mirror of
https://gitlab.com/qemu-project/qemu
synced 2024-09-06 09:55:55 +00:00
![Laurent Vivier](/assets/img/avatar_default.png)
Move the file descriptor type checking before doing anything with it. If it's not usable, don't close it as it could be in use by another part of QEMU, only fail and report an error. Reviewed-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Laurent Vivier <lvivier@redhat.com> Signed-off-by: Jason Wang <jasowang@redhat.com>
778 lines
22 KiB
C
778 lines
22 KiB
C
/*
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* QEMU System Emulator
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*
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* Copyright (c) 2003-2008 Fabrice Bellard
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "qemu/osdep.h"
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#include "net/net.h"
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#include "clients.h"
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#include "monitor/monitor.h"
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#include "qapi/error.h"
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#include "qemu/error-report.h"
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#include "qemu/option.h"
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#include "qemu/sockets.h"
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#include "qemu/iov.h"
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#include "qemu/main-loop.h"
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typedef struct NetSocketState {
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NetClientState nc;
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int listen_fd;
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int fd;
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SocketReadState rs;
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unsigned int send_index; /* number of bytes sent (only SOCK_STREAM) */
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struct sockaddr_in dgram_dst; /* contains inet host and port destination iff connectionless (SOCK_DGRAM) */
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IOHandler *send_fn; /* differs between SOCK_STREAM/SOCK_DGRAM */
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bool read_poll; /* waiting to receive data? */
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bool write_poll; /* waiting to transmit data? */
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} NetSocketState;
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static void net_socket_accept(void *opaque);
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static void net_socket_writable(void *opaque);
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static void net_socket_update_fd_handler(NetSocketState *s)
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{
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qemu_set_fd_handler(s->fd,
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s->read_poll ? s->send_fn : NULL,
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s->write_poll ? net_socket_writable : NULL,
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s);
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}
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static void net_socket_read_poll(NetSocketState *s, bool enable)
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{
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s->read_poll = enable;
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net_socket_update_fd_handler(s);
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}
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static void net_socket_write_poll(NetSocketState *s, bool enable)
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{
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s->write_poll = enable;
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net_socket_update_fd_handler(s);
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}
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static void net_socket_writable(void *opaque)
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{
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NetSocketState *s = opaque;
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net_socket_write_poll(s, false);
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qemu_flush_queued_packets(&s->nc);
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}
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static ssize_t net_socket_receive(NetClientState *nc, const uint8_t *buf, size_t size)
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{
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NetSocketState *s = DO_UPCAST(NetSocketState, nc, nc);
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uint32_t len = htonl(size);
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struct iovec iov[] = {
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{
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.iov_base = &len,
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.iov_len = sizeof(len),
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}, {
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.iov_base = (void *)buf,
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.iov_len = size,
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},
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};
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size_t remaining;
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ssize_t ret;
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remaining = iov_size(iov, 2) - s->send_index;
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ret = iov_send(s->fd, iov, 2, s->send_index, remaining);
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if (ret == -1 && errno == EAGAIN) {
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ret = 0; /* handled further down */
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}
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if (ret == -1) {
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s->send_index = 0;
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return -errno;
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}
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if (ret < (ssize_t)remaining) {
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s->send_index += ret;
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net_socket_write_poll(s, true);
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return 0;
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}
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s->send_index = 0;
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return size;
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}
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static ssize_t net_socket_receive_dgram(NetClientState *nc, const uint8_t *buf, size_t size)
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{
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NetSocketState *s = DO_UPCAST(NetSocketState, nc, nc);
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ssize_t ret;
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ret = RETRY_ON_EINTR(
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s->dgram_dst.sin_family != AF_UNIX ?
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sendto(s->fd, buf, size, 0,
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(struct sockaddr *)&s->dgram_dst,
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sizeof(s->dgram_dst)) :
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send(s->fd, buf, size, 0)
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);
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if (ret == -1 && errno == EAGAIN) {
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net_socket_write_poll(s, true);
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return 0;
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}
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return ret;
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}
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static void net_socket_send_completed(NetClientState *nc, ssize_t len)
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{
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NetSocketState *s = DO_UPCAST(NetSocketState, nc, nc);
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if (!s->read_poll) {
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net_socket_read_poll(s, true);
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}
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}
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static void net_socket_rs_finalize(SocketReadState *rs)
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{
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NetSocketState *s = container_of(rs, NetSocketState, rs);
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if (qemu_send_packet_async(&s->nc, rs->buf,
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rs->packet_len,
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net_socket_send_completed) == 0) {
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net_socket_read_poll(s, false);
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}
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}
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static void net_socket_send(void *opaque)
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{
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NetSocketState *s = opaque;
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int size;
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int ret;
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uint8_t buf1[NET_BUFSIZE];
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const uint8_t *buf;
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size = recv(s->fd, buf1, sizeof(buf1), 0);
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if (size < 0) {
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if (errno != EWOULDBLOCK)
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goto eoc;
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} else if (size == 0) {
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/* end of connection */
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eoc:
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net_socket_read_poll(s, false);
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net_socket_write_poll(s, false);
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if (s->listen_fd != -1) {
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qemu_set_fd_handler(s->listen_fd, net_socket_accept, NULL, s);
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}
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close(s->fd);
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s->fd = -1;
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net_socket_rs_init(&s->rs, net_socket_rs_finalize, false);
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s->nc.link_down = true;
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qemu_set_info_str(&s->nc, "%s", "");
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return;
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}
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buf = buf1;
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ret = net_fill_rstate(&s->rs, buf, size);
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if (ret == -1) {
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goto eoc;
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}
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}
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static void net_socket_send_dgram(void *opaque)
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{
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NetSocketState *s = opaque;
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int size;
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size = recv(s->fd, s->rs.buf, sizeof(s->rs.buf), 0);
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if (size < 0)
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return;
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if (size == 0) {
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/* end of connection */
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net_socket_read_poll(s, false);
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net_socket_write_poll(s, false);
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return;
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}
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if (qemu_send_packet_async(&s->nc, s->rs.buf, size,
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net_socket_send_completed) == 0) {
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net_socket_read_poll(s, false);
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}
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}
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static int net_socket_mcast_create(struct sockaddr_in *mcastaddr,
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struct in_addr *localaddr,
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Error **errp)
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{
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struct ip_mreq imr;
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int fd;
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int val, ret;
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#ifdef __OpenBSD__
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unsigned char loop;
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#else
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int loop;
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#endif
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if (!IN_MULTICAST(ntohl(mcastaddr->sin_addr.s_addr))) {
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error_setg(errp, "specified mcastaddr %s (0x%08x) "
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"does not contain a multicast address",
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inet_ntoa(mcastaddr->sin_addr),
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(int)ntohl(mcastaddr->sin_addr.s_addr));
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return -1;
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}
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fd = qemu_socket(PF_INET, SOCK_DGRAM, 0);
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if (fd < 0) {
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error_setg_errno(errp, errno, "can't create datagram socket");
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return -1;
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}
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/* Allow multiple sockets to bind the same multicast ip and port by setting
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* SO_REUSEADDR. This is the only situation where SO_REUSEADDR should be set
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* on windows. Use socket_set_fast_reuse otherwise as it sets SO_REUSEADDR
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* only on posix systems.
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*/
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val = 1;
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ret = setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val));
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if (ret < 0) {
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error_setg_errno(errp, errno,
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"can't set socket option SO_REUSEADDR");
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goto fail;
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}
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ret = bind(fd, (struct sockaddr *)mcastaddr, sizeof(*mcastaddr));
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if (ret < 0) {
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error_setg_errno(errp, errno, "can't bind ip=%s to socket",
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inet_ntoa(mcastaddr->sin_addr));
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goto fail;
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}
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/* Add host to multicast group */
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imr.imr_multiaddr = mcastaddr->sin_addr;
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if (localaddr) {
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imr.imr_interface = *localaddr;
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} else {
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imr.imr_interface.s_addr = htonl(INADDR_ANY);
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}
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ret = setsockopt(fd, IPPROTO_IP, IP_ADD_MEMBERSHIP,
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&imr, sizeof(struct ip_mreq));
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if (ret < 0) {
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error_setg_errno(errp, errno,
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"can't add socket to multicast group %s",
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inet_ntoa(imr.imr_multiaddr));
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goto fail;
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}
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/* Force mcast msgs to loopback (eg. several QEMUs in same host */
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loop = 1;
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ret = setsockopt(fd, IPPROTO_IP, IP_MULTICAST_LOOP,
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&loop, sizeof(loop));
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if (ret < 0) {
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error_setg_errno(errp, errno,
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"can't force multicast message to loopback");
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goto fail;
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}
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/* If a bind address is given, only send packets from that address */
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if (localaddr != NULL) {
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ret = setsockopt(fd, IPPROTO_IP, IP_MULTICAST_IF,
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localaddr, sizeof(*localaddr));
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if (ret < 0) {
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error_setg_errno(errp, errno,
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"can't set the default network send interface");
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goto fail;
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}
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}
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qemu_socket_set_nonblock(fd);
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return fd;
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fail:
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if (fd >= 0)
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close(fd);
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return -1;
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}
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static void net_socket_cleanup(NetClientState *nc)
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{
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NetSocketState *s = DO_UPCAST(NetSocketState, nc, nc);
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if (s->fd != -1) {
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net_socket_read_poll(s, false);
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net_socket_write_poll(s, false);
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close(s->fd);
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s->fd = -1;
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}
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if (s->listen_fd != -1) {
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qemu_set_fd_handler(s->listen_fd, NULL, NULL, NULL);
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close(s->listen_fd);
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s->listen_fd = -1;
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}
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}
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static NetClientInfo net_dgram_socket_info = {
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.type = NET_CLIENT_DRIVER_SOCKET,
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.size = sizeof(NetSocketState),
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.receive = net_socket_receive_dgram,
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.cleanup = net_socket_cleanup,
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};
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static NetSocketState *net_socket_fd_init_dgram(NetClientState *peer,
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const char *model,
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const char *name,
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int fd, int is_connected,
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const char *mcast,
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Error **errp)
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{
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struct sockaddr_in saddr;
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int newfd;
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NetClientState *nc;
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NetSocketState *s;
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SocketAddress *sa;
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SocketAddressType sa_type;
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sa = socket_local_address(fd, errp);
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if (!sa) {
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return NULL;
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}
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sa_type = sa->type;
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qapi_free_SocketAddress(sa);
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/* fd passed: multicast: "learn" dgram_dst address from bound address and save it
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* Because this may be "shared" socket from a "master" process, datagrams would be recv()
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* by ONLY ONE process: we must "clone" this dgram socket --jjo
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*/
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if (is_connected && mcast != NULL) {
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if (parse_host_port(&saddr, mcast, errp) < 0) {
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goto err;
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}
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/* must be bound */
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if (saddr.sin_addr.s_addr == 0) {
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error_setg(errp, "can't setup multicast destination address");
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goto err;
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}
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/* clone dgram socket */
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newfd = net_socket_mcast_create(&saddr, NULL, errp);
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if (newfd < 0) {
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goto err;
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}
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/* clone newfd to fd, close newfd */
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dup2(newfd, fd);
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close(newfd);
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}
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nc = qemu_new_net_client(&net_dgram_socket_info, peer, model, name);
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s = DO_UPCAST(NetSocketState, nc, nc);
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s->fd = fd;
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s->listen_fd = -1;
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s->send_fn = net_socket_send_dgram;
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net_socket_rs_init(&s->rs, net_socket_rs_finalize, false);
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net_socket_read_poll(s, true);
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/* mcast: save bound address as dst */
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if (is_connected && mcast != NULL) {
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s->dgram_dst = saddr;
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qemu_set_info_str(nc, "socket: fd=%d (cloned mcast=%s:%d)", fd,
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inet_ntoa(saddr.sin_addr), ntohs(saddr.sin_port));
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} else {
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if (sa_type == SOCKET_ADDRESS_TYPE_UNIX) {
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s->dgram_dst.sin_family = AF_UNIX;
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}
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qemu_set_info_str(nc, "socket: fd=%d %s", fd,
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SocketAddressType_str(sa_type));
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}
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return s;
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err:
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close(fd);
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return NULL;
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}
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static void net_socket_connect(void *opaque)
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{
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NetSocketState *s = opaque;
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s->send_fn = net_socket_send;
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net_socket_read_poll(s, true);
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}
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static NetClientInfo net_socket_info = {
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.type = NET_CLIENT_DRIVER_SOCKET,
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.size = sizeof(NetSocketState),
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.receive = net_socket_receive,
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.cleanup = net_socket_cleanup,
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};
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static NetSocketState *net_socket_fd_init_stream(NetClientState *peer,
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const char *model,
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const char *name,
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int fd, int is_connected)
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{
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NetClientState *nc;
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NetSocketState *s;
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nc = qemu_new_net_client(&net_socket_info, peer, model, name);
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qemu_set_info_str(nc, "socket: fd=%d", fd);
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s = DO_UPCAST(NetSocketState, nc, nc);
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s->fd = fd;
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s->listen_fd = -1;
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net_socket_rs_init(&s->rs, net_socket_rs_finalize, false);
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/* Disable Nagle algorithm on TCP sockets to reduce latency */
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socket_set_nodelay(fd);
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if (is_connected) {
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net_socket_connect(s);
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} else {
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qemu_set_fd_handler(s->fd, NULL, net_socket_connect, s);
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}
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return s;
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}
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static int net_socket_fd_check(int fd, Error **errp)
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{
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int so_type, optlen = sizeof(so_type);
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if (getsockopt(fd, SOL_SOCKET, SO_TYPE, (char *)&so_type,
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(socklen_t *)&optlen) < 0) {
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error_setg(errp, "can't get socket option SO_TYPE");
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return -1;
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}
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if (so_type != SOCK_DGRAM && so_type != SOCK_STREAM) {
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error_setg(errp, "socket type=%d for fd=%d must be either"
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" SOCK_DGRAM or SOCK_STREAM", so_type, fd);
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return -1;
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}
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return so_type;
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}
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static void net_socket_accept(void *opaque)
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{
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NetSocketState *s = opaque;
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struct sockaddr_in saddr;
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socklen_t len;
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int fd;
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for(;;) {
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len = sizeof(saddr);
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fd = qemu_accept(s->listen_fd, (struct sockaddr *)&saddr, &len);
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if (fd < 0 && errno != EINTR) {
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return;
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} else if (fd >= 0) {
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qemu_set_fd_handler(s->listen_fd, NULL, NULL, NULL);
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break;
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}
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}
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s->fd = fd;
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s->nc.link_down = false;
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net_socket_connect(s);
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qemu_set_info_str(&s->nc, "socket: connection from %s:%d",
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inet_ntoa(saddr.sin_addr), ntohs(saddr.sin_port));
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}
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static int net_socket_listen_init(NetClientState *peer,
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const char *model,
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const char *name,
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const char *host_str,
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Error **errp)
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{
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NetClientState *nc;
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NetSocketState *s;
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struct sockaddr_in saddr;
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int fd, ret;
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if (parse_host_port(&saddr, host_str, errp) < 0) {
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return -1;
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}
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fd = qemu_socket(PF_INET, SOCK_STREAM, 0);
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if (fd < 0) {
|
|
error_setg_errno(errp, errno, "can't create stream socket");
|
|
return -1;
|
|
}
|
|
qemu_socket_set_nonblock(fd);
|
|
|
|
socket_set_fast_reuse(fd);
|
|
|
|
ret = bind(fd, (struct sockaddr *)&saddr, sizeof(saddr));
|
|
if (ret < 0) {
|
|
error_setg_errno(errp, errno, "can't bind ip=%s to socket",
|
|
inet_ntoa(saddr.sin_addr));
|
|
close(fd);
|
|
return -1;
|
|
}
|
|
ret = listen(fd, 0);
|
|
if (ret < 0) {
|
|
error_setg_errno(errp, errno, "can't listen on socket");
|
|
close(fd);
|
|
return -1;
|
|
}
|
|
|
|
nc = qemu_new_net_client(&net_socket_info, peer, model, name);
|
|
s = DO_UPCAST(NetSocketState, nc, nc);
|
|
s->fd = -1;
|
|
s->listen_fd = fd;
|
|
s->nc.link_down = true;
|
|
net_socket_rs_init(&s->rs, net_socket_rs_finalize, false);
|
|
|
|
qemu_set_fd_handler(s->listen_fd, net_socket_accept, NULL, s);
|
|
return 0;
|
|
}
|
|
|
|
static int net_socket_connect_init(NetClientState *peer,
|
|
const char *model,
|
|
const char *name,
|
|
const char *host_str,
|
|
Error **errp)
|
|
{
|
|
NetSocketState *s;
|
|
int fd, connected, ret;
|
|
struct sockaddr_in saddr;
|
|
|
|
if (parse_host_port(&saddr, host_str, errp) < 0) {
|
|
return -1;
|
|
}
|
|
|
|
fd = qemu_socket(PF_INET, SOCK_STREAM, 0);
|
|
if (fd < 0) {
|
|
error_setg_errno(errp, errno, "can't create stream socket");
|
|
return -1;
|
|
}
|
|
qemu_socket_set_nonblock(fd);
|
|
|
|
connected = 0;
|
|
for(;;) {
|
|
ret = connect(fd, (struct sockaddr *)&saddr, sizeof(saddr));
|
|
if (ret < 0) {
|
|
if (errno == EINTR || errno == EWOULDBLOCK) {
|
|
/* continue */
|
|
} else if (errno == EINPROGRESS ||
|
|
errno == EALREADY) {
|
|
break;
|
|
} else {
|
|
error_setg_errno(errp, errno, "can't connect socket");
|
|
close(fd);
|
|
return -1;
|
|
}
|
|
} else {
|
|
connected = 1;
|
|
break;
|
|
}
|
|
}
|
|
s = net_socket_fd_init_stream(peer, model, name, fd, connected);
|
|
if (!s) {
|
|
return -1;
|
|
}
|
|
|
|
qemu_set_info_str(&s->nc, "socket: connect to %s:%d",
|
|
inet_ntoa(saddr.sin_addr), ntohs(saddr.sin_port));
|
|
return 0;
|
|
}
|
|
|
|
static int net_socket_mcast_init(NetClientState *peer,
|
|
const char *model,
|
|
const char *name,
|
|
const char *host_str,
|
|
const char *localaddr_str,
|
|
Error **errp)
|
|
{
|
|
NetSocketState *s;
|
|
int fd;
|
|
struct sockaddr_in saddr;
|
|
struct in_addr localaddr, *param_localaddr;
|
|
|
|
if (parse_host_port(&saddr, host_str, errp) < 0) {
|
|
return -1;
|
|
}
|
|
|
|
if (localaddr_str != NULL) {
|
|
if (inet_aton(localaddr_str, &localaddr) == 0) {
|
|
error_setg(errp, "localaddr '%s' is not a valid IPv4 address",
|
|
localaddr_str);
|
|
return -1;
|
|
}
|
|
param_localaddr = &localaddr;
|
|
} else {
|
|
param_localaddr = NULL;
|
|
}
|
|
|
|
fd = net_socket_mcast_create(&saddr, param_localaddr, errp);
|
|
if (fd < 0) {
|
|
return -1;
|
|
}
|
|
|
|
s = net_socket_fd_init_dgram(peer, model, name, fd, 0, NULL, errp);
|
|
if (!s) {
|
|
return -1;
|
|
}
|
|
|
|
s->dgram_dst = saddr;
|
|
|
|
qemu_set_info_str(&s->nc, "socket: mcast=%s:%d",
|
|
inet_ntoa(saddr.sin_addr), ntohs(saddr.sin_port));
|
|
return 0;
|
|
|
|
}
|
|
|
|
static int net_socket_udp_init(NetClientState *peer,
|
|
const char *model,
|
|
const char *name,
|
|
const char *rhost,
|
|
const char *lhost,
|
|
Error **errp)
|
|
{
|
|
NetSocketState *s;
|
|
int fd, ret;
|
|
struct sockaddr_in laddr, raddr;
|
|
|
|
if (parse_host_port(&laddr, lhost, errp) < 0) {
|
|
return -1;
|
|
}
|
|
|
|
if (parse_host_port(&raddr, rhost, errp) < 0) {
|
|
return -1;
|
|
}
|
|
|
|
fd = qemu_socket(PF_INET, SOCK_DGRAM, 0);
|
|
if (fd < 0) {
|
|
error_setg_errno(errp, errno, "can't create datagram socket");
|
|
return -1;
|
|
}
|
|
|
|
ret = socket_set_fast_reuse(fd);
|
|
if (ret < 0) {
|
|
error_setg_errno(errp, errno,
|
|
"can't set socket option SO_REUSEADDR");
|
|
close(fd);
|
|
return -1;
|
|
}
|
|
ret = bind(fd, (struct sockaddr *)&laddr, sizeof(laddr));
|
|
if (ret < 0) {
|
|
error_setg_errno(errp, errno, "can't bind ip=%s to socket",
|
|
inet_ntoa(laddr.sin_addr));
|
|
close(fd);
|
|
return -1;
|
|
}
|
|
qemu_socket_set_nonblock(fd);
|
|
|
|
s = net_socket_fd_init_dgram(peer, model, name, fd, 0, NULL, errp);
|
|
if (!s) {
|
|
return -1;
|
|
}
|
|
|
|
s->dgram_dst = raddr;
|
|
|
|
qemu_set_info_str(&s->nc, "socket: udp=%s:%d", inet_ntoa(raddr.sin_addr),
|
|
ntohs(raddr.sin_port));
|
|
return 0;
|
|
}
|
|
|
|
int net_init_socket(const Netdev *netdev, const char *name,
|
|
NetClientState *peer, Error **errp)
|
|
{
|
|
const NetdevSocketOptions *sock;
|
|
|
|
assert(netdev->type == NET_CLIENT_DRIVER_SOCKET);
|
|
sock = &netdev->u.socket;
|
|
|
|
if (!!sock->fd + !!sock->listen + !!sock->connect + !!sock->mcast +
|
|
!!sock->udp != 1) {
|
|
error_setg(errp, "exactly one of listen=, connect=, mcast= or udp="
|
|
" is required");
|
|
return -1;
|
|
}
|
|
|
|
if (sock->localaddr && !sock->mcast && !sock->udp) {
|
|
error_setg(errp, "localaddr= is only valid with mcast= or udp=");
|
|
return -1;
|
|
}
|
|
|
|
if (sock->fd) {
|
|
int fd, ret, so_type;
|
|
|
|
fd = monitor_fd_param(monitor_cur(), sock->fd, errp);
|
|
if (fd == -1) {
|
|
return -1;
|
|
}
|
|
so_type = net_socket_fd_check(fd, errp);
|
|
if (so_type < 0) {
|
|
return -1;
|
|
}
|
|
ret = qemu_socket_try_set_nonblock(fd);
|
|
if (ret < 0) {
|
|
error_setg_errno(errp, -ret, "%s: Can't use file descriptor %d",
|
|
name, fd);
|
|
return -1;
|
|
}
|
|
switch (so_type) {
|
|
case SOCK_DGRAM:
|
|
if (!net_socket_fd_init_dgram(peer, "socket", name, fd, 1,
|
|
sock->mcast, errp)) {
|
|
return -1;
|
|
}
|
|
break;
|
|
case SOCK_STREAM:
|
|
if (!net_socket_fd_init_stream(peer, "socket", name, fd, 1)) {
|
|
return -1;
|
|
}
|
|
break;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
if (sock->listen) {
|
|
if (net_socket_listen_init(peer, "socket", name, sock->listen, errp)
|
|
< 0) {
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
if (sock->connect) {
|
|
if (net_socket_connect_init(peer, "socket", name, sock->connect, errp)
|
|
< 0) {
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
if (sock->mcast) {
|
|
/* if sock->localaddr is missing, it has been initialized to "all bits
|
|
* zero" */
|
|
if (net_socket_mcast_init(peer, "socket", name, sock->mcast,
|
|
sock->localaddr, errp) < 0) {
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
assert(sock->udp);
|
|
if (!sock->localaddr) {
|
|
error_setg(errp, "localaddr= is mandatory with udp=");
|
|
return -1;
|
|
}
|
|
if (net_socket_udp_init(peer, "socket", name, sock->udp, sock->localaddr,
|
|
errp) < 0) {
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|