tests: virtio-9p: add version operation test
[qemu.git] / backends / rng.c
1 /*
2 * QEMU Random Number Generator Backend
3 *
4 * Copyright IBM, Corp. 2012
5 *
6 * Authors:
7 * Anthony Liguori <aliguori@us.ibm.com>
8 *
9 * This work is licensed under the terms of the GNU GPL, version 2 or later.
10 * See the COPYING file in the top-level directory.
11 */
12
13 #include "qemu/osdep.h"
14 #include "sysemu/rng.h"
15 #include "qapi/error.h"
16 #include "qapi/qmp/qerror.h"
17 #include "qom/object_interfaces.h"
18
19 void rng_backend_request_entropy(RngBackend *s, size_t size,
20 EntropyReceiveFunc *receive_entropy,
21 void *opaque)
22 {
23 RngBackendClass *k = RNG_BACKEND_GET_CLASS(s);
24 RngRequest *req;
25
26 if (k->request_entropy) {
27 req = g_malloc(sizeof(*req));
28
29 req->offset = 0;
30 req->size = size;
31 req->receive_entropy = receive_entropy;
32 req->opaque = opaque;
33 req->data = g_malloc(req->size);
34
35 k->request_entropy(s, req);
36
37 QSIMPLEQ_INSERT_TAIL(&s->requests, req, next);
38 }
39 }
40
41 static bool rng_backend_prop_get_opened(Object *obj, Error **errp)
42 {
43 RngBackend *s = RNG_BACKEND(obj);
44
45 return s->opened;
46 }
47
48 static void rng_backend_complete(UserCreatable *uc, Error **errp)
49 {
50 object_property_set_bool(OBJECT(uc), true, "opened", errp);
51 }
52
53 static void rng_backend_prop_set_opened(Object *obj, bool value, Error **errp)
54 {
55 RngBackend *s = RNG_BACKEND(obj);
56 RngBackendClass *k = RNG_BACKEND_GET_CLASS(s);
57 Error *local_err = NULL;
58
59 if (value == s->opened) {
60 return;
61 }
62
63 if (!value && s->opened) {
64 error_setg(errp, QERR_PERMISSION_DENIED);
65 return;
66 }
67
68 if (k->opened) {
69 k->opened(s, &local_err);
70 if (local_err) {
71 error_propagate(errp, local_err);
72 return;
73 }
74 }
75
76 s->opened = true;
77 }
78
79 static void rng_backend_free_request(RngRequest *req)
80 {
81 g_free(req->data);
82 g_free(req);
83 }
84
85 static void rng_backend_free_requests(RngBackend *s)
86 {
87 RngRequest *req, *next;
88
89 QSIMPLEQ_FOREACH_SAFE(req, &s->requests, next, next) {
90 rng_backend_free_request(req);
91 }
92
93 QSIMPLEQ_INIT(&s->requests);
94 }
95
96 void rng_backend_finalize_request(RngBackend *s, RngRequest *req)
97 {
98 QSIMPLEQ_REMOVE(&s->requests, req, RngRequest, next);
99 rng_backend_free_request(req);
100 }
101
102 static void rng_backend_init(Object *obj)
103 {
104 RngBackend *s = RNG_BACKEND(obj);
105
106 QSIMPLEQ_INIT(&s->requests);
107
108 object_property_add_bool(obj, "opened",
109 rng_backend_prop_get_opened,
110 rng_backend_prop_set_opened,
111 NULL);
112 }
113
114 static void rng_backend_finalize(Object *obj)
115 {
116 RngBackend *s = RNG_BACKEND(obj);
117
118 rng_backend_free_requests(s);
119 }
120
121 static void rng_backend_class_init(ObjectClass *oc, void *data)
122 {
123 UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc);
124
125 ucc->complete = rng_backend_complete;
126 }
127
128 static const TypeInfo rng_backend_info = {
129 .name = TYPE_RNG_BACKEND,
130 .parent = TYPE_OBJECT,
131 .instance_size = sizeof(RngBackend),
132 .instance_init = rng_backend_init,
133 .instance_finalize = rng_backend_finalize,
134 .class_size = sizeof(RngBackendClass),
135 .class_init = rng_backend_class_init,
136 .abstract = true,
137 .interfaces = (InterfaceInfo[]) {
138 { TYPE_USER_CREATABLE },
139 { }
140 }
141 };
142
143 static void register_types(void)
144 {
145 type_register_static(&rng_backend_info);
146 }
147
148 type_init(register_types);