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/*
* Copyright (c) 2018 Citrix Systems Inc.
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
#include "qemu/osdep.h"
#include "hw/xen/xen.h"
#include "hw/xen/xen-bus.h"
#include "hw/xen/xen-bus-helper.h"
#include "qapi/error.h"
#include "trace.h"
#include <glib/gprintf.h>
struct xs_state {
enum xenbus_state statenum;
const char *statestr;
};
#define XS_STATE(state) { state, #state }
static struct xs_state xs_state[] = {
XS_STATE(XenbusStateUnknown),
XS_STATE(XenbusStateInitialising),
XS_STATE(XenbusStateInitWait),
XS_STATE(XenbusStateInitialised),
XS_STATE(XenbusStateConnected),
XS_STATE(XenbusStateClosing),
XS_STATE(XenbusStateClosed),
XS_STATE(XenbusStateReconfiguring),
XS_STATE(XenbusStateReconfigured),
};
#undef XS_STATE
const char *xs_strstate(enum xenbus_state state)
{
unsigned int i;
for (i = 0; i < ARRAY_SIZE(xs_state); i++) {
if (xs_state[i].statenum == state) {
return xs_state[i].statestr;
}
}
return "INVALID";
}
void xs_node_create(struct qemu_xs_handle *h, xs_transaction_t tid,
const char *node, unsigned int owner, unsigned int domid,
unsigned int perms, Error **errp)
{
trace_xs_node_create(node);
if (!qemu_xen_xs_create(h, tid, owner, domid, perms, node)) {
error_setg_errno(errp, errno, "failed to create node '%s'", node);
}
}
void xs_node_destroy(struct qemu_xs_handle *h, xs_transaction_t tid,
const char *node, Error **errp)
{
trace_xs_node_destroy(node);
if (!qemu_xen_xs_destroy(h, tid, node)) {
error_setg_errno(errp, errno, "failed to destroy node '%s'", node);
}
}
void xs_node_vprintf(struct qemu_xs_handle *h, xs_transaction_t tid,
const char *node, const char *key, Error **errp,
const char *fmt, va_list ap)
{
char *path, *value;
int len;
path = (strlen(node) != 0) ? g_strdup_printf("%s/%s", node, key) :
g_strdup(key);
len = g_vasprintf(&value, fmt, ap);
trace_xs_node_vprintf(path, value);
if (!qemu_xen_xs_write(h, tid, path, value, len)) {
error_setg_errno(errp, errno, "failed to write '%s' to '%s'",
value, path);
}
g_free(value);
g_free(path);
}
void xs_node_printf(struct qemu_xs_handle *h, xs_transaction_t tid,
const char *node, const char *key, Error **errp,
const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
xs_node_vprintf(h, tid, node, key, errp, fmt, ap);
va_end(ap);
}
int xs_node_vscanf(struct qemu_xs_handle *h, xs_transaction_t tid,
const char *node, const char *key, Error **errp,
const char *fmt, va_list ap)
{
char *value;
int rc;
if (node && strlen(node) != 0) {
value = xs_node_read(h, tid, NULL, errp, "%s/%s", node, key);
} else {
value = xs_node_read(h, tid, NULL, errp, "%s", key);
}
if (value) {
rc = vsscanf(value, fmt, ap);
} else {
rc = EOF;
}
free(value);
return rc;
}
int xs_node_scanf(struct qemu_xs_handle *h, xs_transaction_t tid,
const char *node, const char *key, Error **errp,
const char *fmt, ...)
{
va_list ap;
int rc;
va_start(ap, fmt);
rc = xs_node_vscanf(h, tid, node, key, errp, fmt, ap);
va_end(ap);
return rc;
}
char *xs_node_read(struct qemu_xs_handle *h, xs_transaction_t tid,
unsigned int *len, Error **errp,
const char *path_fmt, ...)
{
char *path, *value;
va_list ap;
va_start(ap, path_fmt);
path = g_strdup_vprintf(path_fmt, ap);
va_end(ap);
value = qemu_xen_xs_read(h, tid, path, len);
trace_xs_node_read(path, value);
if (!value) {
error_setg_errno(errp, errno, "failed to read from '%s'", path);
}
g_free(path);
return value;
}
struct qemu_xs_watch *xs_node_watch(struct qemu_xs_handle *h, const char *node,
const char *key, xs_watch_fn fn,
void *opaque, Error **errp)
{
char *path;
struct qemu_xs_watch *w;
path = (strlen(node) != 0) ? g_strdup_printf("%s/%s", node, key) :
g_strdup(key);
trace_xs_node_watch(path);
w = qemu_xen_xs_watch(h, path, fn, opaque);
if (!w) {
error_setg_errno(errp, errno, "failed to watch node '%s'", path);
}
g_free(path);
return w;
}
void xs_node_unwatch(struct qemu_xs_handle *h, struct qemu_xs_watch *w)
{
qemu_xen_xs_unwatch(h, w);
}
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