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* Copyright (C) 2011-2012 Red Hat, Inc.
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* This file is part of LVM2.
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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* of the GNU Lesser General Public License v.2.1.
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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#ifndef _LVM_DAEMON_COMMON_CLIENT_H
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#define _LVM_DAEMON_COMMON_CLIENT_H
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#include "libdevmapper.h"
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int socket_fd; /* the fd we use to talk to the daemon */
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int protocol_version; /* version of the protocol the daemon uses */
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const char *path; /* the binary of the daemon */
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const char *socket; /* path to the comms socket */
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unsigned autostart:1; /* start the daemon if not running? */
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* If the following are not NULL/0, an attempt to talk to a daemon which
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* uses a different protocol or version will fail.
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* The request looks like this:
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* arg_foo = "something"
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* something_special = "here"
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* knobs = [ "twiddle", "tweak" ]
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struct dm_config_tree *cft;
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int error; /* 0 for success */
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char *buffer; /* textual reply */
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struct dm_config_tree *cft; /* parsed reply, if available */
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* Open the communication channel to the daemon. If the daemon is not running,
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* it may be autostarted based on the binary path provided in the info (this
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* will only happen if autostart is set to true). If the call fails for any
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* reason, daemon_handle_valid(h) for the response will return false. Otherwise,
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* the connection is good to start serving requests.
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daemon_handle daemon_open(daemon_info i);
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* Send a request to the daemon, waiting for the reply. All communication with
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* the daemon is synchronous. The function handles the IO details and parses the
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* response, handling common error conditions. See "daemon_reply" for details.
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* In case the request contains a non-NULL buffer pointer, this buffer is sent
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* *verbatim* to the server. In this case, the cft pointer may be NULL (but will
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* be ignored even if non-NULL). If the buffer is NULL, the cft is required to
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* be a valid pointer, and is used to build up the request.
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daemon_reply daemon_send(daemon_handle h, daemon_request r);
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* A simple interface to daemon_send. This function just takes the command id
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* and possibly a list of parameters (of the form "name = %?", "value"). The
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* type (string, integer) of the value is indicated by a character substituted
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* for ? in %?: d for integer, s for string.
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daemon_reply daemon_send_simple(daemon_handle h, const char *id, ...);
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void daemon_reply_destroy(daemon_reply r);
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static inline int64_t daemon_reply_int(daemon_reply r, const char *path, int64_t def) {
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return dm_config_find_int64(r.cft->root, path, def);
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static inline const char *daemon_reply_str(daemon_reply r, const char *path, const char *def) {
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return dm_config_find_str(r.cft->root, path, def);
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/* Shut down the communication to the daemon. Compulsory. */
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void daemon_close(daemon_handle h);