Merge tag 'for-7.1-hppa' of https://github.com/hdeller/qemu-hppa into staging
[qemu.git] / chardev / char-fd.c
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 "chardev/char-fe.h"
32 #include "io/channel-file.h"
33
34 #include "chardev/char-fd.h"
35 #include "chardev/char-io.h"
36
37 /* Called with chr_write_lock held. */
38 static int fd_chr_write(Chardev *chr, const uint8_t *buf, int len)
39 {
40 FDChardev *s = FD_CHARDEV(chr);
41
42 if (!s->ioc_out) {
43 return -1;
44 }
45
46 return io_channel_send(s->ioc_out, buf, len);
47 }
48
49 static gboolean fd_chr_read(QIOChannel *chan, GIOCondition cond, void *opaque)
50 {
51 Chardev *chr = CHARDEV(opaque);
52 FDChardev *s = FD_CHARDEV(opaque);
53 int len;
54 uint8_t buf[CHR_READ_BUF_LEN];
55 ssize_t ret;
56
57 len = sizeof(buf);
58 if (len > s->max_size) {
59 len = s->max_size;
60 }
61 if (len == 0) {
62 return TRUE;
63 }
64
65 ret = qio_channel_read(
66 chan, (gchar *)buf, len, NULL);
67 if (ret == 0) {
68 remove_fd_in_watch(chr);
69 qemu_chr_be_event(chr, CHR_EVENT_CLOSED);
70 return FALSE;
71 }
72 if (ret > 0) {
73 qemu_chr_be_write(chr, buf, ret);
74 }
75
76 return TRUE;
77 }
78
79 static int fd_chr_read_poll(void *opaque)
80 {
81 Chardev *chr = CHARDEV(opaque);
82 FDChardev *s = FD_CHARDEV(opaque);
83
84 s->max_size = qemu_chr_be_can_write(chr);
85 return s->max_size;
86 }
87
88 typedef struct FDSource {
89 GSource parent;
90
91 GIOCondition cond;
92 } FDSource;
93
94 static gboolean
95 fd_source_prepare(GSource *source,
96 gint *timeout_)
97 {
98 FDSource *src = (FDSource *)source;
99
100 return src->cond != 0;
101 }
102
103 static gboolean
104 fd_source_check(GSource *source)
105 {
106 FDSource *src = (FDSource *)source;
107
108 return src->cond != 0;
109 }
110
111 static gboolean
112 fd_source_dispatch(GSource *source, GSourceFunc callback,
113 gpointer user_data)
114 {
115 FDSource *src = (FDSource *)source;
116 FEWatchFunc func = (FEWatchFunc)callback;
117 gboolean ret = G_SOURCE_CONTINUE;
118
119 if (src->cond) {
120 ret = func(NULL, src->cond, user_data);
121 src->cond = 0;
122 }
123
124 return ret;
125 }
126
127 static GSourceFuncs fd_source_funcs = {
128 fd_source_prepare,
129 fd_source_check,
130 fd_source_dispatch,
131 NULL, NULL, NULL
132 };
133
134 static GSource *fd_source_new(FDChardev *chr)
135 {
136 return g_source_new(&fd_source_funcs, sizeof(FDSource));
137 }
138
139 static gboolean child_func(GIOChannel *source,
140 GIOCondition condition,
141 gpointer data)
142 {
143 FDSource *parent = data;
144
145 parent->cond |= condition;
146
147 return G_SOURCE_CONTINUE;
148 }
149
150 static GSource *fd_chr_add_watch(Chardev *chr, GIOCondition cond)
151 {
152 FDChardev *s = FD_CHARDEV(chr);
153 g_autoptr(GSource) source = fd_source_new(s);
154
155 if (s->ioc_out) {
156 g_autoptr(GSource) child = qio_channel_create_watch(s->ioc_out, cond & ~G_IO_IN);
157 g_source_set_callback(child, (GSourceFunc)child_func, source, NULL);
158 g_source_add_child_source(source, child);
159 }
160 if (s->ioc_in) {
161 g_autoptr(GSource) child = qio_channel_create_watch(s->ioc_in, cond & ~G_IO_OUT);
162 g_source_set_callback(child, (GSourceFunc)child_func, source, NULL);
163 g_source_add_child_source(source, child);
164 }
165
166 return g_steal_pointer(&source);
167 }
168
169 static void fd_chr_update_read_handler(Chardev *chr)
170 {
171 FDChardev *s = FD_CHARDEV(chr);
172
173 remove_fd_in_watch(chr);
174 if (s->ioc_in) {
175 chr->gsource = io_add_watch_poll(chr, s->ioc_in,
176 fd_chr_read_poll,
177 fd_chr_read, chr,
178 chr->gcontext);
179 }
180 }
181
182 static void char_fd_finalize(Object *obj)
183 {
184 Chardev *chr = CHARDEV(obj);
185 FDChardev *s = FD_CHARDEV(obj);
186
187 remove_fd_in_watch(chr);
188 if (s->ioc_in) {
189 object_unref(OBJECT(s->ioc_in));
190 }
191 if (s->ioc_out) {
192 object_unref(OBJECT(s->ioc_out));
193 }
194
195 qemu_chr_be_event(chr, CHR_EVENT_CLOSED);
196 }
197
198 int qmp_chardev_open_file_source(char *src, int flags, Error **errp)
199 {
200 int fd = -1;
201
202 TFR(fd = qemu_open_old(src, flags, 0666));
203 if (fd == -1) {
204 error_setg_file_open(errp, errno, src);
205 }
206 return fd;
207 }
208
209 /* open a character device to a unix fd */
210 void qemu_chr_open_fd(Chardev *chr,
211 int fd_in, int fd_out)
212 {
213 FDChardev *s = FD_CHARDEV(chr);
214 g_autofree char *name = NULL;
215
216 if (fd_out >= 0) {
217 qemu_set_nonblock(fd_out);
218 }
219
220 if (fd_out == fd_in && fd_in >= 0) {
221 s->ioc_in = QIO_CHANNEL(qio_channel_file_new_fd(fd_in));
222 name = g_strdup_printf("chardev-file-%s", chr->label);
223 qio_channel_set_name(QIO_CHANNEL(s->ioc_in), name);
224 s->ioc_out = QIO_CHANNEL(object_ref(s->ioc_in));
225 return;
226 }
227
228 if (fd_in >= 0) {
229 s->ioc_in = QIO_CHANNEL(qio_channel_file_new_fd(fd_in));
230 name = g_strdup_printf("chardev-file-in-%s", chr->label);
231 qio_channel_set_name(QIO_CHANNEL(s->ioc_in), name);
232 }
233
234 if (fd_out >= 0) {
235 s->ioc_out = QIO_CHANNEL(qio_channel_file_new_fd(fd_out));
236 g_free(name);
237 name = g_strdup_printf("chardev-file-out-%s", chr->label);
238 qio_channel_set_name(QIO_CHANNEL(s->ioc_out), name);
239 }
240 }
241
242 static void char_fd_class_init(ObjectClass *oc, void *data)
243 {
244 ChardevClass *cc = CHARDEV_CLASS(oc);
245
246 cc->chr_add_watch = fd_chr_add_watch;
247 cc->chr_write = fd_chr_write;
248 cc->chr_update_read_handler = fd_chr_update_read_handler;
249 }
250
251 static const TypeInfo char_fd_type_info = {
252 .name = TYPE_CHARDEV_FD,
253 .parent = TYPE_CHARDEV,
254 .instance_size = sizeof(FDChardev),
255 .instance_finalize = char_fd_finalize,
256 .class_init = char_fd_class_init,
257 .abstract = true,
258 };
259
260 static void register_types(void)
261 {
262 type_register_static(&char_fd_type_info);
263 }
264
265 type_init(register_types);