mirror of
https://github.com/xemu-project/xemu.git
synced 2024-12-13 23:08:57 +00:00
bf88c1247f
This is in preparation for making qio_channel_yield work on AioContexts other than the main one. Reviewed-by: Daniel P. Berrange <berrange@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Fam Zheng <famz@redhat.com> Message-id: 20170213135235.12274-6-pbonzini@redhat.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
237 lines
6.5 KiB
C
237 lines
6.5 KiB
C
/*
|
|
* QEMU I/O channels files driver
|
|
*
|
|
* Copyright (c) 2015 Red Hat, Inc.
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2 of the License, or (at your option) any later version.
|
|
*
|
|
* This library 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
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
|
|
*
|
|
*/
|
|
|
|
#include "qemu/osdep.h"
|
|
#include "io/channel-file.h"
|
|
#include "io/channel-watch.h"
|
|
#include "qapi/error.h"
|
|
#include "qemu/sockets.h"
|
|
#include "trace.h"
|
|
|
|
QIOChannelFile *
|
|
qio_channel_file_new_fd(int fd)
|
|
{
|
|
QIOChannelFile *ioc;
|
|
|
|
ioc = QIO_CHANNEL_FILE(object_new(TYPE_QIO_CHANNEL_FILE));
|
|
|
|
ioc->fd = fd;
|
|
|
|
trace_qio_channel_file_new_fd(ioc, fd);
|
|
|
|
return ioc;
|
|
}
|
|
|
|
|
|
QIOChannelFile *
|
|
qio_channel_file_new_path(const char *path,
|
|
int flags,
|
|
mode_t mode,
|
|
Error **errp)
|
|
{
|
|
QIOChannelFile *ioc;
|
|
|
|
ioc = QIO_CHANNEL_FILE(object_new(TYPE_QIO_CHANNEL_FILE));
|
|
|
|
if (flags & O_WRONLY) {
|
|
ioc->fd = open(path, flags, mode);
|
|
} else {
|
|
ioc->fd = open(path, flags);
|
|
}
|
|
if (ioc->fd < 0) {
|
|
object_unref(OBJECT(ioc));
|
|
error_setg_errno(errp, errno,
|
|
"Unable to open %s", path);
|
|
return NULL;
|
|
}
|
|
|
|
trace_qio_channel_file_new_path(ioc, path, flags, mode, ioc->fd);
|
|
|
|
return ioc;
|
|
}
|
|
|
|
|
|
static void qio_channel_file_init(Object *obj)
|
|
{
|
|
QIOChannelFile *ioc = QIO_CHANNEL_FILE(obj);
|
|
ioc->fd = -1;
|
|
}
|
|
|
|
static void qio_channel_file_finalize(Object *obj)
|
|
{
|
|
QIOChannelFile *ioc = QIO_CHANNEL_FILE(obj);
|
|
if (ioc->fd != -1) {
|
|
close(ioc->fd);
|
|
ioc->fd = -1;
|
|
}
|
|
}
|
|
|
|
|
|
static ssize_t qio_channel_file_readv(QIOChannel *ioc,
|
|
const struct iovec *iov,
|
|
size_t niov,
|
|
int **fds,
|
|
size_t *nfds,
|
|
Error **errp)
|
|
{
|
|
QIOChannelFile *fioc = QIO_CHANNEL_FILE(ioc);
|
|
ssize_t ret;
|
|
|
|
retry:
|
|
ret = readv(fioc->fd, iov, niov);
|
|
if (ret < 0) {
|
|
if (errno == EAGAIN) {
|
|
return QIO_CHANNEL_ERR_BLOCK;
|
|
}
|
|
if (errno == EINTR) {
|
|
goto retry;
|
|
}
|
|
|
|
error_setg_errno(errp, errno,
|
|
"Unable to read from file");
|
|
return -1;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t qio_channel_file_writev(QIOChannel *ioc,
|
|
const struct iovec *iov,
|
|
size_t niov,
|
|
int *fds,
|
|
size_t nfds,
|
|
Error **errp)
|
|
{
|
|
QIOChannelFile *fioc = QIO_CHANNEL_FILE(ioc);
|
|
ssize_t ret;
|
|
|
|
retry:
|
|
ret = writev(fioc->fd, iov, niov);
|
|
if (ret <= 0) {
|
|
if (errno == EAGAIN) {
|
|
return QIO_CHANNEL_ERR_BLOCK;
|
|
}
|
|
if (errno == EINTR) {
|
|
goto retry;
|
|
}
|
|
error_setg_errno(errp, errno,
|
|
"Unable to write to file");
|
|
return -1;
|
|
}
|
|
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 off_t qio_channel_file_seek(QIOChannel *ioc,
|
|
off_t offset,
|
|
int whence,
|
|
Error **errp)
|
|
{
|
|
QIOChannelFile *fioc = QIO_CHANNEL_FILE(ioc);
|
|
off_t ret;
|
|
|
|
ret = lseek(fioc->fd, offset, whence);
|
|
if (ret == (off_t)-1) {
|
|
error_setg_errno(errp, errno,
|
|
"Unable to seek to offset %lld whence %d in file",
|
|
(long long int)offset, whence);
|
|
return -1;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
|
|
static int qio_channel_file_close(QIOChannel *ioc,
|
|
Error **errp)
|
|
{
|
|
QIOChannelFile *fioc = QIO_CHANNEL_FILE(ioc);
|
|
|
|
if (close(fioc->fd) < 0) {
|
|
error_setg_errno(errp, errno,
|
|
"Unable to close file");
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
static void qio_channel_file_set_aio_fd_handler(QIOChannel *ioc,
|
|
AioContext *ctx,
|
|
IOHandler *io_read,
|
|
IOHandler *io_write,
|
|
void *opaque)
|
|
{
|
|
QIOChannelFile *fioc = QIO_CHANNEL_FILE(ioc);
|
|
aio_set_fd_handler(ctx, fioc->fd, false, io_read, io_write, NULL, opaque);
|
|
}
|
|
|
|
static GSource *qio_channel_file_create_watch(QIOChannel *ioc,
|
|
GIOCondition condition)
|
|
{
|
|
QIOChannelFile *fioc = QIO_CHANNEL_FILE(ioc);
|
|
return qio_channel_create_fd_watch(ioc,
|
|
fioc->fd,
|
|
condition);
|
|
}
|
|
|
|
static void qio_channel_file_class_init(ObjectClass *klass,
|
|
void *class_data G_GNUC_UNUSED)
|
|
{
|
|
QIOChannelClass *ioc_klass = QIO_CHANNEL_CLASS(klass);
|
|
|
|
ioc_klass->io_writev = qio_channel_file_writev;
|
|
ioc_klass->io_readv = qio_channel_file_readv;
|
|
ioc_klass->io_set_blocking = qio_channel_file_set_blocking;
|
|
ioc_klass->io_seek = qio_channel_file_seek;
|
|
ioc_klass->io_close = qio_channel_file_close;
|
|
ioc_klass->io_create_watch = qio_channel_file_create_watch;
|
|
ioc_klass->io_set_aio_fd_handler = qio_channel_file_set_aio_fd_handler;
|
|
}
|
|
|
|
static const TypeInfo qio_channel_file_info = {
|
|
.parent = TYPE_QIO_CHANNEL,
|
|
.name = TYPE_QIO_CHANNEL_FILE,
|
|
.instance_size = sizeof(QIOChannelFile),
|
|
.instance_init = qio_channel_file_init,
|
|
.instance_finalize = qio_channel_file_finalize,
|
|
.class_init = qio_channel_file_class_init,
|
|
};
|
|
|
|
static void qio_channel_file_register_types(void)
|
|
{
|
|
type_register_static(&qio_channel_file_info);
|
|
}
|
|
|
|
type_init(qio_channel_file_register_types);
|