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; |
Marc-André Lureau | a6da7ff | 2016-12-12 17:07:52 +0300 | [diff] [blame] | 36 | } IOWatchPoll; |
| 37 | |
| 38 | static IOWatchPoll *io_watch_poll_from_source(GSource *source) |
| 39 | { |
| 40 | return container_of(source, IOWatchPoll, parent); |
| 41 | } |
| 42 | |
| 43 | static gboolean io_watch_poll_prepare(GSource *source, |
| 44 | gint *timeout) |
| 45 | { |
| 46 | IOWatchPoll *iwp = io_watch_poll_from_source(source); |
| 47 | bool now_active = iwp->fd_can_read(iwp->opaque) > 0; |
| 48 | bool was_active = iwp->src != NULL; |
| 49 | if (was_active == now_active) { |
| 50 | return FALSE; |
| 51 | } |
| 52 | |
| 53 | if (now_active) { |
| 54 | iwp->src = qio_channel_create_watch( |
| 55 | iwp->ioc, G_IO_IN | G_IO_ERR | G_IO_HUP | G_IO_NVAL); |
| 56 | g_source_set_callback(iwp->src, iwp->fd_read, iwp->opaque, NULL); |
Marc-André Lureau | a7077b8 | 2018-08-27 15:48:24 +0200 | [diff] [blame] | 57 | g_source_add_child_source(source, iwp->src); |
Marc-André Lureau | a6da7ff | 2016-12-12 17:07:52 +0300 | [diff] [blame] | 58 | g_source_unref(iwp->src); |
Marc-André Lureau | a7077b8 | 2018-08-27 15:48:24 +0200 | [diff] [blame] | 59 | } else { |
| 60 | g_source_remove_child_source(source, iwp->src); |
Marc-André Lureau | a6da7ff | 2016-12-12 17:07:52 +0300 | [diff] [blame] | 61 | iwp->src = NULL; |
| 62 | } |
| 63 | return FALSE; |
| 64 | } |
| 65 | |
Marc-André Lureau | a6da7ff | 2016-12-12 17:07:52 +0300 | [diff] [blame] | 66 | static gboolean io_watch_poll_dispatch(GSource *source, GSourceFunc callback, |
| 67 | gpointer user_data) |
| 68 | { |
Marc-André Lureau | a7077b8 | 2018-08-27 15:48:24 +0200 | [diff] [blame] | 69 | return G_SOURCE_CONTINUE; |
Marc-André Lureau | a6da7ff | 2016-12-12 17:07:52 +0300 | [diff] [blame] | 70 | } |
| 71 | |
| 72 | static GSourceFuncs io_watch_poll_funcs = { |
| 73 | .prepare = io_watch_poll_prepare, |
Marc-André Lureau | a6da7ff | 2016-12-12 17:07:52 +0300 | [diff] [blame] | 74 | .dispatch = io_watch_poll_dispatch, |
Marc-André Lureau | a6da7ff | 2016-12-12 17:07:52 +0300 | [diff] [blame] | 75 | }; |
| 76 | |
zhanghailiang | b19456d | 2017-04-19 09:15:32 +0800 | [diff] [blame] | 77 | GSource *io_add_watch_poll(Chardev *chr, |
Marc-André Lureau | a6da7ff | 2016-12-12 17:07:52 +0300 | [diff] [blame] | 78 | QIOChannel *ioc, |
| 79 | IOCanReadHandler *fd_can_read, |
| 80 | QIOChannelFunc fd_read, |
| 81 | gpointer user_data, |
| 82 | GMainContext *context) |
| 83 | { |
| 84 | IOWatchPoll *iwp; |
Marc-André Lureau | a6da7ff | 2016-12-12 17:07:52 +0300 | [diff] [blame] | 85 | char *name; |
| 86 | |
| 87 | iwp = (IOWatchPoll *) g_source_new(&io_watch_poll_funcs, |
| 88 | sizeof(IOWatchPoll)); |
| 89 | iwp->fd_can_read = fd_can_read; |
| 90 | iwp->opaque = user_data; |
| 91 | iwp->ioc = ioc; |
| 92 | iwp->fd_read = (GSourceFunc) fd_read; |
| 93 | iwp->src = NULL; |
Marc-André Lureau | a6da7ff | 2016-12-12 17:07:52 +0300 | [diff] [blame] | 94 | |
| 95 | name = g_strdup_printf("chardev-iowatch-%s", chr->label); |
| 96 | g_source_set_name((GSource *)iwp, name); |
| 97 | g_free(name); |
| 98 | |
zhanghailiang | b19456d | 2017-04-19 09:15:32 +0800 | [diff] [blame] | 99 | g_source_attach(&iwp->parent, context); |
Marc-André Lureau | a6da7ff | 2016-12-12 17:07:52 +0300 | [diff] [blame] | 100 | g_source_unref(&iwp->parent); |
zhanghailiang | b19456d | 2017-04-19 09:15:32 +0800 | [diff] [blame] | 101 | return (GSource *)iwp; |
Marc-André Lureau | a6da7ff | 2016-12-12 17:07:52 +0300 | [diff] [blame] | 102 | } |
| 103 | |
zhanghailiang | b19456d | 2017-04-19 09:15:32 +0800 | [diff] [blame] | 104 | void remove_fd_in_watch(Chardev *chr) |
Marc-André Lureau | a6da7ff | 2016-12-12 17:07:52 +0300 | [diff] [blame] | 105 | { |
zhanghailiang | b19456d | 2017-04-19 09:15:32 +0800 | [diff] [blame] | 106 | if (chr->gsource) { |
Marc-André Lureau | a7077b8 | 2018-08-27 15:48:24 +0200 | [diff] [blame] | 107 | g_source_destroy(chr->gsource); |
zhanghailiang | b19456d | 2017-04-19 09:15:32 +0800 | [diff] [blame] | 108 | chr->gsource = NULL; |
Marc-André Lureau | a6da7ff | 2016-12-12 17:07:52 +0300 | [diff] [blame] | 109 | } |
| 110 | } |
| 111 | |
| 112 | int io_channel_send_full(QIOChannel *ioc, |
| 113 | const void *buf, size_t len, |
| 114 | int *fds, size_t nfds) |
| 115 | { |
| 116 | size_t offset = 0; |
| 117 | |
| 118 | while (offset < len) { |
| 119 | ssize_t ret = 0; |
| 120 | struct iovec iov = { .iov_base = (char *)buf + offset, |
| 121 | .iov_len = len - offset }; |
| 122 | |
| 123 | ret = qio_channel_writev_full( |
| 124 | ioc, &iov, 1, |
| 125 | fds, nfds, NULL); |
| 126 | if (ret == QIO_CHANNEL_ERR_BLOCK) { |
| 127 | if (offset) { |
| 128 | return offset; |
| 129 | } |
| 130 | |
| 131 | errno = EAGAIN; |
| 132 | return -1; |
| 133 | } else if (ret < 0) { |
| 134 | errno = EINVAL; |
| 135 | return -1; |
| 136 | } |
| 137 | |
| 138 | offset += ret; |
| 139 | } |
| 140 | |
| 141 | return offset; |
| 142 | } |
| 143 | |
| 144 | int io_channel_send(QIOChannel *ioc, const void *buf, size_t len) |
| 145 | { |
| 146 | return io_channel_send_full(ioc, buf, len, NULL, 0); |
| 147 | } |