2 * Copyright (C) 2015 Red Hat, Inc.
4 * This file is part of the device-mapper multipath userspace tools.
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public License
8 * as published by the Free Software Foundation; either version 2
9 * of the License, or (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public License
17 * along with this program. If not, see <http://www.gnu.org/licenses/>.
20 #ifndef LIB_MPATH_CMD_H
21 #define LIB_MPATH_CMD_H
27 #define DEFAULT_SOCKET "/org/kernel/linux/storage/multipathd"
28 #define DEFAULT_REPLY_TIMEOUT 1000
29 #define MAX_REPLY_LEN 65536
34 * Connect to the running multipathd daemon. On systems with the
35 * multipathd.socket systemd unit file installed, this command will
36 * start multipathd if it is not already running. This function
37 * must be run before any of the others in this library
40 * A file descriptor on success. -1 on failure (with errno set).
42 int mpath_connect(void);
47 * Disconnect from the multipathd daemon. This function must be
48 * run after after processing all the multipath commands.
51 * 0 on success. -1 on failure (with errno set).
53 int mpath_disconnect(int fd);
58 * Send multipathd a command and return the reply. This function
59 * does the same as calling mpath_send_cmd() and then
63 * 0 on successs, and reply will either be NULL (if there was no
64 * reply data), or point to the reply string, which must be freed by
65 * the caller. -1 on failure (with errno set).
67 int mpath_process_cmd(int fd, const char *cmd, char **reply,
68 unsigned int timeout);
73 * Send a command to multipathd
76 * 0 on success. -1 on failure (with errno set)
78 int mpath_send_cmd(int fd, const char *cmd);
83 * Return a reply from multipathd for a previously sent command.
84 * This is equivalent to calling mpath_recv_reply_len(), allocating
85 * a buffer of the appropriate size, and then calling
86 * mpath_recv_reply_data() with that buffer.
89 * 0 on success, and reply will either be NULL (if there was no
90 * reply data), or point to the reply string, which must be freed by
91 * the caller, -1 on failure (with errno set).
93 int mpath_recv_reply(int fd, char **reply, unsigned int timeout);
98 * Return the size of the upcoming reply data from the sent multipath
99 * command. This must be called before calling mpath_recv_reply_data().
102 * The required size of the reply data buffer on success. -1 on
103 * failure (with errno set).
105 ssize_t mpath_recv_reply_len(int fd, unsigned int timeout);
110 * Return the reply data from the sent multipath command.
111 * mpath_recv_reply_len must be called first. reply must point to a
112 * buffer of len size.
115 * 0 on success, and reply will contain the reply data string. -1
116 * on failure (with errno set).
118 int mpath_recv_reply_data(int fd, char *reply, size_t len,
119 unsigned int timeout);
124 #endif /* LIB_MPATH_CMD_H */