Marc-André Lureau | a6da7ff | 2016-12-12 17:07:52 +0300 | [diff] [blame] | 1 | /* |
| 2 | * QEMU System Emulator |
| 3 | * |
| 4 | * Copyright (c) 2003-2008 Fabrice Bellard |
| 5 | * |
| 6 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
| 7 | * of this software and associated documentation files (the "Software"), to deal |
| 8 | * in the Software without restriction, including without limitation the rights |
| 9 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| 10 | * copies of the Software, and to permit persons to whom the Software is |
| 11 | * furnished to do so, subject to the following conditions: |
| 12 | * |
| 13 | * The above copyright notice and this permission notice shall be included in |
| 14 | * all copies or substantial portions of the Software. |
| 15 | * |
| 16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| 19 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 20 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 21 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| 22 | * THE SOFTWARE. |
| 23 | */ |
| 24 | #include "qemu/osdep.h" |
Marc-André Lureau | 8228e35 | 2017-01-26 17:19:46 +0400 | [diff] [blame] | 25 | #include "chardev/char-io.h" |
Marc-André Lureau | a6da7ff | 2016-12-12 17:07:52 +0300 | [diff] [blame] | 26 | |
| 27 | typedef struct IOWatchPoll { |
| 28 | GSource parent; |
| 29 | |
| 30 | QIOChannel *ioc; |
| 31 | GSource *src; |
| 32 | |
| 33 | IOCanReadHandler *fd_can_read; |
| 34 | GSourceFunc fd_read; |
| 35 | void *opaque; |
Daniel P. Berrangé | 038b421 | 2024-03-18 17:08:30 +0000 | [diff] [blame] | 36 | GMainContext *context; |
Marc-André Lureau | a6da7ff | 2016-12-12 17:07:52 +0300 | [diff] [blame] | 37 | } IOWatchPoll; |
| 38 | |
| 39 | static IOWatchPoll *io_watch_poll_from_source(GSource *source) |
| 40 | { |
| 41 | return container_of(source, IOWatchPoll, parent); |
| 42 | } |
| 43 | |
| 44 | static gboolean io_watch_poll_prepare(GSource *source, |
| 45 | gint *timeout) |
| 46 | { |
| 47 | IOWatchPoll *iwp = io_watch_poll_from_source(source); |
| 48 | bool now_active = iwp->fd_can_read(iwp->opaque) > 0; |
| 49 | bool was_active = iwp->src != NULL; |
| 50 | if (was_active == now_active) { |
| 51 | return FALSE; |
| 52 | } |
| 53 | |
Daniel P. Berrangé | 038b421 | 2024-03-18 17:08:30 +0000 | [diff] [blame] | 54 | /* |
| 55 | * We do not register the QIOChannel watch as a child GSource. |
| 56 | * The 'prepare' function on the parent GSource will be |
| 57 | * skipped if a child GSource's 'prepare' function indicates |
| 58 | * readiness. We need this prepare function be guaranteed |
| 59 | * to run on *every* iteration of the main loop, because |
| 60 | * it is critical to ensure we remove the QIOChannel watch |
| 61 | * if 'fd_can_read' indicates the frontend cannot receive |
| 62 | * more data. |
| 63 | */ |
Marc-André Lureau | a6da7ff | 2016-12-12 17:07:52 +0300 | [diff] [blame] | 64 | if (now_active) { |
| 65 | iwp->src = qio_channel_create_watch( |
| 66 | iwp->ioc, G_IO_IN | G_IO_ERR | G_IO_HUP | G_IO_NVAL); |
| 67 | g_source_set_callback(iwp->src, iwp->fd_read, iwp->opaque, NULL); |
Daniel P. Berrangé | 038b421 | 2024-03-18 17:08:30 +0000 | [diff] [blame] | 68 | g_source_attach(iwp->src, iwp->context); |
Marc-André Lureau | a7077b8 | 2018-08-27 15:48:24 +0200 | [diff] [blame] | 69 | } else { |
Daniel P. Berrangé | 038b421 | 2024-03-18 17:08:30 +0000 | [diff] [blame] | 70 | g_source_destroy(iwp->src); |
| 71 | g_source_unref(iwp->src); |
Marc-André Lureau | a6da7ff | 2016-12-12 17:07:52 +0300 | [diff] [blame] | 72 | iwp->src = NULL; |
| 73 | } |
| 74 | return FALSE; |
| 75 | } |
| 76 | |
Daniel P. Berrangé | 038b421 | 2024-03-18 17:08:30 +0000 | [diff] [blame] | 77 | static gboolean io_watch_poll_check(GSource *source) |
| 78 | { |
| 79 | return FALSE; |
| 80 | } |
| 81 | |
Marc-André Lureau | a6da7ff | 2016-12-12 17:07:52 +0300 | [diff] [blame] | 82 | static gboolean io_watch_poll_dispatch(GSource *source, GSourceFunc callback, |
| 83 | gpointer user_data) |
| 84 | { |
Daniel P. Berrangé | 038b421 | 2024-03-18 17:08:30 +0000 | [diff] [blame] | 85 | abort(); |
| 86 | } |
| 87 | |
| 88 | static void io_watch_poll_finalize(GSource *source) |
| 89 | { |
Daniel P. Berrangé | 038b421 | 2024-03-18 17:08:30 +0000 | [diff] [blame] | 90 | IOWatchPoll *iwp = io_watch_poll_from_source(source); |
Sergey Dyasli | e0bf954 | 2024-07-12 09:26:59 +0000 | [diff] [blame] | 91 | if (iwp->src) { |
| 92 | g_source_destroy(iwp->src); |
| 93 | g_source_unref(iwp->src); |
| 94 | iwp->src = NULL; |
| 95 | } |
Marc-André Lureau | a6da7ff | 2016-12-12 17:07:52 +0300 | [diff] [blame] | 96 | } |
| 97 | |
| 98 | static GSourceFuncs io_watch_poll_funcs = { |
| 99 | .prepare = io_watch_poll_prepare, |
Daniel P. Berrangé | 038b421 | 2024-03-18 17:08:30 +0000 | [diff] [blame] | 100 | .check = io_watch_poll_check, |
Marc-André Lureau | a6da7ff | 2016-12-12 17:07:52 +0300 | [diff] [blame] | 101 | .dispatch = io_watch_poll_dispatch, |
Daniel P. Berrangé | 038b421 | 2024-03-18 17:08:30 +0000 | [diff] [blame] | 102 | .finalize = io_watch_poll_finalize, |
Marc-André Lureau | a6da7ff | 2016-12-12 17:07:52 +0300 | [diff] [blame] | 103 | }; |
| 104 | |
zhanghailiang | b19456d | 2017-04-19 09:15:32 +0800 | [diff] [blame] | 105 | GSource *io_add_watch_poll(Chardev *chr, |
Marc-André Lureau | a6da7ff | 2016-12-12 17:07:52 +0300 | [diff] [blame] | 106 | QIOChannel *ioc, |
| 107 | IOCanReadHandler *fd_can_read, |
| 108 | QIOChannelFunc fd_read, |
| 109 | gpointer user_data, |
| 110 | GMainContext *context) |
| 111 | { |
| 112 | IOWatchPoll *iwp; |
Marc-André Lureau | a6da7ff | 2016-12-12 17:07:52 +0300 | [diff] [blame] | 113 | char *name; |
| 114 | |
| 115 | iwp = (IOWatchPoll *) g_source_new(&io_watch_poll_funcs, |
| 116 | sizeof(IOWatchPoll)); |
| 117 | iwp->fd_can_read = fd_can_read; |
| 118 | iwp->opaque = user_data; |
| 119 | iwp->ioc = ioc; |
| 120 | iwp->fd_read = (GSourceFunc) fd_read; |
| 121 | iwp->src = NULL; |
Daniel P. Berrangé | 038b421 | 2024-03-18 17:08:30 +0000 | [diff] [blame] | 122 | iwp->context = context; |
Marc-André Lureau | a6da7ff | 2016-12-12 17:07:52 +0300 | [diff] [blame] | 123 | |
| 124 | name = g_strdup_printf("chardev-iowatch-%s", chr->label); |
| 125 | g_source_set_name((GSource *)iwp, name); |
| 126 | g_free(name); |
| 127 | |
zhanghailiang | b19456d | 2017-04-19 09:15:32 +0800 | [diff] [blame] | 128 | g_source_attach(&iwp->parent, context); |
Marc-André Lureau | a6da7ff | 2016-12-12 17:07:52 +0300 | [diff] [blame] | 129 | g_source_unref(&iwp->parent); |
zhanghailiang | b19456d | 2017-04-19 09:15:32 +0800 | [diff] [blame] | 130 | return (GSource *)iwp; |
Marc-André Lureau | a6da7ff | 2016-12-12 17:07:52 +0300 | [diff] [blame] | 131 | } |
| 132 | |
Daniel P. Berrangé | 038b421 | 2024-03-18 17:08:30 +0000 | [diff] [blame] | 133 | static void io_remove_watch_poll(GSource *source) |
| 134 | { |
| 135 | IOWatchPoll *iwp; |
| 136 | |
| 137 | iwp = io_watch_poll_from_source(source); |
Daniel P. Berrangé | 038b421 | 2024-03-18 17:08:30 +0000 | [diff] [blame] | 138 | g_source_destroy(&iwp->parent); |
| 139 | } |
| 140 | |
zhanghailiang | b19456d | 2017-04-19 09:15:32 +0800 | [diff] [blame] | 141 | void remove_fd_in_watch(Chardev *chr) |
Marc-André Lureau | a6da7ff | 2016-12-12 17:07:52 +0300 | [diff] [blame] | 142 | { |
zhanghailiang | b19456d | 2017-04-19 09:15:32 +0800 | [diff] [blame] | 143 | if (chr->gsource) { |
Daniel P. Berrangé | 038b421 | 2024-03-18 17:08:30 +0000 | [diff] [blame] | 144 | io_remove_watch_poll(chr->gsource); |
zhanghailiang | b19456d | 2017-04-19 09:15:32 +0800 | [diff] [blame] | 145 | chr->gsource = NULL; |
Marc-André Lureau | a6da7ff | 2016-12-12 17:07:52 +0300 | [diff] [blame] | 146 | } |
| 147 | } |
| 148 | |
| 149 | int io_channel_send_full(QIOChannel *ioc, |
| 150 | const void *buf, size_t len, |
| 151 | int *fds, size_t nfds) |
| 152 | { |
| 153 | size_t offset = 0; |
| 154 | |
| 155 | while (offset < len) { |
| 156 | ssize_t ret = 0; |
| 157 | struct iovec iov = { .iov_base = (char *)buf + offset, |
| 158 | .iov_len = len - offset }; |
| 159 | |
| 160 | ret = qio_channel_writev_full( |
| 161 | ioc, &iov, 1, |
Leonardo Bras | b88651c | 2022-05-13 03:28:31 -0300 | [diff] [blame] | 162 | fds, nfds, 0, NULL); |
Marc-André Lureau | a6da7ff | 2016-12-12 17:07:52 +0300 | [diff] [blame] | 163 | if (ret == QIO_CHANNEL_ERR_BLOCK) { |
| 164 | if (offset) { |
| 165 | return offset; |
| 166 | } |
| 167 | |
| 168 | errno = EAGAIN; |
| 169 | return -1; |
| 170 | } else if (ret < 0) { |
| 171 | errno = EINVAL; |
| 172 | return -1; |
| 173 | } |
| 174 | |
| 175 | offset += ret; |
| 176 | } |
| 177 | |
| 178 | return offset; |
| 179 | } |
| 180 | |
| 181 | int io_channel_send(QIOChannel *ioc, const void *buf, size_t len) |
| 182 | { |
| 183 | return io_channel_send_full(ioc, buf, len, NULL, 0); |
| 184 | } |