static int qio_channel_command_set_blocking(QIOChannel *ioc,
bool enabled,
Error **errp)
{
QIOChannelCommand *cioc = QIO_CHANNEL_COMMAND(ioc);
if (enabled) {
qemu_set_block(cioc->writefd);
qemu_set_block(cioc->readfd);
} else {
qemu_set_nonblock(cioc->writefd);
qemu_set_nonblock(cioc->readfd);
}
return 0;
}
static void nbd_teardown_connection(NbdClientSession *client)
{
struct nbd_request request = {
.type = NBD_CMD_DISC,
.from = 0,
.len = 0
};
nbd_send_request(client->sock, &request);
/* finish any pending coroutines */
shutdown(client->sock, 2);
nbd_recv_coroutines_enter_all(client);
qemu_aio_set_fd_handler(client->sock, NULL, NULL, NULL);
closesocket(client->sock);
client->sock = -1;
}
void nbd_client_session_close(NbdClientSession *client)
{
if (!client->bs) {
return;
}
nbd_teardown_connection(client);
client->bs = NULL;
}
int nbd_client_session_init(NbdClientSession *client, BlockDriverState *bs,
int sock, const char *export)
{
int ret;
/* NBD handshake */
logout("session init %s\n", export);
qemu_set_block(sock);
ret = nbd_receive_negotiate(sock, export,
&client->nbdflags, &client->size,
&client->blocksize);
if (ret < 0) {
logout("Failed to negotiate with the NBD server\n");
closesocket(sock);
return ret;
}
qemu_co_mutex_init(&client->send_mutex);
qemu_co_mutex_init(&client->free_sema);
client->bs = bs;
client->sock = sock;
/* Now that we're connected, set the socket to be non-blocking and
* kick the reply mechanism. */
qemu_set_nonblock(sock);
qemu_aio_set_fd_handler(sock, nbd_reply_ready, NULL, client);
logout("Established connection with NBD server\n");
return 0;
}
static ssize_t tcp_chr_recv(Chardev *chr, char *buf, size_t len)
{
SocketChardev *s = SOCKET_CHARDEV(chr);
struct iovec iov = { .iov_base = buf, .iov_len = len };
int ret;
size_t i;
int *msgfds = NULL;
size_t msgfds_num = 0;
if (qio_channel_has_feature(s->ioc, QIO_CHANNEL_FEATURE_FD_PASS)) {
ret = qio_channel_readv_full(s->ioc, &iov, 1,
&msgfds, &msgfds_num,
NULL);
} else {
ret = qio_channel_readv_full(s->ioc, &iov, 1,
NULL, NULL,
NULL);
}
if (ret == QIO_CHANNEL_ERR_BLOCK) {
errno = EAGAIN;
ret = -1;
} else if (ret == -1) {
errno = EIO;
}
if (msgfds_num) {
/* close and clean read_msgfds */
for (i = 0; i < s->read_msgfds_num; i++) {
close(s->read_msgfds[i]);
}
if (s->read_msgfds_num) {
g_free(s->read_msgfds);
}
s->read_msgfds = msgfds;
s->read_msgfds_num = msgfds_num;
}
for (i = 0; i < s->read_msgfds_num; i++) {
int fd = s->read_msgfds[i];
if (fd < 0) {
continue;
}
/* O_NONBLOCK is preserved across SCM_RIGHTS so reset it */
qemu_set_block(fd);
#ifndef MSG_CMSG_CLOEXEC
qemu_set_cloexec(fd);
#endif
}
return ret;
}
static int qio_channel_file_set_blocking(QIOChannel *ioc,
bool enabled,
Error **errp)
{
QIOChannelFile *fioc = QIO_CHANNEL_FILE(ioc);
if (enabled) {
qemu_set_block(fioc->fd);
} else {
qemu_set_nonblock(fioc->fd);
}
return 0;
}
static int
qio_channel_socket_set_blocking(QIOChannel *ioc,
bool enabled,
Error **errp)
{
QIOChannelSocket *sioc = QIO_CHANNEL_SOCKET(ioc);
if (enabled) {
qemu_set_block(sioc->fd);
} else {
qemu_set_nonblock(sioc->fd);
}
return 0;
}
static void unix_wait_for_connect(int fd, void *opaque)
{
MigrationState *s = opaque;
if (fd < 0) {
DPRINTF("migrate connect error\n");
s->fd = -1;
migrate_fd_error(s);
} else {
DPRINTF("migrate connect success\n");
s->fd = fd;
qemu_set_block(s->fd);
migrate_fd_connect(s);
}
}
void nbd_client_close(BlockDriverState *bs)
{
NbdClientSession *client = nbd_get_client_session(bs);
struct nbd_request request = {
.type = NBD_CMD_DISC,
.from = 0,
.len = 0
};
if (client->sock == -1) {
return;
}
nbd_send_request(client->sock, &request);
nbd_teardown_connection(bs);
}
int nbd_client_init(BlockDriverState *bs, int sock, const char *export,
Error **errp)
{
NbdClientSession *client = nbd_get_client_session(bs);
int ret;
/* NBD handshake */
logout("session init %s\n", export);
qemu_set_block(sock);
ret = nbd_receive_negotiate(sock, export,
&client->nbdflags, &client->size,
&client->blocksize, errp);
if (ret < 0) {
logout("Failed to negotiate with the NBD server\n");
closesocket(sock);
return ret;
}
qemu_co_mutex_init(&client->send_mutex);
qemu_co_mutex_init(&client->free_sema);
client->sock = sock;
/* Now that we're connected, set the socket to be non-blocking and
* kick the reply mechanism. */
qemu_set_nonblock(sock);
nbd_client_attach_aio_context(bs, bdrv_get_aio_context(bs));
logout("Established connection with NBD server\n");
return 0;
}
QEMUFile *qemu_fopen_socket(int fd, const char *mode)
{
QEMUFileSocket *s;
if (qemu_file_mode_is_not_valid(mode)) {
return NULL;
}
s = g_malloc0(sizeof(QEMUFileSocket));
s->fd = fd;
if (mode[0] == 'w') {
qemu_set_block(s->fd);
s->file = qemu_fopen_ops(s, &socket_write_ops);
} else {
s->file = qemu_fopen_ops(s, &socket_read_ops);
}
return s->file;
}
static void qio_channel_socket_copy_fds(struct msghdr *msg,
int **fds, size_t *nfds)
{
struct cmsghdr *cmsg;
*nfds = 0;
*fds = NULL;
for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
int fd_size, i;
int gotfds;
if (cmsg->cmsg_len < CMSG_LEN(sizeof(int)) ||
cmsg->cmsg_level != SOL_SOCKET ||
cmsg->cmsg_type != SCM_RIGHTS) {
continue;
}
fd_size = cmsg->cmsg_len - CMSG_LEN(0);
if (!fd_size) {
continue;
}
gotfds = fd_size / sizeof(int);
*fds = g_renew(int, *fds, *nfds + gotfds);
memcpy(*fds + *nfds, CMSG_DATA(cmsg), fd_size);
for (i = 0; i < gotfds; i++) {
int fd = (*fds)[*nfds + i];
if (fd < 0) {
continue;
}
/* O_NONBLOCK is preserved across SCM_RIGHTS so reset it */
qemu_set_block(fd);
#ifndef MSG_CMSG_CLOEXEC
qemu_set_cloexec(fd);
#endif
}
*nfds += gotfds;
}
}
static int
qio_channel_socket_set_blocking(QIOChannel *ioc,
bool enabled,
Error **errp)
{
QIOChannelSocket *sioc = QIO_CHANNEL_SOCKET(ioc);
if (enabled) {
qemu_set_block(sioc->fd);
} else {
qemu_set_nonblock(sioc->fd);
#ifdef WIN32
WSAEventSelect(sioc->fd, ioc->event,
FD_READ | FD_ACCEPT | FD_CLOSE |
FD_CONNECT | FD_WRITE | FD_OOB);
#endif
}
return 0;
}