148 lines
4.3 KiB
C
148 lines
4.3 KiB
C
/*
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* QEMU System Emulator
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*
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* Copyright (c) 2003-2008 Fabrice Bellard
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "qemu/osdep.h"
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#include "chardev/char-io.h"
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typedef struct IOWatchPoll {
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GSource parent;
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QIOChannel *ioc;
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GSource *src;
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IOCanReadHandler *fd_can_read;
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GSourceFunc fd_read;
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void *opaque;
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} IOWatchPoll;
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static IOWatchPoll *io_watch_poll_from_source(GSource *source)
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{
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return container_of(source, IOWatchPoll, parent);
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}
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static gboolean io_watch_poll_prepare(GSource *source,
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gint *timeout)
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{
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IOWatchPoll *iwp = io_watch_poll_from_source(source);
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bool now_active = iwp->fd_can_read(iwp->opaque) > 0;
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bool was_active = iwp->src != NULL;
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if (was_active == now_active) {
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return FALSE;
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}
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if (now_active) {
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iwp->src = qio_channel_create_watch(
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iwp->ioc, G_IO_IN | G_IO_ERR | G_IO_HUP | G_IO_NVAL);
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g_source_set_callback(iwp->src, iwp->fd_read, iwp->opaque, NULL);
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g_source_add_child_source(source, iwp->src);
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g_source_unref(iwp->src);
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} else {
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g_source_remove_child_source(source, iwp->src);
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iwp->src = NULL;
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}
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return FALSE;
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}
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static gboolean io_watch_poll_dispatch(GSource *source, GSourceFunc callback,
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gpointer user_data)
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{
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return G_SOURCE_CONTINUE;
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}
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static GSourceFuncs io_watch_poll_funcs = {
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.prepare = io_watch_poll_prepare,
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.dispatch = io_watch_poll_dispatch,
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};
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GSource *io_add_watch_poll(Chardev *chr,
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QIOChannel *ioc,
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IOCanReadHandler *fd_can_read,
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QIOChannelFunc fd_read,
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gpointer user_data,
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GMainContext *context)
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{
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IOWatchPoll *iwp;
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char *name;
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iwp = (IOWatchPoll *) g_source_new(&io_watch_poll_funcs,
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sizeof(IOWatchPoll));
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iwp->fd_can_read = fd_can_read;
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iwp->opaque = user_data;
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iwp->ioc = ioc;
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iwp->fd_read = (GSourceFunc) fd_read;
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iwp->src = NULL;
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name = g_strdup_printf("chardev-iowatch-%s", chr->label);
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g_source_set_name((GSource *)iwp, name);
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g_free(name);
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g_source_attach(&iwp->parent, context);
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g_source_unref(&iwp->parent);
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return (GSource *)iwp;
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}
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void remove_fd_in_watch(Chardev *chr)
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{
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if (chr->gsource) {
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g_source_destroy(chr->gsource);
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chr->gsource = NULL;
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}
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}
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int io_channel_send_full(QIOChannel *ioc,
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const void *buf, size_t len,
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int *fds, size_t nfds)
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{
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size_t offset = 0;
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while (offset < len) {
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ssize_t ret = 0;
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struct iovec iov = { .iov_base = (char *)buf + offset,
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.iov_len = len - offset };
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ret = qio_channel_writev_full(
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ioc, &iov, 1,
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fds, nfds, 0, NULL);
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if (ret == QIO_CHANNEL_ERR_BLOCK) {
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if (offset) {
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return offset;
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}
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errno = EAGAIN;
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return -1;
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} else if (ret < 0) {
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errno = EINVAL;
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return -1;
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}
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offset += ret;
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}
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return offset;
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}
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int io_channel_send(QIOChannel *ioc, const void *buf, size_t len)
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{
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return io_channel_send_full(ioc, buf, len, NULL, 0);
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}
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