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https://gitlab.com/qemu-project/qemu.git
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46cec74c1b
We want to make use of the Error object to report fdset errors from qemu_open_internal() and passing the error pointer to qemu_open_old() would require changing all callers. Move the file channel to the new API instead. Reviewed-by: Daniel P. Berrangé <berrange@redhat.com> Reviewed-by: Peter Xu <peterx@redhat.com> Signed-off-by: Fabiano Rosas <farosas@suse.de>
325 lines
9.0 KiB
C
325 lines
9.0 KiB
C
/*
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* QEMU I/O channels files driver
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*
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* Copyright (c) 2015 Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include "qemu/osdep.h"
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#include "io/channel-file.h"
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#include "io/channel-util.h"
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#include "io/channel-watch.h"
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#include "qapi/error.h"
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#include "qemu/module.h"
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#include "qemu/sockets.h"
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#include "trace.h"
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QIOChannelFile *
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qio_channel_file_new_fd(int fd)
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{
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QIOChannelFile *ioc;
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ioc = QIO_CHANNEL_FILE(object_new(TYPE_QIO_CHANNEL_FILE));
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ioc->fd = fd;
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if (lseek(fd, 0, SEEK_CUR) != (off_t)-1) {
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qio_channel_set_feature(QIO_CHANNEL(ioc), QIO_CHANNEL_FEATURE_SEEKABLE);
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}
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trace_qio_channel_file_new_fd(ioc, fd);
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return ioc;
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}
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QIOChannelFile *
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qio_channel_file_new_dupfd(int fd, Error **errp)
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{
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int newfd = dup(fd);
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if (newfd < 0) {
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error_setg_errno(errp, errno, "Could not dup FD %d", fd);
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return NULL;
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}
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return qio_channel_file_new_fd(newfd);
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}
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QIOChannelFile *
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qio_channel_file_new_path(const char *path,
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int flags,
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mode_t mode,
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Error **errp)
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{
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QIOChannelFile *ioc;
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ioc = QIO_CHANNEL_FILE(object_new(TYPE_QIO_CHANNEL_FILE));
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if (flags & O_CREAT) {
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ioc->fd = qemu_create(path, flags & ~O_CREAT, mode, errp);
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} else {
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ioc->fd = qemu_open(path, flags, errp);
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}
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if (ioc->fd < 0) {
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object_unref(OBJECT(ioc));
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return NULL;
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}
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if (lseek(ioc->fd, 0, SEEK_CUR) != (off_t)-1) {
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qio_channel_set_feature(QIO_CHANNEL(ioc), QIO_CHANNEL_FEATURE_SEEKABLE);
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}
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trace_qio_channel_file_new_path(ioc, path, flags, mode, ioc->fd);
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return ioc;
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}
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static void qio_channel_file_init(Object *obj)
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{
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QIOChannelFile *ioc = QIO_CHANNEL_FILE(obj);
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ioc->fd = -1;
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}
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static void qio_channel_file_finalize(Object *obj)
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{
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QIOChannelFile *ioc = QIO_CHANNEL_FILE(obj);
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if (ioc->fd != -1) {
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qemu_close(ioc->fd);
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ioc->fd = -1;
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}
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}
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static ssize_t qio_channel_file_readv(QIOChannel *ioc,
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const struct iovec *iov,
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size_t niov,
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int **fds,
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size_t *nfds,
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int flags,
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Error **errp)
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{
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QIOChannelFile *fioc = QIO_CHANNEL_FILE(ioc);
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ssize_t ret;
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retry:
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ret = readv(fioc->fd, iov, niov);
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if (ret < 0) {
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if (errno == EAGAIN) {
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return QIO_CHANNEL_ERR_BLOCK;
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}
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if (errno == EINTR) {
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goto retry;
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}
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error_setg_errno(errp, errno,
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"Unable to read from file");
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return -1;
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}
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return ret;
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}
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static ssize_t qio_channel_file_writev(QIOChannel *ioc,
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const struct iovec *iov,
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size_t niov,
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int *fds,
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size_t nfds,
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int flags,
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Error **errp)
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{
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QIOChannelFile *fioc = QIO_CHANNEL_FILE(ioc);
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ssize_t ret;
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retry:
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ret = writev(fioc->fd, iov, niov);
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if (ret <= 0) {
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if (errno == EAGAIN) {
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return QIO_CHANNEL_ERR_BLOCK;
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}
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if (errno == EINTR) {
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goto retry;
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}
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error_setg_errno(errp, errno,
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"Unable to write to file");
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return -1;
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}
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return ret;
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}
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#ifdef CONFIG_PREADV
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static ssize_t qio_channel_file_preadv(QIOChannel *ioc,
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const struct iovec *iov,
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size_t niov,
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off_t offset,
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Error **errp)
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{
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QIOChannelFile *fioc = QIO_CHANNEL_FILE(ioc);
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ssize_t ret;
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retry:
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ret = preadv(fioc->fd, iov, niov, offset);
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if (ret < 0) {
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if (errno == EAGAIN) {
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return QIO_CHANNEL_ERR_BLOCK;
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}
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if (errno == EINTR) {
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goto retry;
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}
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error_setg_errno(errp, errno, "Unable to read from file");
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return -1;
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}
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return ret;
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}
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static ssize_t qio_channel_file_pwritev(QIOChannel *ioc,
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const struct iovec *iov,
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size_t niov,
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off_t offset,
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Error **errp)
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{
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QIOChannelFile *fioc = QIO_CHANNEL_FILE(ioc);
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ssize_t ret;
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retry:
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ret = pwritev(fioc->fd, iov, niov, offset);
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if (ret <= 0) {
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if (errno == EAGAIN) {
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return QIO_CHANNEL_ERR_BLOCK;
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}
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if (errno == EINTR) {
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goto retry;
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}
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error_setg_errno(errp, errno, "Unable to write to file");
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return -1;
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}
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return ret;
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}
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#endif /* CONFIG_PREADV */
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static int qio_channel_file_set_blocking(QIOChannel *ioc,
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bool enabled,
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Error **errp)
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{
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#ifdef WIN32
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/* not implemented */
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error_setg_errno(errp, errno, "Failed to set FD nonblocking");
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return -1;
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#else
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QIOChannelFile *fioc = QIO_CHANNEL_FILE(ioc);
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if (!g_unix_set_fd_nonblocking(fioc->fd, !enabled, NULL)) {
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error_setg_errno(errp, errno, "Failed to set FD nonblocking");
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return -1;
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}
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return 0;
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#endif
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}
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static off_t qio_channel_file_seek(QIOChannel *ioc,
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off_t offset,
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int whence,
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Error **errp)
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{
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QIOChannelFile *fioc = QIO_CHANNEL_FILE(ioc);
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off_t ret;
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ret = lseek(fioc->fd, offset, whence);
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if (ret == (off_t)-1) {
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error_setg_errno(errp, errno,
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"Unable to seek to offset %lld whence %d in file",
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(long long int)offset, whence);
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return -1;
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}
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return ret;
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}
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static int qio_channel_file_close(QIOChannel *ioc,
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Error **errp)
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{
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QIOChannelFile *fioc = QIO_CHANNEL_FILE(ioc);
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if (qemu_close(fioc->fd) < 0) {
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error_setg_errno(errp, errno,
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"Unable to close file");
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return -1;
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}
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fioc->fd = -1;
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return 0;
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}
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static void qio_channel_file_set_aio_fd_handler(QIOChannel *ioc,
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AioContext *read_ctx,
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IOHandler *io_read,
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AioContext *write_ctx,
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IOHandler *io_write,
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void *opaque)
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{
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QIOChannelFile *fioc = QIO_CHANNEL_FILE(ioc);
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qio_channel_util_set_aio_fd_handler(fioc->fd, read_ctx, io_read,
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fioc->fd, write_ctx, io_write,
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opaque);
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}
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static GSource *qio_channel_file_create_watch(QIOChannel *ioc,
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GIOCondition condition)
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{
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QIOChannelFile *fioc = QIO_CHANNEL_FILE(ioc);
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return qio_channel_create_fd_watch(ioc,
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fioc->fd,
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condition);
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}
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static void qio_channel_file_class_init(ObjectClass *klass,
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void *class_data G_GNUC_UNUSED)
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{
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QIOChannelClass *ioc_klass = QIO_CHANNEL_CLASS(klass);
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ioc_klass->io_writev = qio_channel_file_writev;
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ioc_klass->io_readv = qio_channel_file_readv;
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ioc_klass->io_set_blocking = qio_channel_file_set_blocking;
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#ifdef CONFIG_PREADV
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ioc_klass->io_pwritev = qio_channel_file_pwritev;
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ioc_klass->io_preadv = qio_channel_file_preadv;
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#endif
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ioc_klass->io_seek = qio_channel_file_seek;
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ioc_klass->io_close = qio_channel_file_close;
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ioc_klass->io_create_watch = qio_channel_file_create_watch;
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ioc_klass->io_set_aio_fd_handler = qio_channel_file_set_aio_fd_handler;
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}
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static const TypeInfo qio_channel_file_info = {
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.parent = TYPE_QIO_CHANNEL,
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.name = TYPE_QIO_CHANNEL_FILE,
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.instance_size = sizeof(QIOChannelFile),
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.instance_init = qio_channel_file_init,
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.instance_finalize = qio_channel_file_finalize,
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.class_init = qio_channel_file_class_init,
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};
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static void qio_channel_file_register_types(void)
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{
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type_register_static(&qio_channel_file_info);
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}
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type_init(qio_channel_file_register_types);
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