It's a replacement of g_timeout_add[_seconds]() for chardevs. Chardevs now can have dedicated gcontext, we should always bind chardev tasks onto those gcontext rather than the default main context. Since there are quite a few of g_timeout_add[_seconds]() callers, a new function qemu_chr_timeout_add_ms() is introduced. One thing to mention is that, terminal3270 is still always running on main gcontext. However let's convert that as well since it's still part of chardev codes and in case one day we'll miss that when we move it out of main gcontext too. Also, convert all the timers from GSource tags into GSource pointers. Gsource tag IDs and g_source_remove()s can only work with default gcontext, while now these GSources can logically be attached to other contexts. So let's use explicit g_source_destroy() plus another g_source_unref() to remove a timer. Note: when in the timer handler, we don't need the g_source_destroy() any more since that'll be done automatically if the timer handler returns false (and that's what all the current handlers do). Yet another note: in pty_chr_rearm_timer() we take special care for ms=1000. This patch merged the two cases into one. Signed-off-by: Peter Xu <peterx@redhat.com> Message-Id: <20180104141835.17987-4-peterx@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
300 lines
8.4 KiB
C
300 lines
8.4 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 "qapi/error.h"
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#include "qemu-common.h"
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#include "chardev/char.h"
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#include "io/channel-file.h"
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#include "qemu/sockets.h"
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#include "qemu/error-report.h"
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#include "chardev/char-io.h"
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#if defined(__linux__) || defined(__sun__) || defined(__FreeBSD__) \
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|| defined(__NetBSD__) || defined(__OpenBSD__) || defined(__DragonFly__) \
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|| defined(__GLIBC__)
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typedef struct {
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Chardev parent;
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QIOChannel *ioc;
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int read_bytes;
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/* Protected by the Chardev chr_write_lock. */
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int connected;
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GSource *timer_src;
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GSource *open_source;
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} PtyChardev;
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#define PTY_CHARDEV(obj) OBJECT_CHECK(PtyChardev, (obj), TYPE_CHARDEV_PTY)
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static void pty_chr_update_read_handler_locked(Chardev *chr);
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static void pty_chr_state(Chardev *chr, int connected);
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static gboolean pty_chr_timer(gpointer opaque)
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{
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struct Chardev *chr = CHARDEV(opaque);
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PtyChardev *s = PTY_CHARDEV(opaque);
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qemu_mutex_lock(&chr->chr_write_lock);
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s->timer_src = NULL;
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g_source_unref(s->open_source);
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s->open_source = NULL;
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if (!s->connected) {
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/* Next poll ... */
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pty_chr_update_read_handler_locked(chr);
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}
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qemu_mutex_unlock(&chr->chr_write_lock);
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return FALSE;
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}
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static void pty_chr_timer_cancel(PtyChardev *s)
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{
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if (s->timer_src) {
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g_source_destroy(s->timer_src);
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g_source_unref(s->timer_src);
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s->timer_src = NULL;
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}
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}
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/* Called with chr_write_lock held. */
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static void pty_chr_rearm_timer(Chardev *chr, int ms)
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{
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PtyChardev *s = PTY_CHARDEV(chr);
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char *name;
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pty_chr_timer_cancel(s);
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name = g_strdup_printf("pty-timer-%s", chr->label);
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s->timer_src = qemu_chr_timeout_add_ms(chr, ms, pty_chr_timer, chr);
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g_source_set_name(s->timer_src, name);
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g_free(name);
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}
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/* Called with chr_write_lock held. */
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static void pty_chr_update_read_handler_locked(Chardev *chr)
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{
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PtyChardev *s = PTY_CHARDEV(chr);
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GPollFD pfd;
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int rc;
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QIOChannelFile *fioc = QIO_CHANNEL_FILE(s->ioc);
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pfd.fd = fioc->fd;
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pfd.events = G_IO_OUT;
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pfd.revents = 0;
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do {
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rc = g_poll(&pfd, 1, 0);
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} while (rc == -1 && errno == EINTR);
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assert(rc >= 0);
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if (pfd.revents & G_IO_HUP) {
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pty_chr_state(chr, 0);
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} else {
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pty_chr_state(chr, 1);
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}
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}
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static void pty_chr_update_read_handler(Chardev *chr)
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{
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qemu_mutex_lock(&chr->chr_write_lock);
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pty_chr_update_read_handler_locked(chr);
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qemu_mutex_unlock(&chr->chr_write_lock);
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}
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/* Called with chr_write_lock held. */
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static int char_pty_chr_write(Chardev *chr, const uint8_t *buf, int len)
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{
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PtyChardev *s = PTY_CHARDEV(chr);
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if (!s->connected) {
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/* guest sends data, check for (re-)connect */
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pty_chr_update_read_handler_locked(chr);
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if (!s->connected) {
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return len;
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}
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}
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return io_channel_send(s->ioc, buf, len);
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}
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static GSource *pty_chr_add_watch(Chardev *chr, GIOCondition cond)
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{
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PtyChardev *s = PTY_CHARDEV(chr);
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if (!s->connected) {
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return NULL;
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}
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return qio_channel_create_watch(s->ioc, cond);
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}
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static int pty_chr_read_poll(void *opaque)
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{
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Chardev *chr = CHARDEV(opaque);
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PtyChardev *s = PTY_CHARDEV(opaque);
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s->read_bytes = qemu_chr_be_can_write(chr);
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return s->read_bytes;
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}
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static gboolean pty_chr_read(QIOChannel *chan, GIOCondition cond, void *opaque)
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{
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Chardev *chr = CHARDEV(opaque);
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PtyChardev *s = PTY_CHARDEV(opaque);
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gsize len;
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uint8_t buf[CHR_READ_BUF_LEN];
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ssize_t ret;
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len = sizeof(buf);
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if (len > s->read_bytes) {
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len = s->read_bytes;
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}
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if (len == 0) {
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return TRUE;
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}
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ret = qio_channel_read(s->ioc, (char *)buf, len, NULL);
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if (ret <= 0) {
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pty_chr_state(chr, 0);
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return FALSE;
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} else {
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pty_chr_state(chr, 1);
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qemu_chr_be_write(chr, buf, ret);
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}
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return TRUE;
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}
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static gboolean qemu_chr_be_generic_open_func(gpointer opaque)
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{
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Chardev *chr = CHARDEV(opaque);
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PtyChardev *s = PTY_CHARDEV(opaque);
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s->open_source = NULL;
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qemu_chr_be_event(chr, CHR_EVENT_OPENED);
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return FALSE;
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}
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/* Called with chr_write_lock held. */
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static void pty_chr_state(Chardev *chr, int connected)
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{
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PtyChardev *s = PTY_CHARDEV(chr);
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if (!connected) {
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if (s->open_source) {
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g_source_destroy(s->open_source);
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g_source_unref(s->open_source);
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s->open_source = NULL;
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}
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remove_fd_in_watch(chr);
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s->connected = 0;
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/* (re-)connect poll interval for idle guests: once per second.
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* We check more frequently in case the guests sends data to
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* the virtual device linked to our pty. */
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pty_chr_rearm_timer(chr, 1000);
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} else {
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pty_chr_timer_cancel(s);
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if (!s->connected) {
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g_assert(s->open_source == NULL);
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s->open_source = g_idle_source_new();
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s->connected = 1;
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g_source_set_callback(s->open_source,
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qemu_chr_be_generic_open_func,
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chr, NULL);
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g_source_attach(s->open_source, chr->gcontext);
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}
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if (!chr->gsource) {
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chr->gsource = io_add_watch_poll(chr, s->ioc,
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pty_chr_read_poll,
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pty_chr_read,
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chr, chr->gcontext);
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}
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}
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}
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static void char_pty_finalize(Object *obj)
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{
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Chardev *chr = CHARDEV(obj);
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PtyChardev *s = PTY_CHARDEV(obj);
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qemu_mutex_lock(&chr->chr_write_lock);
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pty_chr_state(chr, 0);
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object_unref(OBJECT(s->ioc));
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pty_chr_timer_cancel(s);
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qemu_mutex_unlock(&chr->chr_write_lock);
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qemu_chr_be_event(chr, CHR_EVENT_CLOSED);
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}
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static void char_pty_open(Chardev *chr,
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ChardevBackend *backend,
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bool *be_opened,
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Error **errp)
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{
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PtyChardev *s;
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int master_fd, slave_fd;
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char pty_name[PATH_MAX];
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char *name;
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master_fd = qemu_openpty_raw(&slave_fd, pty_name);
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if (master_fd < 0) {
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error_setg_errno(errp, errno, "Failed to create PTY");
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return;
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}
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close(slave_fd);
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qemu_set_nonblock(master_fd);
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chr->filename = g_strdup_printf("pty:%s", pty_name);
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error_report("char device redirected to %s (label %s)",
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pty_name, chr->label);
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s = PTY_CHARDEV(chr);
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s->ioc = QIO_CHANNEL(qio_channel_file_new_fd(master_fd));
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name = g_strdup_printf("chardev-pty-%s", chr->label);
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qio_channel_set_name(QIO_CHANNEL(s->ioc), name);
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g_free(name);
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s->timer_src = NULL;
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*be_opened = false;
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}
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static void char_pty_class_init(ObjectClass *oc, void *data)
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{
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ChardevClass *cc = CHARDEV_CLASS(oc);
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cc->open = char_pty_open;
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cc->chr_write = char_pty_chr_write;
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cc->chr_update_read_handler = pty_chr_update_read_handler;
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cc->chr_add_watch = pty_chr_add_watch;
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}
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static const TypeInfo char_pty_type_info = {
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.name = TYPE_CHARDEV_PTY,
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.parent = TYPE_CHARDEV,
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.instance_size = sizeof(PtyChardev),
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.instance_finalize = char_pty_finalize,
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.class_init = char_pty_class_init,
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};
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static void register_types(void)
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{
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type_register_static(&char_pty_type_info);
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}
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type_init(register_types);
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#endif
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