1 /*
2 * Copyright (c) 2014 Red Hat, Inc.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26 /*
27 FUNCTION
28 <<__fsetlocking>>---set or query locking mode on FILE stream
29
30 INDEX
31 __fsetlocking
32
33 SYNOPSIS
34 #include <stdio.h>
35 #include <stdio_ext.h>
36 int __fsetlocking(FILE *<[fp]>, int <[type]>);
37
38 DESCRIPTION
39 This function sets how the stdio functions handle locking of FILE <[fp]>.
40 The following values describe <[type]>:
41
42 <<FSETLOCKING_INTERNAL>> is the default state, where stdio functions
43 automatically lock and unlock the stream.
44
45 <<FSETLOCKING_BYCALLER>> means that automatic locking in stdio functions
46 is disabled. Applications which set this take all responsibility for file
47 locking themselves.
48
49 <<FSETLOCKING_QUERY>> returns the current locking mode without changing it.
50
51 RETURNS
52 <<__fsetlocking>> returns the current locking mode of <[fp]>.
53
54 PORTABILITY
55 This function originates from Solaris and is also provided by GNU libc.
56
57 No supporting OS subroutines are required.
58 */
59
60 #ifndef __rtems__
61
62 #define _DEFAULT_SOURCE
63 #include <_ansi.h>
64 #include <stdio.h>
65 #include <stdio_ext.h>
66 #include "local.h"
67
68 int
__fsetlocking(FILE * fp,int type)69 __fsetlocking (FILE * fp,
70 int type)
71 {
72 int result;
73 CHECK_INIT(_REENT, fp);
74 result = (fp->_flags2 & __SNLK) ? FSETLOCKING_BYCALLER : FSETLOCKING_INTERNAL;
75 switch (type)
76 {
77 case FSETLOCKING_BYCALLER:
78 fp->_flags2 |= __SNLK;
79 break;
80 case FSETLOCKING_INTERNAL:
81 fp->_flags2 &= ~__SNLK;
82 break;
83 case FSETLOCKING_QUERY:
84 default:
85 break;
86 }
87 return result;
88 }
89
90 #endif /* __rtems__ */
91
