tests: Add a tester for HMP commands
[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 #include "qemu/osdep.h"
25 #include "qemu/sockets.h"
26 #include "qapi/error.h"
27 #include "qemu-common.h"
28 #include "sysemu/char.h"
29 #include "io/channel-file.h"
30
31 #include "char-fd.h"
32 #include "char-io.h"
33
34 /* Called with chr_write_lock held. */
35 static int fd_chr_write(Chardev *chr, const uint8_t *buf, int len)
36 {
37 FDChardev *s = FD_CHARDEV(chr);
38
39 return io_channel_send(s->ioc_out, buf, len);
40 }
41
42 static gboolean fd_chr_read(QIOChannel *chan, GIOCondition cond, void *opaque)
43 {
44 Chardev *chr = CHARDEV(opaque);
45 FDChardev *s = FD_CHARDEV(opaque);
46 int len;
47 uint8_t buf[CHR_READ_BUF_LEN];
48 ssize_t ret;
49
50 len = sizeof(buf);
51 if (len > s->max_size) {
52 len = s->max_size;
53 }
54 if (len == 0) {
55 return TRUE;
56 }
57
58 ret = qio_channel_read(
59 chan, (gchar *)buf, len, NULL);
60 if (ret == 0) {
61 remove_fd_in_watch(chr, NULL);
62 qemu_chr_be_event(chr, CHR_EVENT_CLOSED);
63 return FALSE;
64 }
65 if (ret > 0) {
66 qemu_chr_be_write(chr, buf, ret);
67 }
68
69 return TRUE;
70 }
71
72 static int fd_chr_read_poll(void *opaque)
73 {
74 Chardev *chr = CHARDEV(opaque);
75 FDChardev *s = FD_CHARDEV(opaque);
76
77 s->max_size = qemu_chr_be_can_write(chr);
78 return s->max_size;
79 }
80
81 static GSource *fd_chr_add_watch(Chardev *chr, GIOCondition cond)
82 {
83 FDChardev *s = FD_CHARDEV(chr);
84 return qio_channel_create_watch(s->ioc_out, cond);
85 }
86
87 static void fd_chr_update_read_handler(Chardev *chr,
88 GMainContext *context)
89 {
90 FDChardev *s = FD_CHARDEV(chr);
91
92 remove_fd_in_watch(chr, NULL);
93 if (s->ioc_in) {
94 chr->fd_in_tag = io_add_watch_poll(chr, s->ioc_in,
95 fd_chr_read_poll,
96 fd_chr_read, chr,
97 context);
98 }
99 }
100
101 static void char_fd_finalize(Object *obj)
102 {
103 Chardev *chr = CHARDEV(obj);
104 FDChardev *s = FD_CHARDEV(obj);
105
106 remove_fd_in_watch(chr, NULL);
107 if (s->ioc_in) {
108 object_unref(OBJECT(s->ioc_in));
109 }
110 if (s->ioc_out) {
111 object_unref(OBJECT(s->ioc_out));
112 }
113
114 qemu_chr_be_event(chr, CHR_EVENT_CLOSED);
115 }
116
117 int qmp_chardev_open_file_source(char *src, int flags, Error **errp)
118 {
119 int fd = -1;
120
121 TFR(fd = qemu_open(src, flags, 0666));
122 if (fd == -1) {
123 error_setg_file_open(errp, errno, src);
124 }
125 return fd;
126 }
127
128 /* open a character device to a unix fd */
129 void qemu_chr_open_fd(Chardev *chr,
130 int fd_in, int fd_out)
131 {
132 FDChardev *s = FD_CHARDEV(chr);
133 char *name;
134
135 s->ioc_in = QIO_CHANNEL(qio_channel_file_new_fd(fd_in));
136 name = g_strdup_printf("chardev-file-in-%s", chr->label);
137 qio_channel_set_name(QIO_CHANNEL(s->ioc_in), name);
138 g_free(name);
139 s->ioc_out = QIO_CHANNEL(qio_channel_file_new_fd(fd_out));
140 name = g_strdup_printf("chardev-file-out-%s", chr->label);
141 qio_channel_set_name(QIO_CHANNEL(s->ioc_out), name);
142 g_free(name);
143 qemu_set_nonblock(fd_out);
144 s->chr = chr;
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);