Release 4.7 include/xen/interface/io/xs_wire.h

/*
 * Details of the "wire" protocol between Xen Store Daemon and client
 * library or guest kernel.
 * Copyright (C) 2005 Rusty Russell IBM Corporation
 */

#ifndef _XS_WIRE_H

#define _XS_WIRE_H


enum xsd_sockmsg_type
{
    
XS_DEBUG,
    
XS_DIRECTORY,
    
XS_READ,
    
XS_GET_PERMS,
    
XS_WATCH,
    
XS_UNWATCH,
    
XS_TRANSACTION_START,
    
XS_TRANSACTION_END,
    
XS_INTRODUCE,
    
XS_RELEASE,
    
XS_GET_DOMAIN_PATH,
    
XS_WRITE,
    
XS_MKDIR,
    
XS_RM,
    
XS_SET_PERMS,
    
XS_WATCH_EVENT,
    
XS_ERROR,
    
XS_IS_DOMAIN_INTRODUCED,
    
XS_RESUME,
    
XS_SET_TARGET,
    
XS_RESTRICT,
    
XS_RESET_WATCHES,
};


#define XS_WRITE_NONE "NONE"

#define XS_WRITE_CREATE "CREATE"

#define XS_WRITE_CREATE_EXCL "CREATE|EXCL"

/* We hand errors as strings, for portability. */

struct xsd_errors
{
    
int errnum;
    
const char *errstring;
};

#define XSD_ERROR(x) { x, #x }

static struct xsd_errors xsd_errors[] __attribute__((unused)) = {
    XSD_ERROR(EINVAL),
    XSD_ERROR(EACCES),
    XSD_ERROR(EEXIST),
    XSD_ERROR(EISDIR),
    XSD_ERROR(ENOENT),
    XSD_ERROR(ENOMEM),
    XSD_ERROR(ENOSPC),
    XSD_ERROR(EIO),
    XSD_ERROR(ENOTEMPTY),
    XSD_ERROR(ENOSYS),
    XSD_ERROR(EROFS),
    XSD_ERROR(EBUSY),
    XSD_ERROR(EAGAIN),
    XSD_ERROR(EISCONN)
};


struct xsd_sockmsg
{
    
uint32_t type;  /* XS_??? */
    
uint32_t req_id;/* Request identifier, echoed in daemon's response.  */
    
uint32_t tx_id; /* Transaction id (0 if not related to a transaction). */
    
uint32_t len;   /* Length of data following this. */

    /* Generally followed by nul-terminated string(s). */
};


enum xs_watch_type
{
    
XS_WATCH_PATH = 0,
    
XS_WATCH_TOKEN
};

/* Inter-domain shared memory communications. */

#define XENSTORE_RING_SIZE 1024

typedef uint32_t XENSTORE_RING_IDX;

#define MASK_XENSTORE_IDX(idx) ((idx) & (XENSTORE_RING_SIZE-1))

struct xenstore_domain_interface {
    
char req[XENSTORE_RING_SIZE]; /* Requests to xenstore daemon. */
    
char rsp[XENSTORE_RING_SIZE]; /* Replies and async watch events. */
    

XENSTORE_RING_IDX req_cons, req_prod;
    

XENSTORE_RING_IDX rsp_cons, rsp_prod;
};

/* Violating this is very bad.  See docs/misc/xenstore.txt. */

#define XENSTORE_PAYLOAD_MAX 4096

#endif /* _XS_WIRE_H */
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Directory: include/xen/interface/io

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