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authorDaniel P. Berrange <berrange@redhat.com>2015-02-27 18:25:25 +0000
committerDaniel P. Berrange <berrange@redhat.com>2015-12-18 12:18:31 +0000
commitd6e48869a41b61bb2f4eb0a787c08225630feb9e (patch)
tree9eb1ad774b0adb6055fc2e4440edb6929bc55725 /io
parent559607ea173a0003efda7f884bec73b242f923fb (diff)
downloadqemu-arm-d6e48869a41b61bb2f4eb0a787c08225630feb9e.tar.gz
io: add QIOChannelFile class
Add a QIOChannel subclass that is capable of operating on things that are files, such as plain files, pipes, character/block devices, but notably not sockets. Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Diffstat (limited to 'io')
-rw-r--r--io/Makefile.objs1
-rw-r--r--io/channel-file.c225
2 files changed, 226 insertions, 0 deletions
diff --git a/io/Makefile.objs b/io/Makefile.objs
index e9d77aaaa5..3d2f232480 100644
--- a/io/Makefile.objs
+++ b/io/Makefile.objs
@@ -1,4 +1,5 @@
io-obj-y = channel.o
+io-obj-y += channel-file.o
io-obj-y += channel-socket.o
io-obj-y += channel-watch.o
io-obj-y += task.o
diff --git a/io/channel-file.c b/io/channel-file.c
new file mode 100644
index 0000000000..13609005f9
--- /dev/null
+++ b/io/channel-file.c
@@ -0,0 +1,225 @@
+/*
+ * 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 "io/channel-file.h"
+#include "io/channel-watch.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 ||
+ errno == EWOULDBLOCK) {
+ 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 ||
+ errno == EWOULDBLOCK) {
+ 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 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;
+}
+
+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);