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1/* dotlock.h - dotfile locking declarations
2 * Copyright (C) 2000, 2001, 2006, 2011 Free Software Foundation, Inc.
3 *
4 * This file is part of JNLIB, which is a subsystem of GnuPG.
5 *
6 * JNLIB is free software; you can redistribute it and/or modify it
7 * under the terms of either
8 *
9 * - the GNU Lesser General Public License as published by the Free
10 * Software Foundation; either version 3 of the License, or (at
11 * your option) any later version.
12 *
13 * or
14 *
15 * - the GNU General Public License as published by the Free
16 * Software Foundation; either version 2 of the License, or (at
17 * your option) any later version.
18 *
19 * or both in parallel, as here.
20 *
21 * JNLIB is distributed in the hope that it will be useful, but
22 * WITHOUT ANY WARRANTY; without even the implied warranty of
23 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
24 * General Public License for more details.
25 *
26 * You should have received a copies of the GNU General Public License
27 * and the GNU Lesser General Public License along with this program;
28 * if not, see <http://www.gnu.org/licenses/>.
29 *
30 * ALTERNATIVELY, this file may be distributed under the terms of the
31 * following license, in which case the provisions of this license are
32 * required INSTEAD OF the GNU Lesser General License or the GNU
33 * General Public License. If you wish to allow use of your version of
34 * this file only under the terms of the GNU Lesser General License or
35 * the GNU General Public License, and not to allow others to use your
36 * version of this file under the terms of the following license,
37 * indicate your decision by deleting this paragraph and the license
38 * below.
39 *
40 * Redistribution and use in source and binary forms, with or without
41 * modification, are permitted provided that the following conditions
42 * are met:
43 *
44 * 1. Redistributions of source code must retain the above copyright
45 * notice, and the entire permission notice in its entirety,
46 * including the disclaimer of warranties.
47 * 2. Redistributions in binary form must reproduce the above copyright
48 * notice, this list of conditions and the following disclaimer in the
49 * documentation and/or other materials provided with the distribution.
50 * 3. The name of the author may not be used to endorse or promote
51 * products derived from this software without specific prior
52 * written permission.
53 *
54 * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
55 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
56 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
57 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
58 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
59 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
60 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
61 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
62 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
63 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
64 * OF THE POSSIBILITY OF SUCH DAMAGE.
65 */
66
67#ifndef LIBJNLIB_DOTLOCK_H
68#define LIBJNLIB_DOTLOCK_H
69
70/* See dotlock.c for a description. */
71
72#ifdef DOTLOCK_EXT_SYM_PREFIX
73# ifndef _DOTLOCK_PREFIX
74# define _DOTLOCK_PREFIX1(x,y) x ## y
75# define _DOTLOCK_PREFIX2(x,y) _DOTLOCK_PREFIX1(x,y)
76# define _DOTLOCK_PREFIX(x) _DOTLOCK_PREFIX2(DOTLOCK_EXT_SYM_PREFIX,x)
77# endif /*_DOTLOCK_PREFIX*/
78# define dotlock_disable _DOTLOCK_PREFIX(dotlock_disable)
79# define dotlock_create _DOTLOCK_PREFIX(dotlock_create)
80# define dotlock_set_fd _DOTLOCK_PREFIX(dotlock_set_fd)
81# define dotlock_get_fd _DOTLOCK_PREFIX(dotlock_get_fd)
82# define dotlock_destroy _DOTLOCK_PREFIX(dotlock_destroy)
83# define dotlock_take _DOTLOCK_PREFIX(dotlock_take)
84# define dotlock_release _DOTLOCK_PREFIX(dotlock_release)
85# define dotlock_remove_lockfiles _DOTLOCK_PREFIX(dotlock_remove_lockfiles)
86#endif /*DOTLOCK_EXT_SYM_PREFIX*/
87
88#ifdef __cplusplus
89extern "C"
90{
91#if 0
92}
93#endif
94#endif
95
96
97struct dotlock_handle;
98typedef struct dotlock_handle *dotlock_t;
99
100void dotlock_disable (void);
101dotlock_t dotlock_create (const char *file_to_lock, unsigned int flags);
102void dotlock_set_fd (dotlock_t h, int fd);
103int dotlock_get_fd (dotlock_t h);
104void dotlock_destroy (dotlock_t h);
105int dotlock_take (dotlock_t h, long timeout);
106int dotlock_release (dotlock_t h);
107void dotlock_remove_lockfiles (void);
108
109#ifdef __cplusplus
110}
111#endif
112#endif /*LIBJNLIB_DOTLOCK_H*/