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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef XENBUS_H__
#define XENBUS_H__
#include <xen/interface/xen.h>
#include <xen/interface/io/xenbus.h>
typedef unsigned long xenbus_transaction_t;
#define XBT_NIL ((xenbus_transaction_t)0)
extern u32 xenbus_evtchn;
/* Initialize the XenBus system. */
void init_xenbus(void);
/* Finalize the XenBus system. */
void fini_xenbus(void);
/**
* xenbus_read() - Read the value associated with a path.
*
* Returns a malloc'd error string on failure and sets *value to NULL.
* On success, *value is set to a malloc'd copy of the value.
*/
char *xenbus_read(xenbus_transaction_t xbt, const char *path, char **value);
char *xenbus_wait_for_state_change(const char *path, XenbusState *state);
char *xenbus_switch_state(xenbus_transaction_t xbt, const char *path,
XenbusState state);
/**
* xenbus_write() - Associates a value with a path.
*
* Returns a malloc'd error string on failure.
*/
char *xenbus_write(xenbus_transaction_t xbt, const char *path,
const char *value);
/**
* xenbus_rm() - Removes the value associated with a path.
*
* Returns a malloc'd error string on failure.
*/
char *xenbus_rm(xenbus_transaction_t xbt, const char *path);
/**
* xenbus_ls() - List the contents of a directory.
*
* Returns a malloc'd error string on failure and sets *contents to NULL.
* On success, *contents is set to a malloc'd array of pointers to malloc'd
* strings. The array is NULL terminated. May block.
*/
char *xenbus_ls(xenbus_transaction_t xbt, const char *prefix, char ***contents);
/**
* xenbus_get_perms() - Reads permissions associated with a path.
*
* Returns a malloc'd error string on failure and sets *value to NULL.
* On success, *value is set to a malloc'd copy of the value.
*/
char *xenbus_get_perms(xenbus_transaction_t xbt, const char *path, char **value);
/**
* xenbus_set_perms() - Sets the permissions associated with a path.
*
* Returns a malloc'd error string on failure.
*/
char *xenbus_set_perms(xenbus_transaction_t xbt, const char *path, domid_t dom,
char perm);
/**
* xenbus_transaction_start() - Start a xenbus transaction.
*
* Returns the transaction in xbt on success or a malloc'd error string
* otherwise.
*/
char *xenbus_transaction_start(xenbus_transaction_t *xbt);
/**
* xenbus_transaction_end() - End a xenbus transaction.
*
* Returns a malloc'd error string if it fails. Abort says whether the
* transaction should be aborted.
* Returns 1 in *retry if the transaction should be retried.
*/
char *xenbus_transaction_end(xenbus_transaction_t xbt, int abort,
int *retry);
/**
* xenbus_read_integer() - Read path and parse it as an integer.
*
* Returns -1 on error.
*/
int xenbus_read_integer(const char *path);
/**
* xenbus_read_uuid() - Read path and parse it as 16 byte uuid.
*
* Returns 1 if read and parsing were successful, 0 if not
*/
int xenbus_read_uuid(const char *path, unsigned char uuid[16]);
/**
* xenbus_printf() - Contraction of snprintf and xenbus_write(path/node).
*/
char *xenbus_printf(xenbus_transaction_t xbt,
const char *node, const char *path,
const char *fmt, ...)
__attribute__((__format__(printf, 4, 5)));
/**
* xenbus_get_self_id() - Utility function to figure out our domain id
*/
domid_t xenbus_get_self_id(void);
#endif /* XENBUS_H__ */
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