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" |
25 | #include "chardev/char-io.h" |
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; |
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); |
57 | g_source_add_child_source(source, iwp->src); |
58 | g_source_unref(iwp->src); |
59 | } else { |
60 | g_source_remove_child_source(source, iwp->src); |
61 | iwp->src = NULL; |
62 | } |
63 | return FALSE; |
64 | } |
65 | |
66 | static gboolean io_watch_poll_dispatch(GSource *source, GSourceFunc callback, |
67 | gpointer user_data) |
68 | { |
69 | return G_SOURCE_CONTINUE; |
70 | } |
71 | |
72 | static GSourceFuncs io_watch_poll_funcs = { |
73 | .prepare = io_watch_poll_prepare, |
74 | .dispatch = io_watch_poll_dispatch, |
75 | }; |
76 | |
77 | GSource *io_add_watch_poll(Chardev *chr, |
78 | QIOChannel *ioc, |
79 | IOCanReadHandler *fd_can_read, |
80 | QIOChannelFunc fd_read, |
81 | gpointer user_data, |
82 | GMainContext *context) |
83 | { |
84 | IOWatchPoll *iwp; |
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; |
94 | |
95 | name = g_strdup_printf("chardev-iowatch-%s" , chr->label); |
96 | g_source_set_name((GSource *)iwp, name); |
97 | g_free(name); |
98 | |
99 | g_source_attach(&iwp->parent, context); |
100 | g_source_unref(&iwp->parent); |
101 | return (GSource *)iwp; |
102 | } |
103 | |
104 | void remove_fd_in_watch(Chardev *chr) |
105 | { |
106 | if (chr->gsource) { |
107 | g_source_destroy(chr->gsource); |
108 | chr->gsource = NULL; |
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 | } |
148 | |