linux-user: save auxv length
[qemu.git] / spice-qemu-char.c
1 #include "config-host.h"
2 #include "trace.h"
3 #include "ui/qemu-spice.h"
4 #include <spice.h>
5 #include <spice-experimental.h>
6
7 #include "osdep.h"
8
9 #define dprintf(_scd, _level, _fmt, ...) \
10 do { \
11 static unsigned __dprintf_counter = 0; \
12 if (_scd->debug >= _level) { \
13 fprintf(stderr, "scd: %3d: " _fmt, ++__dprintf_counter, ## __VA_ARGS__);\
14 } \
15 } while (0)
16
17 #define VMC_MAX_HOST_WRITE 2048
18
19 typedef struct SpiceCharDriver {
20 CharDriverState* chr;
21 SpiceCharDeviceInstance sin;
22 char *subtype;
23 bool active;
24 uint8_t *buffer;
25 uint8_t *datapos;
26 ssize_t bufsize, datalen;
27 uint32_t debug;
28 } SpiceCharDriver;
29
30 static int vmc_write(SpiceCharDeviceInstance *sin, const uint8_t *buf, int len)
31 {
32 SpiceCharDriver *scd = container_of(sin, SpiceCharDriver, sin);
33 ssize_t out = 0;
34 ssize_t last_out;
35 uint8_t* p = (uint8_t*)buf;
36
37 while (len > 0) {
38 last_out = MIN(len, VMC_MAX_HOST_WRITE);
39 if (qemu_chr_be_can_write(scd->chr) < last_out) {
40 break;
41 }
42 qemu_chr_be_write(scd->chr, p, last_out);
43 out += last_out;
44 len -= last_out;
45 p += last_out;
46 }
47
48 dprintf(scd, 3, "%s: %zu/%zd\n", __func__, out, len + out);
49 trace_spice_vmc_write(out, len + out);
50 return out;
51 }
52
53 static int vmc_read(SpiceCharDeviceInstance *sin, uint8_t *buf, int len)
54 {
55 SpiceCharDriver *scd = container_of(sin, SpiceCharDriver, sin);
56 int bytes = MIN(len, scd->datalen);
57
58 dprintf(scd, 2, "%s: %p %d/%d/%zd\n", __func__, scd->datapos, len, bytes, scd->datalen);
59 if (bytes > 0) {
60 memcpy(buf, scd->datapos, bytes);
61 scd->datapos += bytes;
62 scd->datalen -= bytes;
63 assert(scd->datalen >= 0);
64 if (scd->datalen == 0) {
65 scd->datapos = 0;
66 }
67 }
68 trace_spice_vmc_read(bytes, len);
69 return bytes;
70 }
71
72 static void vmc_state(SpiceCharDeviceInstance *sin, int connected)
73 {
74 SpiceCharDriver *scd = container_of(sin, SpiceCharDriver, sin);
75
76 #if SPICE_SERVER_VERSION < 0x000901
77 /*
78 * spice-server calls the state callback for the agent channel when the
79 * spice client connects / disconnects. Given that not the client but
80 * the server is doing the parsing of the messages this is wrong as the
81 * server is still listening. Worse, this causes the parser in the server
82 * to go out of sync, so we ignore state calls for subtype vdagent
83 * spicevmc chardevs. For the full story see:
84 * http://lists.freedesktop.org/archives/spice-devel/2011-July/004837.html
85 */
86 if (strcmp(sin->subtype, "vdagent") == 0) {
87 return;
88 }
89 #endif
90
91 if ((scd->chr->opened && connected) ||
92 (!scd->chr->opened && !connected)) {
93 return;
94 }
95
96 qemu_chr_be_event(scd->chr,
97 connected ? CHR_EVENT_OPENED : CHR_EVENT_CLOSED);
98 }
99
100 static SpiceCharDeviceInterface vmc_interface = {
101 .base.type = SPICE_INTERFACE_CHAR_DEVICE,
102 .base.description = "spice virtual channel char device",
103 .base.major_version = SPICE_INTERFACE_CHAR_DEVICE_MAJOR,
104 .base.minor_version = SPICE_INTERFACE_CHAR_DEVICE_MINOR,
105 .state = vmc_state,
106 .write = vmc_write,
107 .read = vmc_read,
108 };
109
110
111 static void vmc_register_interface(SpiceCharDriver *scd)
112 {
113 if (scd->active) {
114 return;
115 }
116 dprintf(scd, 1, "%s\n", __func__);
117 scd->sin.base.sif = &vmc_interface.base;
118 qemu_spice_add_interface(&scd->sin.base);
119 scd->active = true;
120 trace_spice_vmc_register_interface(scd);
121 }
122
123 static void vmc_unregister_interface(SpiceCharDriver *scd)
124 {
125 if (!scd->active) {
126 return;
127 }
128 dprintf(scd, 1, "%s\n", __func__);
129 spice_server_remove_interface(&scd->sin.base);
130 scd->active = false;
131 trace_spice_vmc_unregister_interface(scd);
132 }
133
134
135 static int spice_chr_write(CharDriverState *chr, const uint8_t *buf, int len)
136 {
137 SpiceCharDriver *s = chr->opaque;
138
139 dprintf(s, 2, "%s: %d\n", __func__, len);
140 vmc_register_interface(s);
141 assert(s->datalen == 0);
142 if (s->bufsize < len) {
143 s->bufsize = len;
144 s->buffer = g_realloc(s->buffer, s->bufsize);
145 }
146 memcpy(s->buffer, buf, len);
147 s->datapos = s->buffer;
148 s->datalen = len;
149 spice_server_char_device_wakeup(&s->sin);
150 return len;
151 }
152
153 static void spice_chr_close(struct CharDriverState *chr)
154 {
155 SpiceCharDriver *s = chr->opaque;
156
157 printf("%s\n", __func__);
158 vmc_unregister_interface(s);
159 g_free(s);
160 }
161
162 static void spice_chr_guest_open(struct CharDriverState *chr)
163 {
164 SpiceCharDriver *s = chr->opaque;
165 vmc_register_interface(s);
166 }
167
168 static void spice_chr_guest_close(struct CharDriverState *chr)
169 {
170 SpiceCharDriver *s = chr->opaque;
171 vmc_unregister_interface(s);
172 }
173
174 static void print_allowed_subtypes(void)
175 {
176 const char** psubtype;
177 int i;
178
179 fprintf(stderr, "allowed names: ");
180 for(i=0, psubtype = spice_server_char_device_recognized_subtypes();
181 *psubtype != NULL; ++psubtype, ++i) {
182 if (i == 0) {
183 fprintf(stderr, "%s", *psubtype);
184 } else {
185 fprintf(stderr, ", %s", *psubtype);
186 }
187 }
188 fprintf(stderr, "\n");
189 }
190
191 int qemu_chr_open_spice(QemuOpts *opts, CharDriverState **_chr)
192 {
193 CharDriverState *chr;
194 SpiceCharDriver *s;
195 const char* name = qemu_opt_get(opts, "name");
196 uint32_t debug = qemu_opt_get_number(opts, "debug", 0);
197 const char** psubtype = spice_server_char_device_recognized_subtypes();
198 const char *subtype = NULL;
199
200 if (name == NULL) {
201 fprintf(stderr, "spice-qemu-char: missing name parameter\n");
202 print_allowed_subtypes();
203 return -EINVAL;
204 }
205 for(;*psubtype != NULL; ++psubtype) {
206 if (strcmp(name, *psubtype) == 0) {
207 subtype = *psubtype;
208 break;
209 }
210 }
211 if (subtype == NULL) {
212 fprintf(stderr, "spice-qemu-char: unsupported name\n");
213 print_allowed_subtypes();
214 return -EINVAL;
215 }
216
217 chr = g_malloc0(sizeof(CharDriverState));
218 s = g_malloc0(sizeof(SpiceCharDriver));
219 s->chr = chr;
220 s->debug = debug;
221 s->active = false;
222 s->sin.subtype = subtype;
223 chr->opaque = s;
224 chr->chr_write = spice_chr_write;
225 chr->chr_close = spice_chr_close;
226 chr->chr_guest_open = spice_chr_guest_open;
227 chr->chr_guest_close = spice_chr_guest_close;
228
229 #if SPICE_SERVER_VERSION < 0x000901
230 /* See comment in vmc_state() */
231 if (strcmp(subtype, "vdagent") == 0) {
232 qemu_chr_generic_open(chr);
233 }
234 #endif
235
236 *_chr = chr;
237 return 0;
238 }