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8#include "qemu/osdep.h"
9#include "hw/xen/xen.h"
10#include "hw/xen/xen-bus.h"
11#include "hw/xen/xen-bus-helper.h"
12#include "qapi/error.h"
13#include "trace.h"
14
15#include <glib/gprintf.h>
16
17struct xs_state {
18 enum xenbus_state statenum;
19 const char *statestr;
20};
21#define XS_STATE(state) { state, #state }
22
23static struct xs_state xs_state[] = {
24 XS_STATE(XenbusStateUnknown),
25 XS_STATE(XenbusStateInitialising),
26 XS_STATE(XenbusStateInitWait),
27 XS_STATE(XenbusStateInitialised),
28 XS_STATE(XenbusStateConnected),
29 XS_STATE(XenbusStateClosing),
30 XS_STATE(XenbusStateClosed),
31 XS_STATE(XenbusStateReconfiguring),
32 XS_STATE(XenbusStateReconfigured),
33};
34
35#undef XS_STATE
36
37const char *xs_strstate(enum xenbus_state state)
38{
39 unsigned int i;
40
41 for (i = 0; i < ARRAY_SIZE(xs_state); i++) {
42 if (xs_state[i].statenum == state) {
43 return xs_state[i].statestr;
44 }
45 }
46
47 return "INVALID";
48}
49
50void xs_node_create(struct qemu_xs_handle *h, xs_transaction_t tid,
51 const char *node, unsigned int owner, unsigned int domid,
52 unsigned int perms, Error **errp)
53{
54 trace_xs_node_create(node);
55
56 if (!qemu_xen_xs_create(h, tid, owner, domid, perms, node)) {
57 error_setg_errno(errp, errno, "failed to create node '%s'", node);
58 }
59}
60
61void xs_node_destroy(struct qemu_xs_handle *h, xs_transaction_t tid,
62 const char *node, Error **errp)
63{
64 trace_xs_node_destroy(node);
65
66 if (!qemu_xen_xs_destroy(h, tid, node)) {
67 error_setg_errno(errp, errno, "failed to destroy node '%s'", node);
68 }
69}
70
71void xs_node_vprintf(struct qemu_xs_handle *h, xs_transaction_t tid,
72 const char *node, const char *key, Error **errp,
73 const char *fmt, va_list ap)
74{
75 char *path, *value;
76 int len;
77
78 path = (strlen(node) != 0) ? g_strdup_printf("%s/%s", node, key) :
79 g_strdup(key);
80 len = g_vasprintf(&value, fmt, ap);
81
82 trace_xs_node_vprintf(path, value);
83
84 if (!qemu_xen_xs_write(h, tid, path, value, len)) {
85 error_setg_errno(errp, errno, "failed to write '%s' to '%s'",
86 value, path);
87 }
88
89 g_free(value);
90 g_free(path);
91}
92
93void xs_node_printf(struct qemu_xs_handle *h, xs_transaction_t tid,
94 const char *node, const char *key, Error **errp,
95 const char *fmt, ...)
96{
97 va_list ap;
98
99 va_start(ap, fmt);
100 xs_node_vprintf(h, tid, node, key, errp, fmt, ap);
101 va_end(ap);
102}
103
104int xs_node_vscanf(struct qemu_xs_handle *h, xs_transaction_t tid,
105 const char *node, const char *key, Error **errp,
106 const char *fmt, va_list ap)
107{
108 char *path, *value;
109 int rc;
110
111 path = (strlen(node) != 0) ? g_strdup_printf("%s/%s", node, key) :
112 g_strdup(key);
113 value = qemu_xen_xs_read(h, tid, path, NULL);
114
115 trace_xs_node_vscanf(path, value);
116
117 if (value) {
118 rc = vsscanf(value, fmt, ap);
119 } else {
120 error_setg_errno(errp, errno, "failed to read from '%s'",
121 path);
122 rc = EOF;
123 }
124
125 free(value);
126 g_free(path);
127
128 return rc;
129}
130
131int xs_node_scanf(struct qemu_xs_handle *h, xs_transaction_t tid,
132 const char *node, const char *key, Error **errp,
133 const char *fmt, ...)
134{
135 va_list ap;
136 int rc;
137
138 va_start(ap, fmt);
139 rc = xs_node_vscanf(h, tid, node, key, errp, fmt, ap);
140 va_end(ap);
141
142 return rc;
143}
144
145struct qemu_xs_watch *xs_node_watch(struct qemu_xs_handle *h, const char *node,
146 const char *key, xs_watch_fn fn,
147 void *opaque, Error **errp)
148{
149 char *path;
150 struct qemu_xs_watch *w;
151
152 path = (strlen(node) != 0) ? g_strdup_printf("%s/%s", node, key) :
153 g_strdup(key);
154
155 trace_xs_node_watch(path);
156
157 w = qemu_xen_xs_watch(h, path, fn, opaque);
158 if (!w) {
159 error_setg_errno(errp, errno, "failed to watch node '%s'", path);
160 }
161
162 g_free(path);
163
164 return w;
165}
166
167void xs_node_unwatch(struct qemu_xs_handle *h, struct qemu_xs_watch *w)
168{
169 qemu_xen_xs_unwatch(h, w);
170}
171
