hw/arm/exynos4210: Coalesce board_irqs and irq_table
[qemu/rayw.git] / chardev / char-fd.c
blob6ec9682b22f27f78f9fe9ed3bcb9f0ed190217bf
1 /*
2 * QEMU System Emulator
4 * Copyright (c) 2003-2008 Fabrice Bellard
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:
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
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.
25 #include "qemu/osdep.h"
26 #include "qemu/module.h"
27 #include "qemu/sockets.h"
28 #include "qapi/error.h"
29 #include "chardev/char.h"
30 #include "chardev/char-fe.h"
31 #include "io/channel-file.h"
33 #include "chardev/char-fd.h"
34 #include "chardev/char-io.h"
36 /* Called with chr_write_lock held. */
37 static int fd_chr_write(Chardev *chr, const uint8_t *buf, int len)
39 FDChardev *s = FD_CHARDEV(chr);
41 if (!s->ioc_out) {
42 return -1;
45 return io_channel_send(s->ioc_out, buf, len);
48 static gboolean fd_chr_read(QIOChannel *chan, GIOCondition cond, void *opaque)
50 Chardev *chr = CHARDEV(opaque);
51 FDChardev *s = FD_CHARDEV(opaque);
52 int len;
53 uint8_t buf[CHR_READ_BUF_LEN];
54 ssize_t ret;
56 len = sizeof(buf);
57 if (len > s->max_size) {
58 len = s->max_size;
60 if (len == 0) {
61 return TRUE;
64 ret = qio_channel_read(
65 chan, (gchar *)buf, len, NULL);
66 if (ret == 0) {
67 remove_fd_in_watch(chr);
68 qemu_chr_be_event(chr, CHR_EVENT_CLOSED);
69 return FALSE;
71 if (ret > 0) {
72 qemu_chr_be_write(chr, buf, ret);
75 return TRUE;
78 static int fd_chr_read_poll(void *opaque)
80 Chardev *chr = CHARDEV(opaque);
81 FDChardev *s = FD_CHARDEV(opaque);
83 s->max_size = qemu_chr_be_can_write(chr);
84 return s->max_size;
87 typedef struct FDSource {
88 GSource parent;
90 GIOCondition cond;
91 } FDSource;
93 static gboolean
94 fd_source_prepare(GSource *source,
95 gint *timeout_)
97 FDSource *src = (FDSource *)source;
99 return src->cond != 0;
102 static gboolean
103 fd_source_check(GSource *source)
105 FDSource *src = (FDSource *)source;
107 return src->cond != 0;
110 static gboolean
111 fd_source_dispatch(GSource *source, GSourceFunc callback,
112 gpointer user_data)
114 FDSource *src = (FDSource *)source;
115 FEWatchFunc func = (FEWatchFunc)callback;
116 gboolean ret = G_SOURCE_CONTINUE;
118 if (src->cond) {
119 ret = func(NULL, src->cond, user_data);
120 src->cond = 0;
123 return ret;
126 static GSourceFuncs fd_source_funcs = {
127 fd_source_prepare,
128 fd_source_check,
129 fd_source_dispatch,
130 NULL, NULL, NULL
133 static GSource *fd_source_new(FDChardev *chr)
135 return g_source_new(&fd_source_funcs, sizeof(FDSource));
138 static gboolean child_func(GIOChannel *source,
139 GIOCondition condition,
140 gpointer data)
142 FDSource *parent = data;
144 parent->cond |= condition;
146 return G_SOURCE_CONTINUE;
149 static GSource *fd_chr_add_watch(Chardev *chr, GIOCondition cond)
151 FDChardev *s = FD_CHARDEV(chr);
152 g_autoptr(GSource) source = fd_source_new(s);
154 if (s->ioc_out) {
155 g_autoptr(GSource) child = qio_channel_create_watch(s->ioc_out, cond & ~G_IO_IN);
156 g_source_set_callback(child, (GSourceFunc)child_func, source, NULL);
157 g_source_add_child_source(source, child);
159 if (s->ioc_in) {
160 g_autoptr(GSource) child = qio_channel_create_watch(s->ioc_in, cond & ~G_IO_OUT);
161 g_source_set_callback(child, (GSourceFunc)child_func, source, NULL);
162 g_source_add_child_source(source, child);
165 return g_steal_pointer(&source);
168 static void fd_chr_update_read_handler(Chardev *chr)
170 FDChardev *s = FD_CHARDEV(chr);
172 remove_fd_in_watch(chr);
173 if (s->ioc_in) {
174 chr->gsource = io_add_watch_poll(chr, s->ioc_in,
175 fd_chr_read_poll,
176 fd_chr_read, chr,
177 chr->gcontext);
181 static void char_fd_finalize(Object *obj)
183 Chardev *chr = CHARDEV(obj);
184 FDChardev *s = FD_CHARDEV(obj);
186 remove_fd_in_watch(chr);
187 if (s->ioc_in) {
188 object_unref(OBJECT(s->ioc_in));
190 if (s->ioc_out) {
191 object_unref(OBJECT(s->ioc_out));
194 qemu_chr_be_event(chr, CHR_EVENT_CLOSED);
197 int qmp_chardev_open_file_source(char *src, int flags, Error **errp)
199 int fd = -1;
201 TFR(fd = qemu_open_old(src, flags, 0666));
202 if (fd == -1) {
203 error_setg_file_open(errp, errno, src);
205 return fd;
208 /* open a character device to a unix fd */
209 void qemu_chr_open_fd(Chardev *chr,
210 int fd_in, int fd_out)
212 FDChardev *s = FD_CHARDEV(chr);
213 g_autofree char *name = NULL;
215 if (fd_out >= 0) {
216 qemu_set_nonblock(fd_out);
219 if (fd_out == fd_in && fd_in >= 0) {
220 s->ioc_in = QIO_CHANNEL(qio_channel_file_new_fd(fd_in));
221 name = g_strdup_printf("chardev-file-%s", chr->label);
222 qio_channel_set_name(QIO_CHANNEL(s->ioc_in), name);
223 s->ioc_out = QIO_CHANNEL(object_ref(s->ioc_in));
224 return;
227 if (fd_in >= 0) {
228 s->ioc_in = QIO_CHANNEL(qio_channel_file_new_fd(fd_in));
229 name = g_strdup_printf("chardev-file-in-%s", chr->label);
230 qio_channel_set_name(QIO_CHANNEL(s->ioc_in), name);
233 if (fd_out >= 0) {
234 s->ioc_out = QIO_CHANNEL(qio_channel_file_new_fd(fd_out));
235 g_free(name);
236 name = g_strdup_printf("chardev-file-out-%s", chr->label);
237 qio_channel_set_name(QIO_CHANNEL(s->ioc_out), name);
241 static void char_fd_class_init(ObjectClass *oc, void *data)
243 ChardevClass *cc = CHARDEV_CLASS(oc);
245 cc->chr_add_watch = fd_chr_add_watch;
246 cc->chr_write = fd_chr_write;
247 cc->chr_update_read_handler = fd_chr_update_read_handler;
250 static const TypeInfo char_fd_type_info = {
251 .name = TYPE_CHARDEV_FD,
252 .parent = TYPE_CHARDEV,
253 .instance_size = sizeof(FDChardev),
254 .instance_finalize = char_fd_finalize,
255 .class_init = char_fd_class_init,
256 .abstract = true,
259 static void register_types(void)
261 type_register_static(&char_fd_type_info);
264 type_init(register_types);