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 | |
25 | #include "qemu/osdep.h" |
26 | #include "qemu-common.h" |
27 | #include "qemu/module.h" |
28 | #include "qemu/sockets.h" |
29 | #include "qapi/error.h" |
30 | #include "chardev/char.h" |
31 | #include "io/channel-file.h" |
32 | |
33 | #include "chardev/char-fd.h" |
34 | #include "chardev/char-io.h" |
35 | |
36 | /* Called with chr_write_lock held. */ |
37 | static int fd_chr_write(Chardev *chr, const uint8_t *buf, int len) |
38 | { |
39 | FDChardev *s = FD_CHARDEV(chr); |
40 | |
41 | return io_channel_send(s->ioc_out, buf, len); |
42 | } |
43 | |
44 | static gboolean fd_chr_read(QIOChannel *chan, GIOCondition cond, void *opaque) |
45 | { |
46 | Chardev *chr = CHARDEV(opaque); |
47 | FDChardev *s = FD_CHARDEV(opaque); |
48 | int len; |
49 | uint8_t buf[CHR_READ_BUF_LEN]; |
50 | ssize_t ret; |
51 | |
52 | len = sizeof(buf); |
53 | if (len > s->max_size) { |
54 | len = s->max_size; |
55 | } |
56 | if (len == 0) { |
57 | return TRUE; |
58 | } |
59 | |
60 | ret = qio_channel_read( |
61 | chan, (gchar *)buf, len, NULL); |
62 | if (ret == 0) { |
63 | remove_fd_in_watch(chr); |
64 | qemu_chr_be_event(chr, CHR_EVENT_CLOSED); |
65 | return FALSE; |
66 | } |
67 | if (ret > 0) { |
68 | qemu_chr_be_write(chr, buf, ret); |
69 | } |
70 | |
71 | return TRUE; |
72 | } |
73 | |
74 | static int fd_chr_read_poll(void *opaque) |
75 | { |
76 | Chardev *chr = CHARDEV(opaque); |
77 | FDChardev *s = FD_CHARDEV(opaque); |
78 | |
79 | s->max_size = qemu_chr_be_can_write(chr); |
80 | return s->max_size; |
81 | } |
82 | |
83 | static GSource *fd_chr_add_watch(Chardev *chr, GIOCondition cond) |
84 | { |
85 | FDChardev *s = FD_CHARDEV(chr); |
86 | return qio_channel_create_watch(s->ioc_out, cond); |
87 | } |
88 | |
89 | static void fd_chr_update_read_handler(Chardev *chr) |
90 | { |
91 | FDChardev *s = FD_CHARDEV(chr); |
92 | |
93 | remove_fd_in_watch(chr); |
94 | if (s->ioc_in) { |
95 | chr->gsource = io_add_watch_poll(chr, s->ioc_in, |
96 | fd_chr_read_poll, |
97 | fd_chr_read, chr, |
98 | chr->gcontext); |
99 | } |
100 | } |
101 | |
102 | static void char_fd_finalize(Object *obj) |
103 | { |
104 | Chardev *chr = CHARDEV(obj); |
105 | FDChardev *s = FD_CHARDEV(obj); |
106 | |
107 | remove_fd_in_watch(chr); |
108 | if (s->ioc_in) { |
109 | object_unref(OBJECT(s->ioc_in)); |
110 | } |
111 | if (s->ioc_out) { |
112 | object_unref(OBJECT(s->ioc_out)); |
113 | } |
114 | |
115 | qemu_chr_be_event(chr, CHR_EVENT_CLOSED); |
116 | } |
117 | |
118 | int qmp_chardev_open_file_source(char *src, int flags, Error **errp) |
119 | { |
120 | int fd = -1; |
121 | |
122 | TFR(fd = qemu_open(src, flags, 0666)); |
123 | if (fd == -1) { |
124 | error_setg_file_open(errp, errno, src); |
125 | } |
126 | return fd; |
127 | } |
128 | |
129 | /* open a character device to a unix fd */ |
130 | void qemu_chr_open_fd(Chardev *chr, |
131 | int fd_in, int fd_out) |
132 | { |
133 | FDChardev *s = FD_CHARDEV(chr); |
134 | char *name; |
135 | |
136 | s->ioc_in = QIO_CHANNEL(qio_channel_file_new_fd(fd_in)); |
137 | name = g_strdup_printf("chardev-file-in-%s" , chr->label); |
138 | qio_channel_set_name(QIO_CHANNEL(s->ioc_in), name); |
139 | g_free(name); |
140 | s->ioc_out = QIO_CHANNEL(qio_channel_file_new_fd(fd_out)); |
141 | name = g_strdup_printf("chardev-file-out-%s" , chr->label); |
142 | qio_channel_set_name(QIO_CHANNEL(s->ioc_out), name); |
143 | g_free(name); |
144 | qemu_set_nonblock(fd_out); |
145 | } |
146 | |
147 | static void char_fd_class_init(ObjectClass *oc, void *data) |
148 | { |
149 | ChardevClass *cc = CHARDEV_CLASS(oc); |
150 | |
151 | cc->chr_add_watch = fd_chr_add_watch; |
152 | cc->chr_write = fd_chr_write; |
153 | cc->chr_update_read_handler = fd_chr_update_read_handler; |
154 | } |
155 | |
156 | static const TypeInfo char_fd_type_info = { |
157 | .name = TYPE_CHARDEV_FD, |
158 | .parent = TYPE_CHARDEV, |
159 | .instance_size = sizeof(FDChardev), |
160 | .instance_finalize = char_fd_finalize, |
161 | .class_init = char_fd_class_init, |
162 | .abstract = true, |
163 | }; |
164 | |
165 | static void register_types(void) |
166 | { |
167 | type_register_static(&char_fd_type_info); |
168 | } |
169 | |
170 | type_init(register_types); |
171 | |