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/*
Common routines between Xen store user library and daemon.
Copyright (C) 2005 Rusty Russell IBM Corporation
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef _XS_LIB_H
#define _XS_LIB_H
#include <stdbool.h>
#include <limits.h>
#include <xc.h>
/* Bitmask of permissions. */
enum xs_perm_type {
XS_PERM_NONE = 0,
XS_PERM_READ = 1,
XS_PERM_WRITE = 2,
/* Internal use. */
XS_PERM_CREATE = 4,
XS_PERM_OWNER = 8,
};
struct xs_permissions
{
domid_t id;
enum xs_perm_type perms;
};
/* Each 10 bits takes ~ 3 digits, plus one, plus one for nul terminator. */
#define MAX_STRLEN(x) ((sizeof(x) * CHAR_BIT + CHAR_BIT-1) / 10 * 3 + 2)
/* Path for various daemon things: env vars can override. */
const char *xs_daemon_socket(void);
const char *xs_daemon_socket_ro(void);
const char *xs_daemon_store(void);
const char *xs_daemon_transactions(void);
/* Simple write function: loops for you. */
bool xs_write_all(int fd, const void *data, unsigned int len);
/* Convert strings to permissions. False if a problem. */
bool xs_strings_to_perms(struct xs_permissions *perms, unsigned int num,
const char *strings);
/* Convert permissions to a string (up to len MAX_STRLEN(domid_t)+1). */
bool xs_perm_to_string(const struct xs_permissions *perm, char *buffer);
/* Given a string and a length, count how many strings (nul terms). */
unsigned int xs_count_strings(const char *strings, unsigned int len);
#endif /* _XS_LIB_H */
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