastError(error);
errorcb(lev, data);
} else if (cb) {
cb(lev, sock, sa_remote, socklen_remote, data);
}
LOCK(lev);
if (listener_decref_and_unlock(lev))
return;
EnterCriticalSection(&as->lock);
start_accepting(as);
LeaveCriticalSection(&as->lock);
}
static void
accepted_socket_cb(struct event_overlapped *o, ev_uintptr_t key, ev_ssize_t n, int ok)
{
struct accepting_socket *as =
EVUTIL_UPCAST(o, struct accepting_socket, overlapped);
LOCK(&as->lev->base);
EnterCriticalSection(&as->lock);
if (ok) {
/* XXXX Don't do this if some EV_MT flag is set. */
event_deferred_cb_schedule(
event_base_get_deferred_cb_queue(as->lev->event_base),
&as->deferred);
LeaveCriticalSection(&as->lock);
} else if (as->free_on_cb) {
struct evconnlistener *lev = &as->lev->base;
free_and_unlock_accepting_socket(as);
listener_decref_and_unlock(lev);
return;
} else if (as->s == INVALID_SOCKET) {
/* This is okay; we were disabled by iocp_listener_disable. */
LeaveCriticalSection(&as->lock);
} else {
/* Some error on accept that we couldn't actually handle. */
BOOL ok;
DWORD transfer = 0, flags=0;
event_sock_warn(as->s, "Unexpected error on AcceptEx");
ok = WSAGetOverlappedResult(as->s, &o->overlapped,
&transfer, FALSE, &flags);
if (ok) {
/* well, that was confusing! */
as->error = 1;
} else {
as->error = WSAGetLastError();
}
event_deferred_cb_schedule(
event_base_get_deferred_cb_queue(as->lev->event_base),
&as->deferred);
LeaveCriticalSection(&as->lock);
}
UNLOCK(&as->lev->base);
}
static int
iocp_listener_enable(struct evconnlistener *lev)
{
int i;
struct evconnlistener_iocp *lev_iocp =
EVUTIL_UPCAST(lev, struct evconnlistener_iocp, base);
LOCK(lev);
iocp_listener_event_add(lev_iocp);
for (i = 0; i < lev_iocp->n_accepting; ++i) {
struct accepting_socket *as = lev_iocp->accepting[i];
if (!as)
continue;
EnterCriticalSection(&as->lock);
if (!as->free_on_cb && as->s == INVALID_SOCKET)
start_accepting(as);
LeaveCriticalSection(&as->lock);
}
UNLOCK(lev);
return 0;
}
static int
iocp_listener_disable_impl(struct evconnlistener *lev, int shutdown)
{
int i;
struct evconnlistener_iocp *lev_iocp =
EVUTIL_UPCAST(lev, struct evconnlistener_iocp, base);
LOCK(lev);
iocp_listener_event_del(lev_iocp);
for (i = 0; i < lev_iocp->n_accepting; ++i) {
struct accepting_socket *as = lev_iocp->accepting[i];
if (!as)
continue;
EnterCriticalSection(&as->lock);
if (!as->free_on_cb && as->s != INVALID_SOCKET) {
if (shutdown)
as->free_on_cb = 1;
stop_accepting(as);
}
LeaveCriticalSection(&as->lock);
}
UNLOCK(lev);
return 0;
}
static int
iocp_listener_disable(struct evconnlistener *lev)
{
return iocp_listener_disable_impl(lev,0);
}
static void
iocp_listener_destroy(struct evconnlistener *lev)
{
struct evconnlistener_iocp *lev_iocp =
EVUTIL_UPCAST(lev, struct evconnlistener_iocp, base);
if (! lev_iocp->shutting_down) {
lev_iocp->shutting_down = 1;
iocp_listener_disable_impl(lev,1);
}
}
static evutil_socket_t
iocp_listener_getfd(struct evconnlistener *lev)
{
struct evconnlistener_iocp *lev_iocp =
EVUTIL_UPCAST(lev, struct evconnlistener_iocp, base);
return lev_iocp->fd;
}
static struct event_base *
iocp_listener_getbase(struct evconnlistener *lev)
{
struct evconnlistener_iocp *lev_iocp =
EVUTIL_UPCAST(lev, struct evconnlistener_iocp, base);
return lev_iocp->event_base;
}
static const struct evconnlistener_ops evconnlistener_iocp_ops = {
iocp_listener_enable,
iocp_listener_disable,
iocp_listener_destroy,
iocp_listener_destroy, /* shutdown */
iocp_listener_getfd,
iocp_listener_getbase
};
/* XXX define some way to override this. */
#define N_SOCKETS_PER_LISTENER 4
struct evconnlistener *
evconnlistener_new_async(struct event_base *base,
evconnlistener_cb cb, void *ptr, unsigned flags, int backlog,
evutil_socket_t fd)
{
struct sockaddr_storage ss;
int socklen = sizeof(ss);
struct evconnlistener_iocp *lev;
int i;
flags |= LEV_OPT_THREADSAFE;
if (!base || !event_base_get_iocp(base))
goto err;
/* XXXX duplicate code */
if (backlog > 0) {
if (listen(fd, backlog) < 0)
goto err;
} else if (backlog < 0) {
if (listen(fd, 128) < 0)
goto err;
}
if (getsockname(fd, (struct sockaddr*)&ss, &socklen)) {
event_sock_warn(fd, "getsockname");
goto err;
}
lev = mm_calloc(1, sizeof(struct evconnlistener_iocp));
if (!lev) {
event_warn("calloc");
goto err;
}
lev->base.ops = &evconnlistener_iocp_ops;
lev->base.cb = cb;
lev->base.user_data = ptr;
lev->base.flags = flags;
lev->base.refcnt = 1;
lev->base.enabled = 1;
lev->port = event_base_get_iocp(base);
lev->fd = fd;
lev->event_base = base;
if (event_iocp_port_associate(lev->port, fd, 1) < 0)
goto err_free_lev;
EVTHREAD_ALLOC_LOCK(lev->base.lock, EVTHREAD_LOCKTYPE_RECURSIVE);
lev->n_accepting = N_SOCKETS_PER_LISTENER;
lev->accepting = mm_calloc(lev->n_accepting,
sizeof(struct accepting_socket *));
if (!lev->accepting) {
event_warn("calloc");
goto err_delete_lock;
}
for (i = 0; i < lev->n_accepting; ++i) {
lev->accepting[i] = new_accepting_socket(lev, ss.ss_family);
if (!lev->accepting[i]) {
event_warnx("Couldn't create accepting socket");
goto err_free_accepting;
}
if (cb && start_accepting(lev->accepting[i]) < 0) {
event_warnx("Couldn't start accepting on socket");
EnterCriticalSection(&lev->accepting[i]->lock);
free_and_unlock_accepting_socket(lev->accepting[i]);
goto err_free_accepting;
}
++lev->base.refcnt;
}
iocp_listener_event_add(lev);
return &lev->base;
err_free_accepting:
mm_free(lev->accepting);
/* XXXX free the other elements. */
err_delete_lock:
EVTHREAD_FREE_LOCK(lev->base.lock, EVTHREAD_LOCKTYPE_RECURSIVE);
err_free_lev:
mm_free(lev);
err:
/* Don't close the fd, it is caller's responsibility. */
return NULL;
}
#endif
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