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lvm2/daemons/common/daemon-client.h

60 lines
2.0 KiB
C

/*
* Copyright (C) 2011 Red Hat, Inc. All rights reserved.
*
* This file is part of LVM2.
*
* This copyrighted material is made available to anyone wishing to use,
* modify, copy, or redistribute it subject to the terms and conditions
* of the GNU Lesser General Public License v.2.1.
*
* You should have received a copy of the GNU Lesser 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 _LVM_DAEMON_COMMON_CLIENT_H
#define _LVM_DAEMON_COMMON_CLIENT_H
typedef struct {
int socket_fd; /* the fd we use to talk to the daemon */
int protocol; /* version of the protocol the daemon uses */
char *read_buf;
} daemon_handle;
typedef struct {
const char *path; /* the binary of the daemon */
const char *socket; /* path to the comms socket */
unsigned autostart:1; /* start the daemon if not running? */
} daemon_info;
typedef struct {
char *request;
} daemon_request;
typedef struct {
int error; /* 0 for success */
char *reply; /* textual reply */
struct config_tree *cft; /* parsed reply, if available */
} daemon_reply;
/*
* Open the communication channel to the daemon. If the daemon is not running,
* it may be autostarted based on the binary path provided in the info (this
* will only happen if autostart is set to true). If the call fails for any
* reason, daemon_handle_valid(h) for the response will return false. Otherwise,
* the connection is good to start serving requests.
*/
daemon_handle daemon_open(daemon_info i);
/*
* Send a request to the daemon, waiting for the reply. All communication with
* the daemon is synchronous. The function handles the IO details and parses the
* response, handling common error conditions. See "daemon_reply" for details.
*/
daemon_reply daemon_send(daemon_handle h, daemon_request r);
/* Shut down the communication to the daemon. Compulsory. */
void daemon_close(daemon_handle h);
#endif