#include "qemu/osdep.h"
#include "io/channel.h"
-#include "qemu/coroutine.h"
+#include "qapi/error.h"
+#include "qemu/main-loop.h"
+#include "qemu/module.h"
+#include "qemu/iov.h"
bool qio_channel_has_feature(QIOChannel *ioc,
QIOChannelFeature feature)
}
+void qio_channel_set_feature(QIOChannel *ioc,
+ QIOChannelFeature feature)
+{
+ ioc->features |= (1 << feature);
+}
+
+
+void qio_channel_set_name(QIOChannel *ioc,
+ const char *name)
+{
+ g_free(ioc->name);
+ ioc->name = g_strdup(name);
+}
+
+
ssize_t qio_channel_readv_full(QIOChannel *ioc,
const struct iovec *iov,
size_t niov,
QIOChannelClass *klass = QIO_CHANNEL_GET_CLASS(ioc);
if ((fds || nfds) &&
- !(ioc->features & (1 << QIO_CHANNEL_FEATURE_FD_PASS))) {
+ !qio_channel_has_feature(ioc, QIO_CHANNEL_FEATURE_FD_PASS)) {
error_setg_errno(errp, EINVAL,
"Channel does not support file descriptor passing");
return -1;
QIOChannelClass *klass = QIO_CHANNEL_GET_CLASS(ioc);
if ((fds || nfds) &&
- !(ioc->features & (1 << QIO_CHANNEL_FEATURE_FD_PASS))) {
+ !qio_channel_has_feature(ioc, QIO_CHANNEL_FEATURE_FD_PASS)) {
error_setg_errno(errp, EINVAL,
"Channel does not support file descriptor passing");
return -1;
}
+int qio_channel_readv_all_eof(QIOChannel *ioc,
+ const struct iovec *iov,
+ size_t niov,
+ Error **errp)
+{
+ int ret = -1;
+ struct iovec *local_iov = g_new(struct iovec, niov);
+ struct iovec *local_iov_head = local_iov;
+ unsigned int nlocal_iov = niov;
+ bool partial = false;
+
+ nlocal_iov = iov_copy(local_iov, nlocal_iov,
+ iov, niov,
+ 0, iov_size(iov, niov));
+
+ while (nlocal_iov > 0) {
+ ssize_t len;
+ len = qio_channel_readv(ioc, local_iov, nlocal_iov, errp);
+ if (len == QIO_CHANNEL_ERR_BLOCK) {
+ if (qemu_in_coroutine()) {
+ qio_channel_yield(ioc, G_IO_IN);
+ } else {
+ qio_channel_wait(ioc, G_IO_IN);
+ }
+ continue;
+ } else if (len < 0) {
+ goto cleanup;
+ } else if (len == 0) {
+ if (partial) {
+ error_setg(errp,
+ "Unexpected end-of-file before all bytes were read");
+ } else {
+ ret = 0;
+ }
+ goto cleanup;
+ }
+
+ partial = true;
+ iov_discard_front(&local_iov, &nlocal_iov, len);
+ }
+
+ ret = 1;
+
+ cleanup:
+ g_free(local_iov_head);
+ return ret;
+}
+
+int qio_channel_readv_all(QIOChannel *ioc,
+ const struct iovec *iov,
+ size_t niov,
+ Error **errp)
+{
+ int ret = qio_channel_readv_all_eof(ioc, iov, niov, errp);
+
+ if (ret == 0) {
+ ret = -1;
+ error_setg(errp,
+ "Unexpected end-of-file before all bytes were read");
+ } else if (ret == 1) {
+ ret = 0;
+ }
+ return ret;
+}
+
+int qio_channel_writev_all(QIOChannel *ioc,
+ const struct iovec *iov,
+ size_t niov,
+ Error **errp)
+{
+ int ret = -1;
+ struct iovec *local_iov = g_new(struct iovec, niov);
+ struct iovec *local_iov_head = local_iov;
+ unsigned int nlocal_iov = niov;
+
+ nlocal_iov = iov_copy(local_iov, nlocal_iov,
+ iov, niov,
+ 0, iov_size(iov, niov));
+
+ while (nlocal_iov > 0) {
+ ssize_t len;
+ len = qio_channel_writev(ioc, local_iov, nlocal_iov, errp);
+ if (len == QIO_CHANNEL_ERR_BLOCK) {
+ if (qemu_in_coroutine()) {
+ qio_channel_yield(ioc, G_IO_OUT);
+ } else {
+ qio_channel_wait(ioc, G_IO_OUT);
+ }
+ continue;
+ }
+ if (len < 0) {
+ goto cleanup;
+ }
+
+ iov_discard_front(&local_iov, &nlocal_iov, len);
+ }
+
+ ret = 0;
+ cleanup:
+ g_free(local_iov_head);
+ return ret;
+}
+
ssize_t qio_channel_readv(QIOChannel *ioc,
const struct iovec *iov,
size_t niov,
}
+int qio_channel_read_all_eof(QIOChannel *ioc,
+ char *buf,
+ size_t buflen,
+ Error **errp)
+{
+ struct iovec iov = { .iov_base = buf, .iov_len = buflen };
+ return qio_channel_readv_all_eof(ioc, &iov, 1, errp);
+}
+
+
+int qio_channel_read_all(QIOChannel *ioc,
+ char *buf,
+ size_t buflen,
+ Error **errp)
+{
+ struct iovec iov = { .iov_base = buf, .iov_len = buflen };
+ return qio_channel_readv_all(ioc, &iov, 1, errp);
+}
+
+
+int qio_channel_write_all(QIOChannel *ioc,
+ const char *buf,
+ size_t buflen,
+ Error **errp)
+{
+ struct iovec iov = { .iov_base = (char *)buf, .iov_len = buflen };
+ return qio_channel_writev_all(ioc, &iov, 1, errp);
+}
+
+
int qio_channel_set_blocking(QIOChannel *ioc,
bool enabled,
Error **errp)
GIOCondition condition)
{
QIOChannelClass *klass = QIO_CHANNEL_GET_CLASS(ioc);
- return klass->io_create_watch(ioc, condition);
+ GSource *ret = klass->io_create_watch(ioc, condition);
+
+ if (ioc->name) {
+ g_source_set_name(ret, ioc->name);
+ }
+
+ return ret;
}
-guint qio_channel_add_watch(QIOChannel *ioc,
- GIOCondition condition,
- QIOChannelFunc func,
- gpointer user_data,
- GDestroyNotify notify)
+void qio_channel_set_aio_fd_handler(QIOChannel *ioc,
+ AioContext *ctx,
+ IOHandler *io_read,
+ IOHandler *io_write,
+ void *opaque)
+{
+ QIOChannelClass *klass = QIO_CHANNEL_GET_CLASS(ioc);
+
+ klass->io_set_aio_fd_handler(ioc, ctx, io_read, io_write, opaque);
+}
+
+guint qio_channel_add_watch_full(QIOChannel *ioc,
+ GIOCondition condition,
+ QIOChannelFunc func,
+ gpointer user_data,
+ GDestroyNotify notify,
+ GMainContext *context)
{
GSource *source;
guint id;
g_source_set_callback(source, (GSourceFunc)func, user_data, notify);
- id = g_source_attach(source, NULL);
+ id = g_source_attach(source, context);
g_source_unref(source);
return id;
}
+guint qio_channel_add_watch(QIOChannel *ioc,
+ GIOCondition condition,
+ QIOChannelFunc func,
+ gpointer user_data,
+ GDestroyNotify notify)
+{
+ return qio_channel_add_watch_full(ioc, condition, func,
+ user_data, notify, NULL);
+}
+
+GSource *qio_channel_add_watch_source(QIOChannel *ioc,
+ GIOCondition condition,
+ QIOChannelFunc func,
+ gpointer user_data,
+ GDestroyNotify notify,
+ GMainContext *context)
+{
+ GSource *source;
+ guint id;
+
+ id = qio_channel_add_watch_full(ioc, condition, func,
+ user_data, notify, context);
+ source = g_main_context_find_source_by_id(context, id);
+ g_source_ref(source);
+ return source;
+}
+
int qio_channel_shutdown(QIOChannel *ioc,
QIOChannelShutdown how,
}
-typedef struct QIOChannelYieldData QIOChannelYieldData;
-struct QIOChannelYieldData {
- QIOChannel *ioc;
- Coroutine *co;
-};
+static void qio_channel_restart_read(void *opaque)
+{
+ QIOChannel *ioc = opaque;
+ Coroutine *co = ioc->read_coroutine;
+ /* Assert that aio_co_wake() reenters the coroutine directly */
+ assert(qemu_get_current_aio_context() ==
+ qemu_coroutine_get_aio_context(co));
+ aio_co_wake(co);
+}
-static gboolean qio_channel_yield_enter(QIOChannel *ioc,
- GIOCondition condition,
- gpointer opaque)
+static void qio_channel_restart_write(void *opaque)
{
- QIOChannelYieldData *data = opaque;
- qemu_coroutine_enter(data->co, NULL);
- return FALSE;
+ QIOChannel *ioc = opaque;
+ Coroutine *co = ioc->write_coroutine;
+
+ /* Assert that aio_co_wake() reenters the coroutine directly */
+ assert(qemu_get_current_aio_context() ==
+ qemu_coroutine_get_aio_context(co));
+ aio_co_wake(co);
+}
+
+static void qio_channel_set_aio_fd_handlers(QIOChannel *ioc)
+{
+ IOHandler *rd_handler = NULL, *wr_handler = NULL;
+ AioContext *ctx;
+
+ if (ioc->read_coroutine) {
+ rd_handler = qio_channel_restart_read;
+ }
+ if (ioc->write_coroutine) {
+ wr_handler = qio_channel_restart_write;
+ }
+
+ ctx = ioc->ctx ? ioc->ctx : iohandler_get_aio_context();
+ qio_channel_set_aio_fd_handler(ioc, ctx, rd_handler, wr_handler, ioc);
}
+void qio_channel_attach_aio_context(QIOChannel *ioc,
+ AioContext *ctx)
+{
+ assert(!ioc->read_coroutine);
+ assert(!ioc->write_coroutine);
+ ioc->ctx = ctx;
+}
+
+void qio_channel_detach_aio_context(QIOChannel *ioc)
+{
+ ioc->read_coroutine = NULL;
+ ioc->write_coroutine = NULL;
+ qio_channel_set_aio_fd_handlers(ioc);
+ ioc->ctx = NULL;
+}
void coroutine_fn qio_channel_yield(QIOChannel *ioc,
GIOCondition condition)
{
- QIOChannelYieldData data;
-
assert(qemu_in_coroutine());
- data.ioc = ioc;
- data.co = qemu_coroutine_self();
- qio_channel_add_watch(ioc,
- condition,
- qio_channel_yield_enter,
- &data,
- NULL);
+ if (condition == G_IO_IN) {
+ assert(!ioc->read_coroutine);
+ ioc->read_coroutine = qemu_coroutine_self();
+ } else if (condition == G_IO_OUT) {
+ assert(!ioc->write_coroutine);
+ ioc->write_coroutine = qemu_coroutine_self();
+ } else {
+ abort();
+ }
+ qio_channel_set_aio_fd_handlers(ioc);
qemu_coroutine_yield();
+
+ /* Allow interrupting the operation by reentering the coroutine other than
+ * through the aio_fd_handlers. */
+ if (condition == G_IO_IN && ioc->read_coroutine) {
+ ioc->read_coroutine = NULL;
+ qio_channel_set_aio_fd_handlers(ioc);
+ } else if (condition == G_IO_OUT && ioc->write_coroutine) {
+ ioc->write_coroutine = NULL;
+ qio_channel_set_aio_fd_handlers(ioc);
+ }
}
}
-#ifdef _WIN32
static void qio_channel_finalize(Object *obj)
{
QIOChannel *ioc = QIO_CHANNEL(obj);
+ g_free(ioc->name);
+
+#ifdef _WIN32
if (ioc->event) {
CloseHandle(ioc->event);
}
-}
#endif
+}
static const TypeInfo qio_channel_info = {
.parent = TYPE_OBJECT,
.name = TYPE_QIO_CHANNEL,
.instance_size = sizeof(QIOChannel),
-#ifdef _WIN32
.instance_finalize = qio_channel_finalize,
-#endif
.abstract = true,
.class_size = sizeof(QIOChannelClass),
};
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